veux: Merge common tree to veux

- Ref:
  https://github.com/xiaomi-sm6375-devs/android_device_xiaomi_sm6375-common

Signed-off-by: kleidione <kleidione@gmail.com>

39 files changed, 14606 insertions, 0 deletions

diff --git a/gps/utils/Android.bp b/gps/utils/Android.bp
new file mode 100644
index 0000000..7d43d57
--- /dev/null
+++ b/gps/utils/Android.bp
@@ -0,0 +1,54 @@
+
+cc_library_shared {
+
+    name: "libgps.utils",
+    vendor: true,
+
+    sanitize: GNSS_SANITIZE,
+
+    //# Libs
+    shared_libs: [
+        "libdl",
+        "libutils",
+        "libcutils",
+        "liblog",
+        "libprocessgroup",
+    ],
+
+    srcs: [
+        "loc_log.cpp",
+        "loc_cfg.cpp",
+        "msg_q.c",
+        "linked_list.c",
+        "loc_target.cpp",
+        "LocHeap.cpp",
+        "LocTimer.cpp",
+        "LocThread.cpp",
+        "MsgTask.cpp",
+        "loc_misc_utils.cpp",
+        "loc_nmea.cpp",
+        "LocIpc.cpp",
+        "LogBuffer.cpp",
+    ],
+
+    cflags: [
+        "-fno-short-enums",
+        "-D_ANDROID_",
+    ] + GNSS_CFLAGS,
+
+    //# Includes
+    ldflags: ["-Wl,--export-dynamic"],
+
+    header_libs: [
+        "libutils_headers",
+        "libloc_pla_headers",
+        "liblocation_api_headers",
+    ],
+}
+
+cc_library_headers {
+
+    name: "libgps.utils_headers",
+    export_include_dirs: ["."],
+    vendor: true,
+}
diff --git a/gps/utils/LocHeap.cpp b/gps/utils/LocHeap.cpp
new file mode 100644
index 0000000..4d047e4
--- /dev/null
+++ b/gps/utils/LocHeap.cpp
@@ -0,0 +1,280 @@
+/* Copyright (c) 2015, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#include <LocHeap.h>
+
+namespace loc_util {
+
+class LocHeapNode {
+    friend class LocHeap;
+
+    // size of of the subtree, excluding self, 1 if no subtree
+    int mSize;
+    LocHeapNode* mLeft;
+    LocHeapNode* mRight;
+    LocRankable* mData;
+public:
+    inline LocHeapNode(LocRankable& data) :
+        mSize(1), mLeft(NULL), mRight(NULL), mData(&data) {}
+    ~LocHeapNode();
+
+    // this only swaps the data of the two nodes, so no
+    // detach / re-attached is necessary
+    void swap(LocHeapNode& node);
+
+    LocRankable* detachData();
+
+    // push a node into the tree stucture, keeping sorted by rank
+    void push(LocHeapNode& node);
+
+    // pop the head node out of the tree stucture. keeping sorted by rank
+    static LocHeapNode* pop(LocHeapNode*& top);
+
+    // remove a specific node from the tree
+    // returns the pointer to the node removed, which would be either the
+    //         same as input (if successfully removed); or NULL (if failed).
+    static LocHeapNode* remove(LocHeapNode*& top, LocRankable& data);
+
+    // convenience method to compare data ranking
+    inline bool outRanks(LocHeapNode& node) { return mData->outRanks(*node.mData); }
+    inline bool outRanks(LocRankable& data) { return mData->outRanks(data); }
+
+    // checks if mSize is correct, AND this node is the highest ranking
+    // of the entire subtree
+    bool checkNodes();
+
+    inline int getSize() { return mSize; }
+};
+
+inline
+LocHeapNode::~LocHeapNode() {
+    if (mLeft) {
+        delete mLeft;
+        mLeft = NULL;
+    }
+    if (mRight) {
+        delete mRight;
+        mRight = NULL;
+    }
+    if (mData) {
+        mData = NULL;
+    }
+}
+
+inline
+void LocHeapNode::swap(LocHeapNode& node) {
+    LocRankable* tmpData = node.mData;
+    node.mData = mData;
+    mData = tmpData;
+}
+
+inline
+LocRankable* LocHeapNode::detachData()  {
+    LocRankable* data = mData;
+    mData = NULL;
+    return data;
+}
+
+// push keeps the tree sorted by rank, it also tries to balance the
+// tree by adding the new node to the smaller of the subtrees.
+// The pointer to the tree and internal links never change. If the
+// mData of tree top ranks lower than that of the incoming node,
+// mData will be swapped with that of the incoming node to ensure
+// ranking, no restructuring the container nodes.
+void LocHeapNode::push(LocHeapNode& node) {
+    // ensure the current node ranks higher than in the incoming one
+    if (node.outRanks(*this)) {
+        swap(node);
+    }
+
+    // now drop the new node (ensured lower than *this) into a subtree
+    if (NULL == mLeft) {
+        mLeft = &node;
+    } else if (NULL == mRight) {
+        mRight = &node;
+    } else if (mLeft->mSize <= mRight->mSize) {
+        mLeft->push(node);
+    } else {
+        mRight->push(node);
+    }
+    mSize++;
+}
+
+// pop keeps the tree sorted by rank, but it does not try to balance
+// the tree. It recursively swaps with the higher ranked top of the
+// subtrees.
+// The return is a popped out node from leaf level, that has the data
+// swapped all the way down from the top. The pinter to the tree and
+// internal links will not be changed or restructured, except for the
+// node that is popped out.
+// If the return pointer == this, this the last node in the tree.
+LocHeapNode* LocHeapNode::pop(LocHeapNode*& top) {
+    // we know the top has the highest ranking at this point, else
+    // the tree is broken. This top will be popped out.  But we need
+    // a node from the left or right child, whichever ranks higher,
+    // to replace the current top. This then will need to be done
+    // recursively to the leaf level. So we swap the mData of the
+    // current top node all the way down to the leaf level.
+    LocHeapNode* poppedNode = top;
+    // top is losing a node in its subtree
+    top->mSize--;
+    if (top->mLeft || top->mRight) {
+        // if mLeft is NULL, mRight for sure is NOT NULL, take that;
+        // else if mRight is NULL, mLeft for sure is NOT, take that;
+        // else we take the address of whatever has higher ranking mData
+        LocHeapNode*& subTop = (NULL == top->mLeft) ? top->mRight :
+            ((NULL == top->mRight) ? top->mLeft :
+             (top->mLeft->outRanks(*(top->mRight)) ? top->mLeft : top->mRight));
+        // swap mData, the tree top gets updated with the new data.
+        top->swap(*subTop);
+        // pop out from the subtree
+        poppedNode = pop(subTop);
+    } else {
+        // if the top has only single node
+        // detach the poppedNode from the tree
+        // subTop is the reference of ether mLeft or mRight
+        // NOT a local stack pointer. so it MUST be NULL'ed here.
+        top = NULL;
+    }
+
+    return poppedNode;
+}
+
+// navigating through the tree and find the node that hass the input
+// data. Since this is a heap, we do recursive linear search.
+// returns the pointer to the node removed, which would be either the
+//         same as input (if successfully removed); or NULL (if failed).
+LocHeapNode* LocHeapNode::remove(LocHeapNode*& top, LocRankable& data) {
+    LocHeapNode* removedNode = NULL;
+    // this is the node, by address
+    if (&data == (LocRankable*)(top->mData)) {
+        // pop this node out
+        removedNode = pop(top);
+    } else if (!data.outRanks(*top->mData)) {
+        // subtrees might have this node
+        if (top->mLeft) {
+            removedNode = remove(top->mLeft, data);
+        }
+        // if we did not find in mLeft, and mRight is not empty
+        if (!removedNode && top->mRight) {
+            removedNode = remove(top->mRight, data);
+        }
+
+        // top lost a node in its subtree
+        if (removedNode) {
+            top->mSize--;
+        }
+    }
+
+    return removedNode;
+}
+
+// checks if mSize is correct, AND this node is the highest ranking
+// of the entire subtree
+bool LocHeapNode::checkNodes() {
+    // size of the current subtree
+    int totalSize = mSize;
+    if (mLeft) {
+        // check the consistency of left subtree
+        if (mLeft->outRanks(*this) || !mLeft->checkNodes()) {
+            return false;
+        }
+        // subtract the size of left subtree (with subtree head)
+        totalSize -= mLeft->mSize;
+    }
+
+    if (mRight) {
+        // check the consistency of right subtree
+        if (mRight->outRanks(*this) || !mRight->checkNodes()) {
+            return false;
+        }
+        // subtract the size of right subtree (with subtree head)
+        totalSize -= mRight->mSize;
+    }
+
+    // for the tree nodes to consistent, totalSize must be 1 now
+    return totalSize == 1;
+}
+
+LocHeap::~LocHeap() {
+    if (mTree) {
+        delete mTree;
+    }
+}
+
+void LocHeap::push(LocRankable& node) {
+    LocHeapNode* heapNode = new LocHeapNode(node);
+    if (!mTree) {
+        mTree = heapNode;
+    } else {
+        mTree->push(*heapNode);
+    }
+}
+
+LocRankable* LocHeap::peek() {
+    LocRankable* top = NULL;
+    if (mTree) {
+        top = mTree->mData;
+    }
+    return top;
+}
+
+LocRankable* LocHeap::pop() {
+    LocRankable* locNode = NULL;
+    if (mTree) {
+        // mTree may become NULL after this call
+        LocHeapNode* heapNode = LocHeapNode::pop(mTree);
+        locNode = heapNode->detachData();
+        delete heapNode;
+    }
+    return locNode;
+}
+
+LocRankable* LocHeap::remove(LocRankable& rankable) {
+    LocRankable* locNode = NULL;
+    if (mTree) {
+        // mTree may become NULL after this call
+        LocHeapNode* heapNode = LocHeapNode::remove(mTree, rankable);
+        if (heapNode) {
+            locNode = heapNode->detachData();
+            delete heapNode;
+        }
+    }
+    return locNode;
+}
+
+} // namespace loc_util
+
+#ifdef __LOC_UNIT_TEST__
+bool LocHeap::checkTree() {
+    return ((NULL == mTree) || mTree->checkNodes());
+}
+uint32_t LocHeap::getTreeSize() {
+    return (NULL == mTree) ? 0 : mTree->getSize();
+}
+#endif
diff --git a/gps/utils/LocHeap.h b/gps/utils/LocHeap.h
new file mode 100644
index 0000000..bb62d6b
--- /dev/null
+++ b/gps/utils/LocHeap.h
@@ -0,0 +1,100 @@
+/* Copyright (c) 2015, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#ifndef __LOC_HEAP__
+#define __LOC_HEAP__
+
+#include <stddef.h>
+#include <string.h>
+
+namespace loc_util {
+
+// abstract class to be implemented by client to provide a rankable class
+class LocRankable {
+public:
+    virtual inline ~LocRankable() {}
+
+    // method to rank objects of such type for sorting purposes.
+    // The pointer of the input node would be stored in the heap.
+    // >0 if ranks higher than the input;
+    // ==0 if equally ranks with the input;
+    // <0 if ranks lower than the input
+    virtual int ranks(LocRankable& rankable) = 0;
+
+    // convenient method to rank objects of such type for sorting purposes.
+    inline bool outRanks(LocRankable& rankable) { return ranks(rankable) > 0; }
+};
+
+// opaque class to provide service implementation.
+class LocHeapNode;
+
+// a heap whose left and right children are not sorted. It is sorted only vertically,
+// i.e. parent always ranks higher than children, if they exist. Ranking algorithm is
+// implemented in Rankable. The reason that there is no sort between children is to
+// help beter balance the tree with lower cost. When a node is pushed to the tree,
+// it is guaranteed that the subtree that is smaller gets to have the new node.
+class LocHeap {
+protected:
+    LocHeapNode* mTree;
+public:
+    inline LocHeap() : mTree(NULL) {}
+    ~LocHeap();
+
+    // push keeps the tree sorted by rank, it also tries to balance the
+    // tree by adding the new node to the smaller of the subtrees.
+    // node is reference to an obj that is managed by client, that client
+    //      creates and destroyes. The destroy should happen after the
+    //      node is popped out from the heap.
+    void push(LocRankable& node);
+
+    // Peeks the node data on tree top, which has currently the highest ranking
+    // There is no change the tree structure with this operation
+    // Returns NULL if the tree is empty, otherwise pointer to the node data of
+    //         the tree top.
+    LocRankable* peek();
+
+    // pop keeps the tree sorted by rank, but it does not try to balance
+    // the tree.
+    // Return - pointer to the node popped out, or NULL if heap is already empty
+    LocRankable* pop();
+
+    // navigating through the tree and find the node that ranks the same
+    // as the input data, then remove it from the tree. Rank is implemented
+    // by rankable obj.
+    // returns the pointer to the node removed; or NULL (if failed).
+    LocRankable* remove(LocRankable& rankable);
+
+#ifdef __LOC_UNIT_TEST__
+    bool checkTree();
+    uint32_t getTreeSize();
+#endif
+};
+
+} // namespace loc_util
+
+#endif //__LOC_HEAP__
diff --git a/gps/utils/LocIpc.cpp b/gps/utils/LocIpc.cpp
new file mode 100644
index 0000000..746ca87
--- /dev/null
+++ b/gps/utils/LocIpc.cpp
@@ -0,0 +1,430 @@
+/* Copyright (c) 2017-2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <loc_misc_utils.h>
+#include <log_util.h>
+#include <LocIpc.h>
+#include <algorithm>
+
+using namespace std;
+
+namespace loc_util {
+
+#ifdef LOG_TAG
+#undef LOG_TAG
+#endif
+#define LOG_TAG "LocSvc_LocIpc"
+
+#define SOCK_OP_AND_LOG(buf, length, opable, rtv, exe)  \
+    if (nullptr == (buf) || 0 == (length)) { \
+        LOC_LOGe("Invalid inputs: buf - %p, length - %u", (buf), (length)); \
+    } else if (!(opable)) {                                             \
+        LOC_LOGe("Invalid object: operable - %d", (opable));            \
+    } else { \
+        rtv = (exe); \
+        if (-1 == rtv) { \
+            LOC_LOGw("failed reason: %s", strerror(errno)); \
+        } \
+    }
+
+const char Sock::MSG_ABORT[] = "LocIpc::Sock::ABORT";
+const char Sock::LOC_IPC_HEAD[] = "$MSGLEN$";
+ssize_t Sock::send(const void *buf, uint32_t len, int flags, const struct sockaddr *destAddr,
+                          socklen_t addrlen) const {
+    ssize_t rtv = -1;
+    SOCK_OP_AND_LOG(buf, len, isValid(), rtv, sendto(buf, len, flags, destAddr, addrlen));
+    return rtv;
+}
+ssize_t Sock::recv(const LocIpcRecver& recver, const shared_ptr<ILocIpcListener>& dataCb, int flags,
+                   struct sockaddr *srcAddr, socklen_t *addrlen, int sid) const {
+    ssize_t rtv = -1;
+    if (-1 == sid) {
+        sid = mSid;
+    } // else it sid would be connection based socket id for recv
+    SOCK_OP_AND_LOG(dataCb.get(), mMaxTxSize, isValid(), rtv,
+                    recvfrom(recver, dataCb, sid, flags, srcAddr, addrlen));
+    return rtv;
+}
+ssize_t Sock::sendto(const void *buf, size_t len, int flags, const struct sockaddr *destAddr,
+                     socklen_t addrlen) const {
+    ssize_t rtv = -1;
+    if (len <= mMaxTxSize) {
+        rtv = ::sendto(mSid, buf, len, flags, destAddr, addrlen);
+    } else {
+        std::string head(LOC_IPC_HEAD + to_string(len));
+        rtv = ::sendto(mSid, head.c_str(), head.length(), flags, destAddr, addrlen);
+        if (rtv > 0) {
+            for (size_t offset = 0; offset < len && rtv > 0; offset += rtv) {
+                rtv = ::sendto(mSid, (char*)buf + offset, min(len - offset, (size_t)mMaxTxSize),
+                               flags, destAddr, addrlen);
+            }
+            rtv = (rtv > 0) ? (head.length() + len) : -1;
+        }
+    }
+    return rtv;
+}
+ssize_t Sock::recvfrom(const LocIpcRecver& recver, const shared_ptr<ILocIpcListener>& dataCb,
+                       int sid, int flags, struct sockaddr *srcAddr, socklen_t *addrlen) const  {
+    std::string msg(mMaxTxSize, 0);
+    ssize_t nBytes = ::recvfrom(sid, (void*)msg.data(), msg.size(), flags, srcAddr, addrlen);
+    if (nBytes > 0) {
+        if (strncmp(msg.data(), MSG_ABORT, sizeof(MSG_ABORT)) == 0) {
+            LOC_LOGi("recvd abort msg.data %s", msg.data());
+            nBytes = 0;
+        } else if (strncmp(msg.data(), LOC_IPC_HEAD, sizeof(LOC_IPC_HEAD) - 1)) {
+            // short message
+            msg.resize(nBytes);
+            dataCb->onReceive(msg.data(), nBytes, &recver);
+        } else {
+            // long message
+            size_t msgLen = 0;
+            sscanf(msg.data() + sizeof(LOC_IPC_HEAD) - 1, "%zu", &msgLen);
+            msg.resize(msgLen);
+            for (size_t msgLenReceived = 0; (msgLenReceived < msgLen) && (nBytes > 0);
+                 msgLenReceived += nBytes) {
+                nBytes = ::recvfrom(sid, &(msg[msgLenReceived]), msg.size() - msgLenReceived,
+                                    flags, srcAddr, addrlen);
+            }
+            if (nBytes > 0) {
+                nBytes = msgLen;
+                dataCb->onReceive(msg.data(), nBytes, &recver);
+            }
+        }
+    }
+
+    return nBytes;
+}
+ssize_t Sock::sendAbort(int flags, const struct sockaddr *destAddr, socklen_t addrlen) {
+    return send(MSG_ABORT, sizeof(MSG_ABORT), flags, destAddr, addrlen);
+}
+
+class LocIpcLocalSender : public LocIpcSender {
+protected:
+    shared_ptr<Sock> mSock;
+    struct sockaddr_un mAddr;
+    inline virtual bool isOperable() const override { return mSock != nullptr && mSock->isValid(); }
+    inline virtual ssize_t send(const uint8_t data[], uint32_t length, int32_t /* msgId */) const {
+        return mSock->send(data, length, 0, (struct sockaddr*)&mAddr, sizeof(mAddr));
+    }
+public:
+    inline LocIpcLocalSender(const char* name) : LocIpcSender(),
+            mSock(nullptr),
+            mAddr({.sun_family = AF_UNIX, {}}) {
+
+        int fd = -1;
+        if (nullptr != name) {
+            fd = ::socket(AF_UNIX, SOCK_DGRAM, 0);
+            if (fd >= 0) {
+                timeval timeout;
+                timeout.tv_sec = 2;
+                timeout.tv_usec = 0;
+                setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
+            }
+        }
+        mSock.reset(new Sock(fd));
+        if (mSock != nullptr && mSock->isValid()) {
+            snprintf(mAddr.sun_path, sizeof(mAddr.sun_path), "%s", name);
+        }
+    }
+};
+
+class LocIpcLocalRecver : public LocIpcLocalSender, public LocIpcRecver {
+protected:
+    inline virtual ssize_t recv() const override {
+        socklen_t size = sizeof(mAddr);
+        return mSock->recv(*this, mDataCb, 0, (struct sockaddr*)&mAddr, &size);
+    }
+public:
+    inline LocIpcLocalRecver(const shared_ptr<ILocIpcListener>& listener, const char* name) :
+            LocIpcLocalSender(name), LocIpcRecver(listener, *this) {
+
+        if ((unlink(mAddr.sun_path) < 0) && (errno != ENOENT)) {
+            LOC_LOGw("unlink socket error. reason:%s", strerror(errno));
+        }
+
+        umask(0157);
+        if (mSock->isValid() && ::bind(mSock->mSid, (struct sockaddr*)&mAddr, sizeof(mAddr)) < 0) {
+            LOC_LOGe("bind socket error. sock fd: %d: %s, reason: %s", mSock->mSid,
+                    mAddr.sun_path, strerror(errno));
+            mSock->close();
+        }
+    }
+    inline virtual ~LocIpcLocalRecver() { unlink(mAddr.sun_path); }
+    inline virtual const char* getName() const override { return mAddr.sun_path; };
+    inline virtual void abort() const override {
+        if (isSendable()) {
+            mSock->sendAbort(0, (struct sockaddr*)&mAddr, sizeof(mAddr));
+        }
+    }
+};
+
+class LocIpcInetSender : public LocIpcSender {
+protected:
+    int mSockType;
+    shared_ptr<Sock> mSock;
+    const string mName;
+    sockaddr_in mAddr;
+    inline virtual bool isOperable() const override { return mSock != nullptr && mSock->isValid(); }
+    virtual ssize_t send(const uint8_t data[], uint32_t length, int32_t /* msgId */) const {
+        return mSock->send(data, length, 0, (struct sockaddr*)&mAddr, sizeof(mAddr));
+    }
+public:
+    inline LocIpcInetSender(const LocIpcInetSender& sender) :
+            mSockType(sender.mSockType), mSock(sender.mSock),
+            mName(sender.mName), mAddr(sender.mAddr) {
+    }
+    inline LocIpcInetSender(const char* name, int32_t port, int sockType) : LocIpcSender(),
+            mSockType(sockType),
+            mSock(make_shared<Sock>((nullptr == name) ? -1 : (::socket(AF_INET, mSockType, 0)))),
+            mName((nullptr == name) ? "" : name),
+            mAddr({.sin_family = AF_INET, .sin_port = htons(port),
+                    .sin_addr = {htonl(INADDR_ANY)}}) {
+        if (mSock != nullptr && mSock->isValid() && nullptr != name) {
+            struct hostent* hp = gethostbyname(name);
+            if (nullptr != hp) {
+                memcpy((char*)&(mAddr.sin_addr.s_addr), hp->h_addr_list[0], hp->h_length);
+            }
+        }
+    }
+
+    unique_ptr<LocIpcRecver> getRecver(const shared_ptr<ILocIpcListener>& listener) override {
+        return make_unique<SockRecver>(listener, *this, mSock);
+    }
+};
+
+class LocIpcInetTcpSender : public LocIpcInetSender {
+protected:
+    mutable bool mFirstTime;
+
+    virtual ssize_t send(const uint8_t data[], uint32_t length, int32_t /* msgId */) const {
+        if (mFirstTime) {
+            mFirstTime = false;
+            ::connect(mSock->mSid, (const struct sockaddr*)&mAddr, sizeof(mAddr));
+        }
+        return mSock->send(data, length, 0, (struct sockaddr*)&mAddr, sizeof(mAddr));
+    }
+
+public:
+    inline LocIpcInetTcpSender(const char* name, int32_t port) :
+            LocIpcInetSender(name, port, SOCK_STREAM),
+            mFirstTime(true) {}
+};
+
+class LocIpcInetRecver : public LocIpcInetSender, public LocIpcRecver {
+     int32_t mPort;
+protected:
+     virtual ssize_t recv() const = 0;
+public:
+    inline LocIpcInetRecver(const shared_ptr<ILocIpcListener>& listener, const char* name,
+                               int32_t port, int sockType) :
+            LocIpcInetSender(name, port, sockType), LocIpcRecver(listener, *this),
+            mPort(port) {
+        if (mSock->isValid() && ::bind(mSock->mSid, (struct sockaddr*)&mAddr, sizeof(mAddr)) < 0) {
+            LOC_LOGe("bind socket error. sock fd: %d, reason: %s", mSock->mSid, strerror(errno));
+            mSock->close();
+        }
+    }
+    inline virtual ~LocIpcInetRecver() {}
+    inline virtual const char* getName() const override { return mName.data(); };
+    inline virtual void abort() const override {
+        if (isSendable()) {
+            sockaddr_in loopBackAddr = {.sin_family = AF_INET, .sin_port = htons(mPort),
+                    .sin_addr = {htonl(INADDR_LOOPBACK)}};
+            mSock->sendAbort(0, (struct sockaddr*)&loopBackAddr, sizeof(loopBackAddr));
+        }
+    }
+    inline virtual unique_ptr<LocIpcSender> getLastSender() const override {
+        return make_unique<LocIpcInetSender>(static_cast<const LocIpcInetSender&>(*this));
+    }
+};
+
+class LocIpcInetTcpRecver : public LocIpcInetRecver {
+    mutable int32_t mConnFd;
+protected:
+    inline virtual ssize_t recv() const override {
+        socklen_t size = sizeof(mAddr);
+        if (-1 == mConnFd && mSock->isValid()) {
+            if (::listen(mSock->mSid, 3) < 0 ||
+                (mConnFd = accept(mSock->mSid, (struct sockaddr*)&mAddr, &size)) < 0) {
+                mSock->close();
+                mConnFd = -1;
+            }
+        }
+        return mSock->recv(*this, mDataCb, 0, (struct sockaddr*)&mAddr, &size, mConnFd);
+    }
+public:
+    inline LocIpcInetTcpRecver(const shared_ptr<ILocIpcListener>& listener, const char* name,
+                               int32_t port) :
+            LocIpcInetRecver(listener, name, port, SOCK_STREAM), mConnFd(-1) {}
+    inline virtual ~LocIpcInetTcpRecver() { if (-1 != mConnFd) ::close(mConnFd);}
+};
+
+class LocIpcInetUdpRecver : public LocIpcInetRecver {
+protected:
+    inline virtual ssize_t recv() const override {
+        socklen_t size = sizeof(mAddr);
+        return mSock->recv(*this, mDataCb, 0, (struct sockaddr*)&mAddr, &size);
+    }
+public:
+    inline LocIpcInetUdpRecver(const shared_ptr<ILocIpcListener>& listener, const char* name,
+                                int32_t port) :
+            LocIpcInetRecver(listener, name, port, SOCK_DGRAM) {}
+
+    inline virtual ~LocIpcInetUdpRecver() {}
+};
+
+class LocIpcRunnable : public LocRunnable {
+    bool mAbortCalled;
+    LocIpc& mLocIpc;
+    unique_ptr<LocIpcRecver> mIpcRecver;
+public:
+    inline LocIpcRunnable(LocIpc& locIpc, unique_ptr<LocIpcRecver>& ipcRecver) :
+            mAbortCalled(false),
+            mLocIpc(locIpc),
+            mIpcRecver(move(ipcRecver)) {}
+    inline virtual bool run() override {
+        if (mIpcRecver != nullptr) {
+            mLocIpc.startBlockingListening(*(mIpcRecver.get()));
+            if (!mAbortCalled) {
+                LOC_LOGw("startListeningBlocking() returned w/o stopBlockingListening() called");
+            }
+        }
+        // return false so the calling thread exits while loop
+        return false;
+    }
+    inline virtual void interrupt() override {
+        mAbortCalled = true;
+        if (mIpcRecver != nullptr) {
+            mIpcRecver->abort();
+        }
+    }
+};
+
+bool LocIpc::startNonBlockingListening(unique_ptr<LocIpcRecver>& ipcRecver) {
+    if (ipcRecver != nullptr && ipcRecver->isRecvable()) {
+        std::string threadName("LocIpc-");
+        threadName.append(ipcRecver->getName());
+        return mThread.start(threadName.c_str(), make_shared<LocIpcRunnable>(*this, ipcRecver));
+    } else {
+        LOC_LOGe("ipcRecver is null OR ipcRecver->recvable() is fasle");
+        return false;
+    }
+}
+
+bool LocIpc::startBlockingListening(LocIpcRecver& ipcRecver) {
+    if (ipcRecver.isRecvable()) {
+        // inform that the socket is ready to receive message
+        ipcRecver.onListenerReady();
+        while (ipcRecver.recvData());
+        return true;
+    } else  {
+        LOC_LOGe("ipcRecver is null OR ipcRecver->recvable() is fasle");
+        return false;
+    }
+}
+
+void LocIpc::stopNonBlockingListening() {
+    mThread.stop();
+}
+
+void LocIpc::stopBlockingListening(LocIpcRecver& ipcRecver) {
+    if (ipcRecver.isRecvable()) {
+        ipcRecver.abort();
+    }
+}
+
+bool LocIpc::send(LocIpcSender& sender, const uint8_t data[], uint32_t length, int32_t msgId) {
+    return sender.sendData(data, length, msgId);
+}
+
+shared_ptr<LocIpcSender> LocIpc::getLocIpcLocalSender(const char* localSockName) {
+    return make_shared<LocIpcLocalSender>(localSockName);
+}
+unique_ptr<LocIpcRecver> LocIpc::getLocIpcLocalRecver(const shared_ptr<ILocIpcListener>& listener,
+                                                      const char* localSockName) {
+    return make_unique<LocIpcLocalRecver>(listener, localSockName);
+}
+static void* sLibQrtrHandle = nullptr;
+static const char* sLibQrtrName = "libloc_socket.so";
+shared_ptr<LocIpcSender> LocIpc::getLocIpcQrtrSender(int service, int instance) {
+    typedef shared_ptr<LocIpcSender> (*creator_t) (int, int);
+    static creator_t creator = (creator_t)dlGetSymFromLib(sLibQrtrHandle, sLibQrtrName,
+            "_ZN8loc_util22createLocIpcQrtrSenderEii");
+    return (nullptr == creator) ? nullptr : creator(service, instance);
+}
+unique_ptr<LocIpcRecver> LocIpc::getLocIpcQrtrRecver(const shared_ptr<ILocIpcListener>& listener,
+                                                     int service, int instance,
+                                                     const shared_ptr<LocIpcQrtrWatcher>& watcher) {
+    typedef unique_ptr<LocIpcRecver> (*creator_t)(const shared_ptr<ILocIpcListener>&, int, int,
+                                                  const shared_ptr<LocIpcQrtrWatcher>& watcher);
+    static creator_t creator = (creator_t)dlGetSymFromLib(sLibQrtrHandle, sLibQrtrName,
+#ifdef USE_GLIB
+            "_ZN8loc_util22createLocIpcQrtrRecverERKSt10shared_ptrINS_15ILocIpcListenerEEiiRKS0_INS_17LocIpcQrtrWatcherEE");
+#else
+            "_ZN8loc_util22createLocIpcQrtrRecverERKNSt3__110shared_ptrINS_15ILocIpcListenerEEEiiRKNS1_INS_17LocIpcQrtrWatcherEEE");
+#endif
+    return (nullptr == creator) ? nullptr : creator(listener, service, instance, watcher);
+}
+shared_ptr<LocIpcSender> LocIpc::getLocIpcInetTcpSender(const char* serverName, int32_t port) {
+    return make_shared<LocIpcInetTcpSender>(serverName, port);
+}
+unique_ptr<LocIpcRecver> LocIpc::getLocIpcInetTcpRecver(const shared_ptr<ILocIpcListener>& listener,
+                                                            const char* serverName, int32_t port) {
+    return make_unique<LocIpcInetTcpRecver>(listener, serverName, port);
+}
+shared_ptr<LocIpcSender> LocIpc::getLocIpcInetUdpSender(const char* serverName, int32_t port) {
+    return make_shared<LocIpcInetSender>(serverName, port, SOCK_DGRAM);
+}
+unique_ptr<LocIpcRecver> LocIpc::getLocIpcInetUdpRecver(const shared_ptr<ILocIpcListener>& listener,
+                                                             const char* serverName, int32_t port) {
+    return make_unique<LocIpcInetUdpRecver>(listener, serverName, port);
+}
+pair<shared_ptr<LocIpcSender>, unique_ptr<LocIpcRecver>>
+        LocIpc::getLocIpcQmiLocServiceSenderRecverPair(const shared_ptr<ILocIpcListener>& listener, int instance) {
+    typedef pair<shared_ptr<LocIpcSender>, unique_ptr<LocIpcRecver>> (*creator_t)(const shared_ptr<ILocIpcListener>&, int);
+    static void* sLibEmuHandle = nullptr;
+    static creator_t creator = (creator_t)dlGetSymFromLib(sLibEmuHandle, "libloc_emu.so",
+#ifdef USE_GLIB
+            "_ZN13QmiLocService41createLocIpcQmiLocServiceSenderRecverPair"\
+            "ERKSt10shared_ptrIN8loc_util15ILocIpcListenerEEi");
+#else
+            "_ZN13QmiLocService41createLocIpcQmiLocServiceSenderRecverPair"\
+            "ERKNSt3__110shared_ptrIN8loc_util15ILocIpcListenerEEEi");
+#endif
+    return (nullptr == creator) ?
+            make_pair<shared_ptr<LocIpcSender>, unique_ptr<LocIpcRecver>>(nullptr, nullptr) :
+            creator(listener, instance);
+}
+
+}
diff --git a/gps/utils/LocIpc.h b/gps/utils/LocIpc.h
new file mode 100644
index 0000000..b2586e6
--- /dev/null
+++ b/gps/utils/LocIpc.h
@@ -0,0 +1,241 @@
+/* Copyright (c) 2017-2018, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __LOC_IPC__
+#define __LOC_IPC__
+
+#include <string>
+#include <memory>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unordered_set>
+#include <mutex>
+#include <LocThread.h>
+
+using namespace std;
+
+namespace loc_util {
+
+class LocIpcRecver;
+class LocIpcSender;
+
+class ILocIpcListener {
+protected:
+    inline virtual ~ILocIpcListener() {}
+public:
+    // LocIpc client can overwrite this function to get notification
+    // when the socket for LocIpc is ready to receive messages.
+    inline virtual void onListenerReady() {}
+    virtual void onReceive(const char* data, uint32_t len, const LocIpcRecver* recver) = 0;
+};
+
+class LocIpcQrtrWatcher {
+    const unordered_set<int> mServicesToWatch;
+    unordered_set<int> mClientsToWatch;
+    mutex mMutex;
+    inline bool isInWatch(const unordered_set<int>& idsToWatch, int id) {
+        return idsToWatch.find(id) != idsToWatch.end();
+    }
+protected:
+    inline virtual ~LocIpcQrtrWatcher() {}
+    inline LocIpcQrtrWatcher(unordered_set<int> servicesToWatch)
+            : mServicesToWatch(servicesToWatch) {}
+public:
+    enum class ServiceStatus { UP, DOWN };
+    inline bool isServiceInWatch(int serviceId) {
+        return isInWatch(mServicesToWatch, serviceId);
+    }
+    inline bool isClientInWatch(int nodeId) {
+        lock_guard<mutex> lock(mMutex);
+        return isInWatch(mClientsToWatch, nodeId);
+    }
+    inline void addClientToWatch(int nodeId) {
+        lock_guard<mutex> lock(mMutex);
+        mClientsToWatch.emplace(nodeId);
+    }
+    virtual void onServiceStatusChange(int sericeId, int instanceId, ServiceStatus status,
+                                       const LocIpcSender& sender) = 0;
+    inline virtual void onClientGone(int nodeId, int portId) {}
+    inline const unordered_set<int>& getServicesToWatch() { return mServicesToWatch; }
+};
+
+class LocIpc {
+public:
+    inline LocIpc() = default;
+    inline virtual ~LocIpc() {
+        stopNonBlockingListening();
+    }
+
+    static shared_ptr<LocIpcSender>
+            getLocIpcLocalSender(const char* localSockName);
+    static shared_ptr<LocIpcSender>
+            getLocIpcInetUdpSender(const char* serverName, int32_t port);
+    static shared_ptr<LocIpcSender>
+            getLocIpcInetTcpSender(const char* serverName, int32_t port);
+    static shared_ptr<LocIpcSender>
+            getLocIpcQrtrSender(int service, int instance);
+
+    static unique_ptr<LocIpcRecver>
+            getLocIpcLocalRecver(const shared_ptr<ILocIpcListener>& listener,
+                                 const char* localSockName);
+    static unique_ptr<LocIpcRecver>
+            getLocIpcInetUdpRecver(const shared_ptr<ILocIpcListener>& listener,
+                                 const char* serverName, int32_t port);
+    static unique_ptr<LocIpcRecver>
+            getLocIpcInetTcpRecver(const shared_ptr<ILocIpcListener>& listener,
+                                   const char* serverName, int32_t port);
+    inline static unique_ptr<LocIpcRecver>
+            getLocIpcQrtrRecver(const shared_ptr<ILocIpcListener>& listener,
+                                int service, int instance) {
+        const shared_ptr<LocIpcQrtrWatcher> qrtrWatcher = nullptr;
+        return getLocIpcQrtrRecver(listener, service, instance, qrtrWatcher);
+    }
+    static unique_ptr<LocIpcRecver>
+            getLocIpcQrtrRecver(const shared_ptr<ILocIpcListener>& listener,
+                                int service, int instance,
+                                const shared_ptr<LocIpcQrtrWatcher>& qrtrWatcher);
+
+    static pair<shared_ptr<LocIpcSender>, unique_ptr<LocIpcRecver>>
+            getLocIpcQmiLocServiceSenderRecverPair(const shared_ptr<ILocIpcListener>& listener,
+                                                   int instance);
+
+    // Listen for new messages in current thread. Calling this funciton will
+    // block current thread.
+    // The listening can be stopped by calling stopBlockingListening() passing
+    // in the same ipcRecver obj handle.
+    static bool startBlockingListening(LocIpcRecver& ipcRecver);
+    static void stopBlockingListening(LocIpcRecver& ipcRecver);
+
+    // Create a new LocThread and listen for new messages in it.
+    // Calling this function will return immediately and won't block current thread.
+    // The listening can be stopped by calling stopNonBlockingListening().
+    bool startNonBlockingListening(unique_ptr<LocIpcRecver>& ipcRecver);
+    void stopNonBlockingListening();
+
+    // Send out a message.
+    // Call this function to send a message in argument data to socket in argument name.
+    //
+    // Argument name contains the name of the target unix socket. data contains the
+    // message to be sent out. Convert your message to a string before calling this function.
+    // The function will return true on success, and false on failure.
+    static bool send(LocIpcSender& sender, const uint8_t data[],
+                     uint32_t length, int32_t msgId = -1);
+
+private:
+    LocThread mThread;
+};
+
+/* this is only when client needs to implement Sender / Recver that are not already provided by
+   the factor methods prvoided by LocIpc. */
+
+class LocIpcSender {
+protected:
+    LocIpcSender() = default;
+    virtual bool isOperable() const = 0;
+    virtual ssize_t send(const uint8_t data[], uint32_t length, int32_t msgId) const = 0;
+public:
+    virtual ~LocIpcSender() = default;
+    inline bool isSendable() const { return isOperable(); }
+    inline bool sendData(const uint8_t data[], uint32_t length, int32_t msgId) const {
+        return isSendable() && (send(data, length, msgId) > 0);
+    }
+    virtual unique_ptr<LocIpcRecver> getRecver(const shared_ptr<ILocIpcListener>& listener) {
+        return nullptr;
+    }
+    inline virtual void copyDestAddrFrom(const LocIpcSender& otherSender) {}
+};
+
+class LocIpcRecver {
+    LocIpcSender& mIpcSender;
+protected:
+    const shared_ptr<ILocIpcListener> mDataCb;
+    inline LocIpcRecver(const shared_ptr<ILocIpcListener>& listener, LocIpcSender& sender) :
+            mIpcSender(sender), mDataCb(listener) {}
+    LocIpcRecver(LocIpcRecver const& recver) = delete;
+    LocIpcRecver& operator=(LocIpcRecver const& recver) = delete;
+    virtual ssize_t recv() const = 0;
+public:
+    virtual ~LocIpcRecver() = default;
+    inline bool recvData() const { return isRecvable() && (recv() > 0); }
+    inline bool isRecvable() const { return mDataCb != nullptr && mIpcSender.isSendable(); }
+    virtual void onListenerReady() { if (mDataCb != nullptr) mDataCb->onListenerReady(); }
+    inline virtual unique_ptr<LocIpcSender> getLastSender() const {
+        return nullptr;
+    }
+    virtual void abort() const = 0;
+    virtual const char* getName() const = 0;
+};
+
+class Sock {
+    static const char MSG_ABORT[];
+    static const char LOC_IPC_HEAD[];
+    const uint32_t mMaxTxSize;
+    ssize_t sendto(const void *buf, size_t len, int flags, const struct sockaddr *destAddr,
+                   socklen_t addrlen) const;
+    ssize_t recvfrom(const LocIpcRecver& recver, const shared_ptr<ILocIpcListener>& dataCb,
+                     int sid, int flags, struct sockaddr *srcAddr, socklen_t *addrlen) const;
+public:
+    int mSid;
+    inline Sock(int sid, const uint32_t maxTxSize = 8192) : mMaxTxSize(maxTxSize), mSid(sid) {}
+    inline ~Sock() { close(); }
+    inline bool isValid() const { return -1 != mSid; }
+    ssize_t send(const void *buf, uint32_t len, int flags, const struct sockaddr *destAddr,
+                 socklen_t addrlen) const;
+    ssize_t recv(const LocIpcRecver& recver, const shared_ptr<ILocIpcListener>& dataCb, int flags,
+                 struct sockaddr *srcAddr, socklen_t *addrlen, int sid = -1) const;
+    ssize_t sendAbort(int flags, const struct sockaddr *destAddr, socklen_t addrlen);
+    inline void close() {
+        if (isValid()) {
+            ::close(mSid);
+            mSid = -1;
+        }
+    }
+};
+
+class SockRecver : public LocIpcRecver {
+    shared_ptr<Sock> mSock;
+protected:
+    inline virtual ssize_t recv() const override {
+        return mSock->recv(*this, mDataCb, 0, nullptr, nullptr);
+    }
+public:
+    inline SockRecver(const shared_ptr<ILocIpcListener>& listener,
+                  LocIpcSender& sender, shared_ptr<Sock> sock) :
+            LocIpcRecver(listener, sender), mSock(sock) {
+    }
+    inline virtual const char* getName() const override {
+        return "SockRecver";
+    }
+    inline virtual void abort() const override {}
+};
+
+}
+
+#endif //__LOC_IPC__
diff --git a/gps/utils/LocLoggerBase.h b/gps/utils/LocLoggerBase.h
new file mode 100644
index 0000000..867b6e2
--- /dev/null
+++ b/gps/utils/LocLoggerBase.h
@@ -0,0 +1,39 @@
+/* Copyright (c) 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#ifndef LOC_LOGGER_BASE_H
+#define LOC_LOGGER_BASE_H
+
+namespace loc_util {
+class LocLoggerBase {
+public:
+    virtual void log() {}
+};
+}
+
+#endif
diff --git a/gps/utils/LocSharedLock.h b/gps/utils/LocSharedLock.h
new file mode 100644
index 0000000..1ef2c57
--- /dev/null
+++ b/gps/utils/LocSharedLock.h
@@ -0,0 +1,81 @@
+/* Copyright (c) 2015, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#ifndef __LOC_SHARED_LOCK__
+#define __LOC_SHARED_LOCK__
+
+#include <stddef.h>
+#ifndef FEATURE_EXTERNAL_AP
+#include <cutils/atomic.h>
+#endif /* FEATURE_EXTERNAL_AP */
+#include <pthread.h>
+
+#ifdef FEATURE_EXTERNAL_AP
+#include <atomic>
+
+inline int32_t android_atomic_inc(volatile int32_t *addr)
+{
+    volatile std::atomic_int_least32_t* a = (volatile std::atomic_int_least32_t*)addr;
+    return std::atomic_fetch_add_explicit(a, 1, std::memory_order_release);
+}
+
+inline int32_t android_atomic_dec(volatile int32_t *addr)
+{
+    volatile std::atomic_int_least32_t* a = (volatile std::atomic_int_least32_t*)addr;
+    return std::atomic_fetch_sub_explicit(a, 1, std::memory_order_release);
+}
+#endif /* FEATURE_EXTERNAL_AP */
+
+namespace loc_util {
+
+// This is a utility created for use cases such that there are more than
+// one client who need to share the same lock, but it is not predictable
+// which of these clients is to last to go away. This shared lock deletes
+// itself when the last client calls its drop() method. To add a cient,
+// this share lock's share() method has to be called, so that the obj
+// can maintain an accurate client count.
+class LocSharedLock {
+    volatile int32_t mRef;
+    pthread_mutex_t mMutex;
+    inline ~LocSharedLock() { pthread_mutex_destroy(&mMutex); }
+public:
+    // first client to create this LockSharedLock
+    inline LocSharedLock() : mRef(1) { pthread_mutex_init(&mMutex, NULL); }
+    // following client(s) are to *share()* this lock created by the first client
+    inline LocSharedLock* share() { android_atomic_inc(&mRef); return this; }
+    // whe a client no longer needs this shared lock, drop() shall be called.
+    inline void drop() { if (1 == android_atomic_dec(&mRef)) delete this; }
+    // locking the lock to enter critical section
+    inline void lock() { pthread_mutex_lock(&mMutex); }
+    // unlocking the lock to leave the critical section
+    inline void unlock() { pthread_mutex_unlock(&mMutex); }
+};
+
+} //namespace loc_util
+
+#endif //__LOC_SHARED_LOCK__
diff --git a/gps/utils/LocThread.cpp b/gps/utils/LocThread.cpp
new file mode 100644
index 0000000..3cac1f9
--- /dev/null
+++ b/gps/utils/LocThread.cpp
@@ -0,0 +1,111 @@
+/* Copyright (c) 2015, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#include <sys/prctl.h>
+#include <LocThread.h>
+#include <string.h>
+#include <string>
+#include <thread>
+#include <loc_pla.h>
+
+using std::weak_ptr;
+using std::shared_ptr;
+using std::thread;
+using std::string;
+
+namespace loc_util {
+
+class LocThreadDelegate {
+    static const char defaultThreadName[];
+    weak_ptr<LocRunnable> mRunnable;
+    thread mThread;
+    LocThreadDelegate(const string tName, shared_ptr<LocRunnable> r);
+public:
+    ~LocThreadDelegate() {
+        shared_ptr<LocRunnable> runnable = mRunnable.lock();
+        if (nullptr != runnable) {
+            runnable->interrupt();
+        }
+    }
+    inline static LocThreadDelegate* create(const char* tName, shared_ptr<LocRunnable> runnable);
+};
+
+const char LocThreadDelegate::defaultThreadName[] = "LocThread";
+
+LocThreadDelegate* LocThreadDelegate::create(const char* tName, shared_ptr<LocRunnable> runnable) {
+    LocThreadDelegate* threadDelegate = nullptr;
+
+    if (nullptr != runnable) {
+        if (!tName) {
+            tName = defaultThreadName;
+        }
+
+        char lname[16];
+        auto nameSize = strlen(tName) + 1;
+        int len = std::min(sizeof(lname), nameSize) - 1;
+        memcpy(lname, tName, len);
+        lname[len] = 0;
+
+        threadDelegate = new LocThreadDelegate(lname, runnable);
+    }
+
+    return threadDelegate;
+}
+
+LocThreadDelegate::LocThreadDelegate(const string tName, shared_ptr<LocRunnable> runnable) :
+        mRunnable(runnable),
+        mThread([tName, runnable] {
+                prctl(PR_SET_NAME, tName.c_str(), 0, 0, 0);
+                runnable->prerun();
+                while (runnable->run());
+                runnable->postrun();
+            }) {
+
+    mThread.detach();
+}
+
+
+
+bool LocThread::start(const char* tName, shared_ptr<LocRunnable> runnable) {
+    bool success = false;
+    if (!mThread) {
+        mThread = LocThreadDelegate::create(tName, runnable);
+        // true only if thread is created successfully
+        success = (NULL != mThread);
+    }
+    return success;
+}
+
+void LocThread::stop() {
+    if (nullptr != mThread) {
+        delete mThread;
+        mThread = nullptr;
+    }
+}
+
+} // loc_util
diff --git a/gps/utils/LocThread.h b/gps/utils/LocThread.h
new file mode 100644
index 0000000..c7ece87
--- /dev/null
+++ b/gps/utils/LocThread.h
@@ -0,0 +1,95 @@
+/* Copyright (c) 2015, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#ifndef __LOC_THREAD__
+#define __LOC_THREAD__
+
+#include <stddef.h>
+#include <memory>
+
+using std::shared_ptr;
+
+namespace loc_util {
+
+// abstract class to be implemented by client to provide a runnable class
+// which gets scheduled by LocThread
+class LocRunnable {
+public:
+    inline LocRunnable() = default;
+    inline virtual ~LocRunnable() = default;
+
+    // The method to be implemented by thread clients
+    // and be scheduled by LocThread
+    // This method will be repeated called until it returns false; or
+    // until thread is stopped.
+    virtual bool run() = 0;
+
+    // The method to be run before thread loop (conditionally repeatedly)
+    // calls run()
+    inline virtual void prerun() {}
+
+    // The method to be run after thread loop (conditionally repeatedly)
+    // calls run()
+    inline virtual void postrun() {}
+
+    // The method to wake up the potential blocking thread
+    // no op if not applicable
+    inline virtual void interrupt() = 0;
+};
+
+// opaque class to provide service implementation.
+class LocThreadDelegate;
+
+// A utility class to create a thread and run LocRunnable
+// caller passes in.
+class LocThread {
+    LocThreadDelegate* mThread;
+public:
+    inline LocThread() : mThread(NULL) {}
+    inline virtual ~LocThread() { stop(); }
+
+    // client starts thread with a runnable, which implements
+    // the logics to fun in the created thread context.
+    // The thread is always detached.
+    // runnable is an obj managed by client. Client creates and
+    //          frees it (but must be after stop() is called, or
+    //          this LocThread obj is deleted).
+    //          The obj will be deleted by LocThread if start()
+    //          returns true. Else it is client's responsibility
+    //          to delete the object
+    // Returns 0 if success; false if failure.
+    bool start(const char* threadName, shared_ptr<LocRunnable> runnable);
+
+    void stop();
+
+    // thread status check
+    inline bool isRunning() { return NULL != mThread; }
+};
+
+} // loc_util
+#endif //__LOC_THREAD__
diff --git a/gps/utils/LocTimer.cpp b/gps/utils/LocTimer.cpp
new file mode 100644
index 0000000..915cf54
--- /dev/null
+++ b/gps/utils/LocTimer.cpp
@@ -0,0 +1,648 @@
+/* Copyright (c) 2015, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <errno.h>
+#include <sys/timerfd.h>
+#include <sys/epoll.h>
+#include <log_util.h>
+#include <loc_timer.h>
+#include <LocTimer.h>
+#include <LocHeap.h>
+#include <LocThread.h>
+#include <LocSharedLock.h>
+#include <MsgTask.h>
+
+#ifdef __HOST_UNIT_TEST__
+#define EPOLLWAKEUP 0
+#define CLOCK_BOOTTIME CLOCK_MONOTONIC
+#define CLOCK_BOOTTIME_ALARM CLOCK_MONOTONIC
+#endif
+
+namespace loc_util {
+
+/*
+There are implementations of 5 classes in this file:
+LocTimer, LocTimerDelegate, LocTimerContainer, LocTimerPollTask, LocTimerWrapper
+
+LocTimer - client front end, interface for client to start / stop timers, also
+           to provide a callback.
+LocTimerDelegate - an internal timer entity, which also is a LocRankable obj.
+                   Its life cycle is different than that of LocTimer. It gets
+                   created when LocTimer::start() is called, and gets deleted
+                   when it expires or clients calls the hosting LocTimer obj's
+                   stop() method. When a LocTimerDelegate obj is ticking, it
+                   stays in the corresponding LocTimerContainer. When expired
+                   or stopped, the obj is removed from the container. Since it
+                   is also a LocRankable obj, and LocTimerContainer also is a
+                   heap, its ranks() implementation decides where it is placed
+                   in the heap.
+LocTimerContainer - core of the timer service. It is a container (derived from
+                    LocHeap) for LocTimerDelegate (implements LocRankable) objs.
+                    There are 2 of such containers, one for sw timers (or Linux
+                    timers) one for hw timers (or Linux alarms). It adds one of
+                    each (those that expire the soonest) to kernel via services
+                    provided by LocTimerPollTask. All the heap management on the
+                    LocTimerDelegate objs are done in the MsgTask context, such
+                    that synchronization is ensured.
+LocTimerPollTask - is a class that wraps timerfd and epoll POXIS APIs. It also
+                   both implements LocRunnalbe with epoll_wait() in the run()
+                   method. It is also a LocThread client, so as to loop the run
+                   method.
+LocTimerWrapper - a LocTimer client itself, to implement the existing C API with
+                  APIs, loc_timer_start() and loc_timer_stop().
+
+*/
+
+class LocTimerPollTask;
+
+// This is a multi-functaional class that:
+// * extends the LocHeap class for the detection of head update upon add / remove
+//   events. When that happens, soonest time out changes, so timerfd needs update.
+// * contains the timers, and add / remove them into the heap
+// * provides and maps 2 of such containers, one for timers (or  mSwTimers), one
+//   for alarms (or mHwTimers);
+// * provides a polling thread;
+// * provides a MsgTask thread for synchronized add / remove / timer client callback.
+class LocTimerContainer : public LocHeap {
+    // mutex to synchronize getters of static members
+    static pthread_mutex_t mMutex;
+    // Container of timers
+    static LocTimerContainer* mSwTimers;
+    // Container of alarms
+    static LocTimerContainer* mHwTimers;
+    // Msg task to provider msg Q, sender and reader.
+    static MsgTask* mMsgTask;
+    // Poll task to provide epoll call and threading to poll.
+    static LocTimerPollTask* mPollTask;
+    // timer / alarm fd
+    int mDevFd;
+    // ctor
+    LocTimerContainer(bool wakeOnExpire);
+    // dtor
+    ~LocTimerContainer();
+    static MsgTask* getMsgTaskLocked();
+    static LocTimerPollTask* getPollTaskLocked();
+    // extend LocHeap and pop if the top outRanks input
+    LocTimerDelegate* popIfOutRanks(LocTimerDelegate& timer);
+    // update the timer POSIX calls with updated soonest timer spec
+    void updateSoonestTime(LocTimerDelegate* priorTop);
+
+public:
+    // factory method to control the creation of mSwTimers / mHwTimers
+    static LocTimerContainer* get(bool wakeOnExpire);
+
+    LocTimerDelegate* getSoonestTimer();
+    int getTimerFd();
+    // add a timer / alarm obj into the container
+    void add(LocTimerDelegate& timer);
+    // remove a timer / alarm obj from the container
+    void remove(LocTimerDelegate& timer);
+    // handling of timer / alarm expiration
+    void expire();
+};
+
+class TimerRunnable : public LocRunnable {
+    const int mFd;
+public:
+    inline TimerRunnable(const int fd) : mFd(fd) {}
+    // The method to be implemented by thread clients
+    // and be scheduled by LocThread
+    // This method will be repeated called until it returns false; or
+    // until thread is stopped.
+    virtual bool run() override;
+
+    // The method to wake up the potential blocking thread
+    // no op if not applicable
+    inline virtual void interrupt() { close(mFd); }
+};
+
+// This class implements the polling thread that epolls imer / alarm fds.
+// The LocRunnable::run() contains the actual polling.  The other methods
+// will be run in the caller's thread context to add / remove timer / alarm
+// fds the kernel, while the polling is blocked on epoll_wait() call.
+// Since the design is that we have maximally 2 polls, one for all the
+// timers; one for all the alarms, we will poll at most on 2 fds.  But it
+// is possile that all we have are only timers or alarms at one time, so we
+// allow dynamically add / remove fds we poll on. The design decision of
+// having 1 fd per container of timer / alarm is such that, we may not need
+// to make a system call each time a timer / alarm is added / removed, unless
+// that changes the "soonest" time out of that of all the timers / alarms.
+class LocTimerPollTask {
+    // the epoll fd
+    const int mFd;
+    // the thread that calls TimerRunnable::run() method, where
+    // epoll_wait() is blocking and waiting for events..
+    LocThread mThread;
+public:
+    // ctor
+    LocTimerPollTask();
+    // dtor
+    ~LocTimerPollTask() = default;
+    // add a container of timers. Each contain has a unique device fd, i.e.
+    // either timer or alarm fd, and a heap of timers / alarms. It is expected
+    // that container would have written to the device fd with the soonest
+    // time out value in the heap at the time of calling this method. So all
+    // this method does is to add the fd of the input container to the poll
+    // and also add the pointer of the container to the event data ptr, such
+    // when poll_wait wakes up on events, we know who is the owner of the fd.
+    void addPoll(LocTimerContainer& timerContainer);
+    // remove a fd that is assciated with a container. The expectation is that
+    // the atual timer would have been removed from the container.
+    void removePoll(LocTimerContainer& timerContainer);
+};
+
+// Internal class of timer obj. It gets born when client calls LocTimer::start();
+// and gets deleted when client calls LocTimer::stop() or when the it expire()'s.
+// This class implements LocRankable::ranks() so that when an obj is added into
+// the container (of LocHeap), it gets placed in sorted order.
+class LocTimerDelegate : public LocRankable {
+    friend class LocTimerContainer;
+    friend class LocTimer;
+    LocTimer* mClient;
+    LocSharedLock* mLock;
+    struct timespec mFutureTime;
+    LocTimerContainer* mContainer;
+    // not a complete obj, just ctor for LocRankable comparisons
+    inline LocTimerDelegate(struct timespec& delay)
+        : mClient(NULL), mLock(NULL), mFutureTime(delay), mContainer(NULL) {}
+    inline ~LocTimerDelegate() { if (mLock) { mLock->drop(); mLock = NULL; } }
+public:
+    LocTimerDelegate(LocTimer& client, struct timespec& futureTime, LocTimerContainer* container);
+    void destroyLocked();
+    // LocRankable virtual method
+    virtual int ranks(LocRankable& rankable);
+    void expire();
+    inline struct timespec getFutureTime() { return mFutureTime; }
+};
+
+/***************************LocTimerContainer methods***************************/
+
+// Most of these static recources are created on demand. They however are never
+// destoyed. The theory is that there are processes that link to this util lib
+// but never use timer, then these resources would never need to be created.
+// For those processes that do use timer, it will likely also need to every
+// once in a while. It might be cheaper keeping them around.
+pthread_mutex_t LocTimerContainer::mMutex = PTHREAD_MUTEX_INITIALIZER;
+LocTimerContainer* LocTimerContainer::mSwTimers = NULL;
+LocTimerContainer* LocTimerContainer::mHwTimers = NULL;
+MsgTask* LocTimerContainer::mMsgTask = NULL;
+LocTimerPollTask* LocTimerContainer::mPollTask = NULL;
+
+// ctor - initialize timer heaps
+// A container for swTimer (timer) is created, when wakeOnExpire is true; or
+// HwTimer (alarm), when wakeOnExpire is false.
+LocTimerContainer::LocTimerContainer(bool wakeOnExpire) :
+    mDevFd(timerfd_create(wakeOnExpire ? CLOCK_BOOTTIME_ALARM : CLOCK_BOOTTIME, 0)) {
+
+    if ((-1 == mDevFd) && (errno == EINVAL)) {
+        LOC_LOGW("%s: timerfd_create failure, fallback to CLOCK_MONOTONIC - %s",
+            __FUNCTION__, strerror(errno));
+        mDevFd = timerfd_create(CLOCK_MONOTONIC, 0);
+    }
+
+    if (-1 != mDevFd) {
+        // ensure we have the necessary resources created
+        LocTimerContainer::getPollTaskLocked();
+        LocTimerContainer::getMsgTaskLocked();
+    } else {
+        LOC_LOGE("%s: timerfd_create failure - %s", __FUNCTION__, strerror(errno));
+    }
+}
+
+// dtor
+// we do not ever destroy the static resources.
+inline
+LocTimerContainer::~LocTimerContainer() {
+    close(mDevFd);
+}
+
+LocTimerContainer* LocTimerContainer::get(bool wakeOnExpire) {
+    // get the reference of either mHwTimer or mSwTimers per wakeOnExpire
+    LocTimerContainer*& container = wakeOnExpire ? mHwTimers : mSwTimers;
+    // it is cheap to check pointer first than locking mutext unconditionally
+    if (!container) {
+        pthread_mutex_lock(&mMutex);
+        // let's check one more time to be safe
+        if (!container) {
+            container = new LocTimerContainer(wakeOnExpire);
+            // timerfd_create failure
+            if (-1 == container->getTimerFd()) {
+                delete container;
+                container = NULL;
+            }
+        }
+        pthread_mutex_unlock(&mMutex);
+    }
+    return container;
+}
+
+MsgTask* LocTimerContainer::getMsgTaskLocked() {
+    // it is cheap to check pointer first than locking mutext unconditionally
+    if (!mMsgTask) {
+        mMsgTask = new MsgTask("LocTimerMsgTask");
+    }
+    return mMsgTask;
+}
+
+LocTimerPollTask* LocTimerContainer::getPollTaskLocked() {
+    // it is cheap to check pointer first than locking mutext unconditionally
+    if (!mPollTask) {
+        mPollTask = new LocTimerPollTask();
+    }
+    return mPollTask;
+}
+
+inline
+LocTimerDelegate* LocTimerContainer::getSoonestTimer() {
+    return (LocTimerDelegate*)(peek());
+}
+
+inline
+int LocTimerContainer::getTimerFd() {
+    return mDevFd;
+}
+
+void LocTimerContainer::updateSoonestTime(LocTimerDelegate* priorTop) {
+    LocTimerDelegate* curTop = getSoonestTimer();
+
+    // check if top has changed
+    if (curTop != priorTop) {
+        struct itimerspec delay;
+        memset(&delay, 0, sizeof(struct itimerspec));
+        bool toSetTime = false;
+        // if tree is empty now, we remove poll and disarm timer
+        if (!curTop) {
+            mPollTask->removePoll(*this);
+            // setting the values to disarm timer
+            delay.it_value.tv_sec = 0;
+            delay.it_value.tv_nsec = 0;
+            toSetTime = true;
+        } else if (!priorTop || curTop->outRanks(*priorTop)) {
+            // do this first to avoid race condition, in case settime is called
+            // with too small an interval
+            mPollTask->addPoll(*this);
+            delay.it_value = curTop->getFutureTime();
+            toSetTime = true;
+        }
+        if (toSetTime) {
+            timerfd_settime(getTimerFd(), TFD_TIMER_ABSTIME, &delay, NULL);
+        }
+    }
+}
+
+// all the heap management is done in the MsgTask context.
+inline
+void LocTimerContainer::add(LocTimerDelegate& timer) {
+    struct MsgTimerPush : public LocMsg {
+        LocTimerContainer* mTimerContainer;
+        LocTimerDelegate* mTimer;
+        inline MsgTimerPush(LocTimerContainer& container, LocTimerDelegate& timer) :
+            LocMsg(), mTimerContainer(&container), mTimer(&timer) {}
+        inline virtual void proc() const {
+            LocTimerDelegate* priorTop = mTimerContainer->getSoonestTimer();
+            mTimerContainer->push((LocRankable&)(*mTimer));
+            mTimerContainer->updateSoonestTime(priorTop);
+        }
+    };
+
+    mMsgTask->sendMsg(new MsgTimerPush(*this, timer));
+}
+
+// all the heap management is done in the MsgTask context.
+void LocTimerContainer::remove(LocTimerDelegate& timer) {
+    struct MsgTimerRemove : public LocMsg {
+        LocTimerContainer* mTimerContainer;
+        LocTimerDelegate* mTimer;
+        inline MsgTimerRemove(LocTimerContainer& container, LocTimerDelegate& timer) :
+            LocMsg(), mTimerContainer(&container), mTimer(&timer) {}
+        inline virtual void proc() const {
+            LocTimerDelegate* priorTop = mTimerContainer->getSoonestTimer();
+
+            // update soonest timer only if mTimer is actually removed from
+            // mTimerContainer AND mTimer is not priorTop.
+            if (priorTop == ((LocHeap*)mTimerContainer)->remove((LocRankable&)*mTimer)) {
+                // if passing in NULL, we tell updateSoonestTime to update
+                // kernel with the current top timer interval.
+                mTimerContainer->updateSoonestTime(NULL);
+            }
+            // all timers are deleted here, and only here.
+            delete mTimer;
+        }
+    };
+
+    mMsgTask->sendMsg(new MsgTimerRemove(*this, timer));
+}
+
+// all the heap management is done in the MsgTask context.
+// Upon expire, we check and continuously pop the heap until
+// the top node's timeout is in the future.
+void LocTimerContainer::expire() {
+    struct MsgTimerExpire : public LocMsg {
+        LocTimerContainer* mTimerContainer;
+        inline MsgTimerExpire(LocTimerContainer& container) :
+            LocMsg(), mTimerContainer(&container) {}
+        inline virtual void proc() const {
+            struct timespec now;
+            // get time spec of now
+            clock_gettime(CLOCK_BOOTTIME, &now);
+            LocTimerDelegate timerOfNow(now);
+            // pop everything in the heap that outRanks now, i.e. has time older than now
+            // and then call expire() on that timer.
+            for (LocTimerDelegate* timer = (LocTimerDelegate*)mTimerContainer->pop();
+                 NULL != timer;
+                 timer = mTimerContainer->popIfOutRanks(timerOfNow)) {
+                // the timer delegate obj will be deleted before the return of this call
+                timer->expire();
+            }
+            mTimerContainer->updateSoonestTime(NULL);
+        }
+    };
+
+    struct itimerspec delay;
+    memset(&delay, 0, sizeof(struct itimerspec));
+    timerfd_settime(getTimerFd(), TFD_TIMER_ABSTIME, &delay, NULL);
+    mPollTask->removePoll(*this);
+    mMsgTask->sendMsg(new MsgTimerExpire(*this));
+}
+
+LocTimerDelegate* LocTimerContainer::popIfOutRanks(LocTimerDelegate& timer) {
+    LocTimerDelegate* poppedNode = NULL;
+    if (mTree && !timer.outRanks(*peek())) {
+        poppedNode = (LocTimerDelegate*)(pop());
+    }
+
+    return poppedNode;
+}
+
+
+/***************************LocTimerPollTask methods***************************/
+
+inline
+LocTimerPollTask::LocTimerPollTask()
+    : mFd(epoll_create(2)), mThread() {
+    // before a next call returens, a thread will be created. The run() method
+    // could already be running in parallel. Also, since each of the objs
+    // creates a thread, the container will make sure that there will be only
+    // one of such obj for our timer implementation.
+    mThread.start("LocTimerPollTask", std::make_shared<TimerRunnable>(mFd));
+}
+
+void LocTimerPollTask::addPoll(LocTimerContainer& timerContainer) {
+    struct epoll_event ev;
+    memset(&ev, 0, sizeof(ev));
+
+    ev.events = EPOLLIN;
+    ev.data.fd = timerContainer.getTimerFd();
+    // it is important that we set this context pointer with the input
+    // timer container this is how we know which container should handle
+    // which expiration.
+    ev.data.ptr = &timerContainer;
+
+    epoll_ctl(mFd, EPOLL_CTL_ADD, timerContainer.getTimerFd(), &ev);
+}
+
+inline
+void LocTimerPollTask::removePoll(LocTimerContainer& timerContainer) {
+    epoll_ctl(mFd, EPOLL_CTL_DEL, timerContainer.getTimerFd(), NULL);
+}
+
+// The polling thread context will call this method. If run() method needs to
+// be repetitvely called, it must return true from the previous call.
+bool TimerRunnable::run() {
+    struct epoll_event ev[2];
+
+    // we have max 2 descriptors to poll from
+    int fds = epoll_wait(mFd, ev, 2, -1);
+
+    // we pretty much want to continually poll until the fd is closed
+    bool rerun = (fds > 0) || (errno == EINTR);
+
+    if (fds > 0) {
+        // we may have 2 events
+        for (int i = 0; i < fds; i++) {
+            // each fd has a context pointer associated with the right timer container
+            LocTimerContainer* container = (LocTimerContainer*)(ev[i].data.ptr);
+            if (container) {
+                container->expire();
+            } else {
+                epoll_ctl(mFd, EPOLL_CTL_DEL, ev[i].data.fd, NULL);
+            }
+        }
+    }
+
+    // if rerun is true, we are requesting to be scheduled again
+    return rerun;
+}
+
+/***************************LocTimerDelegate methods***************************/
+
+inline
+LocTimerDelegate::LocTimerDelegate(LocTimer& client,
+                                   struct timespec& futureTime,
+                                   LocTimerContainer* container)
+    : mClient(&client),
+      mLock(mClient->mLock->share()),
+      mFutureTime(futureTime),
+      mContainer(container) {
+    // adding the timer into the container
+    mContainer->add(*this);
+}
+
+inline
+void LocTimerDelegate::destroyLocked() {
+    // client handle will likely be deleted soon after this
+    // method returns. Nulling this handle so that expire()
+    // won't call the callback on the dead handle any more.
+    mClient = NULL;
+
+    if (mContainer) {
+        LocTimerContainer* container = mContainer;
+        mContainer = NULL;
+        if (container) {
+            container->remove(*this);
+        }
+    } // else we do not do anything. No such *this* can be
+      // created and reached here with mContainer ever been
+      // a non NULL. So *this* must have reached the if clause
+      // once, and we want it reach there only once.
+}
+
+int LocTimerDelegate::ranks(LocRankable& rankable) {
+    int rank = -1;
+    LocTimerDelegate* timer = (LocTimerDelegate*)(&rankable);
+    if (timer) {
+        // larger time ranks lower!!!
+        // IOW, if input obj has bigger tv_sec/tv_nsec, this obj outRanks higher
+        rank = timer->mFutureTime.tv_sec - mFutureTime.tv_sec;
+        if(0 == rank)
+        {
+            //rank against tv_nsec for msec accuracy
+            rank = (int)(timer->mFutureTime.tv_nsec - mFutureTime.tv_nsec);
+        }
+    }
+    return rank;
+}
+
+inline
+void LocTimerDelegate::expire() {
+    // keeping a copy of client pointer to be safe
+    // when timeOutCallback() is called at the end of this
+    // method, *this* obj may be already deleted.
+    LocTimer* client = mClient;
+    // force a stop, which will lead to delete of this obj
+    if (client && client->stop()) {
+        // calling client callback with a pointer save on the stack
+        // only if stop() returns true, i.e. it hasn't been stopped
+        // already.
+        client->timeOutCallback();
+    }
+}
+
+
+/***************************LocTimer methods***************************/
+LocTimer::LocTimer() : mTimer(NULL), mLock(new LocSharedLock()) {
+}
+
+LocTimer::~LocTimer() {
+    stop();
+    if (mLock) {
+        mLock->drop();
+        mLock = NULL;
+    }
+}
+
+bool LocTimer::start(unsigned int timeOutInMs, bool wakeOnExpire) {
+    bool success = false;
+    mLock->lock();
+    if (!mTimer) {
+        struct timespec futureTime;
+        clock_gettime(CLOCK_BOOTTIME, &futureTime);
+        futureTime.tv_sec += timeOutInMs / 1000;
+        futureTime.tv_nsec += (timeOutInMs % 1000) * 1000000;
+        if (futureTime.tv_nsec >= 1000000000) {
+            futureTime.tv_sec += futureTime.tv_nsec / 1000000000;
+            futureTime.tv_nsec %= 1000000000;
+        }
+
+        LocTimerContainer* container;
+        container = LocTimerContainer::get(wakeOnExpire);
+        if (NULL != container) {
+            mTimer = new LocTimerDelegate(*this, futureTime, container);
+            // if mTimer is non 0, success should be 0; or vice versa
+        }
+        success = (NULL != mTimer);
+    }
+    mLock->unlock();
+    return success;
+}
+
+bool LocTimer::stop() {
+    bool success = false;
+    mLock->lock();
+    if (mTimer) {
+        LocTimerDelegate* timer = mTimer;
+        mTimer = NULL;
+        if (timer) {
+            timer->destroyLocked();
+            success = true;
+        }
+    }
+    mLock->unlock();
+    return success;
+}
+
+/***************************LocTimerWrapper methods***************************/
+//////////////////////////////////////////////////////////////////////////
+// This section below wraps for the C style APIs
+//////////////////////////////////////////////////////////////////////////
+class LocTimerWrapper : public LocTimer {
+    loc_timer_callback mCb;
+    void* mCallerData;
+    LocTimerWrapper* mMe;
+    static pthread_mutex_t mMutex;
+    inline ~LocTimerWrapper() { mCb = NULL; mMe = NULL; }
+public:
+    inline LocTimerWrapper(loc_timer_callback cb, void* callerData) :
+        mCb(cb), mCallerData(callerData), mMe(this) {
+    }
+    void destroy() {
+        pthread_mutex_lock(&mMutex);
+        if (NULL != mCb && this == mMe) {
+            delete this;
+        }
+        pthread_mutex_unlock(&mMutex);
+    }
+    virtual void timeOutCallback() {
+        loc_timer_callback cb = mCb;
+        void* callerData = mCallerData;
+        if (cb) {
+            cb(callerData, 0);
+        }
+        destroy();
+    }
+};
+
+} // namespace loc_util
+
+//////////////////////////////////////////////////////////////////////////
+// This section below wraps for the C style APIs
+//////////////////////////////////////////////////////////////////////////
+
+using loc_util::LocTimerWrapper;
+
+pthread_mutex_t LocTimerWrapper::mMutex = PTHREAD_MUTEX_INITIALIZER;
+
+void* loc_timer_start(uint64_t msec, loc_timer_callback cb_func,
+                      void *caller_data, bool wake_on_expire)
+{
+    LocTimerWrapper* locTimerWrapper = NULL;
+
+    if (cb_func) {
+        locTimerWrapper = new LocTimerWrapper(cb_func, caller_data);
+
+        if (locTimerWrapper) {
+            locTimerWrapper->start(msec, wake_on_expire);
+        }
+    }
+
+    return locTimerWrapper;
+}
+
+void loc_timer_stop(void*&  handle)
+{
+    if (handle) {
+        LocTimerWrapper* locTimerWrapper = (LocTimerWrapper*)(handle);
+        locTimerWrapper->destroy();
+        handle = NULL;
+    }
+}
diff --git a/gps/utils/LocTimer.h b/gps/utils/LocTimer.h
new file mode 100644
index 0000000..c883de2
--- /dev/null
+++ b/gps/utils/LocTimer.h
@@ -0,0 +1,78 @@
+/* Copyright (c) 2015, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __LOC_TIMER_CPP_H__
+#define __LOC_TIMER_CPP_H__
+
+#include <stddef.h>
+#include <loc_pla.h>
+
+namespace loc_util {
+
+// opaque class to provide service implementation.
+class LocTimerDelegate;
+class LocSharedLock;
+
+// LocTimer client must extend this class and implementthe callback.
+// start() / stop() methods are to arm / disarm timer.
+class LocTimer
+{
+    LocTimerDelegate* mTimer;
+    LocSharedLock* mLock;
+    // don't really want mLock to be manipulated by clients, yet LocTimer
+    // has to have a reference to the lock so that the delete of LocTimer
+    // and LocTimerDelegate can work together on their share resources.
+    friend class LocTimerDelegate;
+
+public:
+    LocTimer();
+    virtual ~LocTimer();
+
+    // timeOutInMs:  timeout delay in ms
+    // wakeOnExpire: true if to wake up CPU (if sleeping) upon timer
+    //                        expiration and notify the client.
+    //               false if to wait until next time CPU wakes up (if
+    //                        sleeping) and then notify the client.
+    // return:       true on success;
+    //               false on failure, e.g. timer is already running.
+    bool start(uint32_t timeOutInMs, bool wakeOnExpire);
+
+    // return:       true on success;
+    //               false on failure, e.g. timer is not running.
+    bool stop();
+
+    //  LocTimer client Should implement this method.
+    //  This method is used for timeout calling back to client. This method
+    //  should be short enough (eg: send a message to your own thread).
+    virtual void timeOutCallback() = 0;
+};
+
+} // namespace loc_util
+
+#endif //__LOC_DELAY_H__
diff --git a/gps/utils/LocUnorderedSetMap.h b/gps/utils/LocUnorderedSetMap.h
new file mode 100644
index 0000000..7b25ad0
--- /dev/null
+++ b/gps/utils/LocUnorderedSetMap.h
@@ -0,0 +1,201 @@
+/* Copyright (c) 2015, 2017, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#ifndef __LOC_UNORDERDED_SETMAP_H__
+#define __LOC_UNORDERDED_SETMAP_H__
+
+#include <algorithm>
+#include <loc_pla.h>
+
+#ifdef NO_UNORDERED_SET_OR_MAP
+    #include <set>
+    #include <map>
+#else
+    #include <unordered_set>
+    #include <unordered_map>
+#endif
+
+using std::unordered_set;
+using std::unordered_map;
+
+namespace loc_util {
+
+// Trim from *fromSet* any elements that also exist in *rVals*.
+// The optional *goneVals*, if not null, will be populated with removed elements.
+template <typename T>
+inline static void trimSet(unordered_set<T>& fromSet, const unordered_set<T>& rVals,
+                           unordered_set<T>* goneVals) {
+    for (auto val : rVals) {
+        if (fromSet.erase(val) > 0 && nullptr != goneVals) {
+            goneVals->insert(val);
+        }
+    }
+}
+
+// this method is destructive to the input unordered_sets.
+// the return set is the interset extracted out from the two input sets, *s1* and *s2*.
+// *s1* and *s2* will be left with the intersect removed from them.
+template <typename T>
+static unordered_set<T> removeAndReturnInterset(unordered_set<T>& s1, unordered_set<T>& s2) {
+    unordered_set<T> common = {};
+    for (auto b = s2.begin(); b != s2.end(); b++) {
+        auto a = find(s1.begin(), s1.end(), *b);
+        if (a != s1.end()) {
+            // this is a common item of both l1 and l2, remove from both
+            // but after we add to common
+            common.insert(*a);
+            s1.erase(a);
+            s2.erase(b);
+        }
+    }
+    return common;
+}
+
+template <typename KEY, typename VAL>
+class LocUnorderedSetMap {
+    unordered_map<KEY, unordered_set<VAL>> mMap;
+
+    // Trim the VALs pointed to by *iter*, with everything that also exist in *rVals*.
+    // If the set becomes empty, remove the map entry. *goneVals*, if not null, records
+    // the trimmed VALs.
+    bool trimOrRemove(typename unordered_map<KEY, unordered_set<VAL>>::iterator iter,
+                      const unordered_set<VAL>& rVals, unordered_set<VAL>* goneVals) {
+        trimSet<VAL>(iter->second, rVals, goneVals);
+        bool removeEntry = (iter->second.empty());
+        if (removeEntry) {
+            mMap.erase(iter);
+        }
+        return removeEntry;
+    }
+
+public:
+    inline LocUnorderedSetMap() {}
+    inline LocUnorderedSetMap(size_t size) : LocUnorderedSetMap() {
+        mMap.get_allocator().allocate(size);
+    }
+
+    inline bool empty() { return mMap.empty(); }
+
+    // This gets the raw pointer to the VALs pointed to by *key*
+    // If the entry is not in the map, nullptr will be returned.
+    inline unordered_set<VAL>* getValSetPtr(const KEY& key) {
+        auto entry = mMap.find(key);
+        return (entry != mMap.end()) ? &(entry->second) : nullptr;
+    }
+
+    //  This gets a copy of VALs pointed to by *key*
+    // If the entry is not in the map, an empty set will be returned.
+    inline unordered_set<VAL> getValSet(const KEY& key) {
+        auto entry = mMap.find(key);
+        return (entry != mMap.end()) ? entry->second : unordered_set<VAL>{};
+    }
+
+    // This gets all the KEYs from the map
+    inline unordered_set<KEY> getKeys() {
+        unordered_set<KEY> keys = {};
+        for (auto entry : mMap) {
+            keys.insert(entry.first);
+        }
+        return keys;
+    }
+
+    inline bool remove(const KEY& key) {
+        return mMap.erase(key) > 0;
+    }
+
+    // This looks into all the entries keyed by *keys*. Remove any VALs from the entries
+    // that also exist in *rVals*. If the entry is left with an empty set, the entry will
+    // be removed. The optional parameters *goneKeys* and *goneVals* will record the KEYs
+    // (or entries) and the collapsed VALs removed from the map, respectively.
+    inline void trimOrRemove(unordered_set<KEY>&& keys, const unordered_set<VAL>& rVals,
+                             unordered_set<KEY>* goneKeys, unordered_set<VAL>* goneVals) {
+        trimOrRemove(keys, rVals, goneKeys, goneVals);
+    }
+
+    inline void trimOrRemove(unordered_set<KEY>& keys, const unordered_set<VAL>& rVals,
+                             unordered_set<KEY>* goneKeys, unordered_set<VAL>* goneVals) {
+        for (auto key : keys) {
+            auto iter = mMap.find(key);
+            if (iter != mMap.end() && trimOrRemove(iter, rVals, goneVals) && nullptr != goneKeys) {
+                goneKeys->insert(iter->first);
+            }
+        }
+    }
+
+    // This adds all VALs from *newVals* to the map entry keyed by *key*. Or if it
+    // doesn't exist yet, add the set to the map.
+    bool add(const KEY& key, const unordered_set<VAL>& newVals) {
+        bool newEntryAdded = false;
+        if (!newVals.empty()) {
+            auto iter = mMap.find(key);
+            if (iter != mMap.end()) {
+                iter->second.insert(newVals.begin(), newVals.end());
+            } else {
+                mMap[key] = newVals;
+                newEntryAdded = true;
+            }
+        }
+        return newEntryAdded;
+    }
+
+    // This adds to each of entries in the map keyed by *keys* with the VALs in the
+    // *enwVals*. If there new entries added (new key in *keys*), *newKeys*, if not
+    // null, would be populated with those keys.
+    inline void add(const unordered_set<KEY>& keys, const unordered_set<VAL>&& newVals,
+                    unordered_set<KEY>* newKeys) {
+        add(keys, newVals, newKeys);
+    }
+
+    inline void add(const unordered_set<KEY>& keys, const unordered_set<VAL>& newVals,
+                    unordered_set<KEY>* newKeys) {
+        for (auto key : keys) {
+            if (add(key, newVals) && nullptr != newKeys) {
+                newKeys->insert(key);
+            }
+        }
+    }
+
+    // This puts *newVals* into the map keyed by *key*, and returns the VALs that are
+    // in effect removed from the keyed VAL set in the map entry.
+    // This call would also remove those same VALs from *newVals*.
+    inline unordered_set<VAL> update(const KEY& key, unordered_set<VAL>& newVals) {
+        unordered_set<VAL> goneVals = {};
+        if (newVals.empty()) {
+            mMap.erase(key);
+        } else {
+            auto curVals = mMap[key];
+            mMap[key] = newVals;
+            goneVals = removeAndReturnInterset(curVals, newVals);
+        }
+        return goneVals;
+    }
+};
+
+} // namespace loc_util
+
+#endif // #ifndef __LOC_UNORDERDED_SETMAP_H__
diff --git a/gps/utils/LogBuffer.cpp b/gps/utils/LogBuffer.cpp
new file mode 100644
index 0000000..c280c82
--- /dev/null
+++ b/gps/utils/LogBuffer.cpp
@@ -0,0 +1,189 @@
+/* Copyright (c) 2019 - 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "LogBuffer.h"
+#ifdef USE_GLIB
+#include <execinfo.h>
+#endif
+
+#ifdef LOG_TAG
+#undef LOG_TAG
+#endif
+#define LOG_TAG "LocSvc_LogBuffer"
+
+namespace loc_util {
+
+LogBuffer* LogBuffer::mInstance;
+struct sigaction LogBuffer::mOriSigAction[NSIG];
+struct sigaction LogBuffer::mNewSigAction;
+mutex LogBuffer::sLock;
+
+LogBuffer* LogBuffer::getInstance() {
+    if (mInstance == nullptr) {
+        lock_guard<mutex> guard(sLock);
+        if (mInstance == nullptr) {
+            mInstance = new LogBuffer();
+        }
+    }
+    return mInstance;
+}
+
+LogBuffer::LogBuffer(): mLogList(TOTAL_LOG_LEVELS),
+        mConfigVec(TOTAL_LOG_LEVELS, ConfigsInLevel(TIME_DEPTH_THRESHOLD_MINIMAL_IN_SEC,
+                    MAXIMUM_NUM_IN_LIST, 0)) {
+    loc_param_s_type log_buff_config_table[] =
+    {
+        {"E_LEVEL_TIME_DEPTH",      &mConfigVec[0].mTimeDepthThres,  NULL, 'n'},
+        {"E_LEVEL_MAX_CAPACITY",    &mConfigVec[0].mMaxNumThres,     NULL, 'n'},
+        {"W_LEVEL_TIME_DEPTH",      &mConfigVec[1].mTimeDepthThres,  NULL, 'n'},
+        {"W_LEVEL_MAX_CAPACITY",    &mConfigVec[1].mMaxNumThres,     NULL, 'n'},
+        {"I_LEVEL_TIME_DEPTH",      &mConfigVec[2].mTimeDepthThres,  NULL, 'n'},
+        {"I_LEVEL_MAX_CAPACITY",    &mConfigVec[2].mMaxNumThres,     NULL, 'n'},
+        {"D_LEVEL_TIME_DEPTH",      &mConfigVec[3].mTimeDepthThres,  NULL, 'n'},
+        {"D_LEVEL_MAX_CAPACITY",    &mConfigVec[3].mMaxNumThres,     NULL, 'n'},
+        {"V_LEVEL_TIME_DEPTH",      &mConfigVec[4].mTimeDepthThres,  NULL, 'n'},
+        {"V_LEVEL_MAX_CAPACITY",    &mConfigVec[4].mMaxNumThres,     NULL, 'n'},
+    };
+    loc_read_conf(LOC_PATH_GPS_CONF_STR, log_buff_config_table,
+            sizeof(log_buff_config_table)/sizeof(log_buff_config_table[0]));
+    registerSignalHandler();
+}
+
+void LogBuffer::append(string& data, int level, uint64_t timestamp) {
+    lock_guard<mutex> guard(mLock);
+    pair<uint64_t, string> item(timestamp, data);
+    mLogList.append(item, level);
+    mConfigVec[level].mCurrentSize++;
+
+    while ((timestamp - mLogList.front(level).first) > mConfigVec[level].mTimeDepthThres ||
+            mConfigVec[level].mCurrentSize > mConfigVec[level].mMaxNumThres) {
+        mLogList.pop(level);
+        mConfigVec[level].mCurrentSize--;
+    }
+}
+
+//Dump the log buffer of specific level, level = -1 to dump all the levels in log buffer.
+void LogBuffer::dump(std::function<void(stringstream&)> log, int level) {
+    lock_guard<mutex> guard(mLock);
+    list<pair<pair<uint64_t, string>, int>> li;
+    if (-1 == level) {
+        li = mLogList.dump();
+    } else {
+        li = mLogList.dump(level);
+    }
+    ALOGE("Begining of dump, buffer size: %d", (int)li.size());
+    stringstream ln;
+    ln << "dump log buffer, level[" << level << "]" << ", buffer size: " << li.size() << endl;
+    log(ln);
+    for_each (li.begin(), li.end(), [&, this](const pair<pair<uint64_t, string>, int> &item){
+        stringstream line;
+        line << "["<<item.first.first << "] ";
+        line << "Level " << mLevelMap[item.second] << ": ";
+        line << item.first.second << endl;
+        if (log != nullptr) {
+            log(line);
+        }
+    });
+    ALOGE("End of dump");
+}
+
+void LogBuffer::dumpToAdbLogcat() {
+    dump([](stringstream& line){
+        ALOGE("%s", line.str().c_str());
+    });
+}
+
+void LogBuffer::dumpToLogFile(string filePath) {
+    ALOGE("Dump GPS log buffer to file: %s", filePath.c_str());
+    fstream s;
+    s.open(filePath, std::fstream::out | std::fstream::app);
+    dump([&s](stringstream& line){
+        s << line.str();
+    });
+    s.close();
+}
+
+void LogBuffer::flush() {
+    mLogList.flush();
+}
+
+void LogBuffer::registerSignalHandler() {
+    ALOGE("Singal handler registered");
+    mNewSigAction.sa_sigaction = &LogBuffer::signalHandler;
+    mNewSigAction.sa_flags = SA_SIGINFO | SA_RESTART;
+    sigemptyset(&mNewSigAction.sa_mask);
+
+    sigaction(SIGINT, &mNewSigAction, &mOriSigAction[SIGINT]);
+    sigaction(SIGKILL, &mNewSigAction, &mOriSigAction[SIGKILL]);
+    sigaction(SIGSEGV, &mNewSigAction, &mOriSigAction[SIGSEGV]);
+    sigaction(SIGABRT, &mNewSigAction, &mOriSigAction[SIGABRT]);
+    sigaction(SIGTRAP, &mNewSigAction, &mOriSigAction[SIGTRAP]);
+    sigaction(SIGUSR1, &mNewSigAction, &mOriSigAction[SIGUSR1]);
+}
+
+void LogBuffer::signalHandler(const int code, siginfo_t *const si, void *const sc) {
+    ALOGE("[Gnss Log buffer]Singal handler, signal ID: %d", code);
+
+#ifdef USE_GLIB
+    int nptrs;
+    void *buffer[100];
+    char **strings;
+
+    nptrs = backtrace(buffer, sizeof(buffer)/sizeof(*buffer));
+    strings = backtrace_symbols(buffer, nptrs);
+    if (strings != NULL) {
+        timespec tv;
+        clock_gettime(CLOCK_BOOTTIME, &tv);
+        uint64_t elapsedTime = (uint64_t)tv.tv_sec + (uint64_t)tv.tv_nsec/1000000000;
+        for (int i = 0; i < nptrs; i++) {
+            string s(strings[i]);
+            mInstance->append(s, 0, elapsedTime);
+        }
+    }
+#endif
+    //Dump the log buffer to adb logcat
+    mInstance->dumpToAdbLogcat();
+
+    //Dump the log buffer to file
+    time_t now = time(NULL);
+    struct tm *curr_time = localtime(&now);
+    char path[50];
+    snprintf(path, 50, LOG_BUFFER_FILE_PATH "gpslog_%d%d%d-%d%d%d.log",
+            (1900 + curr_time->tm_year), ( 1 + curr_time->tm_mon), curr_time->tm_mday,
+            curr_time->tm_hour, curr_time->tm_min, curr_time->tm_sec);
+
+    mInstance->dumpToLogFile(path);
+
+    //Process won't be terminated if SIGUSR1 is recieved
+    if (code != SIGUSR1) {
+        mOriSigAction[code].sa_sigaction(code, si, sc);
+    }
+}
+
+}
diff --git a/gps/utils/LogBuffer.h b/gps/utils/LogBuffer.h
new file mode 100644
index 0000000..8d90439
--- /dev/null
+++ b/gps/utils/LogBuffer.h
@@ -0,0 +1,95 @@
+/* Copyright (c) 2019 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef LOG_BUFFER_H
+#define LOG_BUFFER_H
+
+#include "SkipList.h"
+#include "log_util.h"
+#include <loc_cfg.h>
+#include <loc_pla.h>
+#include <string>
+#include <sstream>
+#include <ostream>
+#include <fstream>
+#include <time.h>
+#include <mutex>
+#include <signal.h>
+#include <thread>
+#include <functional>
+
+//default error level time depth threshold,
+#define TIME_DEPTH_THRESHOLD_MINIMAL_IN_SEC 60
+//default maximum log buffer size
+#define MAXIMUM_NUM_IN_LIST 50
+//file path of dumped log buffer
+#define LOG_BUFFER_FILE_PATH "/data/vendor/location/"
+
+namespace loc_util {
+
+class ConfigsInLevel{
+public:
+    uint32_t mTimeDepthThres;
+    uint32_t mMaxNumThres;
+    int mCurrentSize;
+
+    ConfigsInLevel(uint32_t time, int num, int size):
+        mTimeDepthThres(time), mMaxNumThres(num), mCurrentSize(size) {}
+};
+
+class LogBuffer {
+private:
+    static LogBuffer* mInstance;
+    static struct sigaction mOriSigAction[NSIG];
+    static struct sigaction mNewSigAction;
+    static mutex sLock;
+
+    SkipList<pair<uint64_t, string>> mLogList;
+    vector<ConfigsInLevel> mConfigVec;
+    mutex mLock;
+
+    const vector<string> mLevelMap {"E", "W", "I", "D", "V"};
+
+public:
+    static LogBuffer* getInstance();
+    void append(string& data, int level, uint64_t timestamp);
+    void dump(std::function<void(stringstream&)> log, int level = -1);
+    void dumpToAdbLogcat();
+    void dumpToLogFile(string filePath);
+    void flush();
+private:
+    LogBuffer();
+    void registerSignalHandler();
+    static void signalHandler(const int code, siginfo_t *const si, void *const sc);
+
+};
+
+}
+
+#endif
diff --git a/gps/utils/Makefile.am b/gps/utils/Makefile.am
new file mode 100644
index 0000000..ada504c
--- /dev/null
+++ b/gps/utils/Makefile.am
@@ -0,0 +1,75 @@
+ACLOCAL_AMFLAGS = -I m4
+
+AM_CFLAGS = -Wundef \
+        -MD \
+        -Wno-trigraphs \
+        -g -O0 \
+        -fno-inline \
+        -fno-short-enums \
+        -fpic \
+         -I./ \
+         -std=c++14 \
+         $(LOCPLA_CFLAGS)
+
+libgps_utils_la_h_sources = \
+        msg_q.h \
+        linked_list.h \
+        loc_cfg.h \
+        loc_log.h \
+        loc_target.h \
+        loc_timer.h \
+        MsgTask.h \
+        LocHeap.h \
+        LocThread.h \
+        LocTimer.h \
+        LocIpc.h \
+        SkipList.h\
+        loc_misc_utils.h \
+        loc_nmea.h \
+        gps_extended_c.h \
+        gps_extended.h \
+        loc_gps.h \
+        log_util.h \
+        LocSharedLock.h \
+        LocUnorderedSetMap.h\
+        LocLoggerBase.h
+
+libgps_utils_la_c_sources = \
+        linked_list.c \
+        msg_q.c \
+        loc_cfg.cpp \
+        loc_log.cpp \
+        loc_target.cpp \
+        LocHeap.cpp \
+        LocTimer.cpp \
+        LocThread.cpp \
+        LocIpc.cpp \
+        LogBuffer.cpp \
+        MsgTask.cpp \
+        loc_misc_utils.cpp \
+        loc_nmea.cpp
+
+library_includedir = $(pkgincludedir)
+
+library_include_HEADERS = $(libgps_utils_la_h_sources)
+
+libgps_utils_la_SOURCES = $(libgps_utils_la_c_sources)
+
+if USE_GLIB
+libgps_utils_la_CFLAGS = -DUSE_GLIB $(AM_CFLAGS) @GLIB_CFLAGS@
+libgps_utils_la_LDFLAGS = -lstdc++ -Wl,-z,defs -lpthread @GLIB_LIBS@ -shared -version-info 1:0:0
+libgps_utils_la_CPPFLAGS = -DUSE_GLIB $(AM_CFLAGS) $(AM_CPPFLAGS) @GLIB_CFLAGS@
+else
+libgps_utils_la_CFLAGS = $(AM_CFLAGS)
+libgps_utils_la_LDFLAGS = -Wl,-z,defs -lpthread -shared -version-info 1:0:0
+libgps_utils_la_CPPFLAGS = $(AM_CFLAGS) $(AM_CPPFLAGS)
+endif
+
+libgps_utils_la_LIBADD = $(CUTILS_LIBS) -ldl
+
+#Create and Install libraries
+lib_LTLIBRARIES = libgps_utils.la
+
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = gps-utils.pc
+EXTRA_DIST = $(pkgconfig_DATA)
diff --git a/gps/utils/MsgTask.cpp b/gps/utils/MsgTask.cpp
new file mode 100644
index 0000000..6ef689a
--- /dev/null
+++ b/gps/utils/MsgTask.cpp
@@ -0,0 +1,120 @@
+/* Copyright (c) 2011-2013, 2015, 2017, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#define LOG_NDEBUG 0
+#define LOG_TAG "LocSvc_MsgTask"
+
+#include <unistd.h>
+#include <MsgTask.h>
+#include <msg_q.h>
+#include <log_util.h>
+#include <loc_log.h>
+#include <loc_pla.h>
+
+namespace loc_util {
+
+class MTRunnable : public LocRunnable {
+    const void* mQ;
+public:
+    inline MTRunnable(const void* q) : mQ(q) {}
+    virtual ~MTRunnable();
+    // Overrides of LocRunnable methods
+    // This method will be repeated called until it returns false; or
+    // until thread is stopped.
+    virtual bool run() override;
+
+    // The method to be run before thread loop (conditionally repeatedly)
+    // calls run()
+    virtual void prerun() override;
+
+    // to interrupt the run() method and come out of that
+    virtual void interrupt() override;
+};
+
+static void LocMsgDestroy(void* msg) {
+    delete (LocMsg*)msg;
+}
+
+MsgTask::MsgTask(const char* threadName) :
+    mQ(msg_q_init2()), mThread() {
+    mThread.start(threadName, std::make_shared<MTRunnable>(mQ));
+}
+
+void MsgTask::sendMsg(const LocMsg* msg) const {
+    if (msg && this) {
+        msg_q_snd((void*)mQ, (void*)msg, LocMsgDestroy);
+    } else {
+        LOC_LOGE("%s: msg is %p and this is %p",
+                 __func__, msg, this);
+    }
+}
+
+void MsgTask::sendMsg(const std::function<void()> runnable) const {
+    struct RunMsg : public LocMsg {
+        const std::function<void()> mRunnable;
+    public:
+        inline RunMsg(const std::function<void()> runnable) : mRunnable(runnable) {}
+        ~RunMsg() = default;
+        inline virtual void proc() const override { mRunnable(); }
+    };
+    sendMsg(new RunMsg(runnable));
+}
+
+void MTRunnable::interrupt() {
+    msg_q_unblock((void*)mQ);
+}
+
+void MTRunnable::prerun() {
+    // make sure we do not run in background scheduling group
+     set_sched_policy(gettid(), SP_FOREGROUND);
+}
+
+bool MTRunnable::run() {
+    LocMsg* msg;
+    msq_q_err_type result = msg_q_rcv((void*)mQ, (void **)&msg);
+    if (eMSG_Q_SUCCESS != result) {
+        LOC_LOGE("%s:%d] fail receiving msg: %s\n", __func__, __LINE__,
+                 loc_get_msg_q_status(result));
+        return false;
+    }
+
+    msg->log();
+    // there is where each individual msg handling is invoked
+    msg->proc();
+
+    delete msg;
+
+    return true;
+}
+
+MTRunnable::~MTRunnable() {
+    msg_q_flush((void*)mQ);
+    msg_q_destroy((void**)&mQ);
+}
+
+} // namespace loc_util
diff --git a/gps/utils/MsgTask.h b/gps/utils/MsgTask.h
new file mode 100644
index 0000000..a8cce9e
--- /dev/null
+++ b/gps/utils/MsgTask.h
@@ -0,0 +1,56 @@
+/* Copyright (c) 2011-2013, 2015, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#ifndef __MSG_TASK__
+#define __MSG_TASK__
+
+#include <functional>
+#include <LocThread.h>
+
+namespace loc_util {
+
+struct LocMsg {
+    inline LocMsg() {}
+    inline virtual ~LocMsg() {}
+    virtual void proc() const = 0;
+    inline virtual void log() const {}
+};
+
+class MsgTask {
+    const void* mQ;
+    LocThread mThread;
+public:
+    ~MsgTask() = default;
+    MsgTask(const char* threadName = NULL);
+    void sendMsg(const LocMsg* msg) const;
+    void sendMsg(const std::function<void()> runnable) const;
+};
+
+} //
+
+#endif //__MSG_TASK__
diff --git a/gps/utils/SkipList.h b/gps/utils/SkipList.h
new file mode 100644
index 0000000..afaa1a6
--- /dev/null
+++ b/gps/utils/SkipList.h
@@ -0,0 +1,158 @@
+/* Copyright (c) 2019 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef LOC_SKIP_LIST_H
+#define LOC_SKIP_LIST_H
+
+#include <stdlib.h>
+#include <list>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+
+using namespace std;
+
+namespace loc_util {
+
+template <typename T,
+         template<typename elem, typename Allocator = std::allocator<elem>> class container = list>
+class SkipNode {
+public:
+    typedef typename container<SkipNode<T, container>>::iterator NodeIterator;
+
+    int mLevel;
+    T mData;
+    NodeIterator mNextInLevel;
+
+    SkipNode(int level, T& data): mLevel(level), mData(data) {}
+};
+
+template <typename T>
+class SkipList {
+    using NodeIterator = typename SkipNode<T>::NodeIterator;
+private:
+    list<SkipNode<T>> mMainList;
+    vector<NodeIterator> mHeadVec;
+    vector<NodeIterator> mTailVec;
+public:
+    SkipList(int totalLevels);
+    void append(T& data, int level);
+    void pop(int level);
+    void pop();
+    T front(int level);
+    int size();
+    void flush();
+    list<pair<T, int>> dump();
+    list<pair<T, int>> dump(int level);
+};
+
+template <typename T>
+SkipList<T>::SkipList(int totalLevels): mHeadVec(totalLevels, mMainList.end()),
+        mTailVec(totalLevels, mMainList.end()) {}
+
+template <typename T>
+void SkipList<T>::append(T& data, int level) {
+    if ( level < 0 || level >= mHeadVec.size()) {
+        return;
+    }
+
+    SkipNode<T> node(level, data);
+    node.mNextInLevel = mMainList.end();
+    mMainList.push_back(node);
+    auto iter = --mMainList.end();
+    if (mHeadVec[level] == mMainList.end()) {
+        mHeadVec[level] = iter;
+    } else {
+        (*mTailVec[level]).mNextInLevel = iter;
+    }
+    mTailVec[level] = iter;
+}
+
+template <typename T>
+void SkipList<T>::pop(int level) {
+    if (mHeadVec[level] == mMainList.end()) {
+        return;
+    }
+
+    if ((*mHeadVec[level]).mNextInLevel == mMainList.end()) {
+        mTailVec[level] = mMainList.end();
+    }
+
+    auto tmp_iter = (*mHeadVec[level]).mNextInLevel;
+    mMainList.erase(mHeadVec[level]);
+    mHeadVec[level] = tmp_iter;
+}
+
+template <typename T>
+void SkipList<T>::pop() {
+    pop(mMainList.front().mLevel);
+}
+
+template <typename T>
+T SkipList<T>::front(int level) {
+    return (*mHeadVec[level]).mData;
+}
+
+template <typename T>
+int SkipList<T>::size() {
+    return mMainList.size();
+}
+
+template <typename T>
+void SkipList<T>::flush() {
+    mMainList.clear();
+    for (int i = 0; i < mHeadVec.size(); i++) {
+        mHeadVec[i] = mMainList.end();
+        mTailVec[i] = mMainList.end();
+    }
+}
+
+template <typename T>
+list<pair<T, int>> SkipList<T>::dump() {
+    list<pair<T, int>> li;
+    for_each(mMainList.begin(), mMainList.end(), [&](SkipNode<T> &item) {
+        li.push_back(make_pair(item.mData, item.mLevel));
+    });
+    return li;
+}
+
+template <typename T>
+list<pair<T, int>> SkipList<T>::dump(int level) {
+    list<pair<T, int>> li;
+    auto head = mHeadVec[level];
+    while (head != mMainList.end()) {
+        li.push_back(make_pair((*head).mData, (*head).mLevel));
+        head = (*head).mNextInLevel;
+    }
+    return li;
+}
+
+}
+
+#endif
diff --git a/gps/utils/configure.ac b/gps/utils/configure.ac
new file mode 100644
index 0000000..2a04f45
--- /dev/null
+++ b/gps/utils/configure.ac
@@ -0,0 +1,92 @@
+# configure.ac -- Autoconf script for gps gps-utils
+#
+# Process this file with autoconf to produce a configure script
+
+# Requires autoconf tool later than 2.61
+AC_PREREQ(2.61)
+# Initialize the gps gps-utils package version 1.0.0
+AC_INIT([gps-utils],1.0.0)
+# Does not strictly follow GNU Coding standards
+AM_INIT_AUTOMAKE([foreign subdir-objects])
+# Disables auto rebuilding of configure, Makefile.ins
+AM_MAINTAINER_MODE
+# Verifies the --srcdir is correct by checking for the path
+AC_CONFIG_SRCDIR([Makefile.am])
+# defines some macros variable to be included by source
+AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_MACRO_DIR([m4])
+
+# Checks for programs.
+AC_PROG_LIBTOOL
+AC_PROG_CXX
+AC_PROG_CC
+AM_PROG_CC_C_O
+AC_PROG_AWK
+AC_PROG_CPP
+AC_PROG_INSTALL
+AC_PROG_LN_S
+AC_PROG_MAKE_SET
+PKG_PROG_PKG_CONFIG
+
+AC_ARG_WITH([external_ap],
+    AC_HELP_STRING([--with-external_ap=@<:@dir@:>@],
+        [Using External Application Processor]),
+    [],
+    with_external_ap=no)
+
+if test "x$with_external_ap" != "xno"; then
+    CPPFLAGS="${CPPFLAGS} -DFEATURE_EXTERNAL_AP"
+else
+    # Checks for libraries.
+    PKG_CHECK_MODULES([CUTILS], [libcutils])
+    AC_SUBST([CUTILS_CFLAGS])
+    AC_SUBST([CUTILS_LIBS])
+fi
+
+AC_ARG_WITH([core_includes],
+      AC_HELP_STRING([--with-core-includes=@<:@dir@:>@],
+         [Specify the location of the core headers]),
+      [core_incdir=$withval],
+      with_core_includes=no)
+
+if test "x$with_core_includes" != "xno"; then
+   CPPFLAGS="${CPPFLAGS} -I${core_incdir}"
+fi
+
+AC_ARG_WITH([locpla_includes],
+      AC_HELP_STRING([--with-locpla-includes=@<:@dir@:>@],
+         [specify the path to locpla-includes in loc-pla_git.bb]),
+      [locpla_incdir=$withval],
+      with_locpla_includes=no)
+
+if test "x$with_locpla_includes" != "xno"; then
+   AC_SUBST(LOCPLA_CFLAGS, "-I${locpla_incdir}")
+fi
+
+AC_SUBST([CPPFLAGS])
+
+AC_ARG_WITH([glib],
+      AC_HELP_STRING([--with-glib],
+         [enable glib, building HLOS systems which use glib]))
+
+if (test "x${with_glib}" = "xyes"); then
+        AC_DEFINE(ENABLE_USEGLIB, 1, [Define if HLOS systems uses glib])
+        PKG_CHECK_MODULES(GTHREAD, gthread-2.0 >= 2.16, dummy=yes,
+                                AC_MSG_ERROR(GThread >= 2.16 is required))
+        PKG_CHECK_MODULES(GLIB, glib-2.0 >= 2.16, dummy=yes,
+                                AC_MSG_ERROR(GLib >= 2.16 is required))
+        GLIB_CFLAGS="$GLIB_CFLAGS $GTHREAD_CFLAGS"
+        GLIB_LIBS="$GLIB_LIBS $GTHREAD_LIBS"
+
+        AC_SUBST(GLIB_CFLAGS)
+        AC_SUBST(GLIB_LIBS)
+fi
+
+AM_CONDITIONAL(USE_GLIB, test "x${with_glib}" = "xyes")
+
+AC_CONFIG_FILES([ \
+        Makefile \
+        gps-utils.pc
+        ])
+
+AC_OUTPUT
diff --git a/gps/utils/gps-utils.pc.in b/gps/utils/gps-utils.pc.in
new file mode 100644
index 0000000..a988731
--- /dev/null
+++ b/gps/utils/gps-utils.pc.in
@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: gps-utils
+Description: QTI GPS Location utils
+Version: @VERSION
+Libs: -L${libdir} -lgps_utils
+Cflags: -I${includedir}/gps-utils
diff --git a/gps/utils/gps_extended.h b/gps/utils/gps_extended.h
new file mode 100644
index 0000000..2455629
--- /dev/null
+++ b/gps/utils/gps_extended.h
@@ -0,0 +1,114 @@
+/* Copyright (c) 2013-2017 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GPS_EXTENDED_H
+#define GPS_EXTENDED_H
+
+/**
+ * @file
+ * @brief C++ declarations for GPS types
+ */
+
+#include <gps_extended_c.h>
+#if defined(USE_GLIB) || defined(OFF_TARGET)
+#include <string.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+
+
+struct LocPosMode
+{
+    LocPositionMode mode;
+    LocGpsPositionRecurrence recurrence;
+    uint32_t min_interval;
+    uint32_t preferred_accuracy;
+    uint32_t preferred_time;
+    bool share_position;
+    char credentials[14];
+    char provider[8];
+    GnssPowerMode powerMode;
+    uint32_t timeBetweenMeasurements;
+    LocPosMode(LocPositionMode m, LocGpsPositionRecurrence recr,
+               uint32_t gap, uint32_t accu, uint32_t time,
+               bool sp, const char* cred, const char* prov,
+               GnssPowerMode pMode = GNSS_POWER_MODE_INVALID,
+               uint32_t tbm = 0) :
+        mode(m), recurrence(recr),
+        min_interval(gap < GPS_MIN_POSSIBLE_FIX_INTERVAL_MS ?
+                     GPS_MIN_POSSIBLE_FIX_INTERVAL_MS : gap),
+        preferred_accuracy(accu), preferred_time(time),
+        share_position(sp), powerMode(pMode),
+        timeBetweenMeasurements(tbm) {
+        memset(credentials, 0, sizeof(credentials));
+        memset(provider, 0, sizeof(provider));
+        if (NULL != cred) {
+            memcpy(credentials, cred, sizeof(credentials)-1);
+        }
+        if (NULL != prov) {
+            memcpy(provider, prov, sizeof(provider)-1);
+        }
+    }
+
+    inline LocPosMode() :
+        mode(LOC_POSITION_MODE_MS_BASED),
+        recurrence(LOC_GPS_POSITION_RECURRENCE_PERIODIC),
+        min_interval(GPS_DEFAULT_FIX_INTERVAL_MS),
+        preferred_accuracy(50), preferred_time(120000),
+        share_position(true), powerMode(GNSS_POWER_MODE_INVALID),
+        timeBetweenMeasurements(GPS_DEFAULT_FIX_INTERVAL_MS) {
+        memset(credentials, 0, sizeof(credentials));
+        memset(provider, 0, sizeof(provider));
+    }
+
+    inline bool equals(const LocPosMode &anotherMode) const
+    {
+        return anotherMode.mode == mode &&
+            anotherMode.recurrence == recurrence &&
+            anotherMode.min_interval == min_interval &&
+            anotherMode.preferred_accuracy == preferred_accuracy &&
+            anotherMode.preferred_time == preferred_time &&
+            anotherMode.powerMode == powerMode &&
+            anotherMode.timeBetweenMeasurements == timeBetweenMeasurements &&
+            !strncmp(anotherMode.credentials, credentials, sizeof(credentials)-1) &&
+            !strncmp(anotherMode.provider, provider, sizeof(provider)-1);
+    }
+
+    void logv() const;
+};
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* GPS_EXTENDED_H */
+
diff --git a/gps/utils/gps_extended_c.h b/gps/utils/gps_extended_c.h
new file mode 100644
index 0000000..f368975
--- /dev/null
+++ b/gps/utils/gps_extended_c.h
@@ -0,0 +1,2429 @@
+/* Copyright (c) 2013-2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GPS_EXTENDED_C_H
+#define GPS_EXTENDED_C_H
+
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <loc_gps.h>
+#include <LocationAPI.h>
+
+struct timespec32_t {
+  uint32_t  tv_sec;   /* seconds */
+  uint32_t  tv_nsec;  /* and nanoseconds */
+};
+
+
+/**
+ * @file
+ * @brief C++ declarations for GPS types
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/** Location has valid source information. */
+#define LOCATION_HAS_SOURCE_INFO   0x0020
+/** LocGpsLocation has valid "is indoor?" flag */
+#define LOC_GPS_LOCATION_HAS_IS_INDOOR   0x0040
+/** LocGpsLocation has valid floor number */
+#define LOC_GPS_LOCATION_HAS_FLOOR_NUMBER   0x0080
+/** LocGpsLocation has valid map URL*/
+#define LOC_GPS_LOCATION_HAS_MAP_URL   0x0100
+/** LocGpsLocation has valid map index */
+#define LOC_GPS_LOCATION_HAS_MAP_INDEX   0x0200
+
+#define GNSS_INVALID_JAMMER_IND 0x7FFFFFFF
+
+/** Sizes for indoor fields */
+#define GPS_LOCATION_MAP_URL_SIZE 400
+#define GPS_LOCATION_MAP_INDEX_SIZE 16
+
+/** Position source is ULP */
+#define ULP_LOCATION_IS_FROM_HYBRID   0x0001
+/** Position source is GNSS only */
+#define ULP_LOCATION_IS_FROM_GNSS     0x0002
+/** Position is from a Geofence Breach Event */
+#define ULP_LOCATION_IS_FROM_GEOFENCE 0X0004
+/** Position is from Hardware FLP */
+#define ULP_LOCATION_IS_FROM_HW_FLP   0x0008
+/** Position is from NLP */
+#define ULP_LOCATION_IS_FROM_NLP      0x0010
+/** Position is from external DR solution*/
+#define ULP_LOCATION_IS_FROM_EXT_DR   0X0020
+/** Raw GNSS position fixes */
+#define ULP_LOCATION_IS_FROM_GNSS_RAW   0X0040
+
+typedef uint32_t LocSvInfoSource;
+/** SVinfo source is GNSS/DR */
+#define ULP_SVINFO_IS_FROM_GNSS       ((LocSvInfoSource)0x0001)
+/** Raw SVinfo from GNSS */
+#define ULP_SVINFO_IS_FROM_DR         ((LocSvInfoSource)0x0002)
+
+#define ULP_MIN_INTERVAL_INVALID 0xffffffff
+#define ULP_MAX_NMEA_STRING_SIZE 201
+
+/*Emergency SUPL*/
+#define LOC_GPS_NI_TYPE_EMERGENCY_SUPL    4
+
+#define LOC_AGPS_CERTIFICATE_MAX_LENGTH 2000
+#define LOC_AGPS_CERTIFICATE_MAX_SLOTS 10
+
+/* TBM Threshold for tracking in background power mode : in millis */
+#define TRACKING_TBM_THRESHOLD_MILLIS 480000
+
+/**  Maximum number of satellites in an ephemeris report.  */
+#define GNSS_EPHEMERIS_LIST_MAX_SIZE_V02 32
+
+typedef uint32_t LocPosTechMask;
+#define LOC_POS_TECH_MASK_DEFAULT ((LocPosTechMask)0x00000000)
+#define LOC_POS_TECH_MASK_SATELLITE ((LocPosTechMask)0x00000001)
+#define LOC_POS_TECH_MASK_CELLID ((LocPosTechMask)0x00000002)
+#define LOC_POS_TECH_MASK_WIFI ((LocPosTechMask)0x00000004)
+#define LOC_POS_TECH_MASK_SENSORS ((LocPosTechMask)0x00000008)
+#define LOC_POS_TECH_MASK_REFERENCE_LOCATION ((LocPosTechMask)0x00000010)
+#define LOC_POS_TECH_MASK_INJECTED_COARSE_POSITION ((LocPosTechMask)0x00000020)
+#define LOC_POS_TECH_MASK_AFLT ((LocPosTechMask)0x00000040)
+#define LOC_POS_TECH_MASK_HYBRID ((LocPosTechMask)0x00000080)
+#define LOC_POS_TECH_MASK_PPE ((LocPosTechMask)0x00000100)
+#define LOC_POS_TECH_MASK_VEH ((LocPosTechMask)0x00000200)
+#define LOC_POS_TECH_MASK_VIS ((LocPosTechMask)0x00000400)
+
+
+enum loc_registration_mask_status {
+    LOC_REGISTRATION_MASK_ENABLED,
+    LOC_REGISTRATION_MASK_DISABLED,
+    LOC_REGISTRATION_MASK_SET
+};
+
+typedef enum {
+    LOC_SUPPORTED_FEATURE_ODCPI_2_V02 = 0, /**<  Support ODCPI version 2 feature  */
+    LOC_SUPPORTED_FEATURE_WIFI_AP_DATA_INJECT_2_V02, /**<  Support Wifi AP data inject version 2 feature  */
+    LOC_SUPPORTED_FEATURE_DEBUG_NMEA_V02, /**< Support debug NMEA feature */
+    LOC_SUPPORTED_FEATURE_GNSS_ONLY_POSITION_REPORT, /**< Support GNSS Only position reports */
+    LOC_SUPPORTED_FEATURE_FDCL, /**< Support FDCL */
+    LOC_SUPPORTED_FEATURE_CONSTELLATION_ENABLEMENT_V02, /**< Support constellation enablement */
+    LOC_SUPPORTED_FEATURE_AGPM_V02, /**< Support AGPM feature */
+    LOC_SUPPORTED_FEATURE_XTRA_INTEGRITY, /**< Support XTRA integrity */
+    LOC_SUPPORTED_FEATURE_FDCL_2, /**< Support FDCL V2 */
+    LOC_SUPPORTED_FEATURE_LOCATION_PRIVACY, /**< Support location privacy */
+    LOC_SUPPORTED_FEATURE_NAVIC, /**< Support NAVIC constellation */
+    LOC_SUPPORTED_FEATURE_MEASUREMENTS_CORRECTION, /**< Support measurements correction */
+    LOC_SUPPORTED_FEATURE_ROBUST_LOCATION, /**<  Support Robust Location feature */
+    LOC_SUPPORTED_FEATURE_EDGNSS /**< Support precise location dgnss */
+} loc_supported_feature_enum;
+
+typedef struct {
+    /** set to sizeof(UlpLocation) */
+    uint32_t          size;
+    LocGpsLocation     gpsLocation;
+    /* Provider indicator for HYBRID or GPS */
+    uint16_t        position_source;
+    LocPosTechMask  tech_mask;
+    bool            unpropagatedPosition;
+} UlpLocation;
+
+typedef struct {
+    /** set to sizeof(UlpNmea) */
+    uint32_t          size;
+    char            nmea_str[ULP_MAX_NMEA_STRING_SIZE];
+    unsigned int    len;
+} UlpNmea;
+
+
+/** AGPS type */
+typedef int8_t AGpsExtType;
+#define LOC_AGPS_TYPE_INVALID       -1
+#define LOC_AGPS_TYPE_ANY           0
+#define LOC_AGPS_TYPE_SUPL          1
+#define LOC_AGPS_TYPE_C2K           2
+#define LOC_AGPS_TYPE_WWAN_ANY      3
+#define LOC_AGPS_TYPE_WIFI          4
+#define LOC_AGPS_TYPE_SUPL_ES       5
+
+/** SSID length */
+#define SSID_BUF_SIZE (32+1)
+
+typedef int16_t AGpsBearerType;
+#define AGPS_APN_BEARER_INVALID     0
+#define AGPS_APN_BEARER_IPV4        1
+#define AGPS_APN_BEARER_IPV6        2
+#define AGPS_APN_BEARER_IPV4V6      3
+
+typedef uint32_t LocApnTypeMask;
+/**<  Denotes APN type for Default/Internet traffic  */
+#define LOC_APN_TYPE_MASK_DEFAULT   ((LocApnTypeMask)0x00000001)
+/**<  Denotes  APN type for IP Multimedia Subsystem  */
+#define LOC_APN_TYPE_MASK_IMS       ((LocApnTypeMask)0x00000002)
+/**<  Denotes APN type for Multimedia Messaging Service  */
+#define LOC_APN_TYPE_MASK_MMS       ((LocApnTypeMask)0x00000004)
+/**<  Denotes APN type for Dial Up Network  */
+#define LOC_APN_TYPE_MASK_DUN       ((LocApnTypeMask)0x00000008)
+/**<  Denotes APN type for Secure User Plane Location  */
+#define LOC_APN_TYPE_MASK_SUPL      ((LocApnTypeMask)0x00000010)
+/**<  Denotes APN type for High Priority Mobile Data  */
+#define LOC_APN_TYPE_MASK_HIPRI     ((LocApnTypeMask)0x00000020)
+/**<  Denotes APN type for over the air administration  */
+#define LOC_APN_TYPE_MASK_FOTA      ((LocApnTypeMask)0x00000040)
+/**<  Denotes APN type for Carrier Branded Services  */
+#define LOC_APN_TYPE_MASK_CBS       ((LocApnTypeMask)0x00000080)
+/**<  Denotes APN type for Initial Attach  */
+#define LOC_APN_TYPE_MASK_IA        ((LocApnTypeMask)0x00000100)
+/**<  Denotes APN type for emergency  */
+#define LOC_APN_TYPE_MASK_EMERGENCY ((LocApnTypeMask)0x00000200)
+
+typedef uint32_t AGpsTypeMask;
+#define AGPS_ATL_TYPE_SUPL       ((AGpsTypeMask)0x00000001)
+#define AGPS_ATL_TYPE_SUPL_ES   ((AGpsTypeMask)0x00000002)
+#define AGPS_ATL_TYPE_WWAN       ((AGpsTypeMask)0x00000004)
+
+typedef struct {
+    void* statusV4Cb;
+    AGpsTypeMask atlType;
+} AgpsCbInfo;
+
+typedef struct {
+    void* visibilityControlCb;
+    void* isInEmergencySession;
+} NfwCbInfo;
+
+/** GPS extended callback structure. */
+typedef struct {
+    /** set to sizeof(LocGpsCallbacks) */
+    uint32_t      size;
+    loc_gps_set_capabilities set_capabilities_cb;
+    loc_gps_acquire_wakelock acquire_wakelock_cb;
+    loc_gps_release_wakelock release_wakelock_cb;
+    loc_gps_create_thread create_thread_cb;
+    loc_gps_request_utc_time request_utc_time_cb;
+} GpsExtCallbacks;
+
+/** Callback to report the xtra server url to the client.
+ *  The client should use this url when downloading xtra unless overwritten
+ *  in the gps.conf file
+ */
+typedef void (* report_xtra_server)(const char*, const char*, const char*);
+
+/** Callback structure for the XTRA interface. */
+typedef struct {
+    loc_gps_xtra_download_request download_request_cb;
+    loc_gps_create_thread create_thread_cb;
+    report_xtra_server report_xtra_server_cb;
+} GpsXtraExtCallbacks;
+
+/** Represents the status of AGPS. */
+typedef struct {
+    /** set to sizeof(AGpsExtStatus) */
+    uint32_t          size;
+
+    AGpsExtType type;
+    LocAGpsStatusValue status;
+    uint32_t        ipv4_addr;
+    struct sockaddr_storage addr;
+    char            ssid[SSID_BUF_SIZE];
+    char            password[SSID_BUF_SIZE];
+} AGpsExtStatus;
+
+/** Callback with AGPS status information.
+ *  Can only be called from a thread created by create_thread_cb.
+ */
+typedef void (* agps_status_extended)(AGpsExtStatus* status);
+
+/** Callback structure for the AGPS interface. */
+typedef struct {
+    agps_status_extended status_cb;
+    loc_gps_create_thread create_thread_cb;
+} AGpsExtCallbacks;
+
+
+typedef void (*loc_ni_notify_callback)(LocGpsNiNotification *notification, bool esEnalbed);
+/** GPS NI callback structure. */
+typedef struct
+{
+    /**
+     * Sends the notification request from HAL to GPSLocationProvider.
+     */
+    loc_ni_notify_callback notify_cb;
+} GpsNiExtCallbacks;
+
+typedef enum loc_server_type {
+    LOC_AGPS_CDMA_PDE_SERVER,
+    LOC_AGPS_CUSTOM_PDE_SERVER,
+    LOC_AGPS_MPC_SERVER,
+    LOC_AGPS_SUPL_SERVER,
+    LOC_AGPS_MO_SUPL_SERVER
+} LocServerType;
+
+typedef enum loc_position_mode_type {
+    LOC_POSITION_MODE_INVALID = -1,
+    LOC_POSITION_MODE_STANDALONE = 0,
+    LOC_POSITION_MODE_MS_BASED,
+    LOC_POSITION_MODE_MS_ASSISTED,
+    LOC_POSITION_MODE_RESERVED_1,
+    LOC_POSITION_MODE_RESERVED_2,
+    LOC_POSITION_MODE_RESERVED_3,
+    LOC_POSITION_MODE_RESERVED_4,
+    LOC_POSITION_MODE_RESERVED_5
+
+} LocPositionMode;
+
+/**
+ * @brief Minimum allowed value for fix interval.
+ *
+ * This value is a sanity limit in GPS framework. The hardware has own internal
+ * limits that may not match this value
+ *
+ * @sa GPS_DEFAULT_FIX_INTERVAL_MS
+ */
+
+#define GPS_MIN_POSSIBLE_FIX_INTERVAL_MS 100
+/**
+ * @brief Default value for fix interval.
+ *
+ * This value is used by default whenever appropriate.
+ *
+ * @sa GPS_MIN_POSSIBLE_FIX_INTERVAL_MS
+ */
+#define GPS_DEFAULT_FIX_INTERVAL_MS      1000
+
+/** Flags to indicate which values are valid in a GpsLocationExtended. */
+typedef uint64_t GpsLocationExtendedFlags;
+/** GpsLocationExtended has valid pdop, hdop, vdop. */
+#define GPS_LOCATION_EXTENDED_HAS_DOP 0x0001
+/** GpsLocationExtended has valid altitude mean sea level. */
+#define GPS_LOCATION_EXTENDED_HAS_ALTITUDE_MEAN_SEA_LEVEL 0x0002
+/** UlpLocation has valid magnetic deviation. */
+#define GPS_LOCATION_EXTENDED_HAS_MAG_DEV 0x0004
+/** UlpLocation has valid mode indicator. */
+#define GPS_LOCATION_EXTENDED_HAS_MODE_IND 0x0008
+/** GpsLocationExtended has valid vertical uncertainty */
+#define GPS_LOCATION_EXTENDED_HAS_VERT_UNC 0x0010
+/** GpsLocationExtended has valid speed uncertainty */
+#define GPS_LOCATION_EXTENDED_HAS_SPEED_UNC 0x0020
+/** GpsLocationExtended has valid heading uncertainty */
+#define GPS_LOCATION_EXTENDED_HAS_BEARING_UNC 0x0040
+/** GpsLocationExtended has valid horizontal reliability */
+#define GPS_LOCATION_EXTENDED_HAS_HOR_RELIABILITY 0x0080
+/** GpsLocationExtended has valid vertical reliability */
+#define GPS_LOCATION_EXTENDED_HAS_VERT_RELIABILITY 0x0100
+/** GpsLocationExtended has valid Horizontal Elliptical Uncertainty (Semi-Major Axis) */
+#define GPS_LOCATION_EXTENDED_HAS_HOR_ELIP_UNC_MAJOR 0x0200
+/** GpsLocationExtended has valid Horizontal Elliptical Uncertainty (Semi-Minor Axis) */
+#define GPS_LOCATION_EXTENDED_HAS_HOR_ELIP_UNC_MINOR 0x0400
+/** GpsLocationExtended has valid Elliptical Horizontal Uncertainty Azimuth */
+#define GPS_LOCATION_EXTENDED_HAS_HOR_ELIP_UNC_AZIMUTH 0x0800
+/** GpsLocationExtended has valid gnss sv used in position data */
+#define GPS_LOCATION_EXTENDED_HAS_GNSS_SV_USED_DATA 0x1000
+/** GpsLocationExtended has valid navSolutionMask */
+#define GPS_LOCATION_EXTENDED_HAS_NAV_SOLUTION_MASK 0x2000
+/** GpsLocationExtended has valid LocPosTechMask */
+#define GPS_LOCATION_EXTENDED_HAS_POS_TECH_MASK   0x4000
+/** GpsLocationExtended has valid LocSvInfoSource */
+#define GPS_LOCATION_EXTENDED_HAS_SV_SOURCE_INFO   0x8000
+/** GpsLocationExtended has valid position dynamics data */
+#define GPS_LOCATION_EXTENDED_HAS_POS_DYNAMICS_DATA   0x10000
+/** GpsLocationExtended has GPS Time */
+#define GPS_LOCATION_EXTENDED_HAS_GPS_TIME   0x20000
+/** GpsLocationExtended has Extended Dilution of Precision */
+#define GPS_LOCATION_EXTENDED_HAS_EXT_DOP   0x40000
+/** GpsLocationExtended has North standard deviation */
+#define GPS_LOCATION_EXTENDED_HAS_NORTH_STD_DEV   0x80000
+/** GpsLocationExtended has East standard deviation*/
+#define GPS_LOCATION_EXTENDED_HAS_EAST_STD_DEV   0x100000
+/** GpsLocationExtended has North Velocity */
+#define GPS_LOCATION_EXTENDED_HAS_NORTH_VEL   0x200000
+/** GpsLocationExtended has East Velocity */
+#define GPS_LOCATION_EXTENDED_HAS_EAST_VEL   0x400000
+/** GpsLocationExtended has up Velocity */
+#define GPS_LOCATION_EXTENDED_HAS_UP_VEL   0x800000
+/** GpsLocationExtended has North Velocity Uncertainty */
+#define GPS_LOCATION_EXTENDED_HAS_NORTH_VEL_UNC   0x1000000
+/** GpsLocationExtended has East Velocity Uncertainty */
+#define GPS_LOCATION_EXTENDED_HAS_EAST_VEL_UNC   0x2000000
+/** GpsLocationExtended has up Velocity Uncertainty */
+#define GPS_LOCATION_EXTENDED_HAS_UP_VEL_UNC   0x4000000
+/** GpsLocationExtended has Clock Bias */
+#define GPS_LOCATION_EXTENDED_HAS_CLOCK_BIAS   0x8000000
+/** GpsLocationExtended has Clock Bias std deviation*/
+#define GPS_LOCATION_EXTENDED_HAS_CLOCK_BIAS_STD_DEV   0x10000000
+/** GpsLocationExtended has Clock drift*/
+#define GPS_LOCATION_EXTENDED_HAS_CLOCK_DRIFT   0x20000000
+/** GpsLocationExtended has Clock drift std deviation**/
+#define GPS_LOCATION_EXTENDED_HAS_CLOCK_DRIFT_STD_DEV    0x40000000
+/** GpsLocationExtended has leap seconds **/
+#define GPS_LOCATION_EXTENDED_HAS_LEAP_SECONDS           0x80000000
+/** GpsLocationExtended has time uncertainty **/
+#define GPS_LOCATION_EXTENDED_HAS_TIME_UNC               0x100000000
+/** GpsLocationExtended has heading rate  **/
+#define GPS_LOCATION_EXTENDED_HAS_HEADING_RATE           0x200000000
+/** GpsLocationExtended has multiband signals  **/
+#define GPS_LOCATION_EXTENDED_HAS_MULTIBAND              0x400000000
+/** GpsLocationExtended has sensor calibration confidence */
+#define GPS_LOCATION_EXTENDED_HAS_CALIBRATION_CONFIDENCE 0x800000000
+/** GpsLocationExtended has sensor calibration status */
+#define GPS_LOCATION_EXTENDED_HAS_CALIBRATION_STATUS     0x1000000000
+/** GpsLocationExtended has the engine type that produced this
+ *  position, the bit mask will only be set when there are two
+ *  or more position engines running in the system */
+#define GPS_LOCATION_EXTENDED_HAS_OUTPUT_ENG_TYPE       0x2000000000
+ /** GpsLocationExtended has the engine mask that indicates the
+  *     set of engines contribute to the fix. */
+#define GPS_LOCATION_EXTENDED_HAS_OUTPUT_ENG_MASK              0x4000000000
+/** GpsLocationExtended has dgnss correction source */
+#define GPS_LOCATION_EXTENDED_HAS_DGNSS_CORRECTION_SOURCE_TYPE 0x8000000000
+/** GpsLocationExtended has dgnss correction source ID */
+#define GPS_LOCATION_EXTENDED_HAS_DGNSS_CORRECTION_SOURCE_ID   0x10000000000
+/** GpsLocationExtended has dgnss constellation usage   */
+#define GPS_LOCATION_EXTENDED_HAS_DGNSS_CONSTELLATION_USAGE    0x20000000000
+/** GpsLocationExtended has dgnss ref station Id */
+#define GPS_LOCATION_EXTENDED_HAS_DGNSS_REF_STATION_ID         0x40000000000
+/** GpsLocationExtended has dgnss data age */
+#define GPS_LOCATION_EXTENDED_HAS_DGNSS_DATA_AGE               0x80000000000
+ /** GpsLocationExtended has the conformityIndex computed from
+  *  robust location feature. */
+#define GPS_LOCATION_EXTENDED_HAS_CONFORMITY_INDEX            0x100000000000
+ /** GpsLocationExtended has the llaVRPased. */
+#define GPS_LOCATION_EXTENDED_HAS_LLA_VRP_BASED                0x200000000000
+/** GpsLocationExtended has the velocityVRPased. */
+#define GPS_LOCATION_EXTENDED_HAS_ENU_VELOCITY_LLA_VRP_BASED   0x400000000000
+/** GpsLocationExtended has upperTriangleFullCovMatrix. */
+#define GPS_LOCATION_EXTENDED_HAS_UPPER_TRIANGLE_FULL_COV_MATRIX 0x800000000000
+/** GpsLocationExtended has drSolutionStatusMask. */
+#define GPS_LOCATION_EXTENDED_HAS_DR_SOLUTION_STATUS_MASK        0x1000000000000
+/** GpsLocationExtended has altitudeAssumed. */
+#define GPS_LOCATION_EXTENDED_HAS_ALTITUDE_ASSUMED               0x2000000000000
+
+typedef uint32_t LocNavSolutionMask;
+/* Bitmask to specify whether SBAS ionospheric correction is used  */
+#define LOC_NAV_MASK_SBAS_CORRECTION_IONO ((LocNavSolutionMask)0x0001)
+/* Bitmask to specify whether SBAS fast correction is used  */
+#define LOC_NAV_MASK_SBAS_CORRECTION_FAST ((LocNavSolutionMask)0x0002)
+/**<  Bitmask to specify whether SBAS long-tem correction is used  */
+#define LOC_NAV_MASK_SBAS_CORRECTION_LONG ((LocNavSolutionMask)0x0004)
+/**<  Bitmask to specify whether SBAS integrity information is used  */
+#define LOC_NAV_MASK_SBAS_INTEGRITY ((LocNavSolutionMask)0x0008)
+/**<  Bitmask to specify whether Position Report is DGNSS corrected  */
+#define LOC_NAV_MASK_DGNSS_CORRECTION ((LocNavSolutionMask)0x0010)
+/**<  Bitmask to specify whether Position Report is RTK corrected   */
+#define LOC_NAV_MASK_RTK_CORRECTION ((LocNavSolutionMask)0x0020)
+/**<  Bitmask to specify whether Position Report is PPP corrected   */
+#define LOC_NAV_MASK_PPP_CORRECTION ((LocNavSolutionMask)0x0040)
+/**<  Bitmask to specify whether Position Report is RTK fixed corrected   */
+#define LOC_NAV_MASK_RTK_FIXED_CORRECTION ((LocNavSolutionMask)0x0080)
+/**<  Bitmask specifying whether only SBAS corrected SVs are used for the fix */
+#define LOC_NAV_MASK_ONLY_SBAS_CORRECTED_SV_USED ((LocNavSolutionMask)0x0100)
+
+typedef uint32_t LocPosDataMask;
+/* Bitmask to specify whether Navigation data has Forward Acceleration  */
+#define LOC_NAV_DATA_HAS_LONG_ACCEL ((LocPosDataMask)0x0001)
+/* Bitmask to specify whether Navigation data has Sideward Acceleration */
+#define LOC_NAV_DATA_HAS_LAT_ACCEL ((LocPosDataMask)0x0002)
+/* Bitmask to specify whether Navigation data has Vertical Acceleration */
+#define LOC_NAV_DATA_HAS_VERT_ACCEL ((LocPosDataMask)0x0004)
+/* Bitmask to specify whether Navigation data has Heading Rate */
+#define LOC_NAV_DATA_HAS_YAW_RATE ((LocPosDataMask)0x0008)
+/* Bitmask to specify whether Navigation data has Body pitch */
+#define LOC_NAV_DATA_HAS_PITCH ((LocPosDataMask)0x0010)
+/* Bitmask to specify whether Navigation data has Forward Acceleration Unc  */
+#define LOC_NAV_DATA_HAS_LONG_ACCEL_UNC ((LocPosDataMask)0x0020)
+/* Bitmask to specify whether Navigation data has Sideward Acceleration Unc*/
+#define LOC_NAV_DATA_HAS_LAT_ACCEL_UNC ((LocPosDataMask)0x0040)
+/* Bitmask to specify whether Navigation data has Vertical Acceleration Unc*/
+#define LOC_NAV_DATA_HAS_VERT_ACCEL_UNC ((LocPosDataMask)0x0080)
+/* Bitmask to specify whether Navigation data has Heading Rate Unc*/
+#define LOC_NAV_DATA_HAS_YAW_RATE_UNC ((LocPosDataMask)0x0100)
+/* Bitmask to specify whether Navigation data has Body pitch Unc*/
+#define LOC_NAV_DATA_HAS_PITCH_UNC ((LocPosDataMask)0x0200)
+
+typedef uint32_t GnssAdditionalSystemInfoMask;
+/* Bitmask to specify whether Tauc is valid */
+#define GNSS_ADDITIONAL_SYSTEMINFO_HAS_TAUC ((GnssAdditionalSystemInfoMask)0x0001)
+/* Bitmask to specify whether leapSec is valid */
+#define GNSS_ADDITIONAL_SYSTEMINFO_HAS_LEAP_SEC ((GnssAdditionalSystemInfoMask)0x0002)
+
+
+/** GPS PRN Range */
+#define GPS_SV_PRN_MIN      1
+#define GPS_SV_PRN_MAX      32
+#define GLO_SV_PRN_MIN      65
+#define GLO_SV_PRN_MAX      96
+#define SBAS_SV_PRN_MIN     120
+#define SBAS_SV_PRN_MAX     191
+#define QZSS_SV_PRN_MIN     193
+#define QZSS_SV_PRN_MAX     197
+#define BDS_SV_PRN_MIN      201
+#define BDS_SV_PRN_MAX      263
+#define GAL_SV_PRN_MIN      301
+#define GAL_SV_PRN_MAX      336
+#define NAVIC_SV_PRN_MIN    401
+#define NAVIC_SV_PRN_MAX    414
+#define GLO_SV_PRN_SLOT_UNKNOWN 255
+
+/* Checking svIdOneBase can be set to the corresponding bit in mask */
+#define svFitsMask(mask, svIdOneBase)                 \
+    ((svIdOneBase) >= 1 && (svIdOneBase) <= (sizeof(mask) << 3))
+/* Setting svIdOneBase specific bit in the mask if the bit offset fits */
+#define setSvMask(mask, svIdOneBase)                  \
+    if (svFitsMask(mask, svIdOneBase)) mask |= (1ULL << ((svIdOneBase) - 1))
+
+#define isValInRangeInclusive(val, min, max) ((val) >= (min) && (val) <= (max))
+#define isGloSlotUnknown(val) ((val) == GLO_SV_PRN_SLOT_UNKNOWN)
+
+typedef enum {
+    LOC_RELIABILITY_NOT_SET = 0,
+    LOC_RELIABILITY_VERY_LOW = 1,
+    LOC_RELIABILITY_LOW = 2,
+    LOC_RELIABILITY_MEDIUM = 3,
+    LOC_RELIABILITY_HIGH = 4
+}LocReliability;
+
+typedef enum {
+    LOC_IN_EMERGENCY_UNKNOWN = 0,
+    LOC_IN_EMERGENCY_SET = 1,
+    LOC_IN_EMERGENCY_NOT_SET = 2
+}LocInEmergency;
+
+typedef struct {
+    struct timespec32_t apTimeStamp;
+    /*boottime received from pps-ktimer*/
+    float apTimeStampUncertaintyMs;
+    /* timestamp uncertainty in milli seconds */
+}Gnss_ApTimeStampStructType;
+
+typedef struct {
+    uint64_t gps_sv_used_ids_mask;
+    uint64_t glo_sv_used_ids_mask;
+    uint64_t gal_sv_used_ids_mask;
+    uint64_t bds_sv_used_ids_mask;
+    uint64_t qzss_sv_used_ids_mask;
+    uint64_t navic_sv_used_ids_mask;
+} GnssSvUsedInPosition;
+
+typedef struct {
+    uint64_t gps_l1ca_sv_used_ids_mask;     // GPS L1CA
+    uint64_t gps_l1c_sv_used_ids_mask;      // GPS L1C
+    uint64_t gps_l2_sv_used_ids_mask;       // GPS L2
+    uint64_t gps_l5_sv_used_ids_mask;       // GPS L5
+    uint64_t glo_g1_sv_used_ids_mask;       // GLO G1
+    uint64_t glo_g2_sv_used_ids_mask;       // GLO G2
+    uint64_t gal_e1_sv_used_ids_mask;       // GAL E1
+    uint64_t gal_e5a_sv_used_ids_mask;      // GAL E5A
+    uint64_t gal_e5b_sv_used_ids_mask;      // GAL E5B
+    uint64_t bds_b1i_sv_used_ids_mask;      // BDS B1I
+    uint64_t bds_b1c_sv_used_ids_mask;      // BDS B1C
+    uint64_t bds_b2i_sv_used_ids_mask;      // BDS B2I
+    uint64_t bds_b2ai_sv_used_ids_mask;     // BDS B2AI
+    uint64_t qzss_l1ca_sv_used_ids_mask;    // QZSS L1CA
+    uint64_t qzss_l1s_sv_used_ids_mask;     // QZSS L1S
+    uint64_t qzss_l2_sv_used_ids_mask;      // QZSS L2
+    uint64_t qzss_l5_sv_used_ids_mask;      // QZSS L5
+    uint64_t sbas_l1_sv_used_ids_mask;      // SBAS L1
+    uint64_t bds_b2aq_sv_used_ids_mask;     // BDS B2AQ
+} GnssSvMbUsedInPosition;
+
+/* Body Frame parameters */
+typedef struct {
+    /** Contains Body frame LocPosDataMask bits. */
+   uint32_t        bodyFrameDatamask;
+   /* Forward Acceleration in body frame (m/s2)*/
+   float           longAccel;
+   /** Uncertainty of Forward Acceleration in body frame */
+   float           longAccelUnc;
+   /* Sideward Acceleration in body frame (m/s2)*/
+   float           latAccel;
+   /** Uncertainty of Side-ward Acceleration in body frame */
+   float           latAccelUnc;
+   /* Vertical Acceleration in body frame (m/s2)*/
+   float           vertAccel;
+   /** Uncertainty of Vertical Acceleration in body frame */
+   float           vertAccelUnc;
+   /* Heading Rate (Radians/second) */
+   float           yawRate;
+   /** Uncertainty of Heading Rate */
+   float           yawRateUnc;
+   /* Body pitch (Radians) */
+   float           pitch;
+   /** Uncertainty of Body pitch */
+   float           pitchRadUnc;
+}LocPositionDynamics;
+
+typedef struct {
+
+  /**  Position dilution of precision.
+       Range: 1 (highest accuracy) to 50 (lowest accuracy) */
+  float PDOP;
+
+  /**  Horizontal dilution of precision.
+       Range: 1 (highest accuracy) to 50 (lowest accuracy) */
+  float HDOP;
+
+  /**  Vertical dilution of precision.
+       Range: 1 (highest accuracy) to 50 (lowest accuracy) */
+  float VDOP;
+
+  /**  geometric  dilution of precision.
+       Range: 1 (highest accuracy) to 50 (lowest accuracy) */
+  float GDOP;
+
+  /**  time dilution of precision.
+       Range: 1 (highest accuracy) to 50 (lowest accuracy) */
+  float TDOP;
+}LocExtDOP;
+
+/* GPS Time structure */
+typedef struct {
+
+  /**<   Current GPS week as calculated from midnight, Jan. 6, 1980. \n
+       - Units: Weeks */
+  uint16_t gpsWeek;
+
+  /**<   Amount of time into the current GPS week. \n
+       - Units: Milliseconds */
+  uint32_t gpsTimeOfWeekMs;
+}GPSTimeStruct;
+
+typedef uint8_t CarrierPhaseAmbiguityType;
+#define CARRIER_PHASE_AMBIGUITY_RESOLUTION_NONE ((CarrierPhaseAmbiguityType)0)
+#define CARRIER_PHASE_AMBIGUITY_RESOLUTION_FLOAT ((CarrierPhaseAmbiguityType)1)
+#define CARRIER_PHASE_AMBIGUITY_RESOLUTION_FIXED ((CarrierPhaseAmbiguityType)2)
+
+
+typedef enum {
+  LOC_DGNSS_CORR_SOURCE_TYPE_INVALID = 0, /**<  Invalid DGNSS correction source type \n */
+  LOC_DGNSS_CORR_SOURCE_TYPE_RTCM = 1, /**<  DGNSS correction source type RTCM \n */
+  LOC_DGNSS_CORR_SOURCE_TYPE_3GPP = 2, /**<  DGNSS correction source type 3GPP \n */
+}LocDgnssCorrectionSourceType;
+
+typedef uint16_t GnssMeasUsageStatusBitMask;
+/** Used in fix */
+#define GNSS_MEAS_USED_IN_PVT ((GnssMeasUsageStatusBitMask)0x00000001ul)
+/** Measurement is Bad */
+#define GNSS_MEAS_USAGE_STATUS_BAD_MEAS ((GnssMeasUsageStatusBitMask)0x00000002ul)
+/** Measurement has too low C/N */
+#define GNSS_MEAS_USAGE_STATUS_CNO_TOO_LOW ((GnssMeasUsageStatusBitMask)0x00000004ul)
+/** Measurement has too low elevation */
+#define GNSS_MEAS_USAGE_STATUS_ELEVATION_TOO_LOW ((GnssMeasUsageStatusBitMask)0x00000008ul)
+/** No ephemeris available for this measurement */
+#define GNSS_MEAS_USAGE_STATUS_NO_EPHEMERIS ((GnssMeasUsageStatusBitMask)0x00000010ul)
+/** No corrections available for the measurement */
+#define GNSS_MEAS_USAGE_STATUS_NO_CORRECTIONS ((GnssMeasUsageStatusBitMask)0x00000020ul)
+/** Corrections has timed out for the measurement */
+#define GNSS_MEAS_USAGE_STATUS_CORRECTION_TIMEOUT ((GnssMeasUsageStatusBitMask)0x00000040ul)
+/** Measurement is unhealthy */
+#define GNSS_MEAS_USAGE_STATUS_UNHEALTHY ((GnssMeasUsageStatusBitMask)0x00000080ul)
+/** Configuration is disabled for this measurement */
+#define GNSS_MEAS_USAGE_STATUS_CONFIG_DISABLED ((GnssMeasUsageStatusBitMask)0x00000100ul)
+/** Measurement not used for other reasons */
+#define GNSS_MEAS_USAGE_STATUS_OTHER ((GnssMeasUsageStatusBitMask)0x00000200ul)
+
+/** Flags to indicate valid fields in epMeasUsageInfo */
+typedef uint16_t GnssMeasUsageInfoValidityMask;
+#define GNSS_PSEUDO_RANGE_RESIDUAL_VALID        ((GnssMeasUsageInfoValidityMask)0x00000001ul)
+#define GNSS_DOPPLER_RESIDUAL_VALID             ((GnssMeasUsageInfoValidityMask)0x00000002ul)
+#define GNSS_CARRIER_PHASE_RESIDUAL_VALID       ((GnssMeasUsageInfoValidityMask)0x00000004ul)
+#define GNSS_CARRIER_PHASE_AMBIGUITY_TYPE_VALID ((GnssMeasUsageInfoValidityMask)0x00000008ul)
+
+typedef uint16_t GnssSvPolyStatusMask;
+#define GNSS_SV_POLY_SRC_ALM_CORR_V02 ((GnssSvPolyStatusMask)0x01)
+#define GNSS_SV_POLY_GLO_STR4_V02 ((GnssSvPolyStatusMask)0x02)
+#define GNSS_SV_POLY_DELETE_V02 ((GnssSvPolyStatusMask)0x04)
+#define GNSS_SV_POLY_SRC_GAL_FNAV_OR_INAV_V02 ((GnssSvPolyStatusMask)0x08)
+typedef uint16_t GnssSvPolyStatusMaskValidity;
+#define GNSS_SV_POLY_SRC_ALM_CORR_VALID_V02 ((GnssSvPolyStatusMaskValidity)0x01)
+#define GNSS_SV_POLY_GLO_STR4_VALID_V02 ((GnssSvPolyStatusMaskValidity)0x02)
+#define GNSS_SV_POLY_DELETE_VALID_V02 ((GnssSvPolyStatusMaskValidity)0x04)
+#define GNSS_SV_POLY_SRC_GAL_FNAV_OR_INAV_VALID_V02 ((GnssSvPolyStatusMaskValidity)0x08)
+
+typedef struct {
+    /** Specifies GNSS signal type
+        Mandatory Field*/
+    GnssSignalTypeMask gnssSignalType;
+    /** Specifies GNSS Constellation Type
+        Mandatory Field*/
+    Gnss_LocSvSystemEnumType gnssConstellation;
+    /**  Unique SV Identifier.
+     *   SV Range for supported constellation is specified as below:
+     *    - For GPS:     1 to 32
+     *    - For GLONASS: 65 to 96
+     *    - For SBAS:    120 to 158 and 183 to 191
+     *    - For QZSS:    193 to 197
+     *    - For BDS:     201 to 263
+     *    - For GAL:     301 to 336
+     *    - For NAVIC:   401 to 414 */
+    uint16_t gnssSvId;
+    /** GLONASS frequency number + 7.
+        Valid only for a GLONASS system and
+        is to be ignored for all other systems.
+        Range: 1 to 14 */
+    uint8_t gloFrequency;
+    /** Carrier phase ambiguity type. */
+    CarrierPhaseAmbiguityType carrierPhaseAmbiguityType;
+    /** Validity mask */
+    GnssMeasUsageStatusBitMask measUsageStatusMask;
+    /** Specifies measurement usage status
+        Mandatory Field*/
+    GnssMeasUsageInfoValidityMask validityMask;
+    /** Computed pseudorange residual.
+        Unit: Meters */
+    float pseudorangeResidual;
+    /** Computed doppler residual.
+        Unit: Meters/sec*/
+    float dopplerResidual;
+    /** Computed carrier phase residual.
+        Unit: Cycles*/
+    float carrierPhaseResidual;
+    /** Carrier phase ambiguity value.
+        Unit: Cycles*/
+    float carrierPhasAmbiguity;
+} GpsMeasUsageInfo;
+
+#define COV_MATRIX_SIZE 12
+/** Represents gps location extended. */
+typedef struct {
+    /** set to sizeof(GpsLocationExtended) */
+    uint32_t          size;
+    /** Contains GpsLocationExtendedFlags bits. */
+    uint64_t        flags;
+    /** Contains the Altitude wrt mean sea level */
+    float           altitudeMeanSeaLevel;
+    /** Contains Position Dilusion of Precision. */
+    float           pdop;
+    /** Contains Horizontal Dilusion of Precision. */
+    float           hdop;
+    /** Contains Vertical Dilusion of Precision. */
+    float           vdop;
+    /** Contains Magnetic Deviation. */
+    float           magneticDeviation;
+    /** vertical uncertainty in meters */
+    float           vert_unc;
+    /** speed uncertainty in m/s */
+    float           speed_unc;
+    /** heading uncertainty in degrees (0 to 359.999) */
+    float           bearing_unc;
+    /** horizontal reliability. */
+    LocReliability  horizontal_reliability;
+    /** vertical reliability. */
+    LocReliability  vertical_reliability;
+    /*  Horizontal Elliptical Uncertainty (Semi-Major Axis) */
+    float           horUncEllipseSemiMajor;
+    /*  Horizontal Elliptical Uncertainty (Semi-Minor Axis) */
+    float           horUncEllipseSemiMinor;
+    /*    Elliptical Horizontal Uncertainty Azimuth */
+    float           horUncEllipseOrientAzimuth;
+
+    Gnss_ApTimeStampStructType               timeStamp;
+    /** Gnss sv used in position data */
+    GnssSvUsedInPosition gnss_sv_used_ids;
+    /** Gnss sv used in position data for multiband */
+    GnssSvMbUsedInPosition gnss_mb_sv_used_ids;
+    /** Nav solution mask to indicate sbas corrections */
+    LocNavSolutionMask  navSolutionMask;
+    /** Position technology used in computing this fix */
+    LocPosTechMask tech_mask;
+    /** SV Info source used in computing this fix */
+    LocSvInfoSource sv_source;
+    /** Body Frame Dynamics: 4wayAcceleration and pitch set with validity */
+    GnssLocationPositionDynamics bodyFrameData;
+    /** GPS Time */
+    GPSTimeStruct gpsTime;
+    GnssSystemTime gnssSystemTime;
+    /** Dilution of precision associated with this position*/
+    LocExtDOP extDOP;
+    /** North standard deviation.
+        Unit: Meters */
+    float northStdDeviation;
+    /** East standard deviation.
+        Unit: Meters */
+    float eastStdDeviation;
+    /** North Velocity.
+        Unit: Meters/sec */
+    float northVelocity;
+    /** East Velocity.
+        Unit: Meters/sec */
+    float eastVelocity;
+    /** Up Velocity.
+        Unit: Meters/sec */
+    float upVelocity;
+    /** North Velocity standard deviation.
+        Unit: Meters/sec */
+    float northVelocityStdDeviation;
+    /** East Velocity standard deviation.
+        Unit: Meters/sec */
+    float eastVelocityStdDeviation;
+    /** Up Velocity standard deviation
+        Unit: Meters/sec */
+    float upVelocityStdDeviation;
+    /** Estimated clock bias. Unit: Nano seconds */
+    float clockbiasMeter;
+    /** Estimated clock bias std deviation. Unit: Nano seconds */
+    float clockBiasStdDeviationMeter;
+    /** Estimated clock drift. Unit: Meters/sec */
+    float clockDrift;
+    /** Estimated clock drift std deviation. Unit: Meters/sec */
+    float clockDriftStdDeviation;
+    /** Number of valid reference stations. Range:[0-4] */
+    uint8_t numValidRefStations;
+    /** Reference station(s) number */
+    uint16_t referenceStation[4];
+    /** Number of measurements received for use in fix.
+        Shall be used as maximum index in-to svUsageInfo[].
+        Set to 0, if svUsageInfo reporting is not supported.
+        Range: 0-EP_GNSS_MAX_MEAS */
+    uint8_t numOfMeasReceived;
+    /** Measurement Usage Information */
+    GpsMeasUsageInfo measUsageInfo[GNSS_SV_MAX];
+    /** Leap Seconds */
+    uint8_t leapSeconds;
+    /** Time uncertainty in milliseconds   */
+    float timeUncMs;
+    /** Heading Rate is in NED frame.
+        Range: 0 to 359.999. 946
+        Unit: Degrees per Seconds */
+    float headingRateDeg;
+    /** Sensor calibration confidence percent. Range: 0 - 100 */
+    uint8_t calibrationConfidence;
+    DrCalibrationStatusMask calibrationStatus;
+    /** location engine type. When the fix. when the type is set to
+        LOC_ENGINE_SRC_FUSED, the fix is the propagated/aggregated
+        reports from all engines running on the system (e.g.:
+        DR/SPE/PPE). To check which location engine contributes to
+        the fused output, check for locOutputEngMask. */
+    LocOutputEngineType locOutputEngType;
+    /** when loc output eng type is set to fused, this field
+        indicates the set of engines contribute to the fix. */
+    PositioningEngineMask locOutputEngMask;
+
+    /**  DGNSS Correction Source for position report: RTCM, 3GPP
+     *   etc. */
+    LocDgnssCorrectionSourceType dgnssCorrectionSourceType;
+
+    /**  If DGNSS is used, the SourceID is a 32bit number identifying
+     *   the DGNSS source ID */
+    uint32_t dgnssCorrectionSourceID;
+
+    /** If DGNSS is used, which constellation was DGNSS used for to
+     *  produce the pos report. */
+    GnssConstellationTypeMask dgnssConstellationUsage;
+
+    /** If DGNSS is used, DGNSS Reference station ID used for
+     *  position report */
+    uint16_t dgnssRefStationId;
+
+    /**  If DGNSS is used, DGNSS data age in milli-seconds  */
+    uint32_t dgnssDataAgeMsec;
+
+    /** When robust location is enabled, this field
+     * will how well the various input data considered for
+     * navigation solution conform to expectations.
+     * Range: 0 (least conforming) to 1 (most conforming) */
+    float conformityIndex;
+    GnssLocationPositionDynamicsExt bodyFrameDataExt;
+    /** VRR-based latitude/longitude/altitude */
+    LLAInfo llaVRPBased;
+    /** VRR-based east, north, and up velocity */
+    float enuVelocityVRPBased[3];
+    /** Upper triangle elements of full matrix of position and
+        velocity estimate in ECEF
+
+         The full covariance matrix of PPE position
+         (x, y, z in ECEF, in the unit of meters) estimate is a 3x3 matrix
+            | px,x  px,y  px,z |
+            | py,x  py,y  py,z |
+            | pz,x  pz,y  pz,z |
+
+         The full covariance matrix of PPE velocity
+         (vx,vy, vz in ECEF, in the unit of m/s) estimate is a 3x3 matrix
+            | pvx,vx  pvx,vy  pvx,vz |
+            | pvy,vx  pvy,vy  pvy,vz |
+            | pvz,vx  pvz,vy  pvz,vz |
+
+        upperTriangleFullCovMatrix =
+          { px,x, px,y, px,z, py,y, py,z, pz,z, pvx,vx, pvx,vy, pvx,vz, pvy,vy, pvy,vz, pvz,vz}
+        Uint: px,x, px,y, px,z, py,y, py,z, pz,z is in meter
+              pvx,vx, pvx,vy, pvx,vz, pvy,vy, pvy,vz, pvz,vz is in meters/seconds
+    */
+    float upperTriangleFullCovMatrix[COV_MATRIX_SIZE];
+    DrSolutionStatusMask drSolutionStatusMask;
+    /** When this field is valid, it will indicates whether altitude
+     *  is assumed or calculated.
+     *  false: Altitude is calculated.
+     *  true:  Altitude is assumed; there may not be enough
+     *         satellites to determine the precise altitude. */
+    bool altitudeAssumed;
+} GpsLocationExtended;
+
+// struct that contains complete position info from engine
+typedef struct {
+    UlpLocation location;
+    GpsLocationExtended locationExtended;
+    enum loc_sess_status sessionStatus;
+} EngineLocationInfo;
+
+// Nmea sentence types mask
+typedef uint32_t NmeaSentenceTypesMask;
+#define LOC_NMEA_MASK_GGA_V02   ((NmeaSentenceTypesMask)0x00000001) /**<  Enable GGA type  */
+#define LOC_NMEA_MASK_RMC_V02   ((NmeaSentenceTypesMask)0x00000002) /**<  Enable RMC type  */
+#define LOC_NMEA_MASK_GSV_V02   ((NmeaSentenceTypesMask)0x00000004) /**<  Enable GSV type  */
+#define LOC_NMEA_MASK_GSA_V02   ((NmeaSentenceTypesMask)0x00000008) /**<  Enable GSA type  */
+#define LOC_NMEA_MASK_VTG_V02   ((NmeaSentenceTypesMask)0x00000010) /**<  Enable VTG type  */
+#define LOC_NMEA_MASK_PQXFI_V02 ((NmeaSentenceTypesMask)0x00000020) /**<  Enable PQXFI type  */
+#define LOC_NMEA_MASK_PSTIS_V02 ((NmeaSentenceTypesMask)0x00000040) /**<  Enable PSTIS type  */
+#define LOC_NMEA_MASK_GLGSV_V02 ((NmeaSentenceTypesMask)0x00000080) /**<  Enable GLGSV type  */
+#define LOC_NMEA_MASK_GNGSA_V02 ((NmeaSentenceTypesMask)0x00000100) /**<  Enable GNGSA type  */
+#define LOC_NMEA_MASK_GNGNS_V02 ((NmeaSentenceTypesMask)0x00000200) /**<  Enable GNGNS type  */
+#define LOC_NMEA_MASK_GARMC_V02 ((NmeaSentenceTypesMask)0x00000400) /**<  Enable GARMC type  */
+#define LOC_NMEA_MASK_GAGSV_V02 ((NmeaSentenceTypesMask)0x00000800) /**<  Enable GAGSV type  */
+#define LOC_NMEA_MASK_GAGSA_V02 ((NmeaSentenceTypesMask)0x00001000) /**<  Enable GAGSA type  */
+#define LOC_NMEA_MASK_GAVTG_V02 ((NmeaSentenceTypesMask)0x00002000) /**<  Enable GAVTG type  */
+#define LOC_NMEA_MASK_GAGGA_V02 ((NmeaSentenceTypesMask)0x00004000) /**<  Enable GAGGA type  */
+#define LOC_NMEA_MASK_PQGSA_V02 ((NmeaSentenceTypesMask)0x00008000) /**<  Enable PQGSA type  */
+#define LOC_NMEA_MASK_PQGSV_V02 ((NmeaSentenceTypesMask)0x00010000) /**<  Enable PQGSV type  */
+#define LOC_NMEA_MASK_DEBUG_V02 ((NmeaSentenceTypesMask)0x00020000) /**<  Enable DEBUG type  */
+#define LOC_NMEA_MASK_GPDTM_V02 ((NmeaSentenceTypesMask)0x00040000) /**<  Enable GPDTM type  */
+#define LOC_NMEA_MASK_GNGGA_V02 ((NmeaSentenceTypesMask)0x00080000) /**<  Enable GNGGA type  */
+#define LOC_NMEA_MASK_GNRMC_V02 ((NmeaSentenceTypesMask)0x00100000) /**<  Enable GNRMC type  */
+#define LOC_NMEA_MASK_GNVTG_V02 ((NmeaSentenceTypesMask)0x00200000) /**<  Enable GNVTG type  */
+#define LOC_NMEA_MASK_GAGNS_V02 ((NmeaSentenceTypesMask)0x00400000) /**<  Enable GAGNS type  */
+#define LOC_NMEA_MASK_GBGGA_V02 ((NmeaSentenceTypesMask)0x00800000) /**<  Enable GBGGA type  */
+#define LOC_NMEA_MASK_GBGSA_V02 ((NmeaSentenceTypesMask)0x01000000) /**<  Enable GBGSA type  */
+#define LOC_NMEA_MASK_GBGSV_V02 ((NmeaSentenceTypesMask)0x02000000) /**<  Enable GBGSV type  */
+#define LOC_NMEA_MASK_GBRMC_V02 ((NmeaSentenceTypesMask)0x04000000) /**<  Enable GBRMC type  */
+#define LOC_NMEA_MASK_GBVTG_V02 ((NmeaSentenceTypesMask)0x08000000) /**<  Enable GBVTG type  */
+#define LOC_NMEA_MASK_GQGSV_V02 ((NmeaSentenceTypesMask)0x10000000) /**<  Enable GQGSV type  */
+#define LOC_NMEA_MASK_GIGSV_V02 ((NmeaSentenceTypesMask)0x20000000) /**<  Enable GIGSV type  */
+#define LOC_NMEA_MASK_GNDTM_V02 ((NmeaSentenceTypesMask)0x40000000) /**<  Enable GNDTM type  */
+#define LOC_NMEA_MASK_TAGBLOCK_V02 ((NmeaSentenceTypesMask)0x80000000) /**< Enable TAGBLOCK type */
+
+
+// all bitmasks of general supported NMEA sentenses - debug is not part of this
+#define LOC_NMEA_ALL_GENERAL_SUPPORTED_MASK  (LOC_NMEA_MASK_GGA_V02 | LOC_NMEA_MASK_RMC_V02 | \
+              LOC_NMEA_MASK_GSV_V02 | LOC_NMEA_MASK_GSA_V02 | LOC_NMEA_MASK_VTG_V02 | \
+        LOC_NMEA_MASK_PQXFI_V02 | LOC_NMEA_MASK_PSTIS_V02 | LOC_NMEA_MASK_GLGSV_V02 | \
+        LOC_NMEA_MASK_GNGSA_V02 | LOC_NMEA_MASK_GNGNS_V02 | LOC_NMEA_MASK_GARMC_V02 | \
+        LOC_NMEA_MASK_GAGSV_V02 | LOC_NMEA_MASK_GAGSA_V02 | LOC_NMEA_MASK_GAVTG_V02 | \
+        LOC_NMEA_MASK_GAGGA_V02 | LOC_NMEA_MASK_PQGSA_V02 | LOC_NMEA_MASK_PQGSV_V02 | \
+        LOC_NMEA_MASK_GPDTM_V02 | LOC_NMEA_MASK_GNGGA_V02 | LOC_NMEA_MASK_GNRMC_V02 | \
+        LOC_NMEA_MASK_GNVTG_V02 | LOC_NMEA_MASK_GAGNS_V02 | LOC_NMEA_MASK_GBGGA_V02 | \
+        LOC_NMEA_MASK_GBGSA_V02 | LOC_NMEA_MASK_GBGSV_V02 | LOC_NMEA_MASK_GBRMC_V02 | \
+        LOC_NMEA_MASK_GBVTG_V02 | LOC_NMEA_MASK_GQGSV_V02 | LOC_NMEA_MASK_GIGSV_V02 | \
+        LOC_NMEA_MASK_GNDTM_V02)
+
+typedef enum {
+  LOC_ENG_IF_REQUEST_SENDER_ID_QUIPC = 0,
+  LOC_ENG_IF_REQUEST_SENDER_ID_MSAPM,
+  LOC_ENG_IF_REQUEST_SENDER_ID_MSAPU,
+  LOC_ENG_IF_REQUEST_SENDER_ID_GPSONE_DAEMON,
+  LOC_ENG_IF_REQUEST_SENDER_ID_MODEM,
+  LOC_ENG_IF_REQUEST_SENDER_ID_UNKNOWN
+} loc_if_req_sender_id_e_type;
+
+
+#define smaller_of(a, b) (((a) > (b)) ? (b) : (a))
+#define MAX_APN_LEN 100
+
+// This will be overridden by the individual adapters
+// if necessary.
+#define DEFAULT_IMPL(rtv)                                     \
+{                                                             \
+    LOC_LOGD("%s: default implementation invoked", __func__); \
+    return rtv;                                               \
+}
+
+enum loc_api_adapter_err {
+    LOC_API_ADAPTER_ERR_SUCCESS             = 0,
+    LOC_API_ADAPTER_ERR_GENERAL_FAILURE     = 1,
+    LOC_API_ADAPTER_ERR_UNSUPPORTED         = 2,
+    LOC_API_ADAPTER_ERR_INVALID_HANDLE      = 4,
+    LOC_API_ADAPTER_ERR_INVALID_PARAMETER   = 5,
+    LOC_API_ADAPTER_ERR_ENGINE_BUSY         = 6,
+    LOC_API_ADAPTER_ERR_PHONE_OFFLINE       = 7,
+    LOC_API_ADAPTER_ERR_TIMEOUT             = 8,
+    LOC_API_ADAPTER_ERR_SERVICE_NOT_PRESENT = 9,
+    LOC_API_ADAPTER_ERR_INTERNAL            = 10,
+
+    /* equating engine down to phone offline, as they are the same errror */
+    LOC_API_ADAPTER_ERR_ENGINE_DOWN         = LOC_API_ADAPTER_ERR_PHONE_OFFLINE,
+    LOC_API_ADAPTER_ERR_FAILURE             = 101,
+    LOC_API_ADAPTER_ERR_UNKNOWN
+};
+
+enum loc_api_adapter_event_index {
+    LOC_API_ADAPTER_REPORT_POSITION = 0,               // Position report comes in loc_parsed_position_s_type
+    LOC_API_ADAPTER_REPORT_SATELLITE,                  // Satellite in view report
+    LOC_API_ADAPTER_REPORT_NMEA_1HZ,                   // NMEA report at 1HZ rate
+    LOC_API_ADAPTER_REPORT_NMEA_POSITION,              // NMEA report at position report rate
+    LOC_API_ADAPTER_REQUEST_NI_NOTIFY_VERIFY,          // NI notification/verification request
+    LOC_API_ADAPTER_REQUEST_ASSISTANCE_DATA,           // Assistance data, eg: time, predicted orbits request
+    LOC_API_ADAPTER_REQUEST_LOCATION_SERVER,           // Request for location server
+    LOC_API_ADAPTER_REPORT_IOCTL,                      // Callback report for loc_ioctl
+    LOC_API_ADAPTER_REPORT_STATUS,                     // Misc status report: eg, engine state
+    LOC_API_ADAPTER_REQUEST_WIFI,                      //
+    LOC_API_ADAPTER_SENSOR_STATUS,                     //
+    LOC_API_ADAPTER_REQUEST_TIME_SYNC,                 //
+    LOC_API_ADAPTER_REPORT_SPI,                        //
+    LOC_API_ADAPTER_REPORT_NI_GEOFENCE,                //
+    LOC_API_ADAPTER_GEOFENCE_GEN_ALERT,                //
+    LOC_API_ADAPTER_REPORT_GENFENCE_BREACH,            //
+    LOC_API_ADAPTER_PEDOMETER_CTRL,                    //
+    LOC_API_ADAPTER_MOTION_CTRL,                       //
+    LOC_API_ADAPTER_REQUEST_WIFI_AP_DATA,              // Wifi ap data
+    LOC_API_ADAPTER_BATCH_FULL,                        // Batching on full
+    LOC_API_ADAPTER_BATCHED_POSITION_REPORT,           // Batching on fix
+    LOC_API_ADAPTER_BATCHED_GENFENCE_BREACH_REPORT,    //
+    LOC_API_ADAPTER_GNSS_MEASUREMENT_REPORT,           // GNSS Measurement Report
+    LOC_API_ADAPTER_GNSS_SV_POLYNOMIAL_REPORT,         // GNSS SV Polynomial Report
+    LOC_API_ADAPTER_GDT_UPLOAD_BEGIN_REQ,              // GDT upload start request
+    LOC_API_ADAPTER_GDT_UPLOAD_END_REQ,                // GDT upload end request
+    LOC_API_ADAPTER_GNSS_MEASUREMENT,                  // GNSS Measurement report
+    LOC_API_ADAPTER_REQUEST_TIMEZONE,                  // Timezone injection request
+    LOC_API_ADAPTER_REPORT_GENFENCE_DWELL_REPORT,      // Geofence dwell report
+    LOC_API_ADAPTER_REQUEST_SRN_DATA,                  // request srn data from AP
+    LOC_API_ADAPTER_REQUEST_POSITION_INJECTION,        // Position injection request
+    LOC_API_ADAPTER_BATCH_STATUS,                      // batch status
+    LOC_API_ADAPTER_FDCL_SERVICE_REQ,                  // FDCL service request
+    LOC_API_ADAPTER_REPORT_UNPROPAGATED_POSITION,      // Unpropagated Position report
+    LOC_API_ADAPTER_BS_OBS_DATA_SERVICE_REQ,           // BS observation data request
+    LOC_API_ADAPTER_GNSS_SV_EPHEMERIS_REPORT,          // GNSS SV Ephemeris Report
+    LOC_API_ADAPTER_LOC_SYSTEM_INFO,                   // Location system info event
+    LOC_API_ADAPTER_GNSS_NHZ_MEASUREMENT_REPORT,       // GNSS SV nHz measurement report
+    LOC_API_ADAPTER_EVENT_REPORT_INFO,                 // Event report info
+    LOC_API_ADAPTER_LATENCY_INFORMATION_REPORT,       // Latency information report
+    LOC_API_ADAPTER_EVENT_MAX
+};
+
+#define LOC_API_ADAPTER_BIT_PARSED_POSITION_REPORT           (1ULL<<LOC_API_ADAPTER_REPORT_POSITION)
+#define LOC_API_ADAPTER_BIT_SATELLITE_REPORT                 (1ULL<<LOC_API_ADAPTER_REPORT_SATELLITE)
+#define LOC_API_ADAPTER_BIT_NMEA_1HZ_REPORT                  (1ULL<<LOC_API_ADAPTER_REPORT_NMEA_1HZ)
+#define LOC_API_ADAPTER_BIT_NMEA_POSITION_REPORT             (1ULL<<LOC_API_ADAPTER_REPORT_NMEA_POSITION)
+#define LOC_API_ADAPTER_BIT_NI_NOTIFY_VERIFY_REQUEST         (1ULL<<LOC_API_ADAPTER_REQUEST_NI_NOTIFY_VERIFY)
+#define LOC_API_ADAPTER_BIT_ASSISTANCE_DATA_REQUEST          (1ULL<<LOC_API_ADAPTER_REQUEST_ASSISTANCE_DATA)
+#define LOC_API_ADAPTER_BIT_LOCATION_SERVER_REQUEST          (1ULL<<LOC_API_ADAPTER_REQUEST_LOCATION_SERVER)
+#define LOC_API_ADAPTER_BIT_IOCTL_REPORT                     (1ULL<<LOC_API_ADAPTER_REPORT_IOCTL)
+#define LOC_API_ADAPTER_BIT_STATUS_REPORT                    (1ULL<<LOC_API_ADAPTER_REPORT_STATUS)
+#define LOC_API_ADAPTER_BIT_REQUEST_WIFI                     (1ULL<<LOC_API_ADAPTER_REQUEST_WIFI)
+#define LOC_API_ADAPTER_BIT_SENSOR_STATUS                    (1ULL<<LOC_API_ADAPTER_SENSOR_STATUS)
+#define LOC_API_ADAPTER_BIT_REQUEST_TIME_SYNC                (1ULL<<LOC_API_ADAPTER_REQUEST_TIME_SYNC)
+#define LOC_API_ADAPTER_BIT_REPORT_SPI                       (1ULL<<LOC_API_ADAPTER_REPORT_SPI)
+#define LOC_API_ADAPTER_BIT_REPORT_NI_GEOFENCE               (1ULL<<LOC_API_ADAPTER_REPORT_NI_GEOFENCE)
+#define LOC_API_ADAPTER_BIT_GEOFENCE_GEN_ALERT               (1ULL<<LOC_API_ADAPTER_GEOFENCE_GEN_ALERT)
+#define LOC_API_ADAPTER_BIT_REPORT_GENFENCE_BREACH           (1ULL<<LOC_API_ADAPTER_REPORT_GENFENCE_BREACH)
+#define LOC_API_ADAPTER_BIT_BATCHED_GENFENCE_BREACH_REPORT   (1ULL<<LOC_API_ADAPTER_BATCHED_GENFENCE_BREACH_REPORT)
+#define LOC_API_ADAPTER_BIT_PEDOMETER_CTRL                   (1ULL<<LOC_API_ADAPTER_PEDOMETER_CTRL)
+#define LOC_API_ADAPTER_BIT_MOTION_CTRL                      (1ULL<<LOC_API_ADAPTER_MOTION_CTRL)
+#define LOC_API_ADAPTER_BIT_REQUEST_WIFI_AP_DATA             (1ULL<<LOC_API_ADAPTER_REQUEST_WIFI_AP_DATA)
+#define LOC_API_ADAPTER_BIT_BATCH_FULL                       (1ULL<<LOC_API_ADAPTER_BATCH_FULL)
+#define LOC_API_ADAPTER_BIT_BATCHED_POSITION_REPORT          (1ULL<<LOC_API_ADAPTER_BATCHED_POSITION_REPORT)
+#define LOC_API_ADAPTER_BIT_GNSS_MEASUREMENT_REPORT          (1ULL<<LOC_API_ADAPTER_GNSS_MEASUREMENT_REPORT)
+#define LOC_API_ADAPTER_BIT_GNSS_SV_POLYNOMIAL_REPORT        (1ULL<<LOC_API_ADAPTER_GNSS_SV_POLYNOMIAL_REPORT)
+#define LOC_API_ADAPTER_BIT_GDT_UPLOAD_BEGIN_REQ             (1ULL<<LOC_API_ADAPTER_GDT_UPLOAD_BEGIN_REQ)
+#define LOC_API_ADAPTER_BIT_GDT_UPLOAD_END_REQ               (1ULL<<LOC_API_ADAPTER_GDT_UPLOAD_END_REQ)
+#define LOC_API_ADAPTER_BIT_GNSS_MEASUREMENT                 (1ULL<<LOC_API_ADAPTER_GNSS_MEASUREMENT)
+#define LOC_API_ADAPTER_BIT_REQUEST_TIMEZONE                 (1ULL<<LOC_API_ADAPTER_REQUEST_TIMEZONE)
+#define LOC_API_ADAPTER_BIT_REPORT_GENFENCE_DWELL            (1ULL<<LOC_API_ADAPTER_REPORT_GENFENCE_DWELL_REPORT)
+#define LOC_API_ADAPTER_BIT_REQUEST_SRN_DATA                 (1ULL<<LOC_API_ADAPTER_REQUEST_SRN_DATA)
+#define LOC_API_ADAPTER_BIT_POSITION_INJECTION_REQUEST       (1ULL<<LOC_API_ADAPTER_REQUEST_POSITION_INJECTION)
+#define LOC_API_ADAPTER_BIT_BATCH_STATUS                     (1ULL<<LOC_API_ADAPTER_BATCH_STATUS)
+#define LOC_API_ADAPTER_BIT_FDCL_SERVICE_REQ                 (1ULL<<LOC_API_ADAPTER_FDCL_SERVICE_REQ)
+#define LOC_API_ADAPTER_BIT_PARSED_UNPROPAGATED_POSITION_REPORT (1ULL<<LOC_API_ADAPTER_REPORT_UNPROPAGATED_POSITION)
+#define LOC_API_ADAPTER_BIT_BS_OBS_DATA_SERVICE_REQ          (1ULL<<LOC_API_ADAPTER_BS_OBS_DATA_SERVICE_REQ)
+#define LOC_API_ADAPTER_BIT_GNSS_SV_EPHEMERIS_REPORT         (1ULL<<LOC_API_ADAPTER_GNSS_SV_EPHEMERIS_REPORT)
+#define LOC_API_ADAPTER_BIT_LOC_SYSTEM_INFO                  (1ULL<<LOC_API_ADAPTER_LOC_SYSTEM_INFO)
+#define LOC_API_ADAPTER_BIT_GNSS_NHZ_MEASUREMENT             (1ULL<<LOC_API_ADAPTER_GNSS_NHZ_MEASUREMENT_REPORT)
+#define LOC_API_ADAPTER_BIT_EVENT_REPORT_INFO                (1ULL<<LOC_API_ADAPTER_EVENT_REPORT_INFO)
+#define LOC_API_ADAPTER_BIT_LATENCY_INFORMATION              (1ULL<<LOC_API_ADAPTER_LATENCY_INFORMATION_REPORT)
+
+typedef uint64_t LOC_API_ADAPTER_EVENT_MASK_T;
+
+typedef enum loc_api_adapter_msg_to_check_supported {
+    LOC_API_ADAPTER_MESSAGE_LOCATION_BATCHING,               // Batching 1.0
+    LOC_API_ADAPTER_MESSAGE_BATCHED_GENFENCE_BREACH,         // Geofence Batched Breach
+    LOC_API_ADAPTER_MESSAGE_DISTANCE_BASE_TRACKING,          // DBT 2.0
+    LOC_API_ADAPTER_MESSAGE_ADAPTIVE_LOCATION_BATCHING,      // Batching 1.5
+    LOC_API_ADAPTER_MESSAGE_DISTANCE_BASE_LOCATION_BATCHING, // Batching 2.0
+    LOC_API_ADAPTER_MESSAGE_UPDATE_TBF_ON_THE_FLY,           // Updating Tracking TBF On The Fly
+    LOC_API_ADAPTER_MESSAGE_OUTDOOR_TRIP_BATCHING,           // Outdoor Trip Batching
+
+    LOC_API_ADAPTER_MESSAGE_MAX
+} LocCheckingMessagesID;
+
+typedef int IzatDevId_t;
+
+typedef uint32_t LOC_GPS_LOCK_MASK;
+#define isGpsLockNone(lock) ((lock) == 0)
+#define isGpsLockMO(lock) ((lock) & ((LOC_GPS_LOCK_MASK)1))
+#define isGpsLockMT(lock) ((lock) & ((LOC_GPS_LOCK_MASK)2))
+#define isGpsLockAll(lock) (((lock) & ((LOC_GPS_LOCK_MASK)3)) == 3)
+
+/* ***********************************************
+**  Satellite Measurement and Satellite Polynomial
+**  structure definitions
+** ***********************************************
+*/
+#define GNSS_SV_POLY_VELOCITY_COEF_MAX_SIZE         12
+#define GNSS_SV_POLY_XYZ_0_TH_ORDER_COEFF_MAX_SIZE  3
+#define GNSS_SV_POLY_XYZ_N_TH_ORDER_COEFF_MAX_SIZE  9
+#define GNSS_SV_POLY_SV_CLKBIAS_COEFF_MAX_SIZE      4
+/** Max number of GNSS SV measurement */
+#define GNSS_LOC_SV_MEAS_LIST_MAX_SIZE              128
+
+enum ulp_gnss_sv_measurement_valid_flags{
+
+    ULP_GNSS_SV_MEAS_GPS_TIME = 0,
+    ULP_GNSS_SV_MEAS_PSUEDO_RANGE,
+    ULP_GNSS_SV_MEAS_MS_IN_WEEK,
+    ULP_GNSS_SV_MEAS_SUB_MSEC,
+    ULP_GNSS_SV_MEAS_CARRIER_PHASE,
+    ULP_GNSS_SV_MEAS_DOPPLER_SHIFT,
+    ULP_GNSS_SV_MEAS_CNO,
+    ULP_GNSS_SV_MEAS_LOSS_OF_LOCK,
+
+    ULP_GNSS_SV_MEAS_MAX_VALID_FLAGS
+};
+
+#define ULP_GNSS_SV_MEAS_BIT_GPS_TIME        (1<<ULP_GNSS_SV_MEAS_GPS_TIME)
+#define ULP_GNSS_SV_MEAS_BIT_PSUEDO_RANGE    (1<<ULP_GNSS_SV_MEAS_PSUEDO_RANGE)
+#define ULP_GNSS_SV_MEAS_BIT_MS_IN_WEEK      (1<<ULP_GNSS_SV_MEAS_MS_IN_WEEK)
+#define ULP_GNSS_SV_MEAS_BIT_SUB_MSEC        (1<<ULP_GNSS_SV_MEAS_SUB_MSEC)
+#define ULP_GNSS_SV_MEAS_BIT_CARRIER_PHASE   (1<<ULP_GNSS_SV_MEAS_CARRIER_PHASE)
+#define ULP_GNSS_SV_MEAS_BIT_DOPPLER_SHIFT   (1<<ULP_GNSS_SV_MEAS_DOPPLER_SHIFT)
+#define ULP_GNSS_SV_MEAS_BIT_CNO             (1<<ULP_GNSS_SV_MEAS_CNO)
+#define ULP_GNSS_SV_MEAS_BIT_LOSS_OF_LOCK    (1<<ULP_GNSS_SV_MEAS_LOSS_OF_LOCK)
+
+enum ulp_gnss_sv_poly_valid_flags{
+
+    ULP_GNSS_SV_POLY_GLO_FREQ = 0,
+    ULP_GNSS_SV_POLY_T0,
+    ULP_GNSS_SV_POLY_IODE,
+    ULP_GNSS_SV_POLY_FLAG,
+    ULP_GNSS_SV_POLY_POLYCOEFF_XYZ0,
+    ULP_GNSS_SV_POLY_POLYCOEFF_XYZN,
+    ULP_GNSS_SV_POLY_POLYCOEFF_OTHER,
+    ULP_GNSS_SV_POLY_SV_POSUNC,
+    ULP_GNSS_SV_POLY_IONODELAY,
+    ULP_GNSS_SV_POLY_IONODOT,
+    ULP_GNSS_SV_POLY_SBAS_IONODELAY,
+    ULP_GNSS_SV_POLY_SBAS_IONODOT,
+    ULP_GNSS_SV_POLY_TROPODELAY,
+    ULP_GNSS_SV_POLY_ELEVATION,
+    ULP_GNSS_SV_POLY_ELEVATIONDOT,
+    ULP_GNSS_SV_POLY_ELEVATIONUNC,
+    ULP_GNSS_SV_POLY_VELO_COEFF,
+    ULP_GNSS_SV_POLY_ENHANCED_IOD,
+    ULP_GNSS_SV_POLY_GPS_ISC_L1CA,
+    ULP_GNSS_SV_POLY_GPS_ISC_L2C,
+    ULP_GNSS_SV_POLY_GPS_ISC_L5I5,
+    ULP_GNSS_SV_POLY_GPS_ISC_L5Q5,
+    ULP_GNSS_SV_POLY_GPS_TGD,
+    ULP_GNSS_SV_POLY_GLO_TGD_G1G2,
+    ULP_GNSS_SV_POLY_BDS_TGD_B1,
+    ULP_GNSS_SV_POLY_BDS_TGD_B2,
+    ULP_GNSS_SV_POLY_BDS_TGD_B2A,
+    ULP_GNSS_SV_POLY_BDS_ISC_B2A,
+    ULP_GNSS_SV_POLY_GAL_BGD_E1E5A,
+    ULP_GNSS_SV_POLY_GAL_BGD_E1E5B,
+    ULP_GNSS_SV_POLY_NAVIC_TGD_L5
+};
+
+#define ULP_GNSS_SV_POLY_BIT_GLO_FREQ               (1<<ULP_GNSS_SV_POLY_GLO_FREQ)
+#define ULP_GNSS_SV_POLY_BIT_T0                     (1<<ULP_GNSS_SV_POLY_T0)
+#define ULP_GNSS_SV_POLY_BIT_IODE                   (1<<ULP_GNSS_SV_POLY_IODE)
+#define ULP_GNSS_SV_POLY_BIT_FLAG                   (1<<ULP_GNSS_SV_POLY_FLAG)
+#define ULP_GNSS_SV_POLY_BIT_POLYCOEFF_XYZ0         (1<<ULP_GNSS_SV_POLY_POLYCOEFF_XYZ0)
+#define ULP_GNSS_SV_POLY_BIT_POLYCOEFF_XYZN         (1<<ULP_GNSS_SV_POLY_POLYCOEFF_XYZN)
+#define ULP_GNSS_SV_POLY_BIT_POLYCOEFF_OTHER        (1<<ULP_GNSS_SV_POLY_POLYCOEFF_OTHER)
+#define ULP_GNSS_SV_POLY_BIT_SV_POSUNC              (1<<ULP_GNSS_SV_POLY_SV_POSUNC)
+#define ULP_GNSS_SV_POLY_BIT_IONODELAY              (1<<ULP_GNSS_SV_POLY_IONODELAY)
+#define ULP_GNSS_SV_POLY_BIT_IONODOT                (1<<ULP_GNSS_SV_POLY_IONODOT)
+#define ULP_GNSS_SV_POLY_BIT_SBAS_IONODELAY         (1<<ULP_GNSS_SV_POLY_SBAS_IONODELAY)
+#define ULP_GNSS_SV_POLY_BIT_SBAS_IONODOT           (1<<ULP_GNSS_SV_POLY_SBAS_IONODOT)
+#define ULP_GNSS_SV_POLY_BIT_TROPODELAY             (1<<ULP_GNSS_SV_POLY_TROPODELAY)
+#define ULP_GNSS_SV_POLY_BIT_ELEVATION              (1<<ULP_GNSS_SV_POLY_ELEVATION)
+#define ULP_GNSS_SV_POLY_BIT_ELEVATIONDOT           (1<<ULP_GNSS_SV_POLY_ELEVATIONDOT)
+#define ULP_GNSS_SV_POLY_BIT_ELEVATIONUNC           (1<<ULP_GNSS_SV_POLY_ELEVATIONUNC)
+#define ULP_GNSS_SV_POLY_BIT_VELO_COEFF             (1<<ULP_GNSS_SV_POLY_VELO_COEFF)
+#define ULP_GNSS_SV_POLY_BIT_ENHANCED_IOD           (1<<ULP_GNSS_SV_POLY_ENHANCED_IOD)
+#define ULP_GNSS_SV_POLY_BIT_GPS_ISC_L1CA           (1<<ULP_GNSS_SV_POLY_GPS_ISC_L1CA)
+#define ULP_GNSS_SV_POLY_BIT_GPS_ISC_L2C            (1<<ULP_GNSS_SV_POLY_GPS_ISC_L2C)
+#define ULP_GNSS_SV_POLY_BIT_GPS_ISC_L5I5           (1<<ULP_GNSS_SV_POLY_GPS_ISC_L5I5)
+#define ULP_GNSS_SV_POLY_BIT_GPS_ISC_L5Q5           (1<<ULP_GNSS_SV_POLY_GPS_ISC_L5Q5)
+#define ULP_GNSS_SV_POLY_BIT_GPS_TGD                (1<<ULP_GNSS_SV_POLY_GPS_TGD)
+#define ULP_GNSS_SV_POLY_BIT_GLO_TGD_G1G2           (1<<ULP_GNSS_SV_POLY_GLO_TGD_G1G2)
+#define ULP_GNSS_SV_POLY_BIT_BDS_TGD_B1             (1<<ULP_GNSS_SV_POLY_BDS_TGD_B1)
+#define ULP_GNSS_SV_POLY_BIT_BDS_TGD_B2             (1<<ULP_GNSS_SV_POLY_BDS_TGD_B2)
+#define ULP_GNSS_SV_POLY_BIT_BDS_TGD_B2A            (1<<ULP_GNSS_SV_POLY_BDS_TGD_B2A)
+#define ULP_GNSS_SV_POLY_BIT_BDS_ISC_B2A            (1<<ULP_GNSS_SV_POLY_BDS_ISC_B2A)
+#define ULP_GNSS_SV_POLY_BIT_GAL_BGD_E1E5A          (1<<ULP_GNSS_SV_POLY_GAL_BGD_E1E5A)
+#define ULP_GNSS_SV_POLY_BIT_GAL_BGD_E1E5B          (1<<ULP_GNSS_SV_POLY_GAL_BGD_E1E5B)
+#define ULP_GNSS_SV_POLY_BIT_NAVIC_TGD_L5           (1<<ULP_GNSS_SV_POLY_NAVIC_TGD_L5)
+
+typedef enum
+{
+    GNSS_LOC_FREQ_SOURCE_INVALID = 0,
+    /**< Source of the frequency is invalid */
+    GNSS_LOC_FREQ_SOURCE_EXTERNAL = 1,
+    /**< Source of the frequency is from external injection */
+    GNSS_LOC_FREQ_SOURCE_PE_CLK_REPORT = 2,
+    /**< Source of the frequency is from Navigation engine */
+    GNSS_LOC_FREQ_SOURCE_UNKNOWN = 3
+    /**< Source of the frequency is unknown */
+} Gnss_LocSourceofFreqEnumType;
+
+typedef struct
+{
+    uint32_t                          size;
+    float                           clockDrift;
+    /**< Receiver clock Drift \n
+         - Units: meter per sec \n
+    */
+    float                           clockDriftUnc;
+    /**< Receiver clock Drift uncertainty \n
+         - Units: meter per sec \n
+    */
+    Gnss_LocSourceofFreqEnumType    sourceOfFreq;
+}Gnss_LocRcvrClockFrequencyInfoStructType;
+
+typedef struct
+{
+    uint32_t      size;
+    uint8_t     leapSec;
+    /**< GPS time leap second delta to UTC time  \n
+         - Units: sec \n
+       */
+    uint8_t     leapSecUnc;
+    /**< Uncertainty for GPS leap second \n
+         - Units: sec \n
+       */
+}Gnss_LeapSecondInfoStructType;
+
+typedef enum
+{
+   GNSS_LOC_SYS_TIME_BIAS_VALID                = 0x01,
+   /**< System time bias valid */
+   GNSS_LOC_SYS_TIME_BIAS_UNC_VALID            = 0x02,
+   /**< System time bias uncertainty valid */
+}Gnss_LocInterSystemBiasValidMaskType;
+
+typedef struct
+{
+    uint32_t          size;
+    uint32_t        validMask;
+    /* Validity mask as per Gnss_LocInterSystemBiasValidMaskType */
+
+    float           timeBias;
+    /**< System-1 to System-2 Time Bias  \n
+        - Units: msec \n
+    */
+    float           timeBiasUnc;
+    /**< System-1 to System-2 Time Bias uncertainty  \n
+        - Units: msec \n
+    */
+} Gnss_InterSystemBiasStructType;
+
+
+typedef struct {
+
+  uint32_t    size;
+
+  uint8_t   systemRtc_valid;
+  /**<   Validity indicator for System RTC */
+
+  uint64_t  systemRtcMs;
+  /**<   Platform system RTC value \n
+        - Units: msec \n
+        */
+
+}Gnss_LocGnssTimeExtStructType;
+
+typedef enum
+{
+    GNSS_LOC_MEAS_STATUS_NULL                    = 0x00000000,
+    /**< No information state */
+    GNSS_LOC_MEAS_STATUS_SM_VALID                = 0x00000001,
+    /**< Code phase is known */
+    GNSS_LOC_MEAS_STATUS_SB_VALID                = 0x00000002,
+    /**< Sub-bit time is known */
+    GNSS_LOC_MEAS_STATUS_MS_VALID                = 0x00000004,
+    /**< Satellite time is known */
+    GNSS_LOC_MEAS_STATUS_BE_CONFIRM              = 0x00000008,
+    /**< Bit edge is confirmed from signal   */
+    GNSS_LOC_MEAS_STATUS_VELOCITY_VALID          = 0x00000010,
+    /**< Satellite Doppler measured */
+    GNSS_LOC_MEAS_STATUS_VELOCITY_FINE           = 0x00000020,
+    /**< TRUE: Fine Doppler measured, FALSE: Coarse Doppler measured */
+    GNSS_LOC_MEAS_STATUS_LP_VALID                = 0x00000040,
+    /**<  TRUE/FALSE -- Lock Point is valid/invalid */
+    GNSS_LOC_MEAS_STATUS_LP_POS_VALID            = 0x00000080,
+    /**<  TRUE/FALSE -- Lock Point is positive/negative */
+    GNSS_LOC_MEAS_STATUS_FROM_RNG_DIFF           = 0x00000200,
+    /**< Range update from Satellite differences */
+    GNSS_LOC_MEAS_STATUS_FROM_VE_DIFF            = 0x00000400,
+    /**< Doppler update from Satellite differences */
+    GNSS_LOC_MEAS_STATUS_DONT_USE_X              = 0x00000800,
+    /**< Don't use measurement if bit is set */
+    GNSS_LOC_MEAS_STATUS_DONT_USE_M              = 0x00001000,
+    /**< Don't use measurement if bit is set */
+    GNSS_LOC_MEAS_STATUS_DONT_USE_D              = 0x00002000,
+    /**< Don't use measurement if bit is set */
+    GNSS_LOC_MEAS_STATUS_DONT_USE_S              = 0x00004000,
+    /**< Don't use measurement if bit is set */
+    GNSS_LOC_MEAS_STATUS_DONT_USE_P              = 0x00008000,
+    /**< Don't use measurement if bit is set */
+    GNSS_LOC_MEAS_STATUS_GNSS_FRESH_MEAS         = 0x08000000
+    /**< TRUE -- Fresh GNSS measurement observed in last second    */
+}Gnss_LocSvMeasStatusMaskType;
+
+typedef struct
+{
+    uint32_t              size;
+    uint32_t            svMs;
+    /**<  Satellite time milisecond.\n
+          For GPS, BDS, GAL range of 0 thru (604800000-1) \n
+          For GLONASS range of 0 thru (86400000-1) \n
+          Valid when PD_LOC_MEAS_STATUS_MS_VALID bit is set in measurement status \n
+          Note: All SV times in the current measurement block are alredy propagated to common reference time epoch. \n
+            - Units: msec \n
+       */
+    float               svSubMs;
+    /**<Satellite time sub-millisecond. \n
+        Total SV Time = svMs + svSubMs \n
+        - Units: msec \n
+       */
+    float               svTimeUncMs;
+    /**<  Satellite Time uncertainty \n
+          - Units: msec \n
+       */
+    float               dopplerShift;
+    /**< Satellite Doppler \n
+            - Units: meter per sec \n
+       */
+    float               dopplerShiftUnc;
+    /**< Satellite Doppler uncertainty\n
+            - Units: meter per sec \n
+       */
+}Gnss_LocSVTimeSpeedStructType;
+
+typedef enum
+{
+  GNSS_SV_STATE_IDLE = 0,
+  GNSS_SV_STATE_SEARCH = 1,
+  GNSS_SV_STATE_SEARCH_VERIFY = 2,
+  GNSS_SV_STATE_BIT_EDGE = 3,
+  GNSS_SV_STATE_VERIFY_TRACK = 4,
+  GNSS_SV_STATE_TRACK = 5,
+  GNSS_SV_STATE_RESTART = 6,
+  GNSS_SV_STATE_DPO_TRACK = 7
+} Gnss_LocSVStateEnumType;
+
+typedef enum
+{
+  GNSS_LOC_SVINFO_MASK_HAS_EPHEMERIS   = 0x01,
+  /**< Ephemeris is available for this SV */
+  GNSS_LOC_SVINFO_MASK_HAS_ALMANAC     = 0x02
+  /**< Almanac is available for this SV */
+}Gnss_LocSvInfoMaskT;
+
+typedef enum
+{
+  GNSS_LOC_SV_SRCH_STATUS_IDLE      = 1,
+    /**< SV is not being actively processed */
+  GNSS_LOC_SV_SRCH_STATUS_SEARCH    = 2,
+    /**< The system is searching for this SV */
+  GNSS_LOC_SV_SRCH_STATUS_TRACK     = 3
+    /**< SV is being tracked */
+}Gnss_LocSvSearchStatusEnumT;
+
+typedef uint32_t LocSvDgnssMeasStatusMask;
+#define LOC_MASK_DGNSS_EPOCH_TIME_VALID      0x1  /**<  DGNSS Epoch time is valid  */
+#define LOC_MASK_DGNSS_MEAS_STATUS_PR_VALID  0x2  /**<  Pseudo Range correction is valid  */
+#define LOC_MASK_DGNSS_MEAS_STATUS_PRR_VALID 0x4  /**<  Pseudo Range rate correction is valid  */
+
+typedef struct {
+  LocSvDgnssMeasStatusMask dgnssMeasStatus;
+  /**<   Bitmask indicating the DGNSS SV measurement status. */
+
+  uint32_t diffDataEpochTimeMsec;
+  /**<   Age of differential data in Milli Seconds with respect to the Measurement time. */
+
+  float prCorrMeters;
+  /**<   Pseudo Range correction in meters. */
+
+  float prrCorrMetersPerSec;
+  /**<  Pseudo Range rate correction in meters per second. */
+} Gnss_LocDgnssSVMeasurement;
+
+typedef struct
+{
+    uint32_t                          size;
+    Gnss_LocSvSystemEnumType        gnssSystem;
+    // 0 signal type mask indicates invalid value
+    GnssSignalTypeMask              gnssSignalTypeMask;
+    uint16_t                        gnssSvId;
+    /** Unique SV Identifier.
+     *  For SV Range of supported constellation, please refer to the
+     *  comment section of gnssSvId in GpsMeasUsageInfo.
+    */
+    uint8_t                         gloFrequency;
+    /**< GLONASS frequency number + 7 \n
+         Valid only for GLONASS System \n
+         Shall be ignored for all other systems \n
+          - Range: 1 to 14 \n
+    */
+    Gnss_LocSvSearchStatusEnumT     svStatus;
+    /**< Satellite search state \n
+        @ENUM()
+    */
+    bool                         healthStatus_valid;
+    /**< SV Health Status validity flag\n
+        - 0: Not valid \n
+        - 1: Valid \n
+    */
+    uint8_t                         healthStatus;
+    /**< Health status.
+         \begin{itemize1}
+         \item    Range: 0 to 1; 0 = unhealthy, \n 1 = healthy, 2 = unknown
+         \vspace{-0.18in} \end{itemize1}
+    */
+    Gnss_LocSvInfoMaskT             svInfoMask;
+    /**< Indicates whether almanac and ephemeris information is available. \n
+        @MASK()
+    */
+    uint64_t                        measurementStatus;
+    /**< Bitmask indicating SV measurement status.
+        Valid bitmasks: \n
+        If any MSB bit in 0xFFC0000000000000 DONT_USE is set, the measurement
+        must not be used by the client.
+        @MASK()
+    */
+    uint16_t                        CNo;
+    /**< Carrier to Noise ratio  \n
+        - Units: 0.1 dBHz \n
+    */
+    uint16_t                          gloRfLoss;
+    /**< GLONASS Rf loss reference to Antenna. \n
+         - Units: dB, Scale: 0.1 \n
+    */
+    bool                         lossOfLock;
+    /**< Loss of signal lock indicator  \n
+         - 0: Signal in continuous track \n
+         - 1: Signal not in track \n
+    */
+    int16_t                         measLatency;
+    /**< Age of the measurement. Positive value means measurement precedes ref time. \n
+         - Units: msec \n
+    */
+    Gnss_LocSVTimeSpeedStructType   svTimeSpeed;
+    /**< Unfiltered SV Time and Speed information
+    */
+    float                           dopplerAccel;
+    /**< Satellite Doppler Accelertion\n
+         - Units: Hz/s \n
+    */
+    bool                         multipathEstValid;
+    /**< Multipath estimate validity flag\n
+        - 0: Multipath estimate not valid \n
+        - 1: Multipath estimate valid \n
+    */
+    float                           multipathEstimate;
+    /**< Estimate of multipath in measurement\n
+         - Units: Meters \n
+    */
+    bool                         fineSpeedValid;
+    /**< Fine speed validity flag\n
+         - 0: Fine speed not valid \n
+         - 1: Fine speed valid \n
+    */
+    float                           fineSpeed;
+    /**< Carrier phase derived speed \n
+         - Units: m/s \n
+    */
+    bool                         fineSpeedUncValid;
+    /**< Fine speed uncertainty validity flag\n
+         - 0: Fine speed uncertainty not valid \n
+         - 1: Fine speed uncertainty valid \n
+    */
+    float                           fineSpeedUnc;
+    /**< Carrier phase derived speed \n
+        - Units: m/s \n
+    */
+    bool                         carrierPhaseValid;
+    /**< Carrier Phase measurement validity flag\n
+         - 0: Carrier Phase not valid \n
+         - 1: Carrier Phase valid \n
+    */
+    double                          carrierPhase;
+    /**< Carrier phase measurement [L1 cycles] \n
+    */
+    bool                         cycleSlipCountValid;
+     /**< Cycle slup count validity flag\n
+         - 0: Not valid \n
+         - 1: Valid \n
+    */
+    uint8_t                         cycleSlipCount;
+    /**< Increments when a CSlip is detected */
+
+    bool                         svDirectionValid;
+    /**< Validity flag for SV direction */
+
+    float                           svAzimuth;
+    /**< Satellite Azimuth
+        - Units: radians \n
+    */
+    float                           svElevation;
+    /**< Satellite Elevation
+        - Units: radians \n
+    */
+    uint64_t                        validMeasStatusMask;
+    /**< Bitmask indicating SV measurement status Validity.
+        Valid bitmasks: \n
+        If any MSB bit in 0xFFC0000000000000 DONT_USE is set, the measurement
+        must not be used by the client.
+        @MASK()
+    */
+    bool                         carrierPhaseUncValid;
+    /**< Validity flag for SV direction */
+
+    float                           carrierPhaseUnc;
+
+    /** < DGNSS Measurements Report for SVs */
+    Gnss_LocDgnssSVMeasurement   dgnssSvMeas;
+} Gnss_SVMeasurementStructType;
+
+
+typedef uint64_t GpsSvMeasHeaderFlags;
+#define GNSS_SV_MEAS_HEADER_HAS_LEAP_SECOND                   0x000000001
+#define GNSS_SV_MEAS_HEADER_HAS_CLOCK_FREQ                    0x000000002
+#define GNSS_SV_MEAS_HEADER_HAS_AP_TIMESTAMP                  0x000000004
+#define GNSS_SV_MEAS_HEADER_HAS_GPS_GLO_INTER_SYSTEM_BIAS     0x000000008
+#define GNSS_SV_MEAS_HEADER_HAS_GPS_BDS_INTER_SYSTEM_BIAS     0x000000010
+#define GNSS_SV_MEAS_HEADER_HAS_GPS_GAL_INTER_SYSTEM_BIAS     0x000000020
+#define GNSS_SV_MEAS_HEADER_HAS_BDS_GLO_INTER_SYSTEM_BIAS     0x000000040
+#define GNSS_SV_MEAS_HEADER_HAS_GAL_GLO_INTER_SYSTEM_BIAS     0x000000080
+#define GNSS_SV_MEAS_HEADER_HAS_GAL_BDS_INTER_SYSTEM_BIAS     0x000000100
+#define GNSS_SV_MEAS_HEADER_HAS_GPS_SYSTEM_TIME               0x000000200
+#define GNSS_SV_MEAS_HEADER_HAS_GAL_SYSTEM_TIME               0x000000400
+#define GNSS_SV_MEAS_HEADER_HAS_BDS_SYSTEM_TIME               0x000000800
+#define GNSS_SV_MEAS_HEADER_HAS_QZSS_SYSTEM_TIME              0x000001000
+#define GNSS_SV_MEAS_HEADER_HAS_GLO_SYSTEM_TIME               0x000002000
+#define GNSS_SV_MEAS_HEADER_HAS_GPS_SYSTEM_TIME_EXT           0x000004000
+#define GNSS_SV_MEAS_HEADER_HAS_GAL_SYSTEM_TIME_EXT           0x000008000
+#define GNSS_SV_MEAS_HEADER_HAS_BDS_SYSTEM_TIME_EXT           0x000010000
+#define GNSS_SV_MEAS_HEADER_HAS_QZSS_SYSTEM_TIME_EXT          0x000020000
+#define GNSS_SV_MEAS_HEADER_HAS_GLO_SYSTEM_TIME_EXT           0x000040000
+#define GNSS_SV_MEAS_HEADER_HAS_GPSL1L5_TIME_BIAS             0x000080000
+#define GNSS_SV_MEAS_HEADER_HAS_GALE1E5A_TIME_BIAS            0x000100000
+#define GNSS_SV_MEAS_HEADER_HAS_BDSB1IB2A_TIME_BIAS           0x000200000
+#define GNSS_SV_MEAS_HEADER_HAS_GPS_NAVIC_INTER_SYSTEM_BIAS   0x000400000
+#define GNSS_SV_MEAS_HEADER_HAS_GAL_NAVIC_INTER_SYSTEM_BIAS   0x000800000
+#define GNSS_SV_MEAS_HEADER_HAS_GLO_NAVIC_INTER_SYSTEM_BIAS   0x001000000
+#define GNSS_SV_MEAS_HEADER_HAS_BDS_NAVIC_INTER_SYSTEM_BIAS   0x002000000
+#define GNSS_SV_MEAS_HEADER_HAS_NAVIC_SYSTEM_TIME             0x004000000
+#define GNSS_SV_MEAS_HEADER_HAS_NAVIC_SYSTEM_TIME_EXT         0x008000000
+#define GNSS_SV_MEAS_HEADER_HAS_DGNSS_CORRECTION_SOURCE_TYPE  0x010000000
+#define GNSS_SV_MEAS_HEADER_HAS_DGNSS_CORRECTION_SOURCE_ID    0x020000000
+#define GNSS_SV_MEAS_HEADER_HAS_DGNSS_REF_STATION_ID          0x040000000
+#define GNSS_SV_MEAS_HEADER_HAS_REF_COUNT_TICKS               0x080000000
+#define GNSS_SV_MEAS_HEADER_HAS_GPSL1L2C_TIME_BIAS            0x100000000
+#define GNSS_SV_MEAS_HEADER_HAS_GLOG1G2_TIME_BIAS             0x200000000
+#define GNSS_SV_MEAS_HEADER_HAS_BDSB1IB1C_TIME_BIAS           0x400000000
+#define GNSS_SV_MEAS_HEADER_HAS_GALE1E5B_TIME_BIAS            0x800000000
+
+typedef struct
+{
+    uint32_t                                      size;
+    // see defines in GNSS_SV_MEAS_HEADER_HAS_XXX_XXX
+    uint64_t                                    flags;
+
+    Gnss_LeapSecondInfoStructType               leapSec;
+
+    Gnss_LocRcvrClockFrequencyInfoStructType    clockFreq;   /* Freq */
+
+    Gnss_ApTimeStampStructType                  apBootTimeStamp;
+
+    Gnss_InterSystemBiasStructType              gpsGloInterSystemBias;
+    Gnss_InterSystemBiasStructType              gpsBdsInterSystemBias;
+    Gnss_InterSystemBiasStructType              gpsGalInterSystemBias;
+    Gnss_InterSystemBiasStructType              bdsGloInterSystemBias;
+    Gnss_InterSystemBiasStructType              galGloInterSystemBias;
+    Gnss_InterSystemBiasStructType              galBdsInterSystemBias;
+    Gnss_InterSystemBiasStructType              gpsNavicInterSystemBias;
+    Gnss_InterSystemBiasStructType              galNavicInterSystemBias;
+    Gnss_InterSystemBiasStructType              gloNavicInterSystemBias;
+    Gnss_InterSystemBiasStructType              bdsNavicInterSystemBias;
+    Gnss_InterSystemBiasStructType              gpsL1L5TimeBias;
+    Gnss_InterSystemBiasStructType              galE1E5aTimeBias;
+    Gnss_InterSystemBiasStructType              bdsB1iB2aTimeBias;
+    Gnss_InterSystemBiasStructType              gpsL1L2cTimeBias;
+    Gnss_InterSystemBiasStructType              gloG1G2TimeBias;
+    Gnss_InterSystemBiasStructType              bdsB1iB1cTimeBias;
+    Gnss_InterSystemBiasStructType              galE1E5bTimeBias;
+
+    GnssSystemTimeStructType                    gpsSystemTime;
+    GnssSystemTimeStructType                    galSystemTime;
+    GnssSystemTimeStructType                    bdsSystemTime;
+    GnssSystemTimeStructType                    qzssSystemTime;
+    GnssSystemTimeStructType                    navicSystemTime;
+    GnssGloTimeStructType                       gloSystemTime;
+
+    /** GPS system RTC time information. */
+    Gnss_LocGnssTimeExtStructType               gpsSystemTimeExt;
+    /** GAL system RTC time information. */
+    Gnss_LocGnssTimeExtStructType               galSystemTimeExt;
+    /** BDS system RTC time information. */
+    Gnss_LocGnssTimeExtStructType               bdsSystemTimeExt;
+    /** QZSS system RTC time information. */
+    Gnss_LocGnssTimeExtStructType               qzssSystemTimeExt;
+    /** GLONASS system RTC time information. */
+    Gnss_LocGnssTimeExtStructType               gloSystemTimeExt;
+    /** NAVIC system RTC time information. */
+    Gnss_LocGnssTimeExtStructType               navicSystemTimeExt;
+
+    /** Receiver tick at frame count */
+    uint64_t                                    refCountTicks;
+
+    /** DGNSS corrections source type RTCM, 3GPP etc, if DGNSS was
+     *  used for these measurements. */
+    LocDgnssCorrectionSourceType                dgnssCorrectionSourceType;
+
+    /** DGNSS SourceID: 32bit number identifying the DGNSS source
+     *  ID, if DGNSS was used for these measurements. */
+    uint32_t                                    dgnssCorrectionSourceID;
+
+    /** DGNSS Ref station ID: 32bit number identifying the DGNSS
+     *  ref station ID, if DGNSS was used for these measurements. */
+    uint16_t                                    dgnssRefStationId;
+} GnssSvMeasurementHeader;
+
+typedef struct {
+    uint32_t                        size;
+    bool                          isNhz;
+    GnssSvMeasurementHeader       svMeasSetHeader;
+    uint32_t                      svMeasCount;
+    Gnss_SVMeasurementStructType  svMeas[GNSS_LOC_SV_MEAS_LIST_MAX_SIZE];
+
+} GnssSvMeasurementSet;
+
+typedef struct {
+    uint32_t size;                  // set to sizeof(GnssMeasurements)
+    GnssSvMeasurementSet            gnssSvMeasurementSet;
+    GnssMeasurementsNotification    gnssMeasNotification;
+} GnssMeasurements;
+
+typedef enum
+{
+   GNSS_SV_POLY_COEFF_VALID             = 0x01,
+   /**< SV position in orbit coefficients are valid */
+   GNSS_SV_POLY_IONO_VALID              = 0x02,
+   /**< Iono estimates are valid */
+
+   GNSS_SV_POLY_TROPO_VALID             = 0x04,
+   /**< Tropo estimates are valid */
+
+   GNSS_SV_POLY_ELEV_VALID              = 0x08,
+   /**< Elevation, rate, uncertainty are valid */
+
+   GNSS_SV_POLY_SRC_ALM_CORR            = 0x10,
+   /**< Polynomials based on XTRA */
+
+   GNSS_SV_POLY_SBAS_IONO_VALID         = 0x20,
+   /**< SBAS IONO and rate are valid */
+
+   GNSS_SV_POLY_GLO_STR4                = 0x40
+   /**< GLONASS String 4 has been received */
+} Gnss_SvPolyStatusMaskType;
+
+typedef struct {
+    uint32_t      size;
+    uint16_t     gnssSvId;
+    /** Unique SV Identifier.
+     *  For SV Range of supported constellation, please refer to the
+     *  comment section of gnssSvId in GpsMeasUsageInfo.
+    */
+    int8_t      freqNum;
+    /** Freq index, only valid if u_SysInd is GLO */
+
+    GnssSvPolyStatusMaskValidity svPolyStatusMaskValidity;
+    GnssSvPolyStatusMask         svPolyStatusMask;
+
+    uint32_t    is_valid;
+
+    uint16_t     iode;
+    /* Ephemeris reference time
+       GPS:Issue of Data Ephemeris used [unitless].
+       GLO: Tb 7-bit, refer to ICD02
+    */
+    double      T0;
+    /* Reference time for polynominal calculations
+       GPS: Secs in week.
+       GLO: Full secs since Jan/01/96
+    */
+    double      polyCoeffXYZ0[GNSS_SV_POLY_XYZ_0_TH_ORDER_COEFF_MAX_SIZE];
+    /* C0X, C0Y, C0Z */
+    double      polyCoefXYZN[GNSS_SV_POLY_XYZ_N_TH_ORDER_COEFF_MAX_SIZE];
+    /* C1X, C2X ... C2Z, C3Z */
+    float       polyCoefOther[GNSS_SV_POLY_SV_CLKBIAS_COEFF_MAX_SIZE];
+    /* C0T, C1T, C2T, C3T */
+    float       svPosUnc;       /* SV position uncertainty [m]. */
+    float       ionoDelay;    /* Ionospheric delay at d_T0 [m]. */
+    float       ionoDot;      /* Iono delay rate [m/s].  */
+    float       sbasIonoDelay;/* SBAS Ionospheric delay at d_T0 [m]. */
+    float       sbasIonoDot;  /* SBAS Iono delay rate [m/s].  */
+    float       tropoDelay;   /* Tropospheric delay [m]. */
+    float       elevation;    /* Elevation [rad] at d_T0 */
+    float       elevationDot;      /* Elevation rate [rad/s] */
+    float       elevationUnc;      /* SV elevation [rad] uncertainty */
+    double      velCoef[GNSS_SV_POLY_VELOCITY_COEF_MAX_SIZE];
+    /* Coefficients of velocity poly */
+    uint32_t    enhancedIOD;    /*  Enhanced Reference Time */
+    float gpsIscL1ca;
+    float gpsIscL2c;
+    float gpsIscL5I5;
+    float gpsIscL5Q5;
+    float gpsTgd;
+    float gloTgdG1G2;
+    float bdsTgdB1;
+    float bdsTgdB2;
+    float bdsTgdB2a;
+    float bdsIscB2a;
+    float galBgdE1E5a;
+    float galBgdE1E5b;
+    float navicTgdL5;
+} GnssSvPolynomial;
+
+typedef enum {
+    GNSS_EPH_ACTION_UPDATE_SRC_UNKNOWN_V02 = 0, /**<Update ephemeris. Source of ephemeris is unknown  */
+    GNSS_EPH_ACTION_UPDATE_SRC_OTA_V02         = 1, /**<Update ephemeris. Source of ephemeris is OTA  */
+    GNSS_EPH_ACTION_UPDATE_SRC_NETWORK_V02     = 2, /**<Update ephemeris. Source of ephemeris is Network  */
+    GNSS_EPH_ACTION_UPDATE_MAX_V02         = 999, /**<Max value for update ephemeris action. DO NOT USE  */
+    GNSS_EPH_ACTION_DELETE_SRC_UNKNOWN_V02 = 1000, /**<Delete previous ephemeris from unknown source  */
+    GNSS_EPH_ACTION_DELETE_SRC_NETWORK_V02 = 1001, /**<Delete previous ephemeris from network  */
+    GNSS_EPH_ACTION_DELETE_SRC_OTA_V02     = 1002, /**<Delete previous ephemeris from OTA  */
+    GNSS_EPH_ACTION_DELETE_MAX_V02     = 1999, /**<Max value for delete ephemeris action. DO NOT USE  */
+} GnssEphAction;
+
+typedef enum {
+    GAL_EPH_SIGNAL_SRC_UNKNOWN_V02 = 0, /**<  GALILEO signal is unknown  */
+    GAL_EPH_SIGNAL_SRC_E1B_V02     = 1, /**<  GALILEO signal is E1B  */
+    GAL_EPH_SIGNAL_SRC_E5A_V02     = 2, /**<  GALILEO signal is E5A  */
+    GAL_EPH_SIGNAL_SRC_E5B_V02     = 3, /**<  GALILEO signal is E5B  */
+} GalEphSignalSource;
+
+typedef struct {
+    uint16_t gnssSvId;
+    /** Unique SV Identifier.
+     *  For SV Range of supported constellation, please refer to the
+     *  comment section of gnssSvId in GpsMeasUsageInfo.
+     */
+
+    GnssEphAction updateAction;
+    /**<   Specifies the action and source of ephemeris. \n
+    - Type: int32 enum */
+
+    uint16_t IODE;
+    /**<   Issue of data ephemeris used (unit-less). \n
+        GPS: IODE 8 bits.\n
+        BDS: AODE 5 bits. \n
+        GAL: SIS IOD 10 bits. \n
+        - Type: uint16
+        - Units: Unit-less */
+
+    double aSqrt;
+    /**<   Square root of semi-major axis. \n
+      - Type: double
+      - Units: Square Root of Meters */
+
+    double deltaN;
+    /**<   Mean motion difference from computed value. \n
+      - Type: double
+      - Units: Radians/Second */
+
+    double m0;
+    /**<   Mean anomaly at reference time. \n
+      - Type: double
+      - Units: Radians */
+
+    double eccentricity;
+    /**<   Eccentricity . \n
+      - Type: double
+      - Units: Unit-less */
+
+    double omega0;
+    /**<   Longitude of ascending node of orbital plane at the weekly epoch. \n
+      - Type: double
+      - Units: Radians */
+
+    double i0;
+    /**<   Inclination angle at reference time. \n
+      - Type: double
+      - Units: Radians */
+
+    double omega;
+    /**<   Argument of Perigee. \n
+      - Type: double
+      - Units: Radians */
+
+    double omegaDot;
+    /**<   Rate of change of right ascension. \n
+      - Type: double
+      - Units: Radians/Second */
+
+    double iDot;
+    /**<   Rate of change of inclination angle. \n
+      - Type: double
+      - Units: Radians/Second */
+
+    double cUc;
+    /**<   Amplitude of the cosine harmonic correction term to the argument of latitude. \n
+      - Type: double
+      - Units: Radians */
+
+    double cUs;
+    /**<   Amplitude of the sine harmonic correction term to the argument of latitude. \n
+      - Type: double
+      - Units: Radians */
+
+    double cRc;
+    /**<   Amplitude of the cosine harmonic correction term to the orbit radius. \n
+      - Type: double
+      - Units: Meters */
+
+    double cRs;
+    /**<   Amplitude of the sine harmonic correction term to the orbit radius. \n
+      - Type: double
+      - Units: Meters */
+
+    double cIc;
+    /**<   Amplitude of the cosine harmonic correction term to the angle of inclination. \n
+      - Type: double
+      - Units: Radians */
+
+    double cIs;
+    /**<   Amplitude of the sine harmonic correction term to the angle of inclination. \n
+      - Type: double
+      - Units: Radians */
+
+    uint32_t toe;
+    /**<   Reference time of ephemeris. \n
+      - Type: uint32
+      - Units: Seconds */
+
+    uint32_t toc;
+    /**<   Clock data reference time of week.  \n
+      - Type: uint32
+      - Units: Seconds */
+
+    double af0;
+    /**<   Clock bias correction coefficient. \n
+      - Type: double
+      - Units: Seconds */
+
+    double af1;
+    /**<   Clock drift coefficient. \n
+      - Type: double
+      - Units: Seconds/Second */
+
+    double af2;
+    /**<   Clock drift rate correction coefficient. \n
+      - Type: double
+      - Units: Seconds/Seconds^2 */
+
+} GnssEphCommon;
+
+/* GPS Navigation Model Info */
+typedef struct {
+    GnssEphCommon commonEphemerisData;
+    /**<   Common ephemeris data.   */
+
+    uint8_t signalHealth;
+    /**<   Signal health. \n
+         Bit 0 : L5 Signal Health. \n
+         Bit 1 : L2 Signal Health. \n
+         Bit 2 : L1 Signal Health. \n
+         - Type: uint8
+         - Values: 3 bit mask of signal health, where set bit indicates unhealthy signal */
+
+    uint8_t URAI;
+    /**<   User Range Accuracy Index. \n
+         - Type: uint8
+         - Units: Unit-less */
+
+    uint8_t codeL2;
+    /**<   Indicates which codes are commanded ON for the L2 channel (2-bits). \n
+         - Type: uint8
+         Valid Values: \n
+         - 00 : Reserved
+         - 01 : P code ON
+         - 10 : C/A code ON */
+
+    uint8_t dataFlagL2P;
+    /**<   L2 P-code indication flag. \n
+         - Type: uint8
+         - Value 1 indicates that the Nav data stream was commanded OFF on the P-code of the L2 channel. */
+
+    double tgd;
+    /**<   Time of group delay. \n
+         - Type: double
+         - Units: Seconds */
+
+    uint8_t fitInterval;
+    /**<   Indicates the curve-fit interval used by the CS. \n
+         - Type: uint8
+         Valid Values:
+         - 0 : Four hours
+         - 1 : Greater than four hours */
+
+    uint16_t IODC;
+    /**<   Issue of Data, Clock. \n
+         - Type: uint16
+         - Units: Unit-less */
+} GpsEphemeris;
+
+/* GLONASS Navigation Model Info */
+typedef struct {
+
+    uint16_t gnssSvId;
+    /**<   GNSS SV ID.
+       - Type: uint16
+       - Range: 65 to 96 if known. When the slot number to SV ID mapping is unknown, set to 255 */
+
+    GnssEphAction updateAction;
+    /**<   Specifies the action and source of ephemeris. \n
+    - Type: int32 enum */
+
+    uint8_t bnHealth;
+    /**<   SV health flags. \n
+       - Type: uint8
+       Valid Values: \n
+    - 0 : Healthy
+    - 1 : Unhealthy */
+
+    uint8_t lnHealth;
+    /**<   Ln SV health flags. GLONASS-M. \n
+       - Type: uint8
+       Valid Values: \n
+    - 0 : Healthy
+    - 1 : Unhealthy */
+
+    uint8_t tb;
+    /**<   Index of a time interval within current day according to UTC(SU) + 03 hours 00 min. \n
+       - Type: uint8
+       - Units: Unit-less */
+
+    uint8_t ft;
+    /**<   SV accuracy index. \n
+       - Type: uint8
+       - Units: Unit-less */
+
+    uint8_t gloM;
+    /**<   GLONASS-M flag. \n
+       - Type: uint8
+       Valid Values: \n
+    - 0 : GLONASS
+    - 1 : GLONASS-M */
+
+    uint8_t enAge;
+    /**<   Characterizes "Age" of current information. \n
+       - Type: uint8
+       - Units: Days */
+
+    uint8_t gloFrequency;
+    /**<   GLONASS frequency number + 8. \n
+       - Type: uint8
+       - Range: 1 to 14
+    */
+
+    uint8_t p1;
+    /**<   Time interval between two adjacent values of tb parameter. \n
+       - Type: uint8
+       - Units: Minutes */
+
+    uint8_t p2;
+    /**<   Flag of oddness ("1") or evenness ("0") of the value of tb \n
+       for intervals 30 or 60 minutes. \n
+       - Type: uint8 */
+
+    float deltaTau;
+    /**<   Time difference between navigation RF signal transmitted in L2 sub-band \n
+       and aviation RF signal transmitted in L1 sub-band. \n
+       - Type: floating point
+       - Units: Seconds */
+
+    double position[3];
+    /**<   Satellite XYZ position. \n
+       - Type: array of doubles
+       - Units: Meters */
+
+    double velocity[3];
+    /**<   Satellite XYZ velocity. \n
+       - Type: array of doubles
+       - Units: Meters/Second */
+
+    double acceleration[3];
+    /**<   Satellite XYZ sola-luni acceleration. \n
+       - Type: array of doubles
+       - Units: Meters/Second^2 */
+
+    float tauN;
+    /**<   Satellite clock correction relative to GLONASS time. \n
+       - Type: floating point
+       - Units: Seconds */
+
+    float gamma;
+    /**<   Relative deviation of predicted carrier frequency value \n
+       from nominal value at the instant tb. \n
+       - Type: floating point
+       - Units: Unit-less */
+
+    double toe;
+    /**<   Complete ephemeris time, including N4, NT and Tb. \n
+       [(N4-1)*1461 + (NT-1)]*86400 + tb*900 \n
+       - Type: double
+       - Units: Seconds */
+
+    uint16_t nt;
+    /**<   Current date, calendar number of day within four-year interval. \n
+       Starting from the 1-st of January in a leap year. \n
+       - Type: uint16
+       - Units: Days */
+} GlonassEphemeris;
+
+/* BDS Navigation Model Info */
+typedef struct {
+
+    GnssEphCommon commonEphemerisData;
+    /**<   Common ephemeris data.   */
+
+    uint8_t svHealth;
+    /**<   Satellite health information applied to both B1 and B2 (SatH1). \n
+       - Type: uint8
+       Valid Values: \n
+       - 0 : Healthy
+       - 1 : Unhealthy */
+
+    uint8_t AODC;
+    /**<   Age of data clock. \n
+       - Type: uint8
+       - Units: Hours */
+
+    double tgd1;
+    /**<   Equipment group delay differential on B1 signal. \n
+       - Type: double
+       - Units: Nano-Seconds */
+
+    double tgd2;
+    /**<   Equipment group delay differential on B2 signal. \n
+       - Type: double
+       - Units: Nano-Seconds */
+
+    uint8_t URAI;
+    /**<   User range accuracy index (4-bits). \n
+       - Type: uint8
+       - Units: Unit-less */
+} BdsEphemeris;
+
+/* GALIELO Navigation Model Info */
+typedef struct {
+
+    GnssEphCommon commonEphemerisData;
+    /**<   Common ephemeris data.   */
+
+    GalEphSignalSource dataSourceSignal;
+    /**<   Galileo Signal Source. \n
+    Valid Values: \n
+      - GAL_EPH_SIGNAL_SRC_UNKNOWN (0) --  GALILEO signal is unknown
+      - GAL_EPH_SIGNAL_SRC_E1B (1) --  GALILEO signal is E1B
+      - GAL_EPH_SIGNAL_SRC_E5A (2) --  GALILEO signal is E5A
+      - GAL_EPH_SIGNAL_SRC_E5B (3) --  GALILEO signal is E5B  */
+
+    uint8_t sisIndex;
+    /**<   Signal-in-space index for dual frequency E1-E5b/E5a depending on dataSignalSource. \n
+       - Type: uint8
+       - Units: Unit-less */
+
+    double bgdE1E5a;
+    /**<   E1-E5a Broadcast group delay from F/Nav (E5A). \n
+       - Type: double
+       - Units: Seconds */
+
+    double bgdE1E5b;
+    /**<   E1-E5b Broadcast group delay from I/Nav (E1B or E5B). \n
+       For E1B or E5B signal, both bgdE1E5a and bgdE1E5b are valid. \n
+       For E5A signal, only bgdE1E5a is valid. \n
+       Signal source identified using dataSignalSource. \n
+       - Type: double
+       - Units: Seconds */
+
+    uint8_t svHealth;
+    /**<   SV health status of signal identified by dataSourceSignal. \n
+       - Type: uint8
+       Valid Values: \n
+       - 0 : Healthy
+       - 1 : Unhealthy */
+} GalileoEphemeris;
+
+/** GPS Navigation model for each SV */
+typedef struct {
+    uint16_t numOfEphemeris;
+    GpsEphemeris gpsEphemerisData[GNSS_EPHEMERIS_LIST_MAX_SIZE_V02];
+} GpsEphemerisResponse;
+
+/** GLONASS Navigation model for each SV */
+typedef struct {
+    uint16_t numOfEphemeris;
+    GlonassEphemeris gloEphemerisData[GNSS_EPHEMERIS_LIST_MAX_SIZE_V02];
+} GlonassEphemerisResponse;
+
+/** BDS Navigation model for each SV */
+typedef struct {
+    uint16_t numOfEphemeris;
+    BdsEphemeris bdsEphemerisData[GNSS_EPHEMERIS_LIST_MAX_SIZE_V02];
+} BdsEphemerisResponse;
+
+/** GALILEO Navigation model for each SV */
+typedef struct {
+    uint16_t numOfEphemeris;
+    GalileoEphemeris galEphemerisData[GNSS_EPHEMERIS_LIST_MAX_SIZE_V02];
+} GalileoEphemerisResponse;
+
+/** QZSS Navigation model for each SV */
+typedef struct {
+    uint16_t numOfEphemeris;
+    GpsEphemeris qzssEphemerisData[GNSS_EPHEMERIS_LIST_MAX_SIZE_V02];
+} QzssEphemerisResponse;
+
+
+typedef struct {
+    /** Indicates GNSS Constellation Type
+        Mandatory field */
+    Gnss_LocSvSystemEnumType gnssConstellation;
+
+    /** GPS System Time of the ephemeris report */
+    bool isSystemTimeValid;
+    GnssSystemTimeStructType systemTime;
+
+    union {
+       /** GPS Ephemeris */
+       GpsEphemerisResponse gpsEphemeris;
+       /** GLONASS Ephemeris */
+       GlonassEphemerisResponse glonassEphemeris;
+       /** BDS Ephemeris */
+       BdsEphemerisResponse bdsEphemeris;
+       /** GALILEO Ephemeris */
+       GalileoEphemerisResponse galileoEphemeris;
+       /** QZSS Ephemeris */
+       QzssEphemerisResponse qzssEphemeris;
+    } ephInfo;
+} GnssSvEphemerisReport;
+
+typedef struct {
+    /** GPS System Time of the iono model report */
+    bool isSystemTimeValid;
+    GnssSystemTimeStructType systemTime;
+
+    /** Indicates GNSS Constellation Type */
+    Gnss_LocSvSystemEnumType gnssConstellation;
+
+    float alpha0;
+    /**<   Klobuchar Model Parameter Alpha 0.
+         - Type: float
+         - Unit: Seconds
+    */
+
+    float alpha1;
+    /**<   Klobuchar Model Parameter Alpha 1.
+         - Type: float
+         - Unit: Seconds / Semi-Circle
+    */
+
+    float alpha2;
+    /**<   Klobuchar Model Parameter Alpha 2.
+         - Type: float
+         - Unit: Seconds / Semi-Circle^2
+    */
+
+    float alpha3;
+    /**<   Klobuchar Model Parameter Alpha 3.
+         - Type: float
+         - Unit: Seconds / Semi-Circle^3
+    */
+
+    float beta0;
+    /**<   Klobuchar Model Parameter Beta 0.
+         - Type: float
+         - Unit: Seconds
+    */
+
+    float beta1;
+    /**<   Klobuchar Model Parameter Beta 1.
+         - Type: float
+         - Unit: Seconds / Semi-Circle
+    */
+
+    float beta2;
+    /**<   Klobuchar Model Parameter Beta 2.
+         - Type: float
+         - Unit: Seconds / Semi-Circle^2
+    */
+
+    float beta3;
+    /**<   Klobuchar Model Parameter Beta 3.
+         - Type: float
+         - Unit: Seconds / Semi-Circle^3
+    */
+} GnssKlobucharIonoModel;
+
+typedef struct {
+        /** GPS System Time of the report */
+    bool isSystemTimeValid;
+    GnssSystemTimeStructType systemTime;
+
+    GnssAdditionalSystemInfoMask validityMask;
+    double tauC;
+    int8_t leapSec;
+} GnssAdditionalSystemInfo;
+
+/* Various Short Range Node Technology type*/
+typedef enum {
+    SRN_AP_DATA_TECH_TYPE_NONE,
+    SRN_AP_DATA_TECH_TYPE_BT,
+    SRN_AP_DATA_TECH_TYPE_BTLE,
+    SRN_AP_DATA_TECH_TYPE_NFC,
+    SRN_AP_DATA_TECH_TYPE_MOBILE_CODE,
+    SRN_AP_DATA_TECH_TYPE_OTHER
+} Gnss_SrnTech;
+
+/* Mac Address type requested by modem */
+typedef enum {
+    SRN_AP_DATA_PUBLIC_MAC_ADDR_TYPE_INVALID, /* No valid mac address type send */
+    SRN_AP_DATA_PUBLIC_MAC_ADDR_TYPE_PUBLIC, /* SRN AP MAC Address type PUBLIC  */
+    SRN_AP_DATA_PUBLIC_MAC_ADDR_TYPE_PRIVATE, /* SRN AP MAC Address type PRIVATE  */
+    SRN_AP_DATA_PUBLIC_MAC_ADDR_TYPE_OTHER, /* SRN AP MAC Address type OTHER  */
+}Gnss_Srn_MacAddr_Type;
+
+typedef struct
+{
+    uint32_t                 size;
+    Gnss_SrnTech           srnTechType; /* SRN Technology type in request */
+    bool                   srnRequest; /* scan - start(true) or stop(false) */
+    bool                   e911Mode; /* If in E911 emergency */
+    Gnss_Srn_MacAddr_Type  macAddrType; /* SRN AP MAC Address type */
+} GnssSrnDataReq;
+
+/* Provides the current GNSS SV Type configuration to the client.
+ * This is fetched via direct call to GNSS Adapter bypassing
+ * Location API */
+typedef std::function<void(
+    const GnssSvTypeConfig& config
+)> GnssSvTypeConfigCallback;
+
+/*
+ * Represents the status of AGNSS augmented to support IPv4.
+ */
+struct AGnssExtStatusIpV4 {
+    AGpsExtType         type;
+    LocApnTypeMask      apnTypeMask;
+    LocAGpsStatusValue  status;
+    /*
+     * 32-bit IPv4 address.
+     */
+    uint32_t            ipV4Addr;
+};
+
+/*
+ * Represents the status of AGNSS augmented to support IPv6.
+ */
+struct AGnssExtStatusIpV6 {
+    AGpsExtType         type;
+    LocApnTypeMask      apnTypeMask;
+    LocAGpsStatusValue  status;
+    /*
+     * 128-bit IPv6 address.
+     */
+    uint8_t             ipV6Addr[16];
+};
+
+/*
+* Represents the the Nfw Notification structure
+*/
+#define GNSS_MAX_NFW_APP_STRING_LEN 64
+#define GNSS_MAX_NFW_STRING_LEN  20
+
+typedef enum {
+    GNSS_NFW_CTRL_PLANE = 0,
+    GNSS_NFW_SUPL = 1,
+    GNSS_NFW_IMS = 10,
+    GNSS_NFW_SIM = 11,
+    GNSS_NFW_OTHER_PROTOCOL_STACK = 100
+} GnssNfwProtocolStack;
+
+typedef enum {
+    GNSS_NFW_CARRIER = 0,
+    GNSS_NFW_OEM = 10,
+    GNSS_NFW_MODEM_CHIPSET_VENDOR = 11,
+    GNSS_NFW_GNSS_CHIPSET_VENDOR = 12,
+    GNSS_NFW_OTHER_CHIPSET_VENDOR = 13,
+    GNSS_NFW_AUTOMOBILE_CLIENT = 20,
+    GNSS_NFW_OTHER_REQUESTOR = 100
+} GnssNfwRequestor;
+
+typedef enum {
+    GNSS_NFW_REJECTED = 0,
+    GNSS_NFW_ACCEPTED_NO_LOCATION_PROVIDED = 1,
+    GNSS_NFW_ACCEPTED_LOCATION_PROVIDED = 2,
+} GnssNfwResponseType;
+
+typedef struct {
+    char                    proxyAppPackageName[GNSS_MAX_NFW_APP_STRING_LEN];
+    GnssNfwProtocolStack    protocolStack;
+    char                    otherProtocolStackName[GNSS_MAX_NFW_STRING_LEN];
+    GnssNfwRequestor        requestor;
+    char                    requestorId[GNSS_MAX_NFW_STRING_LEN];
+    GnssNfwResponseType     responseType;
+    bool                    inEmergencyMode;
+    bool                    isCachedLocation;
+} GnssNfwNotification;
+
+typedef uint16_t GnssMeasurementCorrectionsCapabilitiesMask;
+typedef enum {
+    GNSS_MEAS_CORR_LOS_SATS            = 1 << 0,
+    GNSS_MEAS_CORR_EXCESS_PATH_LENGTH  = 1 << 1,
+    GNSS_MEAS_CORR_REFLECTING_PLANE    = 1 << 2,
+} GnssMeasurementCorrectionsCapabilities;
+
+/* Represents GNSS NMEA Report Rate Configuration */
+typedef enum {
+    GNSS_NMEA_REPORT_RATE_UNKNOWN  = 0,
+    GNSS_NMEA_REPORT_RATE_1HZ  = 1,
+    GNSS_NMEA_REPORT_RATE_NHZ  = 2
+} GnssNMEARptRate;
+
+/* ODCPI Request Info */
+enum OdcpiRequestType {
+    ODCPI_REQUEST_TYPE_START,
+    ODCPI_REQUEST_TYPE_STOP
+};
+struct OdcpiRequestInfo {
+    uint32_t size;
+    OdcpiRequestType type;
+    uint32_t tbfMillis;
+    bool isEmergencyMode;
+};
+/* Callback to send ODCPI request to framework */
+typedef std::function<void(const OdcpiRequestInfo& request)> OdcpiRequestCallback;
+
+/* ODCPI callback priorities*/
+enum OdcpiPrioritytype {
+    ODCPI_HANDLER_PRIORITY_LOW,
+    ODCPI_HANDLER_PRIORITY_HIGH
+};
+
+/*
+ * Callback with AGNSS(IpV4) status information.
+ *
+ * @param status Will be of type AGnssExtStatusIpV4.
+ */
+typedef void (*AgnssStatusIpV4Cb)(AGnssExtStatusIpV4 status);
+
+/*
+* Callback with AGNSS(IpV6) status information.
+*
+* @param status Will be of type AGnssExtStatusIpV6.
+*/
+typedef void (*AgnssStatusIpV6Cb)(AGnssExtStatusIpV6 status);
+
+/*
+* Callback with NFW information.
+*/
+typedef void(*NfwStatusCb)(GnssNfwNotification notification);
+typedef bool(*IsInEmergencySession)(void);
+
+enum AntennaInfoStatus {
+    ANTENNA_INFO_SUCCESS = 0,
+    ANTENNA_INFO_ERROR_ALREADY_INIT = 1,
+    ANTENNA_INFO_ERROR_GENERIC = 2
+};
+
+/*
+* Callback with Measurement corrections information.
+*/
+typedef void(*measCorrSetCapabilitiesCb)(GnssMeasurementCorrectionsCapabilitiesMask capabilities);
+
+/*
+ * Callback with AGNSS(IpV6) status information.
+ *
+ * @param status Will be of type AGnssExtStatusIpV6.
+ */
+typedef void (*AgnssStatusIpV6Cb)(AGnssExtStatusIpV6 status);
+
+/*
+* Callback with Antenna information.
+*/
+typedef void(*antennaInfoCb)(std::vector<GnssAntennaInformation> gnssAntennaInformations);
+
+/* Constructs for interaction with loc_net_iface library */
+typedef void (*LocAgpsOpenResultCb)(bool isSuccess, AGpsExtType agpsType, const char* apn,
+        AGpsBearerType bearerType, void* userDataPtr);
+
+typedef void (*LocAgpsCloseResultCb)(bool isSuccess, AGpsExtType agpsType, void* userDataPtr);
+
+enum PowerStateType {
+    POWER_STATE_UNKNOWN = 0,
+    POWER_STATE_SUSPEND = 1,
+    POWER_STATE_RESUME  = 2,
+    POWER_STATE_SHUTDOWN = 3
+};
+
+/* Shared resources of LocIpc */
+#define LOC_IPC_HAL                    "/dev/socket/location/socket_hal"
+#define LOC_IPC_XTRA                   "/dev/socket/location/xtra/socket_xtra"
+
+#define SOCKET_DIR_LOCATION            "/dev/socket/location/"
+#define SOCKET_DIR_EHUB                "/dev/socket/location/ehub/"
+#define SOCKET_TO_LOCATION_HAL_DAEMON  "/dev/socket/loc_client/hal_daemon"
+
+#define SOCKET_LOC_CLIENT_DIR          "/dev/socket/loc_client/"
+#define EAP_LOC_CLIENT_DIR             "/data/vendor/location/extap_locclient/"
+
+#define LOC_CLIENT_NAME_PREFIX         "toclient"
+// Please note that the socket name for all location hal daemon client need
+// to start with LOC_CLIENT_NAME_PREFIX so that upon hal daemon restarts,
+// every client can get the notification that hal daemon has restarted.
+#define LOC_INTAPI_NAME_PREFIX         LOC_CLIENT_NAME_PREFIX "_intapi"
+
+typedef uint64_t NetworkHandle;
+#define NETWORK_HANDLE_UNKNOWN  ~0
+#define MAX_NETWORK_HANDLES 10
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* GPS_EXTENDED_C_H */
diff --git a/gps/utils/linked_list.c b/gps/utils/linked_list.c
new file mode 100644
index 0000000..02e1463
--- /dev/null
+++ b/gps/utils/linked_list.c
@@ -0,0 +1,325 @@
+/* Copyright (c) 2011, 2014, 2017 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#define LOG_TAG "LocSvc_utils_ll"
+
+#include "linked_list.h"
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <loc_pla.h>
+#include <log_util.h>
+
+typedef struct list_element {
+   struct list_element* next;
+   struct list_element* prev;
+   void* data_ptr;
+   void (*dealloc_func)(void*);
+}list_element;
+
+typedef struct list_state {
+   list_element* p_head;
+   list_element* p_tail;
+} list_state;
+
+/* ----------------------- END INTERNAL FUNCTIONS ---------------------------------------- */
+
+/*===========================================================================
+
+  FUNCTION:   linked_list_init
+
+  ===========================================================================*/
+linked_list_err_type linked_list_init(void** list_data)
+{
+   if( list_data == NULL )
+   {
+      LOC_LOGE("%s: Invalid list parameter!\n", __FUNCTION__);
+      return eLINKED_LIST_INVALID_PARAMETER;
+   }
+
+   list_state* tmp_list;
+   tmp_list = (list_state*)calloc(1, sizeof(list_state));
+   if( tmp_list == NULL )
+   {
+      LOC_LOGE("%s: Unable to allocate space for list!\n", __FUNCTION__);
+      return eLINKED_LIST_FAILURE_GENERAL;
+   }
+
+   tmp_list->p_head = NULL;
+   tmp_list->p_tail = NULL;
+
+   *list_data = tmp_list;
+
+   return eLINKED_LIST_SUCCESS;
+}
+
+/*===========================================================================
+
+  FUNCTION:   linked_list_destroy
+
+  ===========================================================================*/
+linked_list_err_type linked_list_destroy(void** list_data)
+{
+   if( list_data == NULL )
+   {
+      LOC_LOGE("%s: Invalid list parameter!\n", __FUNCTION__);
+      return eLINKED_LIST_INVALID_HANDLE;
+   }
+
+   list_state* p_list = (list_state*)*list_data;
+
+   linked_list_flush(p_list);
+
+   free(*list_data);
+   *list_data = NULL;
+
+   return eLINKED_LIST_SUCCESS;
+}
+
+/*===========================================================================
+
+  FUNCTION:   linked_list_add
+
+  ===========================================================================*/
+linked_list_err_type linked_list_add(void* list_data, void *data_obj, void (*dealloc)(void*))
+{
+   if( list_data == NULL )
+   {
+      LOC_LOGE("%s: Invalid list parameter!\n", __FUNCTION__);
+      return eLINKED_LIST_INVALID_HANDLE;
+   }
+
+   if( data_obj == NULL )
+   {
+      LOC_LOGE("%s: Invalid input parameter!\n", __FUNCTION__);
+      return eLINKED_LIST_INVALID_PARAMETER;
+   }
+
+   list_state* p_list = (list_state*)list_data;
+   list_element* elem = (list_element*)malloc(sizeof(list_element));
+   if( elem == NULL )
+   {
+      LOC_LOGE("%s: Memory allocation failed\n", __FUNCTION__);
+      return eLINKED_LIST_FAILURE_GENERAL;
+   }
+
+   /* Copy data to newly created element */
+   elem->data_ptr = data_obj;
+   elem->next = NULL;
+   elem->prev = NULL;
+   elem->dealloc_func = dealloc;
+
+   /* Replace head element */
+   list_element* tmp = p_list->p_head;
+   p_list->p_head = elem;
+   /* Point next to the previous head element */
+   p_list->p_head->next = tmp;
+
+   if( tmp != NULL )
+   {
+      tmp->prev = p_list->p_head;
+   }
+   else
+   {
+      p_list->p_tail = p_list->p_head;
+   }
+
+   return eLINKED_LIST_SUCCESS;
+}
+
+/*===========================================================================
+
+  FUNCTION:   linked_list_remove
+
+  ===========================================================================*/
+linked_list_err_type linked_list_remove(void* list_data, void **data_obj)
+{
+   if( list_data == NULL )
+   {
+      LOC_LOGE("%s: Invalid list parameter!\n", __FUNCTION__);
+      return eLINKED_LIST_INVALID_HANDLE;
+   }
+
+   if( data_obj == NULL )
+   {
+      LOC_LOGE("%s: Invalid input parameter!\n", __FUNCTION__);
+      return eLINKED_LIST_INVALID_PARAMETER;
+   }
+
+   list_state* p_list = (list_state*)list_data;
+   if( p_list->p_tail == NULL )
+   {
+      return eLINKED_LIST_UNAVAILABLE_RESOURCE;
+   }
+
+   list_element* tmp = p_list->p_tail;
+
+   /* Replace tail element */
+   p_list->p_tail = tmp->prev;
+
+   if( p_list->p_tail != NULL )
+   {
+      p_list->p_tail->next = NULL;
+   }
+   else
+   {
+      p_list->p_head = p_list->p_tail;
+   }
+
+   /* Copy data to output param */
+   *data_obj = tmp->data_ptr;
+
+   /* Free allocated list element */
+   free(tmp);
+
+   return eLINKED_LIST_SUCCESS;
+}
+
+/*===========================================================================
+
+  FUNCTION:   linked_list_empty
+
+  ===========================================================================*/
+int linked_list_empty(void* list_data)
+{
+   if( list_data == NULL )
+   {
+      LOC_LOGE("%s: Invalid list parameter!\n", __FUNCTION__);
+      return (int)eLINKED_LIST_INVALID_HANDLE;
+   }
+   else
+   {
+      list_state* p_list = (list_state*)list_data;
+      return p_list->p_head == NULL ? 1 : 0;
+   }
+}
+
+/*===========================================================================
+
+  FUNCTION:   linked_list_flush
+
+  ===========================================================================*/
+linked_list_err_type linked_list_flush(void* list_data)
+{
+   if( list_data == NULL )
+   {
+      LOC_LOGE("%s: Invalid list parameter!\n", __FUNCTION__);
+      return eLINKED_LIST_INVALID_HANDLE;
+   }
+
+   list_state* p_list = (list_state*)list_data;
+
+   /* Remove all dynamically allocated elements */
+   while( p_list->p_head != NULL )
+   {
+      list_element* tmp = p_list->p_head->next;
+
+      /* Free data pointer if told to do so. */
+      if( p_list->p_head->dealloc_func != NULL )
+      {
+         p_list->p_head->dealloc_func(p_list->p_head->data_ptr);
+      }
+
+      /* Free list element */
+      free(p_list->p_head);
+
+      p_list->p_head = tmp;
+   }
+
+   p_list->p_tail = NULL;
+
+   return eLINKED_LIST_SUCCESS;
+}
+
+/*===========================================================================
+
+  FUNCTION:   linked_list_search
+
+  ===========================================================================*/
+linked_list_err_type linked_list_search(void* list_data, void **data_p,
+                                        bool (*equal)(void* data_0, void* data),
+                                        void* data_0, bool rm_if_found)
+{
+   if( list_data == NULL || NULL == equal )
+   {
+      LOC_LOGE("%s: Invalid list parameter! list_data %p equal %p\n",
+               __FUNCTION__, list_data, equal);
+      return eLINKED_LIST_INVALID_HANDLE;
+   }
+
+   list_state* p_list = (list_state*)list_data;
+   if( p_list->p_tail == NULL )
+   {
+      return eLINKED_LIST_UNAVAILABLE_RESOURCE;
+   }
+
+   list_element* tmp = p_list->p_head;
+
+   if (NULL != data_p) {
+     *data_p = NULL;
+   }
+
+   while (NULL != tmp) {
+     if ((*equal)(data_0, tmp->data_ptr)) {
+       if (NULL != data_p) {
+         *data_p = tmp->data_ptr;
+       }
+
+       if (rm_if_found) {
+         if (NULL == tmp->prev) {
+           p_list->p_head = tmp->next;
+         } else {
+           tmp->prev->next = tmp->next;
+         }
+
+         if (NULL == tmp->next) {
+           p_list->p_tail = tmp->prev;
+         } else {
+           tmp->next->prev = tmp->prev;
+         }
+
+         tmp->prev = tmp->next = NULL;
+
+         // dealloc data if it is not copied out && caller
+         // has given us a dealloc function pointer.
+         if (NULL == data_p && NULL != tmp->dealloc_func) {
+             tmp->dealloc_func(tmp->data_ptr);
+         }
+         free(tmp);
+       }
+
+       tmp = NULL;
+     } else {
+       tmp = tmp->next;
+     }
+   }
+
+   return eLINKED_LIST_SUCCESS;
+}
+
diff --git a/gps/utils/linked_list.h b/gps/utils/linked_list.h
new file mode 100644
index 0000000..0b33ecb
--- /dev/null
+++ b/gps/utils/linked_list.h
@@ -0,0 +1,219 @@
+/* Copyright (c) 2011, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef __LINKED_LIST_H__
+#define __LINKED_LIST_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#include <stdbool.h>
+#include <stdlib.h>
+
+/** Linked List Return Codes */
+typedef enum
+{
+  eLINKED_LIST_SUCCESS                             = 0,
+     /**< Request was successful. */
+  eLINKED_LIST_FAILURE_GENERAL                     = -1,
+     /**< Failed because of a general failure. */
+  eLINKED_LIST_INVALID_PARAMETER                   = -2,
+     /**< Failed because the request contained invalid parameters. */
+  eLINKED_LIST_INVALID_HANDLE                      = -3,
+     /**< Failed because an invalid handle was specified. */
+  eLINKED_LIST_UNAVAILABLE_RESOURCE                = -4,
+     /**< Failed because an there were not enough resources. */
+  eLINKED_LIST_INSUFFICIENT_BUFFER                 = -5,
+     /**< Failed because an the supplied buffer was too small. */
+  eLINKED_LIST_EMPTY                               = -6
+     /**< Failed because list is empty. */
+}linked_list_err_type;
+
+/*===========================================================================
+FUNCTION    linked_list_init
+
+DESCRIPTION
+   Initializes internal structures for linked list.
+
+   list_data: State of list to be initialized.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+linked_list_err_type linked_list_init(void** list_data);
+
+/*===========================================================================
+FUNCTION    linked_list_destroy
+
+DESCRIPTION
+   Destroys internal structures for linked list.
+
+   p_list_data: State of list to be destroyed.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+linked_list_err_type linked_list_destroy(void** list_data);
+
+/*===========================================================================
+FUNCTION    linked_list_add
+
+DESCRIPTION
+   Adds an element to the head of the linked list. The passed in data pointer
+   is not modified or freed. Passed in data_obj is expected to live throughout
+   the use of the linked_list (i.e. data is not allocated internally)
+
+   p_list_data:  List to add data to the head of.
+   data_obj:     Pointer to data to add into list
+   dealloc:      Function used to deallocate memory for this element. Pass NULL
+                 if you do not want data deallocated during a flush operation
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+linked_list_err_type linked_list_add(void* list_data, void *data_obj, void (*dealloc)(void*));
+
+/*===========================================================================
+FUNCTION    linked_list_remove
+
+DESCRIPTION
+   Retrieves data from the list tail. data_obj is the tail element from the list
+   passed in by linked_list_add.
+
+   p_list_data:  List to remove the tail from.
+   data_obj:     Pointer to data removed from list
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+linked_list_err_type linked_list_remove(void* list_data, void **data_obj);
+
+/*===========================================================================
+FUNCTION    linked_list_empty
+
+DESCRIPTION
+   Tells whether the list currently contains any elements
+
+   p_list_data:  List to check if empty.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   0/FALSE : List contains elements
+   1/TRUE  : List is Empty
+   Otherwise look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+int linked_list_empty(void* list_data);
+
+/*===========================================================================
+FUNCTION    linked_list_flush
+
+DESCRIPTION
+   Removes all elements from the list and deallocates them using the provided
+   dealloc function while adding elements.
+
+   p_list_data:  List to remove all elements from.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+linked_list_err_type linked_list_flush(void* list_data);
+
+/*===========================================================================
+FUNCTION    linked_list_search
+
+DESCRIPTION
+   Searches for an element in the linked list.
+
+   p_list_data:  List handle.
+   data_p:       to be stored with the data found; NUll if no match.
+                 if data_p passed in as NULL, then no write to it.
+   equal:        Function ptr takes in a list element, and returns
+                 indication if this the one looking for.
+   data_0:       The data being compared against.
+   rm_if_found:  Should data be removed if found?
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+linked_list_err_type linked_list_search(void* list_data, void **data_p,
+                                        bool (*equal)(void* data_0, void* data),
+                                        void* data_0, bool rm_if_found);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __LINKED_LIST_H__ */
diff --git a/gps/utils/loc_cfg.cpp b/gps/utils/loc_cfg.cpp
new file mode 100644
index 0000000..2a89966
--- /dev/null
+++ b/gps/utils/loc_cfg.cpp
@@ -0,0 +1,1140 @@
+/* Copyright (c) 2011-2015, 2018-2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#define LOG_NDEBUG 0
+#define LOG_TAG "LocSvc_utils_cfg"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <time.h>
+#include <grp.h>
+#include <errno.h>
+#include <loc_cfg.h>
+#include <loc_pla.h>
+#include <loc_target.h>
+#include <loc_misc_utils.h>
+#ifdef USE_GLIB
+#include <glib.h>
+#endif
+#include "log_util.h"
+
+/*=============================================================================
+ *
+ *                          GLOBAL DATA DECLARATION
+ *
+ *============================================================================*/
+
+/* Parameter data */
+static uint32_t DEBUG_LEVEL = 0xff;
+static uint32_t TIMESTAMP = 0;
+static uint32_t DATUM_TYPE = 0;
+static bool sVendorEnhanced = true;
+static uint32_t sLogBufferEnabled = 0;
+
+/* Parameter spec table */
+static const loc_param_s_type loc_param_table[] =
+{
+    {"DEBUG_LEVEL",             &DEBUG_LEVEL,        NULL, 'n'},
+    {"TIMESTAMP",               &TIMESTAMP,          NULL, 'n'},
+    {"DATUM_TYPE",              &DATUM_TYPE,         NULL, 'n'},
+    {"LOG_BUFFER_ENABLED",      &sLogBufferEnabled,  NULL, 'n'},
+};
+static const int loc_param_num = sizeof(loc_param_table) / sizeof(loc_param_s_type);
+
+typedef struct loc_param_v_type
+{
+    char* param_name;
+    char* param_str_value;
+    int param_int_value;
+    double param_double_value;
+}loc_param_v_type;
+
+// Reference below arrays wherever needed to avoid duplicating
+// same conf path string over and again in location code.
+const char LOC_PATH_GPS_CONF[] = LOC_PATH_GPS_CONF_STR;
+const char LOC_PATH_IZAT_CONF[] = LOC_PATH_IZAT_CONF_STR;
+const char LOC_PATH_FLP_CONF[] = LOC_PATH_FLP_CONF_STR;
+const char LOC_PATH_LOWI_CONF[] = LOC_PATH_LOWI_CONF_STR;
+const char LOC_PATH_SAP_CONF[] = LOC_PATH_SAP_CONF_STR;
+const char LOC_PATH_APDR_CONF[] = LOC_PATH_APDR_CONF_STR;
+const char LOC_PATH_XTWIFI_CONF[] = LOC_PATH_XTWIFI_CONF_STR;
+const char LOC_PATH_QUIPC_CONF[] = LOC_PATH_QUIPC_CONF_STR;
+const char LOC_PATH_ANT_CORR[] = LOC_PATH_ANT_CORR_STR;
+const char LOC_PATH_SLIM_CONF[] = LOC_PATH_SLIM_CONF_STR;
+const char LOC_PATH_VPE_CONF[] = LOC_PATH_VPE_CONF_STR;
+
+bool isVendorEnhanced() {
+    return sVendorEnhanced;
+}
+void setVendorEnhanced(bool vendorEnhanced) {
+    sVendorEnhanced = vendorEnhanced;
+}
+
+/*===========================================================================
+FUNCTION loc_get_datum_type
+
+DESCRIPTION
+   get datum type
+
+PARAMETERS:
+   N/A
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   DATUM TYPE
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+int loc_get_datum_type()
+{
+    return DATUM_TYPE;
+}
+
+/*===========================================================================
+FUNCTION loc_set_config_entry
+
+DESCRIPTION
+   Potentially sets a given configuration table entry based on the passed in
+   configuration value. This is done by using a string comparison of the
+   parameter names and those found in the configuration file.
+
+PARAMETERS:
+   config_entry: configuration entry in the table to possibly set
+   config_value: value to store in the entry if the parameter names match
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   None
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+int loc_set_config_entry(const loc_param_s_type* config_entry,
+                        loc_param_v_type* config_value,
+                        uint16_t string_len = LOC_MAX_PARAM_STRING)
+{
+    int ret=-1;
+    if(NULL == config_entry || NULL == config_value)
+    {
+        LOC_LOGE("%s: INVALID config entry or parameter", __FUNCTION__);
+        return ret;
+    }
+
+    if (strcmp(config_entry->param_name, config_value->param_name) == 0 &&
+        config_entry->param_ptr)
+    {
+        switch (config_entry->param_type)
+        {
+        case 's':
+            if (strcmp(config_value->param_str_value, "NULL") == 0)
+            {
+                *((char*)config_entry->param_ptr) = '\0';
+            }
+            else {
+                strlcpy((char*) config_entry->param_ptr,
+                        config_value->param_str_value,
+                        string_len);
+            }
+            /* Log INI values */
+            LOC_LOGD("%s: PARAM %s = %s", __FUNCTION__,
+                     config_entry->param_name, (char*)config_entry->param_ptr);
+
+            if(NULL != config_entry->param_set)
+            {
+                *(config_entry->param_set) = 1;
+            }
+            ret = 0;
+            break;
+        case 'n':
+            *((int *)config_entry->param_ptr) = config_value->param_int_value;
+            /* Log INI values */
+            LOC_LOGD("%s: PARAM %s = %d", __FUNCTION__,
+                     config_entry->param_name, config_value->param_int_value);
+
+            if(NULL != config_entry->param_set)
+            {
+                *(config_entry->param_set) = 1;
+            }
+            ret = 0;
+            break;
+        case 'f':
+            *((double *)config_entry->param_ptr) = config_value->param_double_value;
+            /* Log INI values */
+            LOC_LOGD("%s: PARAM %s = %f", __FUNCTION__,
+                     config_entry->param_name, config_value->param_double_value);
+
+            if(NULL != config_entry->param_set)
+            {
+                *(config_entry->param_set) = 1;
+            }
+            ret = 0;
+            break;
+        default:
+            LOC_LOGE("%s: PARAM %s parameter type must be n, f, or s",
+                     __FUNCTION__, config_entry->param_name);
+        }
+    }
+    return ret;
+}
+
+/*===========================================================================
+FUNCTION loc_fill_conf_item
+
+DESCRIPTION
+   Takes a line of configuration item and sets defined values based on
+   the passed in configuration table. This table maps strings to values to
+   set along with the type of each of these values.
+
+PARAMETERS:
+   input_buf : buffer contanis config item
+   config_table: table definition of strings to places to store information
+   table_length: length of the configuration table
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   0: Number of records in the config_table filled with input_buf
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+int loc_fill_conf_item(char* input_buf,
+                       const loc_param_s_type* config_table,
+                       uint32_t table_length, uint16_t string_len = LOC_MAX_PARAM_STRING)
+{
+    int ret = 0;
+
+    if (input_buf && config_table) {
+        char *lasts;
+        loc_param_v_type config_value;
+        memset(&config_value, 0, sizeof(config_value));
+
+        /* Separate variable and value */
+        config_value.param_name = strtok_r(input_buf, "=", &lasts);
+        /* skip lines that do not contain "=" */
+        if (config_value.param_name) {
+            config_value.param_str_value = strtok_r(NULL, "\0", &lasts);
+
+            /* skip lines that do not contain two operands */
+            if (config_value.param_str_value) {
+                /* Trim leading and trailing spaces */
+                loc_util_trim_space(config_value.param_name);
+                loc_util_trim_space(config_value.param_str_value);
+
+                /* Parse numerical value */
+                if ((strlen(config_value.param_str_value) >=3) &&
+                    (config_value.param_str_value[0] == '0') &&
+                    (tolower(config_value.param_str_value[1]) == 'x'))
+                {
+                    /* hex */
+                    config_value.param_int_value = (int) strtol(&config_value.param_str_value[2],
+                                                                (char**) NULL, 16);
+                }
+                else {
+                    config_value.param_double_value = (double) atof(config_value.param_str_value); /* float */
+                    config_value.param_int_value = atoi(config_value.param_str_value); /* dec */
+                }
+
+                for(uint32_t i = 0; NULL != config_table && i < table_length; i++)
+                {
+                    if(!loc_set_config_entry(&config_table[i], &config_value, string_len)) {
+                        ret += 1;
+                    }
+                }
+            }
+        }
+    }
+
+    return ret;
+}
+
+/*===========================================================================
+FUNCTION loc_read_conf_r_long (repetitive)
+
+DESCRIPTION
+   Reads the specified configuration file and sets defined values based on
+   the passed in configuration table. This table maps strings to values to
+   set along with the type of each of these values.
+   The difference between this and loc_read_conf is that this function returns
+   the file pointer position at the end of filling a config table. Also, it
+   reads a fixed number of parameters at a time which is equal to the length
+   of the configuration table. This functionality enables the caller to
+   repeatedly call the function to read data from the same file.
+
+PARAMETERS:
+   conf_fp : file pointer
+   config_table: table definition of strings to places to store information
+   table_length: length of the configuration table
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   0: Table filled successfully
+   1: No more parameters to read
+  -1: Error filling table
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+int loc_read_conf_r_long(FILE *conf_fp, const loc_param_s_type* config_table,
+                         uint32_t table_length, uint16_t string_len)
+{
+    int ret=0;
+    char input_buf[string_len];  /* declare a char array */
+    unsigned int num_params=table_length;
+
+    if(conf_fp == NULL) {
+        LOC_LOGE("%s:%d]: ERROR: File pointer is NULL\n", __func__, __LINE__);
+        ret = -1;
+        goto err;
+    }
+
+    /* Clear all validity bits */
+    for(uint32_t i = 0; NULL != config_table && i < table_length; i++)
+    {
+        if(NULL != config_table[i].param_set)
+        {
+            *(config_table[i].param_set) = 0;
+        }
+    }
+
+    LOC_LOGD("%s:%d]: num_params: %d\n", __func__, __LINE__, num_params);
+    while(num_params)
+    {
+        if(!fgets(input_buf, string_len, conf_fp)) {
+            LOC_LOGD("%s:%d]: fgets returned NULL\n", __func__, __LINE__);
+            break;
+        }
+
+        num_params -= loc_fill_conf_item(input_buf, config_table, table_length, string_len);
+    }
+
+err:
+    return ret;
+}
+
+/*===========================================================================
+FUNCTION loc_udpate_conf_long
+
+DESCRIPTION
+   Parses the passed in buffer for configuration items, and update the table
+   that is also passed in.
+
+Reads the specified configuration file and sets defined values based on
+   the passed in configuration table. This table maps strings to values to
+   set along with the type of each of these values.
+
+PARAMETERS:
+   conf_data: configuration items in bufferas a string
+   length: strlen(conf_data)
+   config_table: table definition of strings to places to store information
+   table_length: length of the configuration table
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   number of the records in the table that is updated at time of return.
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+int loc_update_conf_long(const char* conf_data, int32_t length,
+                         const loc_param_s_type* config_table,
+                         uint32_t table_length, uint16_t string_len)
+{
+    int ret = -1;
+
+    if (conf_data && length && config_table && table_length) {
+        // make a copy, so we do not tokenize the original data
+        char* conf_copy = (char*)malloc(length+1);
+
+        if (conf_copy != NULL)
+        {
+            memcpy(conf_copy, conf_data, length);
+            // we hard NULL the end of string to be safe
+            conf_copy[length] = 0;
+
+            // start with one record off
+            uint32_t num_params = table_length - 1;
+            char* saveptr = NULL;
+            char* input_buf = strtok_r(conf_copy, "\n", &saveptr);
+            ret = 0;
+
+            LOC_LOGD("%s:%d]: num_params: %d\n", __func__, __LINE__, num_params);
+            while(num_params && input_buf) {
+                ret++;
+                num_params -=
+                        loc_fill_conf_item(input_buf, config_table, table_length, string_len);
+                input_buf = strtok_r(NULL, "\n", &saveptr);
+            }
+            free(conf_copy);
+        }
+    }
+
+    return ret;
+}
+
+/*===========================================================================
+FUNCTION loc_read_conf_long
+
+DESCRIPTION
+   Reads the specified configuration file and sets defined values based on
+   the passed in configuration table. This table maps strings to values to
+   set along with the type of each of these values.
+
+PARAMETERS:
+   conf_file_name: configuration file to read
+   config_table: table definition of strings to places to store information
+   table_length: length of the configuration table
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   None
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+void loc_read_conf_long(const char* conf_file_name, const loc_param_s_type* config_table,
+                        uint32_t table_length, uint16_t string_len)
+{
+    FILE *conf_fp = NULL;
+
+    log_buffer_init(false);
+    if((conf_fp = fopen(conf_file_name, "r")) != NULL)
+    {
+        LOC_LOGD("%s: using %s", __FUNCTION__, conf_file_name);
+        if(table_length && config_table) {
+            loc_read_conf_r_long(conf_fp, config_table, table_length, string_len);
+            rewind(conf_fp);
+        }
+        loc_read_conf_r_long(conf_fp, loc_param_table, loc_param_num, string_len);
+        fclose(conf_fp);
+    }
+    /* Initialize logging mechanism with parsed data */
+    loc_logger_init(DEBUG_LEVEL, TIMESTAMP);
+    log_buffer_init(sLogBufferEnabled);
+    log_tag_level_map_init();
+}
+
+/*=============================================================================
+ *
+ *   Define and Structures for Parsing Location Process Configuration File
+ *
+ *============================================================================*/
+#define MAX_NUM_STRINGS   20
+
+//We can have 8 masks for now
+#define CONFIG_MASK_TARGET_ALL           0X01
+#define CONFIG_MASK_TARGET_FOUND         0X02
+#define CONFIG_MASK_TARGET_CHECK         0X03
+#define CONFIG_MASK_BASEBAND_ALL         0X04
+#define CONFIG_MASK_BASEBAND_FOUND       0X08
+#define CONFIG_MASK_BASEBAND_CHECK       0x0c
+#define CONFIG_MASK_AUTOPLATFORM_ALL     0x10
+#define CONFIG_MASK_AUTOPLATFORM_FOUND   0x20
+#define CONFIG_MASK_AUTOPLATFORM_CHECK   0x30
+#define CONFIG_MASK_SOCID_ALL            0x40
+#define CONFIG_MASK_SOCID_FOUND          0x80
+#define CONFIG_MASK_SOCID_CHECK          0xc0
+
+#define LOC_FEATURE_MASK_GTP_WIFI_BASIC            0x01
+#define LOC_FEATURE_MASK_GTP_WIFI_PREMIUM          0X02
+#define LOC_FEATURE_MASK_GTP_CELL_BASIC            0X04
+#define LOC_FEATURE_MASK_GTP_CELL_PREMIUM          0X08
+#define LOC_FEATURE_MASK_SAP_BASIC                 0x40
+#define LOC_FEATURE_MASK_SAP_PREMIUM               0X80
+#define LOC_FEATURE_MASK_GTP_WAA_BASIC             0X100
+#define LOC_FEATURE_MASK_GTP_MODEM_CELL_BASIC      0X400
+#define LOC_FEATURE_MASK_ODCPI                     0x1000
+#define LOC_FEATURE_MASK_FREE_WIFI_SCAN_INJECT     0x2000
+#define LOC_FEATURE_MASK_SUPL_WIFI                 0x4000
+#define LOC_FEATURE_MASK_WIFI_SUPPLICANT_INFO      0x8000
+
+typedef struct {
+    char proc_name[LOC_MAX_PARAM_STRING];
+    char proc_argument[LOC_MAX_PARAM_STRING];
+    char proc_status[LOC_MAX_PARAM_STRING];
+    char group_list[LOC_MAX_PARAM_STRING];
+    unsigned int premium_feature;
+    unsigned int loc_feature_mask;
+    char platform_list[LOC_MAX_PARAM_STRING];
+    char baseband[LOC_MAX_PARAM_STRING];
+    char low_ram_targets[LOC_MAX_PARAM_STRING];
+    char soc_id_list[LOC_MAX_PARAM_STRING];
+    unsigned int sglte_target;
+    char feature_gtp_mode[LOC_MAX_PARAM_STRING];
+    char feature_gtp_waa[LOC_MAX_PARAM_STRING];
+    char feature_sap[LOC_MAX_PARAM_STRING];
+    char feature_odcpi[LOC_MAX_PARAM_STRING];
+    char feature_free_wifi_scan_inject[LOC_MAX_PARAM_STRING];
+    char feature_supl_wifi[LOC_MAX_PARAM_STRING];
+    char feature_wifi_supplicant_info[LOC_MAX_PARAM_STRING];
+    char auto_platform[LOC_MAX_PARAM_STRING];
+    unsigned int vendor_enhanced_process;
+} loc_launcher_conf;
+
+/* process configuration parameters */
+static loc_launcher_conf conf;
+
+/* gps.conf Parameter spec table */
+static const loc_param_s_type gps_conf_parameter_table[] = {
+    {"SGLTE_TARGET",        &conf.sglte_target,           NULL, 'n'},
+};
+
+/* location feature conf, e.g.: izat.conf feature mode table*/
+static const loc_param_s_type loc_feature_conf_table[] = {
+    {"GTP_MODE",              &conf.feature_gtp_mode,               NULL, 's'},
+    {"GTP_WAA",               &conf.feature_gtp_waa,                NULL, 's'},
+    {"SAP",                   &conf.feature_sap,                    NULL, 's'},
+    {"ODCPI",                 &conf.feature_odcpi,                  NULL, 's'},
+    {"FREE_WIFI_SCAN_INJECT", &conf.feature_free_wifi_scan_inject,  NULL, 's'},
+    {"SUPL_WIFI",             &conf.feature_supl_wifi,              NULL, 's'},
+    {"WIFI_SUPPLICANT_INFO",  &conf.feature_wifi_supplicant_info,   NULL, 's'},
+};
+
+/* location process conf, e.g.: izat.conf Parameter spec table */
+static const loc_param_s_type loc_process_conf_parameter_table[] = {
+    {"PROCESS_NAME",               &conf.proc_name,                NULL, 's'},
+    {"PROCESS_ARGUMENT",           &conf.proc_argument,            NULL, 's'},
+    {"PROCESS_STATE",              &conf.proc_status,              NULL, 's'},
+    {"PROCESS_GROUPS",             &conf.group_list,               NULL, 's'},
+    {"PREMIUM_FEATURE",            &conf.premium_feature,          NULL, 'n'},
+    {"IZAT_FEATURE_MASK",          &conf.loc_feature_mask,         NULL, 'n'},
+    {"PLATFORMS",                  &conf.platform_list,            NULL, 's'},
+    {"SOC_IDS",                    &conf.soc_id_list,            NULL, 's'},
+    {"BASEBAND",                   &conf.baseband,                 NULL, 's'},
+    {"LOW_RAM_TARGETS",            &conf.low_ram_targets,          NULL, 's'},
+    {"HARDWARE_TYPE",              &conf.auto_platform,            NULL, 's'},
+    {"VENDOR_ENHANCED_PROCESS",    &conf.vendor_enhanced_process,  NULL, 'n'},
+};
+
+/*===========================================================================
+FUNCTION loc_read_process_conf
+
+DESCRIPTION
+   Parse the specified conf file and return info for the processes defined.
+   The format of the file should conform with izat.conf.
+
+PARAMETERS:
+   conf_file_name: configuration file to read
+   process_count_ptr: pointer to store number of processes defined in the conf file.
+   process_info_table_ptr: pointer to store the process info table.
+
+DEPENDENCIES
+   The file must be in izat.conf format.
+
+RETURN VALUE
+   0: success
+   none-zero: failure
+
+SIDE EFFECTS
+   N/A
+
+NOTES:
+   On success, memory pointed by (*process_info_table_ptr) must be freed.
+===========================================================================*/
+int loc_read_process_conf(const char* conf_file_name, uint32_t * process_count_ptr,
+                          loc_process_info_s_type** process_info_table_ptr) {
+    loc_process_info_s_type *child_proc = nullptr;
+    volatile int i=0;
+    unsigned int j=0;
+    gid_t gid_list[LOC_PROCESS_MAX_NUM_GROUPS];
+    char *split_strings[MAX_NUM_STRINGS];
+    int name_length=0, group_list_length=0, platform_length=0, baseband_length=0, ngroups=0, ret=0;
+    int auto_platform_length = 0, soc_id_list_length=0;
+    int group_index=0, nstrings=0, status_length=0;
+    FILE* conf_fp = nullptr;
+    char platform_name[PROPERTY_VALUE_MAX], baseband_name[PROPERTY_VALUE_MAX];
+    int low_ram_target=0;
+    char autoplatform_name[PROPERTY_VALUE_MAX], socid_value[PROPERTY_VALUE_MAX];
+    unsigned int loc_service_mask=0;
+    unsigned char config_mask = 0;
+    unsigned char proc_list_length=0;
+    int gtp_cell_ap_enabled = 0;
+    char arg_gtp_waa[LOC_PROCESS_MAX_ARG_STR_LENGTH] = "--";
+    char arg_gtp_modem_cell[LOC_PROCESS_MAX_ARG_STR_LENGTH] = "--";
+    char arg_gtp_wifi[LOC_PROCESS_MAX_ARG_STR_LENGTH] = "--";
+    char arg_sap[LOC_PROCESS_MAX_ARG_STR_LENGTH] = "--";
+    char arg_disabled[LOC_PROCESS_MAX_ARG_STR_LENGTH] = LOC_FEATURE_MODE_DISABLED;
+    char arg_basic[LOC_PROCESS_MAX_ARG_STR_LENGTH] = LOC_FEATURE_MODE_BASIC;
+    char arg_premium[LOC_PROCESS_MAX_ARG_STR_LENGTH] = LOC_FEATURE_MODE_PREMIUM;
+
+    if (process_count_ptr == NULL || process_info_table_ptr == NULL) {
+        return -1;
+    }
+
+    //Read gps.conf and fill parameter table
+    UTIL_READ_CONF(LOC_PATH_GPS_CONF, gps_conf_parameter_table);
+
+    //Form argument strings
+    strlcat(arg_gtp_waa, LOC_FEATURE_GTP_WAA, LOC_PROCESS_MAX_ARG_STR_LENGTH-3);
+    strlcat(arg_gtp_modem_cell, LOC_FEATURE_GTP_MODEM_CELL, LOC_PROCESS_MAX_ARG_STR_LENGTH-3);
+    strlcat(arg_gtp_wifi, LOC_FEATURE_GTP_WIFI, LOC_PROCESS_MAX_ARG_STR_LENGTH-3);
+    strlcat(arg_sap, LOC_FEATURE_SAP, LOC_PROCESS_MAX_ARG_STR_LENGTH-3);
+
+    //Get platform name from ro.board.platform property
+    loc_get_platform_name(platform_name, sizeof(platform_name));
+    //Get baseband name from ro.baseband property
+    loc_get_target_baseband(baseband_name, sizeof(baseband_name));
+    //Identify if this is an automotive platform
+    loc_get_auto_platform_name(autoplatform_name,sizeof(autoplatform_name));
+    //Identify if this is a low ram target from ro.config.low_ram property
+    low_ram_target = loc_identify_low_ram_target();
+    // Get the soc-id for this device.
+    loc_get_device_soc_id(socid_value, sizeof(socid_value));
+
+    UTIL_READ_CONF(conf_file_name, loc_feature_conf_table);
+
+    //Set service mask for GTP_MODE
+    if (strcmp(conf.feature_gtp_mode, "DISABLED") == 0) {
+        LOC_LOGD("%s:%d]: GTP MODE DISABLED", __func__, __LINE__);
+    }
+    else if (strcmp(conf.feature_gtp_mode, "LEGACY_WWAN") == 0) {
+        LOC_LOGD("%s:%d]: Setting GTP MODE to mode: LEGACY_WWAN", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_GTP_MODEM_CELL_BASIC;
+    }
+    else if (strcmp(conf.feature_gtp_mode, "SDK") == 0) {
+        LOC_LOGD("%s:%d]: Setting GTP MODE to mode: SDK", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_GTP_WIFI_BASIC;
+    }
+    else if (strcmp(conf.feature_gtp_mode, "SDK_WIFI") == 0) {
+        LOC_LOGD("%s:%d]: Setting GTP MODE to mode: SDK", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_GTP_WIFI_BASIC;
+    }
+    //conf file has a garbage value
+    else {
+        LOC_LOGE("%s:%d]: Unrecognized value for GTP MODE Mode."\
+                 " Setting GTP WIFI to default mode: DISABLED", __func__, __LINE__);
+    }
+    //Set service mask for GTP_WAA
+    if (strcmp(conf.feature_gtp_waa, "BASIC") == 0) {
+      LOC_LOGD("%s:%d]: Setting GTP WAA to mode: BASIC", __func__, __LINE__);
+      loc_service_mask |= LOC_FEATURE_MASK_GTP_WAA_BASIC;
+    }
+    else if (strcmp(conf.feature_gtp_waa, "DISABLED") == 0) {
+      LOC_LOGD("%s:%d]: GTP WAA DISABLED", __func__, __LINE__);
+    }
+    //conf file has a garbage value
+    else {
+      LOC_LOGE("%s:%d]: Unrecognized value for GTP WAA Mode."\
+               " Setting GTP WAA to default mode: DISABLED", __func__, __LINE__);
+    }
+
+    //Set service mask for SAP
+    if(strcmp(conf.feature_sap, "PREMIUM") == 0 ||
+       strcmp(conf.feature_sap, "PREMIUM_ENV_AIDING") == 0) {
+        LOC_LOGD("%s:%d]: Setting SAP to mode: PREMIUM", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_SAP_PREMIUM;
+    }
+    else if (strcmp(conf.feature_sap, "BASIC") == 0) {
+        LOC_LOGD("%s:%d]: Setting SAP to mode: BASIC", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_SAP_BASIC;
+    }
+    else if (strcmp(conf.feature_sap, "MODEM_DEFAULT") == 0) {
+        LOC_LOGD("%s:%d]: Setting SAP to mode: MODEM_DEFAULT", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_SAP_BASIC;
+    }
+    else if (strcmp(conf.feature_sap, "DISABLED") == 0) {
+#ifdef USE_GLIB
+        /* Enable slim_daemon even when SAP is set to DISABLED*/
+        loc_service_mask |= LOC_FEATURE_MASK_SAP_BASIC;
+#else
+        LOC_LOGD("%s:%d]: Setting SAP to mode: DISABLED", __func__, __LINE__);
+#endif
+    }
+    else {
+       LOC_LOGE("%s:%d]: Unrecognized value for SAP Mode."\
+                " Setting SAP to default mode: BASIC", __func__, __LINE__);
+       loc_service_mask |= LOC_FEATURE_MASK_SAP_BASIC;
+    }
+
+    // Set service mask for ODCPI
+    if (strcmp(conf.feature_odcpi, "BASIC") == 0) {
+        LOC_LOGD("%s:%d]: Setting ODCPI to mode: BASIC", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_ODCPI;
+    }
+    else if (strcmp(conf.feature_odcpi, "DISABLED") == 0) {
+        LOC_LOGD("%s:%d]: Setting ODCPI to mode: DISABLED", __func__, __LINE__);
+    }
+    else if (strcmp(conf.feature_odcpi, "PREMIUM") == 0) {
+        LOC_LOGD("%s:%d]: Unrecognized value for ODCPI mode."\
+            "Setting ODCPI to default mode: BASIC", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_ODCPI;
+    }
+
+    // Set service mask for FREE_WIFI_SCAN_INJECT
+    if (strcmp(conf.feature_free_wifi_scan_inject, "BASIC") == 0) {
+        LOC_LOGD("%s:%d]: Setting FREE_WIFI_SCAN_INJECT to mode: BASIC", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_FREE_WIFI_SCAN_INJECT;
+    }
+    else if (strcmp(conf.feature_free_wifi_scan_inject, "DISABLED") == 0) {
+        LOC_LOGD("%s:%d]: Setting FREE_WIFI_SCAN_INJECT to mode: DISABLED", __func__, __LINE__);
+    }
+    else if (strcmp(conf.feature_free_wifi_scan_inject, "PREMIUM") == 0) {
+        LOC_LOGD("%s:%d]: Unrecognized value for FREE_WIFI_SCAN_INJECT mode."\
+            "Setting FREE_WIFI_SCAN_INJECT to default mode: BASIC", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_FREE_WIFI_SCAN_INJECT;
+    }
+
+    // Set service mask for SUPL_WIFI
+    if (strcmp(conf.feature_supl_wifi, "BASIC") == 0) {
+        LOC_LOGD("%s:%d]: Setting SUPL_WIFI to mode: BASIC", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_SUPL_WIFI;
+    }
+    else if (strcmp(conf.feature_supl_wifi, "DISABLED") == 0) {
+        LOC_LOGD("%s:%d]: Setting SUPL_WIFI to mode: DISABLED", __func__, __LINE__);
+    }
+    else if (strcmp(conf.feature_supl_wifi, "PREMIUM") == 0) {
+        LOC_LOGD("%s:%d]: Unrecognized value for SUPL_WIFI mode."\
+            "Setting SUPL_WIFI to default mode: BASIC", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_SUPL_WIFI;
+    }
+
+    // Set service mask for WIFI_SUPPLICANT_INFO
+    if (strcmp(conf.feature_wifi_supplicant_info, "BASIC") == 0) {
+        LOC_LOGD("%s:%d]: Setting WIFI_SUPPLICANT_INFO to mode: BASIC", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_WIFI_SUPPLICANT_INFO;
+    }
+    else if (strcmp(conf.feature_wifi_supplicant_info, "DISABLED") == 0) {
+        LOC_LOGD("%s:%d]: Setting WIFI_SUPPLICANT_INFO to mode: DISABLED", __func__, __LINE__);
+    }
+    else if (strcmp(conf.feature_wifi_supplicant_info, "PREMIUM") == 0) {
+        LOC_LOGD("%s:%d]: Unrecognized value for WIFI_SUPPLICANT_INFO mode."\
+            "Setting LOC_FEATURE_MASK_WIFI_SUPPLICANT_INFO to default mode: BASIC", __func__, __LINE__);
+        loc_service_mask |= LOC_FEATURE_MASK_WIFI_SUPPLICANT_INFO;
+    }
+
+    LOC_LOGD("%s:%d]: loc_service_mask: %x\n", __func__, __LINE__, loc_service_mask);
+
+    if((conf_fp = fopen(conf_file_name, "r")) == NULL) {
+        LOC_LOGE("%s:%d]: Error opening %s %s\n", __func__,
+                 __LINE__, conf_file_name, strerror(errno));
+        ret = -1;
+        goto err;
+    }
+
+    //Parse through the file to find out how many processes are to be launched
+    proc_list_length = 0;
+    do {
+        conf.proc_name[0] = 0;
+        //Here note that the 3rd parameter is passed as 1.
+        //This is so that only the first parameter in the table which is "PROCESS_NAME"
+        //is read. We do not want to read the entire block of parameters at this time
+        //since we are only counting the number of processes to launch.
+        //Therefore, only counting the occurrences of PROCESS_NAME parameter
+        //should suffice
+        if(loc_read_conf_r(conf_fp, loc_process_conf_parameter_table, 1)) {
+            LOC_LOGE("%s:%d]: Unable to read conf file. Failing\n", __func__, __LINE__);
+            ret = -1;
+            goto err;
+        }
+        name_length=(int)strlen(conf.proc_name);
+        if(name_length) {
+            proc_list_length++;
+            LOC_LOGD("Process name:%s", conf.proc_name);
+        }
+    } while(name_length);
+    LOC_LOGD("Process cnt = %d", proc_list_length);
+
+    child_proc = (loc_process_info_s_type *)calloc(proc_list_length, sizeof(loc_process_info_s_type));
+    if(child_proc == NULL) {
+        LOC_LOGE("%s:%d]: ERROR: Malloc returned NULL\n", __func__, __LINE__);
+        ret = -1;
+        goto err;
+    }
+
+    //Move file descriptor to the beginning of the file
+    //so that the parameters can be read
+    rewind(conf_fp);
+
+    for(j=0; j<proc_list_length; j++) {
+        //Set defaults for all the child process structs
+        child_proc[j].proc_status = DISABLED;
+        memset(child_proc[j].group_list, 0, sizeof(child_proc[j].group_list));
+        config_mask=0;
+        if(loc_read_conf_r(conf_fp, loc_process_conf_parameter_table,
+                           sizeof(loc_process_conf_parameter_table)/sizeof(loc_process_conf_parameter_table[0]))) {
+            LOC_LOGE("%s:%d]: Unable to read conf file. Failing\n", __func__, __LINE__);
+            ret = -1;
+            goto err;
+        }
+
+        name_length=(int)strlen(conf.proc_name);
+        group_list_length=(int)strlen(conf.group_list);
+        platform_length = (int)strlen(conf.platform_list);
+        baseband_length = (int)strlen(conf.baseband);
+        status_length = (int)strlen(conf.proc_status);
+        auto_platform_length = (int)strlen(conf.auto_platform);
+        soc_id_list_length = (int)strlen(conf.soc_id_list);
+
+        if(!name_length || !group_list_length || !platform_length ||
+           !baseband_length || !status_length || !auto_platform_length || !soc_id_list_length) {
+            LOC_LOGE("%s:%d]: Error: i: %d; One of the parameters not specified in conf file",
+                     __func__, __LINE__, i);
+            continue;
+        }
+
+        if (!isVendorEnhanced() && (conf.vendor_enhanced_process != 0)) {
+            LOC_LOGD("%s:%d]: Process %s is disabled via vendor enhanced process check",
+                     __func__, __LINE__, conf.proc_name);
+            child_proc[j].proc_status = DISABLED_VIA_VENDOR_ENHANCED_CHECK;
+            continue;
+        }
+
+        if (strcmp(conf.proc_status, "DISABLED") == 0) {
+            LOC_LOGD("%s:%d]: Process %s is disabled in conf file",
+                     __func__, __LINE__, conf.proc_name);
+            child_proc[j].proc_status = DISABLED_FROM_CONF;
+            continue;
+        }
+        else if (strcmp(conf.proc_status, "ENABLED") == 0) {
+            LOC_LOGD("%s:%d]: Process %s is enabled in conf file",
+                     __func__, __LINE__, conf.proc_name);
+        }
+
+        //Since strlcpy copies length-1 characters, we add 1 to name_length
+        if((name_length+1) > LOC_MAX_PARAM_STRING) {
+            LOC_LOGE("%s:%d]: i: %d; Length of name parameter too long. Max length: %d",
+                     __func__, __LINE__, i, LOC_MAX_PARAM_STRING);
+            continue;
+        }
+        strlcpy(child_proc[j].name[0], conf.proc_name, sizeof (child_proc[j].name[0]));
+
+        child_proc[j].num_groups = 0;
+        ngroups = loc_util_split_string(conf.group_list, split_strings, MAX_NUM_STRINGS, ' ');
+        for(i=0; i<ngroups; i++) {
+            struct group* grp = getgrnam(split_strings[i]);
+            if (grp) {
+                child_proc[j].group_list[child_proc[j].num_groups] = grp->gr_gid;
+                child_proc[j].num_groups++;
+                LOC_LOGd("Group %s = %d", split_strings[i], grp->gr_gid);
+            }
+        }
+
+        nstrings = loc_util_split_string(conf.platform_list, split_strings, MAX_NUM_STRINGS, ' ');
+        if (strcmp("all", split_strings[0]) == 0) {
+            if (nstrings == 1 || (nstrings == 2 && (strcmp("exclude", split_strings[1]) == 0))) {
+                LOC_LOGD("%s:%d]: Enabled for all targets\n", __func__, __LINE__);
+                config_mask |= CONFIG_MASK_TARGET_ALL;
+            }
+            else if (nstrings > 2 && (strcmp("exclude", split_strings[1]) == 0)) {
+                config_mask |= CONFIG_MASK_TARGET_FOUND;
+                for (i=2; i<nstrings; i++) {
+                    if (strcmp(platform_name, split_strings[i]) == 0) {
+                        LOC_LOGD("%s:%d]: Disabled platform %s\n", __func__, __LINE__, platform_name);
+                        config_mask &= ~CONFIG_MASK_TARGET_FOUND;
+                        break;
+                    }
+                }
+            }
+        }
+        else {
+            for(i=0; i<nstrings; i++) {
+                if (strcmp(platform_name, split_strings[i]) == 0) {
+                    LOC_LOGD("%s:%d]: Matched platform: %s\n",
+                             __func__, __LINE__, split_strings[i]);
+                    config_mask |= CONFIG_MASK_TARGET_FOUND;
+                    break;
+                }
+            }
+        }
+
+        // SOC Id's check
+        nstrings = loc_util_split_string(conf.soc_id_list, split_strings, MAX_NUM_STRINGS, ' ');
+        if (strcmp("all", split_strings[0]) == 0) {
+            if (nstrings == 1 || (nstrings == 2 && (strcmp("exclude", split_strings[1]) == 0))) {
+                LOC_LOGd("Enabled for all SOC ids\n");
+                config_mask |= CONFIG_MASK_SOCID_ALL;
+            }
+            else if (nstrings > 2 && (strcmp("exclude", split_strings[1]) == 0)) {
+                config_mask |= CONFIG_MASK_SOCID_FOUND;
+                for (i = 2; i < nstrings; i++) {
+                    if (strcmp(socid_value, split_strings[i]) == 0) {
+                        LOC_LOGd("Disabled for SOC id %s\n", socid_value);
+                        config_mask &= ~CONFIG_MASK_SOCID_FOUND;
+                        break;
+                    }
+                }
+            }
+        }
+        else {
+            for (i = 0; i < nstrings; i++) {
+                if (strcmp(socid_value, split_strings[i]) == 0) {
+                    LOC_LOGd("Matched SOC id : %s\n", split_strings[i]);
+                    config_mask |= CONFIG_MASK_SOCID_FOUND;
+                    break;
+                }
+            }
+        }
+
+        nstrings = loc_util_split_string(conf.baseband, split_strings, MAX_NUM_STRINGS, ' ');
+        if (strcmp("all", split_strings[0]) == 0) {
+            if (nstrings == 1 || (nstrings == 2 && (strcmp("exclude", split_strings[1]) == 0))) {
+                LOC_LOGD("%s:%d]: Enabled for all basebands\n", __func__, __LINE__);
+                config_mask |= CONFIG_MASK_BASEBAND_ALL;
+            }
+            else if (nstrings > 2 && (strcmp("exclude", split_strings[1]) == 0)) {
+                config_mask |= CONFIG_MASK_BASEBAND_FOUND;
+                for (i=2; i<nstrings; i++) {
+                    if (strcmp(baseband_name, split_strings[i]) == 0) {
+                        LOC_LOGD("%s:%d]: Disabled band %s\n", __func__, __LINE__, baseband_name);
+                        config_mask &= ~CONFIG_MASK_BASEBAND_FOUND;
+                        break;
+                    }
+                }
+            }
+        }
+        else {
+            for(i=0; i<nstrings; i++) {
+                if (strcmp(baseband_name, split_strings[i]) == 0) {
+                    LOC_LOGD("%s:%d]: Matched baseband: %s\n",
+                             __func__, __LINE__, split_strings[i]);
+                    config_mask |= CONFIG_MASK_BASEBAND_FOUND;
+                    break;
+                }
+                //Since ro.baseband is not a reliable source for detecting sglte
+                //the alternative is to read the SGLTE_TARGET parameter from gps.conf
+                //this parameter is read into conf_sglte_target
+                else if((strcmp("sglte", split_strings[i]) == 0 ) && conf.sglte_target) {
+                    LOC_LOGD("%s:%d]: Matched baseband SGLTE\n", __func__, __LINE__);
+                    config_mask |= CONFIG_MASK_BASEBAND_FOUND;
+                    break;
+                }
+            }
+        }
+
+        nstrings = loc_util_split_string(conf.auto_platform, split_strings, MAX_NUM_STRINGS, ' ');
+        if (strcmp("all", split_strings[0]) == 0) {
+            LOC_LOGD("%s:%d]: Enabled for all auto platforms\n", __func__, __LINE__);
+            config_mask |= CONFIG_MASK_AUTOPLATFORM_ALL;
+        }
+        else {
+            for(i=0; i<nstrings; i++) {
+                if (strcmp(autoplatform_name, split_strings[i]) == 0) {
+                    LOC_LOGD("%s:%d]: Matched auto platform: %s\n",
+                             __func__, __LINE__, split_strings[i]);
+                    config_mask |= CONFIG_MASK_AUTOPLATFORM_FOUND;
+                    break;
+                }
+            }
+        }
+
+        nstrings = loc_util_split_string(conf.low_ram_targets, split_strings, MAX_NUM_STRINGS, ' ');
+        if (!strcmp("DISABLED", split_strings[0]) && low_ram_target) {
+            LOC_LOGd("Disabled for low ram targets\n");
+            child_proc[j].proc_status = DISABLED;
+            continue;
+        }
+
+        if((config_mask & CONFIG_MASK_TARGET_CHECK) &&
+           (config_mask & CONFIG_MASK_BASEBAND_CHECK) &&
+           (config_mask & CONFIG_MASK_AUTOPLATFORM_CHECK) &&
+           (config_mask & CONFIG_MASK_SOCID_CHECK) &&
+           (child_proc[j].proc_status != DISABLED_FROM_CONF) &&
+           (child_proc[j].proc_status != DISABLED_VIA_VENDOR_ENHANCED_CHECK)) {
+
+            //Set args
+            //The first argument passed through argv is usually the name of the
+            //binary when started from commandline.
+            //getopt() seems to ignore this first argument and hence we assign it
+            //to the process name for consistency with command line args
+            i = 0;
+            char* temp_arg = ('/' == child_proc[j].name[0][0]) ?
+                (strrchr(child_proc[j].name[0], '/') + 1) : child_proc[j].name[0];
+            strlcpy (child_proc[j].args[i++], temp_arg, sizeof (child_proc[j].args[0]));
+
+            if(conf.premium_feature) {
+               if(conf.loc_feature_mask & loc_service_mask) {
+                    LOC_LOGD("%s:%d]: Enabled. %s has service mask: %x\n",
+                             __func__, __LINE__, child_proc[j].name[0], conf.loc_feature_mask);
+                    child_proc[j].proc_status = ENABLED;
+
+                    if(conf.loc_feature_mask &
+                       (LOC_FEATURE_MASK_GTP_WIFI_BASIC | LOC_FEATURE_MASK_GTP_WIFI_PREMIUM)) {
+                        if(loc_service_mask & LOC_FEATURE_MASK_GTP_WIFI_BASIC) {
+                            strlcpy(child_proc[j].args[i++], arg_gtp_wifi,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                            strlcpy(child_proc[j].args[i++], arg_basic,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                        }
+                        else if(loc_service_mask & LOC_FEATURE_MASK_GTP_WIFI_PREMIUM) {
+                            strlcpy(child_proc[j].args[i++], arg_gtp_wifi,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                            strlcpy(child_proc[j].args[i++], arg_premium,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                        }
+                        else
+                        {
+                            strlcpy(child_proc[j].args[i++], arg_gtp_wifi,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                            strlcpy(child_proc[j].args[i++], arg_disabled,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                        }
+                    }
+                    if(conf.loc_feature_mask &
+                       (LOC_FEATURE_MASK_GTP_CELL_BASIC | LOC_FEATURE_MASK_GTP_CELL_PREMIUM )) {
+                        if(loc_service_mask & LOC_FEATURE_MASK_GTP_MODEM_CELL_BASIC) {
+                            strlcpy(child_proc[j].args[i++], arg_gtp_modem_cell,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                            strlcpy(child_proc[j].args[i++], arg_basic,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                        }
+                        else {
+                             strlcpy(child_proc[j].args[i++], arg_gtp_modem_cell,
+                                     LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                             strlcpy(child_proc[j].args[i++], arg_disabled,
+                                     LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                       }
+                    }
+                    if(conf.loc_feature_mask &
+                       (LOC_FEATURE_MASK_SAP_BASIC | LOC_FEATURE_MASK_SAP_PREMIUM)) {
+                        if(loc_service_mask & LOC_FEATURE_MASK_SAP_BASIC) {
+                            strlcpy(child_proc[j].args[i++], arg_sap,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                            strlcpy(child_proc[j].args[i++], arg_basic,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                        }
+                        else if(loc_service_mask & LOC_FEATURE_MASK_SAP_PREMIUM) {
+                            strlcpy(child_proc[j].args[i++], arg_sap,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                            strlcpy(child_proc[j].args[i++], arg_premium,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                        }
+                        else
+                        {
+                            strlcpy(child_proc[j].args[i++], arg_sap,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                            strlcpy(child_proc[j].args[i++], arg_disabled,
+                                    LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                        }
+                    }
+
+                    if(conf.loc_feature_mask & LOC_FEATURE_MASK_GTP_WAA_BASIC) {
+                      if(loc_service_mask & LOC_FEATURE_MASK_GTP_WAA_BASIC) {
+                        strlcpy(child_proc[j].args[i++], arg_gtp_waa,
+                                LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                        strlcpy(child_proc[j].args[i++], arg_basic,
+                                LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                      }
+                      else
+                      {
+                        strlcpy(child_proc[j].args[i++], arg_gtp_waa,
+                                LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                        strlcpy(child_proc[j].args[i++], arg_disabled,
+                                LOC_PROCESS_MAX_ARG_STR_LENGTH);
+                      }
+                    }
+                    IF_LOC_LOGD {
+                        LOC_LOGD("%s:%d]: %s args\n", __func__, __LINE__, child_proc[j].name[0]);
+                        for(unsigned int k=0; k<LOC_PROCESS_MAX_NUM_ARGS; k++) {
+                            if(child_proc[j].args[k][0] != '\0') {
+                                LOC_LOGD("%s:%d]: k: %d, %s\n", __func__, __LINE__, k,
+                                         child_proc[j].args[k]);
+                            }
+                        }
+                        LOC_LOGD("%s:%d]: \n", __func__, __LINE__);
+                    }
+                }
+                else {
+                    LOC_LOGD("%s:%d]: Disabled. %s has service mask:  %x \n",
+                             __func__, __LINE__, child_proc[j].name[0], conf.loc_feature_mask);
+                }
+            }
+            else {
+                LOC_LOGD("%s:%d]: %s not a premium feature. Enabled\n",
+                         __func__, __LINE__, child_proc[j].name[0]);
+                child_proc[j].proc_status = ENABLED;
+            }
+
+            /*Fill up the remaining arguments from configuration file*/
+            LOC_LOGD("%s] Parsing Process_Arguments from Configuration: %s \n",
+                      __func__, conf.proc_argument);
+            if(0 != conf.proc_argument[0])
+            {
+                /**************************************
+                ** conf_proc_argument is shared by all the programs getting launched,
+                ** hence copy to process specific argument string and parse the same.
+                ***************************************/
+                strlcpy(child_proc[j].argumentString, conf.proc_argument,
+                        sizeof(child_proc[j].argumentString));
+                char *temp_args[LOC_PROCESS_MAX_NUM_ARGS];
+                memset (temp_args, 0, sizeof (temp_args));
+                loc_util_split_string(child_proc[j].argumentString, &temp_args[i],
+                                      (LOC_PROCESS_MAX_NUM_ARGS - i), ' ');
+                // copy argument from the pointer to the memory
+                for (unsigned int index = i; index < LOC_PROCESS_MAX_NUM_ARGS; index++) {
+                    if (temp_args[index] == NULL) {
+                        break;
+                    }
+                    strlcpy (child_proc[j].args[index], temp_args[index],
+                             sizeof (child_proc[j].args[index]));
+                }
+            }
+        }
+        else {
+            LOC_LOGD("%s:%d]: Process %s is disabled\n",
+                     __func__, __LINE__, child_proc[j].name[0]);
+        }
+    }
+
+err:
+    if (conf_fp) {
+        fclose(conf_fp);
+    }
+    if (ret != 0) {
+        LOC_LOGE("%s:%d]: ret: %d", __func__, __LINE__, ret);
+        if (child_proc) {
+            free (child_proc);
+            child_proc = nullptr;
+        }
+        *process_count_ptr = 0;
+        *process_info_table_ptr = nullptr;
+
+    }
+    else {
+        *process_count_ptr = proc_list_length;
+        *process_info_table_ptr = child_proc;
+    }
+
+    return ret;
+}
diff --git a/gps/utils/loc_cfg.h b/gps/utils/loc_cfg.h
new file mode 100644
index 0000000..e87d632
--- /dev/null
+++ b/gps/utils/loc_cfg.h
@@ -0,0 +1,167 @@
+/* Copyright (c) 2011-2015, 2018, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef LOC_CFG_H
+#define LOC_CFG_H
+
+#include <stdio.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <grp.h>
+
+#define LOC_MAX_PARAM_NAME                 80
+#define LOC_MAX_PARAM_STRING               172
+#define LOC_MAX_PARAM_LINE    (LOC_MAX_PARAM_NAME + LOC_MAX_PARAM_STRING)
+
+#define LOC_FEATURE_MODE_DISABLED "DISABLED"
+#define LOC_FEATURE_MODE_BASIC    "BASIC"
+#define LOC_FEATURE_MODE_PREMIUM  "PREMIUM"
+
+#define LOC_FEATURE_GTP_AP_CELL        "gtp-ap-cell"
+#define LOC_FEATURE_GTP_MODEM_CELL     "gtp-modem-cell"
+#define LOC_FEATURE_GTP_CELL_ENH       "gtp-cell-enh"
+#define LOC_FEATURE_GTP_WIFI           "gtp-wifi"
+#define LOC_FEATURE_GTP_WAA            "gtp-waa"
+#define LOC_FEATURE_SAP                "sap"
+
+#define LOC_PROCESS_MAX_NUM_GROUPS     20
+#define LOC_PROCESS_MAX_NUM_ARGS       25
+#define LOC_PROCESS_MAX_ARG_STR_LENGTH 32
+
+#define UTIL_UPDATE_CONF(conf_data, len, config_table) \
+    loc_update_conf((conf_data), (len), (&config_table[0]), \
+                    sizeof(config_table) / sizeof(config_table[0]))
+
+#define UTIL_READ_CONF_DEFAULT(filename) \
+    loc_read_conf((filename), NULL, 0);
+
+#define UTIL_READ_CONF(filename, config_table) \
+    loc_read_conf((filename), (&config_table[0]), sizeof(config_table) / sizeof(config_table[0]))
+
+#define UTIL_READ_CONF_LONG(filename, config_table, rec_len) \
+    loc_read_conf_long((filename), (&config_table[0]), \
+            sizeof(config_table) / sizeof(config_table[0]), (rec_len))
+
+/*=============================================================================
+ *
+ *                        MODULE TYPE DECLARATION
+ *
+ *============================================================================*/
+typedef struct
+{
+  const char *param_name;
+  void       *param_ptr;   /* for string type, buf size need to be LOC_MAX_PARAM_STRING */
+  uint8_t    *param_set;   /* indicate value set by config file */
+  char        param_type;  /* 'n' for number,
+                              's' for string, NOTE: buf size need to be LOC_MAX_PARAM_STRING
+                              'f' for double */
+} loc_param_s_type;
+
+typedef enum {
+    ENABLED,
+    RUNNING,
+    DISABLED,
+    DISABLED_FROM_CONF,
+    DISABLED_VIA_VENDOR_ENHANCED_CHECK
+} loc_process_e_status;
+
+typedef struct {
+    loc_process_e_status proc_status;
+    pid_t                proc_id;
+    char                 name[2][LOC_MAX_PARAM_STRING];
+    gid_t                group_list[LOC_PROCESS_MAX_NUM_GROUPS];
+    unsigned char        num_groups;
+    char                 args[LOC_PROCESS_MAX_NUM_ARGS][LOC_PROCESS_MAX_ARG_STR_LENGTH];
+    char                 argumentString[LOC_MAX_PARAM_STRING];
+} loc_process_info_s_type;
+
+/*=============================================================================
+ *
+ *                          MODULE EXTERNAL DATA
+ *
+ *============================================================================*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*=============================================================================
+ *
+ *                       MODULE EXPORTED FUNCTIONS
+ *
+ *============================================================================*/
+bool isVendorEnhanced();
+void setVendorEnhanced(bool vendorEnhanced);
+void loc_read_conf_long(const char* conf_file_name,
+                        const loc_param_s_type* config_table,
+                        uint32_t table_length, uint16_t string_len);
+int loc_read_conf_r_long(FILE *conf_fp, const loc_param_s_type* config_table,
+                         uint32_t table_length, uint16_t string_len);
+int loc_update_conf_long(const char* conf_data, int32_t length,
+                         const loc_param_s_type* config_table, uint32_t table_length,
+                         uint16_t string_len);
+
+inline void loc_read_conf(const char* conf_file_name,
+                          const loc_param_s_type* config_table, uint32_t table_length) {
+    loc_read_conf_long(conf_file_name, config_table, table_length, LOC_MAX_PARAM_STRING);
+}
+
+inline int loc_read_conf_r(FILE *conf_fp, const loc_param_s_type* config_table,
+                    uint32_t table_length) {
+    return (loc_read_conf_r_long(conf_fp, config_table, table_length, LOC_MAX_PARAM_STRING));
+}
+
+inline int loc_update_conf(const char* conf_data, int32_t length,
+                    const loc_param_s_type* config_table, uint32_t table_length) {
+    return (loc_update_conf_long(
+                    conf_data, length, config_table, table_length, LOC_MAX_PARAM_STRING));
+}
+
+// Below are the location conf file paths
+extern const char LOC_PATH_GPS_CONF[];
+extern const char LOC_PATH_IZAT_CONF[];
+extern const char LOC_PATH_FLP_CONF[];
+extern const char LOC_PATH_LOWI_CONF[];
+extern const char LOC_PATH_SAP_CONF[];
+extern const char LOC_PATH_APDR_CONF[];
+extern const char LOC_PATH_XTWIFI_CONF[];
+extern const char LOC_PATH_QUIPC_CONF[];
+extern const char LOC_PATH_ANT_CORR[];
+extern const char LOC_PATH_SLIM_CONF[];
+extern const char LOC_PATH_VPE_CONF[];
+
+int loc_read_process_conf(const char* conf_file_name, uint32_t * process_count_ptr,
+                          loc_process_info_s_type** process_info_table_ptr);
+int loc_get_datum_type();
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LOC_CFG_H */
diff --git a/gps/utils/loc_gps.h b/gps/utils/loc_gps.h
new file mode 100644
index 0000000..90541c4
--- /dev/null
+++ b/gps/utils/loc_gps.h
@@ -0,0 +1,2235 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LOC_GPS_H
+#define LOC_GPS_H
+
+#include <stdint.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <pthread.h>
+#include <sys/socket.h>
+#include <stdbool.h>
+
+__BEGIN_DECLS
+
+#define LOC_FLP_STATUS_LOCATION_AVAILABLE         0
+#define LOC_FLP_STATUS_LOCATION_UNAVAILABLE       1
+#define LOC_CAPABILITY_GNSS         (1U<<0)
+#define LOC_CAPABILITY_WIFI         (1U<<1)
+#define LOC_CAPABILITY_CELL         (1U<<3)
+
+/** Milliseconds since January 1, 1970 */
+typedef int64_t LocGpsUtcTime;
+
+/** Maximum number of SVs for loc_gps_sv_status_callback(). */
+#define LOC_GPS_MAX_SVS 32
+/** Maximum number of SVs for loc_gps_sv_status_callback(). */
+#define LOC_GNSS_MAX_SVS 64
+
+/** Maximum number of Measurements in loc_gps_measurement_callback(). */
+#define LOC_GPS_MAX_MEASUREMENT   32
+
+/** Maximum number of Measurements in loc_gnss_measurement_callback(). */
+#define LOC_GNSS_MAX_MEASUREMENT   64
+
+/** Requested operational mode for GPS operation. */
+typedef uint32_t LocGpsPositionMode;
+/* IMPORTANT: Note that the following values must match
+ * constants in GpsLocationProvider.java. */
+/** Mode for running GPS standalone (no assistance). */
+#define LOC_GPS_POSITION_MODE_STANDALONE    0
+/** AGPS MS-Based mode. */
+#define LOC_GPS_POSITION_MODE_MS_BASED      1
+/**
+ * AGPS MS-Assisted mode. This mode is not maintained by the platform anymore.
+ * It is strongly recommended to use LOC_GPS_POSITION_MODE_MS_BASED instead.
+ */
+#define LOC_GPS_POSITION_MODE_MS_ASSISTED   2
+
+/** Requested recurrence mode for GPS operation. */
+typedef uint32_t LocGpsPositionRecurrence;
+/* IMPORTANT: Note that the following values must match
+ * constants in GpsLocationProvider.java. */
+/** Receive GPS fixes on a recurring basis at a specified period. */
+#define LOC_GPS_POSITION_RECURRENCE_PERIODIC    0
+/** Request a single shot GPS fix. */
+#define LOC_GPS_POSITION_RECURRENCE_SINGLE      1
+
+/** GPS status event values. */
+typedef uint16_t LocGpsStatusValue;
+/* IMPORTANT: Note that the following values must match
+ * constants in GpsLocationProvider.java. */
+/** GPS status unknown. */
+#define LOC_GPS_STATUS_NONE             0
+/** GPS has begun navigating. */
+#define LOC_GPS_STATUS_SESSION_BEGIN    1
+/** GPS has stopped navigating. */
+#define LOC_GPS_STATUS_SESSION_END      2
+/** GPS has powered on but is not navigating. */
+#define LOC_GPS_STATUS_ENGINE_ON        3
+/** GPS is powered off. */
+#define LOC_GPS_STATUS_ENGINE_OFF       4
+
+/** Flags to indicate which values are valid in a LocGpsLocation. */
+typedef uint16_t LocGpsLocationFlags;
+/* IMPORTANT: Note that the following values must match
+ * constants in GpsLocationProvider.java. */
+/** LocGpsLocation has valid latitude and longitude. */
+#define LOC_GPS_LOCATION_HAS_LAT_LONG   0x0001
+/** LocGpsLocation has valid altitude. */
+#define LOC_GPS_LOCATION_HAS_ALTITUDE   0x0002
+/** LocGpsLocation has valid speed. */
+#define LOC_GPS_LOCATION_HAS_SPEED      0x0004
+/** LocGpsLocation has valid bearing. */
+#define LOC_GPS_LOCATION_HAS_BEARING    0x0008
+/** LocGpsLocation has valid accuracy. */
+#define LOC_GPS_LOCATION_HAS_ACCURACY   0x0010
+/** LocGpsLocation has valid vertical uncertainity */
+#define LOC_GPS_LOCATION_HAS_VERT_UNCERTAINITY   0x0040
+/** LocGpsLocation has valid spoof mask */
+#define LOC_GPS_LOCATION_HAS_SPOOF_MASK   0x0080
+/** LocGpsLocation has valid speed accuracy */
+#define LOC_GPS_LOCATION_HAS_SPEED_ACCURACY   0x0100
+/** LocGpsLocation has valid bearing accuracy */
+#define LOC_GPS_LOCATION_HAS_BEARING_ACCURACY 0x0200
+/** LocGpsLocation has valid Real Time and Real Time Uncertainty */
+#define LOC_GPS_LOCATION_HAS_ELAPSED_REAL_TIME 0x0400
+
+/** Spoof mask in LocGpsLocation */
+typedef uint32_t LocGpsSpoofMask;
+#define LOC_GPS_LOCATION_NONE_SPOOFED            0x0000
+#define LOC_GPS_LOCATION_POSITION_SPOOFED        0x0001
+#define LOC_GPS_LOCATION_TIME_SPOOFED            0x0002
+#define LOC_GPS_LOCATION_NAVIGATION_DATA_SPOOFED 0x0004
+
+/** Flags for the loc_gps_set_capabilities callback. */
+
+/**
+ * GPS HAL schedules fixes for LOC_GPS_POSITION_RECURRENCE_PERIODIC mode. If this is
+ * not set, then the framework will use 1000ms for min_interval and will start
+ * and call start() and stop() to schedule the GPS.
+ */
+#define LOC_GPS_CAPABILITY_SCHEDULING       (1 << 0)
+/** GPS supports MS-Based AGPS mode */
+#define LOC_GPS_CAPABILITY_MSB              (1 << 1)
+/** GPS supports MS-Assisted AGPS mode */
+#define LOC_GPS_CAPABILITY_MSA              (1 << 2)
+/** GPS supports single-shot fixes */
+#define LOC_GPS_CAPABILITY_SINGLE_SHOT      (1 << 3)
+/** GPS supports on demand time injection */
+#define LOC_GPS_CAPABILITY_ON_DEMAND_TIME   (1 << 4)
+/** GPS supports Geofencing  */
+#define LOC_GPS_CAPABILITY_GEOFENCING       (1 << 5)
+/** GPS supports Measurements. */
+#define LOC_GPS_CAPABILITY_MEASUREMENTS     (1 << 6)
+/** GPS supports Navigation Messages */
+#define LOC_GPS_CAPABILITY_NAV_MESSAGES     (1 << 7)
+
+/**
+ * Flags used to specify which aiding data to delete when calling
+ * delete_aiding_data().
+ */
+typedef uint16_t LocGpsAidingData;
+/* IMPORTANT: Note that the following values must match
+ * constants in GpsLocationProvider.java. */
+#define LOC_GPS_DELETE_EPHEMERIS        0x0001
+#define LOC_GPS_DELETE_ALMANAC          0x0002
+#define LOC_GPS_DELETE_POSITION         0x0004
+#define LOC_GPS_DELETE_TIME             0x0008
+#define LOC_GPS_DELETE_IONO             0x0010
+#define LOC_GPS_DELETE_UTC              0x0020
+#define LOC_GPS_DELETE_HEALTH           0x0040
+#define LOC_GPS_DELETE_SVDIR            0x0080
+#define LOC_GPS_DELETE_SVSTEER          0x0100
+#define LOC_GPS_DELETE_SADATA           0x0200
+#define LOC_GPS_DELETE_RTI              0x0400
+#define LOC_GPS_DELETE_MB_DATA          0x0800
+#define LOC_GPS_DELETE_CELLDB_INFO      0x8000
+#define LOC_GPS_DELETE_ALL              0xFFFF
+
+/** AGPS type */
+typedef uint16_t LocAGpsType;
+#define LOC_AGPS_TYPE_ANY           0
+#define LOC_AGPS_TYPE_SUPL          1
+#define LOC_AGPS_TYPE_C2K           2
+#define LOC_AGPS_TYPE_WWAN_ANY      3
+#define LOC_AGPS_TYPE_WIFI          4
+#define LOC_AGPS_TYPE_SUPL_ES       5
+
+typedef uint16_t LocAGpsSetIDType;
+#define LOC_AGPS_SETID_TYPE_NONE    0
+#define LOC_AGPS_SETID_TYPE_IMSI    1
+#define LOC_AGPS_SETID_TYPE_MSISDN  2
+
+typedef uint16_t LocApnIpType;
+#define LOC_APN_IP_INVALID          0
+#define LOC_APN_IP_IPV4             1
+#define LOC_APN_IP_IPV6             2
+#define LOC_APN_IP_IPV4V6           3
+
+/**
+ * String length constants
+ */
+#define LOC_GPS_NI_SHORT_STRING_MAXLEN      256
+#define LOC_GPS_NI_LONG_STRING_MAXLEN       2048
+
+/**
+ * LocGpsNiType constants
+ */
+typedef uint32_t LocGpsNiType;
+#define LOC_GPS_NI_TYPE_VOICE              1
+#define LOC_GPS_NI_TYPE_UMTS_SUPL          2
+#define LOC_GPS_NI_TYPE_UMTS_CTRL_PLANE    3
+/*Emergency SUPL*/
+#define LOC_GPS_NI_TYPE_EMERGENCY_SUPL     4
+
+/**
+ * LocGpsNiNotifyFlags constants
+ */
+typedef uint32_t LocGpsNiNotifyFlags;
+/** NI requires notification */
+#define LOC_GPS_NI_NEED_NOTIFY          0x0001
+/** NI requires verification */
+#define LOC_GPS_NI_NEED_VERIFY          0x0002
+/** NI requires privacy override, no notification/minimal trace */
+#define LOC_GPS_NI_PRIVACY_OVERRIDE     0x0004
+
+/**
+ * GPS NI responses, used to define the response in
+ * NI structures
+ */
+typedef int LocGpsUserResponseType;
+#define LOC_GPS_NI_RESPONSE_ACCEPT         1
+#define LOC_GPS_NI_RESPONSE_DENY           2
+#define LOC_GPS_NI_RESPONSE_NORESP         3
+
+/**
+ * NI data encoding scheme
+ */
+typedef int LocGpsNiEncodingType;
+#define LOC_GPS_ENC_NONE                   0
+#define LOC_GPS_ENC_SUPL_GSM_DEFAULT       1
+#define LOC_GPS_ENC_SUPL_UTF8              2
+#define LOC_GPS_ENC_SUPL_UCS2              3
+#define LOC_GPS_ENC_UNKNOWN                -1
+
+/** AGPS status event values. */
+typedef uint8_t LocAGpsStatusValue;
+/** GPS requests data connection for AGPS. */
+#define LOC_GPS_REQUEST_AGPS_DATA_CONN  1
+/** GPS releases the AGPS data connection. */
+#define LOC_GPS_RELEASE_AGPS_DATA_CONN  2
+/** AGPS data connection initiated */
+#define LOC_GPS_AGPS_DATA_CONNECTED     3
+/** AGPS data connection completed */
+#define LOC_GPS_AGPS_DATA_CONN_DONE     4
+/** AGPS data connection failed */
+#define LOC_GPS_AGPS_DATA_CONN_FAILED   5
+
+typedef uint16_t LocAGpsRefLocationType;
+#define LOC_AGPS_REF_LOCATION_TYPE_GSM_CELLID   1
+#define LOC_AGPS_REF_LOCATION_TYPE_UMTS_CELLID  2
+#define LOC_AGPS_REF_LOCATION_TYPE_MAC          3
+#define LOC_AGPS_REF_LOCATION_TYPE_LTE_CELLID   4
+
+/* Deprecated, to be removed in the next Android release. */
+#define LOC_AGPS_REG_LOCATION_TYPE_MAC          3
+
+/** Network types for update_network_state "type" parameter */
+#define LOC_AGPS_RIL_NETWORK_TYPE_MOBILE        0
+#define LOC_AGPS_RIL_NETWORK_TYPE_WIFI          1
+#define LOC_AGPS_RIL_NETWORK_TYPE_MOBILE_MMS    2
+#define LOC_AGPS_RIL_NETWORK_TYPE_MOBILE_SUPL   3
+#define LOC_AGPS_RIL_NETWORK_TTYPE_MOBILE_DUN   4
+#define LOC_AGPS_RIL_NETWORK_TTYPE_MOBILE_HIPRI 5
+#define LOC_AGPS_RIL_NETWORK_TTYPE_WIMAX        6
+
+/* The following typedef together with its constants below are deprecated, and
+ * will be removed in the next release. */
+typedef uint16_t LocGpsClockFlags;
+#define LOC_GPS_CLOCK_HAS_LEAP_SECOND               (1<<0)
+#define LOC_GPS_CLOCK_HAS_TIME_UNCERTAINTY          (1<<1)
+#define LOC_GPS_CLOCK_HAS_FULL_BIAS                 (1<<2)
+#define LOC_GPS_CLOCK_HAS_BIAS                      (1<<3)
+#define LOC_GPS_CLOCK_HAS_BIAS_UNCERTAINTY          (1<<4)
+#define LOC_GPS_CLOCK_HAS_DRIFT                     (1<<5)
+#define LOC_GPS_CLOCK_HAS_DRIFT_UNCERTAINTY         (1<<6)
+
+/**
+ * Flags to indicate what fields in LocGnssClock are valid.
+ */
+typedef uint16_t LocGnssClockFlags;
+/** A valid 'leap second' is stored in the data structure. */
+#define LOC_GNSS_CLOCK_HAS_LEAP_SECOND               (1<<0)
+/** A valid 'time uncertainty' is stored in the data structure. */
+#define LOC_GNSS_CLOCK_HAS_TIME_UNCERTAINTY          (1<<1)
+/** A valid 'full bias' is stored in the data structure. */
+#define LOC_GNSS_CLOCK_HAS_FULL_BIAS                 (1<<2)
+/** A valid 'bias' is stored in the data structure. */
+#define LOC_GNSS_CLOCK_HAS_BIAS                      (1<<3)
+/** A valid 'bias uncertainty' is stored in the data structure. */
+#define LOC_GNSS_CLOCK_HAS_BIAS_UNCERTAINTY          (1<<4)
+/** A valid 'drift' is stored in the data structure. */
+#define LOC_GNSS_CLOCK_HAS_DRIFT                     (1<<5)
+/** A valid 'drift uncertainty' is stored in the data structure. */
+#define LOC_GNSS_CLOCK_HAS_DRIFT_UNCERTAINTY         (1<<6)
+
+/* The following typedef together with its constants below are deprecated, and
+ * will be removed in the next release. */
+typedef uint8_t LocGpsClockType;
+#define LOC_GPS_CLOCK_TYPE_UNKNOWN                  0
+#define LOC_GPS_CLOCK_TYPE_LOCAL_HW_TIME            1
+#define LOC_GPS_CLOCK_TYPE_GPS_TIME                 2
+
+/* The following typedef together with its constants below are deprecated, and
+ * will be removed in the next release. */
+typedef uint32_t LocGpsMeasurementFlags;
+#define LOC_GPS_MEASUREMENT_HAS_SNR                               (1<<0)
+#define LOC_GPS_MEASUREMENT_HAS_ELEVATION                         (1<<1)
+#define LOC_GPS_MEASUREMENT_HAS_ELEVATION_UNCERTAINTY             (1<<2)
+#define LOC_GPS_MEASUREMENT_HAS_AZIMUTH                           (1<<3)
+#define LOC_GPS_MEASUREMENT_HAS_AZIMUTH_UNCERTAINTY               (1<<4)
+#define LOC_GPS_MEASUREMENT_HAS_PSEUDORANGE                       (1<<5)
+#define LOC_GPS_MEASUREMENT_HAS_PSEUDORANGE_UNCERTAINTY           (1<<6)
+#define LOC_GPS_MEASUREMENT_HAS_CODE_PHASE                        (1<<7)
+#define LOC_GPS_MEASUREMENT_HAS_CODE_PHASE_UNCERTAINTY            (1<<8)
+#define LOC_GPS_MEASUREMENT_HAS_CARRIER_FREQUENCY                 (1<<9)
+#define LOC_GPS_MEASUREMENT_HAS_CARRIER_CYCLES                    (1<<10)
+#define LOC_GPS_MEASUREMENT_HAS_CARRIER_PHASE                     (1<<11)
+#define LOC_GPS_MEASUREMENT_HAS_CARRIER_PHASE_UNCERTAINTY         (1<<12)
+#define LOC_GPS_MEASUREMENT_HAS_BIT_NUMBER                        (1<<13)
+#define LOC_GPS_MEASUREMENT_HAS_TIME_FROM_LAST_BIT                (1<<14)
+#define LOC_GPS_MEASUREMENT_HAS_DOPPLER_SHIFT                     (1<<15)
+#define LOC_GPS_MEASUREMENT_HAS_DOPPLER_SHIFT_UNCERTAINTY         (1<<16)
+#define LOC_GPS_MEASUREMENT_HAS_USED_IN_FIX                       (1<<17)
+#define LOC_GPS_MEASUREMENT_HAS_UNCORRECTED_PSEUDORANGE_RATE      (1<<18)
+
+/**
+ * Flags to indicate what fields in LocGnssMeasurement are valid.
+ */
+typedef uint32_t LocGnssMeasurementFlags;
+/** A valid 'snr' is stored in the data structure. */
+#define LOC_GNSS_MEASUREMENT_HAS_SNR                               (1<<0)
+/** A valid 'carrier frequency' is stored in the data structure. */
+#define LOC_GNSS_MEASUREMENT_HAS_CARRIER_FREQUENCY                 (1<<9)
+/** A valid 'carrier cycles' is stored in the data structure. */
+#define LOC_GNSS_MEASUREMENT_HAS_CARRIER_CYCLES                    (1<<10)
+/** A valid 'carrier phase' is stored in the data structure. */
+#define LOC_GNSS_MEASUREMENT_HAS_CARRIER_PHASE                     (1<<11)
+/** A valid 'carrier phase uncertainty' is stored in the data structure. */
+#define LOC_GNSS_MEASUREMENT_HAS_CARRIER_PHASE_UNCERTAINTY         (1<<12)
+
+/* The following typedef together with its constants below are deprecated, and
+ * will be removed in the next release. */
+typedef uint8_t LocGpsLossOfLock;
+#define LOC_GPS_LOSS_OF_LOCK_UNKNOWN                            0
+#define LOC_GPS_LOSS_OF_LOCK_OK                                 1
+#define LOC_GPS_LOSS_OF_LOCK_CYCLE_SLIP                         2
+
+/* The following typedef together with its constants below are deprecated, and
+ * will be removed in the next release. Use LocGnssMultipathIndicator instead.
+ */
+typedef uint8_t LocGpsMultipathIndicator;
+#define LOC_GPS_MULTIPATH_INDICATOR_UNKNOWN                 0
+#define LOC_GPS_MULTIPATH_INDICATOR_DETECTED                1
+#define LOC_GPS_MULTIPATH_INDICATOR_NOT_USED                2
+
+/**
+ * Enumeration of available values for the GNSS Measurement's multipath
+ * indicator.
+ */
+typedef uint8_t LocGnssMultipathIndicator;
+/** The indicator is not available or unknown. */
+#define LOC_GNSS_MULTIPATH_INDICATOR_UNKNOWN                 0
+/** The measurement is indicated to be affected by multipath. */
+#define LOC_GNSS_MULTIPATH_INDICATOR_PRESENT                 1
+/** The measurement is indicated to be not affected by multipath. */
+#define LOC_GNSS_MULTIPATH_INDICATOR_NOT_PRESENT             2
+
+/* The following typedef together with its constants below are deprecated, and
+ * will be removed in the next release. */
+typedef uint16_t LocGpsMeasurementState;
+#define LOC_GPS_MEASUREMENT_STATE_UNKNOWN                   0
+#define LOC_GPS_MEASUREMENT_STATE_CODE_LOCK             (1<<0)
+#define LOC_GPS_MEASUREMENT_STATE_BIT_SYNC              (1<<1)
+#define LOC_GPS_MEASUREMENT_STATE_SUBFRAME_SYNC         (1<<2)
+#define LOC_GPS_MEASUREMENT_STATE_TOW_DECODED           (1<<3)
+#define LOC_GPS_MEASUREMENT_STATE_MSEC_AMBIGUOUS        (1<<4)
+
+/**
+ * Flags indicating the GNSS measurement state.
+ *
+ * The expected behavior here is for GPS HAL to set all the flags that applies.
+ * For example, if the state for a satellite is only C/A code locked and bit
+ * synchronized, and there is still millisecond ambiguity, the state should be
+ * set as:
+ *
+ * LOC_GNSS_MEASUREMENT_STATE_CODE_LOCK | LOC_GNSS_MEASUREMENT_STATE_BIT_SYNC |
+ *         LOC_GNSS_MEASUREMENT_STATE_MSEC_AMBIGUOUS
+ *
+ * If GNSS is still searching for a satellite, the corresponding state should be
+ * set to LOC_GNSS_MEASUREMENT_STATE_UNKNOWN(0).
+ */
+typedef uint32_t LocGnssMeasurementState;
+#define LOC_GNSS_MEASUREMENT_STATE_UNKNOWN                   0
+#define LOC_GNSS_MEASUREMENT_STATE_CODE_LOCK             (1<<0)
+#define LOC_GNSS_MEASUREMENT_STATE_BIT_SYNC              (1<<1)
+#define LOC_GNSS_MEASUREMENT_STATE_SUBFRAME_SYNC         (1<<2)
+#define LOC_GNSS_MEASUREMENT_STATE_TOW_DECODED           (1<<3)
+#define LOC_GNSS_MEASUREMENT_STATE_MSEC_AMBIGUOUS        (1<<4)
+#define LOC_GNSS_MEASUREMENT_STATE_SYMBOL_SYNC           (1<<5)
+#define LOC_GNSS_MEASUREMENT_STATE_GLO_STRING_SYNC       (1<<6)
+#define LOC_GNSS_MEASUREMENT_STATE_GLO_TOD_DECODED       (1<<7)
+#define LOC_GNSS_MEASUREMENT_STATE_BDS_D2_BIT_SYNC       (1<<8)
+#define LOC_GNSS_MEASUREMENT_STATE_BDS_D2_SUBFRAME_SYNC  (1<<9)
+#define LOC_GNSS_MEASUREMENT_STATE_GAL_E1BC_CODE_LOCK    (1<<10)
+#define LOC_GNSS_MEASUREMENT_STATE_GAL_E1C_2ND_CODE_LOCK (1<<11)
+#define LOC_GNSS_MEASUREMENT_STATE_GAL_E1B_PAGE_SYNC     (1<<12)
+#define LOC_GNSS_MEASUREMENT_STATE_SBAS_SYNC             (1<<13)
+
+/* The following typedef together with its constants below are deprecated, and
+ * will be removed in the next release. */
+typedef uint16_t LocGpsAccumulatedDeltaRangeState;
+#define LOC_GPS_ADR_STATE_UNKNOWN                       0
+#define LOC_GPS_ADR_STATE_VALID                     (1<<0)
+#define LOC_GPS_ADR_STATE_RESET                     (1<<1)
+#define LOC_GPS_ADR_STATE_CYCLE_SLIP                (1<<2)
+
+/**
+ * Flags indicating the Accumulated Delta Range's states.
+ */
+typedef uint16_t LocGnssAccumulatedDeltaRangeState;
+#define LOC_GNSS_ADR_STATE_UNKNOWN                       0
+#define LOC_GNSS_ADR_STATE_VALID                     (1<<0)
+#define LOC_GNSS_ADR_STATE_RESET                     (1<<1)
+#define LOC_GNSS_ADR_STATE_CYCLE_SLIP                (1<<2)
+
+#if 0
+/* The following typedef together with its constants below are deprecated, and
+ * will be removed in the next release. */
+typedef uint8_t GpsNavigationMessageType;
+#define GPS_NAVIGATION_MESSAGE_TYPE_UNKNOWN         0
+#define GPS_NAVIGATION_MESSAGE_TYPE_L1CA            1
+#define GPS_NAVIGATION_MESSAGE_TYPE_L2CNAV          2
+#define GPS_NAVIGATION_MESSAGE_TYPE_L5CNAV          3
+#define GPS_NAVIGATION_MESSAGE_TYPE_CNAV2           4
+
+/**
+ * Enumeration of available values to indicate the GNSS Navigation message
+ * types.
+ *
+ * For convenience, first byte is the LocGnssConstellationType on which that signal
+ * is typically transmitted
+ */
+typedef int16_t GnssNavigationMessageType;
+
+#define GNSS_NAVIGATION_MESSAGE_TYPE_UNKNOWN       0
+/** GPS L1 C/A message contained in the structure.  */
+#define GNSS_NAVIGATION_MESSAGE_TYPE_GPS_L1CA      0x0101
+/** GPS L2-CNAV message contained in the structure. */
+#define GNSS_NAVIGATION_MESSAGE_TYPE_GPS_L2CNAV    0x0102
+/** GPS L5-CNAV message contained in the structure. */
+#define GNSS_NAVIGATION_MESSAGE_TYPE_GPS_L5CNAV    0x0103
+/** GPS CNAV-2 message contained in the structure. */
+#define GNSS_NAVIGATION_MESSAGE_TYPE_GPS_CNAV2     0x0104
+/** Glonass L1 CA message contained in the structure. */
+#define GNSS_NAVIGATION_MESSAGE_TYPE_GLO_L1CA      0x0301
+/** Beidou D1 message contained in the structure. */
+#define GNSS_NAVIGATION_MESSAGE_TYPE_BDS_D1        0x0501
+/** Beidou D2 message contained in the structure. */
+#define GNSS_NAVIGATION_MESSAGE_TYPE_BDS_D2        0x0502
+/** Galileo I/NAV message contained in the structure. */
+#define GNSS_NAVIGATION_MESSAGE_TYPE_GAL_I         0x0601
+/** Galileo F/NAV message contained in the structure. */
+#define GNSS_NAVIGATION_MESSAGE_TYPE_GAL_F         0x0602
+
+/**
+ * Status of Navigation Message
+ * When a message is received properly without any parity error in its navigation words, the
+ * status should be set to NAV_MESSAGE_STATUS_PARITY_PASSED. But if a message is received
+ * with words that failed parity check, but GPS is able to correct those words, the status
+ * should be set to NAV_MESSAGE_STATUS_PARITY_REBUILT.
+ * No need to send any navigation message that contains words with parity error and cannot be
+ * corrected.
+ */
+typedef uint16_t NavigationMessageStatus;
+#define NAV_MESSAGE_STATUS_UNKNOWN              0
+#define NAV_MESSAGE_STATUS_PARITY_PASSED   (1<<0)
+#define NAV_MESSAGE_STATUS_PARITY_REBUILT  (1<<1)
+
+/* This constant is deprecated, and will be removed in the next release. */
+#define NAV_MESSAGE_STATUS_UNKONW              0
+#endif
+
+/**
+ * Flags that indicate information about the satellite
+ */
+typedef uint8_t                                 LocGnssSvFlags;
+#define LOC_GNSS_SV_FLAGS_NONE                      0
+#define LOC_GNSS_SV_FLAGS_HAS_EPHEMERIS_DATA        (1 << 0)
+#define LOC_GNSS_SV_FLAGS_HAS_ALMANAC_DATA          (1 << 1)
+#define LOC_GNSS_SV_FLAGS_USED_IN_FIX               (1 << 2)
+
+/**
+ * Constellation type of LocGnssSvInfo
+ */
+typedef uint8_t                         LocGnssConstellationType;
+#define LOC_GNSS_CONSTELLATION_UNKNOWN      0
+#define LOC_GNSS_CONSTELLATION_GPS          1
+#define LOC_GNSS_CONSTELLATION_SBAS         2
+#define LOC_GNSS_CONSTELLATION_GLONASS      3
+#define LOC_GNSS_CONSTELLATION_QZSS         4
+#define LOC_GNSS_CONSTELLATION_BEIDOU       5
+#define LOC_GNSS_CONSTELLATION_GALILEO      6
+
+/**
+ * Name for the GPS XTRA interface.
+ */
+#define LOC_GPS_XTRA_INTERFACE      "gps-xtra"
+
+/**
+ * Name for the GPS DEBUG interface.
+ */
+#define LOC_GPS_DEBUG_INTERFACE      "gps-debug"
+
+/**
+ * Name for the AGPS interface.
+ */
+
+#define LOC_AGPS_INTERFACE      "agps"
+
+/**
+ * Name of the Supl Certificate interface.
+ */
+#define LOC_SUPL_CERTIFICATE_INTERFACE  "supl-certificate"
+
+/**
+ * Name for NI interface
+ */
+#define LOC_GPS_NI_INTERFACE "gps-ni"
+
+/**
+ * Name for the AGPS-RIL interface.
+ */
+#define LOC_AGPS_RIL_INTERFACE      "agps_ril"
+
+/**
+ * Name for the GPS_Geofencing interface.
+ */
+#define LOC_GPS_GEOFENCING_INTERFACE   "gps_geofencing"
+
+/**
+ * Name of the GPS Measurements interface.
+ */
+#define LOC_GPS_MEASUREMENT_INTERFACE   "gps_measurement"
+
+/**
+ * Name of the GPS navigation message interface.
+ */
+#define LOC_GPS_NAVIGATION_MESSAGE_INTERFACE     "gps_navigation_message"
+
+/**
+ * Name of the GNSS/GPS configuration interface.
+ */
+#define LOC_GNSS_CONFIGURATION_INTERFACE     "gnss_configuration"
+
+/** Represents a location. */
+typedef struct {
+    /** set to sizeof(LocGpsLocation) */
+    uint32_t        size;
+    /** Contains LocGpsLocationFlags bits. */
+    uint16_t        flags;
+    /** The spoof mask */
+    LocGpsSpoofMask spoof_mask;
+    /** Represents latitude in degrees. */
+    double          latitude;
+    /** Represents longitude in degrees. */
+    double          longitude;
+    /**
+     * Represents altitude in meters above the WGS 84 reference ellipsoid.
+     */
+    double          altitude;
+    /** Represents horizontal speed in meters per second. */
+    float           speed;
+    /** Represents heading in degrees. */
+    float           bearing;
+    /** Represents expected accuracy in meters. */
+    float           accuracy;
+    /** Represents the expected vertical uncertainity in meters*/
+    float           vertUncertainity;
+    /** Timestamp for the location fix. */
+    LocGpsUtcTime   timestamp;
+    /** Elapsed RealTime in nanosends */
+    uint64_t        elapsedRealTime;
+    /** Elapsed Real Time Uncertainty in nanosends */
+    uint64_t        elapsedRealTimeUnc;
+} LocGpsLocation;
+
+/** Represents the status. */
+typedef struct {
+    /** set to sizeof(LocGpsStatus) */
+    size_t          size;
+    LocGpsStatusValue status;
+} LocGpsStatus;
+
+/**
+ * Legacy struct to represents SV information.
+ * Deprecated, to be removed in the next Android release.
+ * Use LocGnssSvInfo instead.
+ */
+typedef struct {
+    /** set to sizeof(LocGpsSvInfo) */
+    size_t          size;
+    /** Pseudo-random number for the SV. */
+    int     prn;
+    /** Signal to noise ratio. */
+    float   snr;
+    /** Elevation of SV in degrees. */
+    float   elevation;
+    /** Azimuth of SV in degrees. */
+    float   azimuth;
+} LocGpsSvInfo;
+
+typedef struct {
+    /** set to sizeof(LocGnssSvInfo) */
+    size_t size;
+
+    /**
+     * Pseudo-random number for the SV, or FCN/OSN number for Glonass. The
+     * distinction is made by looking at constellation field. Values should be
+     * in the range of:
+     *
+     * - GPS:     1-32
+     * - SBAS:    120-151, 183-192
+     * - GLONASS: 1-24, the orbital slot number (OSN), if known.  Or, if not:
+     *            93-106, the frequency channel number (FCN) (-7 to +6) offset by + 100
+     *            i.e. report an FCN of -7 as 93, FCN of 0 as 100, and FCN of +6 as 106.
+     * - QZSS:    193-200
+     * - Galileo: 1-36
+     * - Beidou:  1-37
+     */
+    int16_t svid;
+
+    /**
+     * Defines the constellation of the given SV. Value should be one of those
+     * LOC_GNSS_CONSTELLATION_* constants
+     */
+    LocGnssConstellationType constellation;
+
+    /**
+     * Carrier-to-noise density in dB-Hz, typically in the range [0, 63].
+     * It contains the measured C/N0 value for the signal at the antenna port.
+     *
+     * This is a mandatory value.
+     */
+    float c_n0_dbhz;
+
+    /** Elevation of SV in degrees. */
+    float elevation;
+
+    /** Azimuth of SV in degrees. */
+    float azimuth;
+
+    /**
+     * Contains additional data about the given SV. Value should be one of those
+     * LOC_GNSS_SV_FLAGS_* constants
+     */
+    LocGnssSvFlags flags;
+
+} LocGnssSvInfo;
+
+/**
+ * Legacy struct to represents SV status.
+ * Deprecated, to be removed in the next Android release.
+ * Use LocGnssSvStatus instead.
+ */
+typedef struct {
+    /** set to sizeof(LocGpsSvStatus) */
+    size_t size;
+    int num_svs;
+    LocGpsSvInfo sv_list[LOC_GPS_MAX_SVS];
+    uint32_t ephemeris_mask;
+    uint32_t almanac_mask;
+    uint32_t used_in_fix_mask;
+} LocGpsSvStatus;
+
+/**
+ * Represents SV status.
+ */
+typedef struct {
+    /** set to sizeof(LocGnssSvStatus) */
+    size_t size;
+
+    /** Number of GPS SVs currently visible, refers to the SVs stored in sv_list */
+    int num_svs;
+    /**
+     * Pointer to an array of SVs information for all GNSS constellations,
+     * except GPS, which is reported using sv_list
+     */
+    LocGnssSvInfo gnss_sv_list[LOC_GNSS_MAX_SVS];
+
+} LocGnssSvStatus;
+
+/* CellID for 2G, 3G and LTE, used in AGPS. */
+typedef struct {
+    LocAGpsRefLocationType type;
+    /** Mobile Country Code. */
+    uint16_t mcc;
+    /** Mobile Network Code .*/
+    uint16_t mnc;
+    /** Location Area Code in 2G, 3G and LTE. In 3G lac is discarded. In LTE,
+     * lac is populated with tac, to ensure that we don't break old clients that
+     * might rely in the old (wrong) behavior.
+     */
+    uint16_t lac;
+    /** Cell id in 2G. Utran Cell id in 3G. Cell Global Id EUTRA in LTE. */
+    uint32_t cid;
+    /** Tracking Area Code in LTE. */
+    uint16_t tac;
+    /** Physical Cell id in LTE (not used in 2G and 3G) */
+    uint16_t pcid;
+} LocAGpsRefLocationCellID;
+
+typedef struct {
+    uint8_t mac[6];
+} LocAGpsRefLocationMac;
+
+/** Represents ref locations */
+typedef struct {
+    LocAGpsRefLocationType type;
+    union {
+        LocAGpsRefLocationCellID   cellID;
+        LocAGpsRefLocationMac      mac;
+    } u;
+} LocAGpsRefLocation;
+
+/**
+ * Callback with location information. Can only be called from a thread created
+ * by create_thread_cb.
+ */
+typedef void (* loc_gps_location_callback)(LocGpsLocation* location);
+
+/**
+ * Callback with status information. Can only be called from a thread created by
+ * create_thread_cb.
+ */
+typedef void (* loc_gps_status_callback)(LocGpsStatus* status);
+/**
+ * Legacy callback with SV status information.
+ * Can only be called from a thread created by create_thread_cb.
+ *
+ * This callback is deprecated, and will be removed in the next release. Use
+ * loc_gnss_sv_status_callback() instead.
+ */
+typedef void (* loc_gps_sv_status_callback)(LocGpsSvStatus* sv_info);
+
+/**
+ * Callback with SV status information.
+ * Can only be called from a thread created by create_thread_cb.
+ */
+typedef void (* loc_gnss_sv_status_callback)(LocGnssSvStatus* sv_info);
+
+/**
+ * Callback for reporting NMEA sentences. Can only be called from a thread
+ * created by create_thread_cb.
+ */
+typedef void (* loc_gps_nmea_callback)(LocGpsUtcTime timestamp, const char* nmea, int length);
+
+/**
+ * Callback to inform framework of the GPS engine's capabilities. Capability
+ * parameter is a bit field of LOC_GPS_CAPABILITY_* flags.
+ */
+typedef void (* loc_gps_set_capabilities)(uint32_t capabilities);
+
+/**
+ * Callback utility for acquiring the GPS wakelock. This can be used to prevent
+ * the CPU from suspending while handling GPS events.
+ */
+typedef void (* loc_gps_acquire_wakelock)();
+
+/** Callback utility for releasing the GPS wakelock. */
+typedef void (* loc_gps_release_wakelock)();
+
+/** Callback for requesting NTP time */
+typedef void (* loc_gps_request_utc_time)();
+
+/**
+ * Callback for creating a thread that can call into the Java framework code.
+ * This must be used to create any threads that report events up to the
+ * framework.
+ */
+typedef pthread_t (* loc_gps_create_thread)(const char* name, void (*start)(void *), void* arg);
+
+/**
+ * Provides information about how new the underlying GPS/GNSS hardware and
+ * software is.
+ *
+ * This information will be available for Android Test Applications. If a GPS
+ * HAL does not provide this information, it will be considered "2015 or
+ * earlier".
+ *
+ * If a GPS HAL does provide this information, then newer years will need to
+ * meet newer CTS standards. E.g. if the date are 2016 or above, then N+ level
+ * LocGpsMeasurement support will be verified.
+ */
+typedef struct {
+    /** Set to sizeof(LocGnssSystemInfo) */
+    size_t   size;
+    /* year in which the last update was made to the underlying hardware/firmware
+     * used to capture GNSS signals, e.g. 2016 */
+    uint16_t year_of_hw;
+} LocGnssSystemInfo;
+
+/**
+ * Callback to inform framework of the engine's hardware version information.
+ */
+typedef void (*loc_gnss_set_system_info)(const LocGnssSystemInfo* info);
+
+/** New GPS callback structure. */
+typedef struct {
+    /** set to sizeof(LocGpsCallbacks) */
+    size_t      size;
+    loc_gps_location_callback location_cb;
+    loc_gps_status_callback status_cb;
+    loc_gps_sv_status_callback sv_status_cb;
+    loc_gps_nmea_callback nmea_cb;
+    loc_gps_set_capabilities set_capabilities_cb;
+    loc_gps_acquire_wakelock acquire_wakelock_cb;
+    loc_gps_release_wakelock release_wakelock_cb;
+    loc_gps_create_thread create_thread_cb;
+    loc_gps_request_utc_time request_utc_time_cb;
+
+    loc_gnss_set_system_info set_system_info_cb;
+    loc_gnss_sv_status_callback gnss_sv_status_cb;
+} LocGpsCallbacks;
+
+/** Represents the standard GPS interface. */
+typedef struct {
+    /** set to sizeof(LocGpsInterface) */
+    size_t          size;
+    /**
+     * Opens the interface and provides the callback routines
+     * to the implementation of this interface.
+     */
+    int   (*init)( LocGpsCallbacks* callbacks );
+
+    /** Starts navigating. */
+    int   (*start)( void );
+
+    /** Stops navigating. */
+    int   (*stop)( void );
+
+    /** Closes the interface. */
+    void  (*cleanup)( void );
+
+    /** Injects the current time. */
+    int   (*inject_time)(LocGpsUtcTime time, int64_t timeReference,
+                         int uncertainty);
+
+    /**
+     * Injects current location from another location provider (typically cell
+     * ID). Latitude and longitude are measured in degrees expected accuracy is
+     * measured in meters
+     */
+    int  (*inject_location)(double latitude, double longitude, float accuracy);
+
+    /**
+     * Specifies that the next call to start will not use the
+     * information defined in the flags. LOC_GPS_DELETE_ALL is passed for
+     * a cold start.
+     */
+    void  (*delete_aiding_data)(LocGpsAidingData flags);
+
+    /**
+     * min_interval represents the time between fixes in milliseconds.
+     * preferred_accuracy represents the requested fix accuracy in meters.
+     * preferred_time represents the requested time to first fix in milliseconds.
+     *
+     * 'mode' parameter should be one of LOC_GPS_POSITION_MODE_MS_BASED
+     * or LOC_GPS_POSITION_MODE_STANDALONE.
+     * It is allowed by the platform (and it is recommended) to fallback to
+     * LOC_GPS_POSITION_MODE_MS_BASED if LOC_GPS_POSITION_MODE_MS_ASSISTED is passed in, and
+     * LOC_GPS_POSITION_MODE_MS_BASED is supported.
+     */
+    int   (*set_position_mode)(LocGpsPositionMode mode, LocGpsPositionRecurrence recurrence,
+            uint32_t min_interval, uint32_t preferred_accuracy, uint32_t preferred_time);
+
+    /** Get a pointer to extension information. */
+    const void* (*get_extension)(const char* name);
+} LocGpsInterface;
+
+/**
+ * Callback to request the client to download XTRA data. The client should
+ * download XTRA data and inject it by calling inject_xtra_data(). Can only be
+ * called from a thread created by create_thread_cb.
+ */
+typedef void (* loc_gps_xtra_download_request)();
+
+/** Callback structure for the XTRA interface. */
+typedef struct {
+    loc_gps_xtra_download_request download_request_cb;
+    loc_gps_create_thread create_thread_cb;
+} LocGpsXtraCallbacks;
+
+/** Extended interface for XTRA support. */
+typedef struct {
+    /** set to sizeof(LocGpsXtraInterface) */
+    size_t          size;
+    /**
+     * Opens the XTRA interface and provides the callback routines
+     * to the implementation of this interface.
+     */
+    int  (*init)( LocGpsXtraCallbacks* callbacks );
+    /** Injects XTRA data into the GPS. */
+    int  (*inject_xtra_data)( char* data, int length );
+} LocGpsXtraInterface;
+
+#if 0
+/** Extended interface for DEBUG support. */
+typedef struct {
+    /** set to sizeof(LocGpsDebugInterface) */
+    size_t          size;
+
+    /**
+     * This function should return any information that the native
+     * implementation wishes to include in a bugreport.
+     */
+    size_t (*get_internal_state)(char* buffer, size_t bufferSize);
+} LocGpsDebugInterface;
+#endif
+
+/*
+ * Represents the status of AGPS augmented to support IPv4 and IPv6.
+ */
+typedef struct {
+    /** set to sizeof(LocAGpsStatus) */
+    size_t                  size;
+
+    LocAGpsType                type;
+    LocAGpsStatusValue         status;
+
+    /**
+     * Must be set to a valid IPv4 address if the field 'addr' contains an IPv4
+     * address, or set to INADDR_NONE otherwise.
+     */
+    uint32_t                ipaddr;
+
+    /**
+     * Must contain the IPv4 (AF_INET) or IPv6 (AF_INET6) address to report.
+     * Any other value of addr.ss_family will be rejected.
+     */
+    struct sockaddr_storage addr;
+} LocAGpsStatus;
+
+/**
+ * Callback with AGPS status information. Can only be called from a thread
+ * created by create_thread_cb.
+ */
+typedef void (* loc_agps_status_callback)(LocAGpsStatus* status);
+
+/** Callback structure for the AGPS interface. */
+typedef struct {
+    loc_agps_status_callback status_cb;
+    loc_gps_create_thread create_thread_cb;
+} LocAGpsCallbacks;
+
+/**
+ * Extended interface for AGPS support, it is augmented to enable to pass
+ * extra APN data.
+ */
+typedef struct {
+    /** set to sizeof(LocAGpsInterface) */
+    size_t size;
+
+    /**
+     * Opens the AGPS interface and provides the callback routines to the
+     * implementation of this interface.
+     */
+    void (*init)(LocAGpsCallbacks* callbacks);
+    /**
+     * Deprecated.
+     * If the HAL supports LocAGpsInterface_v2 this API will not be used, see
+     * data_conn_open_with_apn_ip_type for more information.
+     */
+    int (*data_conn_open)(const char* apn);
+    /**
+     * Notifies that the AGPS data connection has been closed.
+     */
+    int (*data_conn_closed)();
+    /**
+     * Notifies that a data connection is not available for AGPS.
+     */
+    int (*data_conn_failed)();
+    /**
+     * Sets the hostname and port for the AGPS server.
+     */
+    int (*set_server)(LocAGpsType type, const char* hostname, int port);
+
+    /**
+     * Notifies that a data connection is available and sets the name of the
+     * APN, and its IP type, to be used for SUPL connections.
+     */
+    int (*data_conn_open_with_apn_ip_type)(
+            const char* apn,
+            LocApnIpType apnIpType);
+} LocAGpsInterface;
+
+/** Error codes associated with certificate operations */
+#define LOC_AGPS_CERTIFICATE_OPERATION_SUCCESS               0
+#define LOC_AGPS_CERTIFICATE_ERROR_GENERIC                -100
+#define LOC_AGPS_CERTIFICATE_ERROR_TOO_MANY_CERTIFICATES  -101
+
+/** A data structure that represents an X.509 certificate using DER encoding */
+typedef struct {
+    size_t  length;
+    u_char* data;
+} LocDerEncodedCertificate;
+
+/**
+ * A type definition for SHA1 Fingerprints used to identify X.509 Certificates
+ * The Fingerprint is a digest of the DER Certificate that uniquely identifies it.
+ */
+typedef struct {
+    u_char data[20];
+} LocSha1CertificateFingerprint;
+
+/** AGPS Interface to handle SUPL certificate operations */
+typedef struct {
+    /** set to sizeof(LocSuplCertificateInterface) */
+    size_t size;
+
+    /**
+     * Installs a set of Certificates used for SUPL connections to the AGPS server.
+     * If needed the HAL should find out internally any certificates that need to be removed to
+     * accommodate the certificates to install.
+     * The certificates installed represent a full set of valid certificates needed to connect to
+     * AGPS SUPL servers.
+     * The list of certificates is required, and all must be available at the same time, when trying
+     * to establish a connection with the AGPS Server.
+     *
+     * Parameters:
+     *      certificates - A pointer to an array of DER encoded certificates that are need to be
+     *                     installed in the HAL.
+     *      length - The number of certificates to install.
+     * Returns:
+     *      LOC_AGPS_CERTIFICATE_OPERATION_SUCCESS if the operation is completed successfully
+     *      LOC_AGPS_CERTIFICATE_ERROR_TOO_MANY_CERTIFICATES if the HAL cannot store the number of
+     *          certificates attempted to be installed, the state of the certificates stored should
+     *          remain the same as before on this error case.
+     *
+     * IMPORTANT:
+     *      If needed the HAL should find out internally the set of certificates that need to be
+     *      removed to accommodate the certificates to install.
+     */
+    int  (*install_certificates) ( const LocDerEncodedCertificate* certificates, size_t length );
+
+    /**
+     * Notifies the HAL that a list of certificates used for SUPL connections are revoked. It is
+     * expected that the given set of certificates is removed from the internal store of the HAL.
+     *
+     * Parameters:
+     *      fingerprints - A pointer to an array of SHA1 Fingerprints to identify the set of
+     *                     certificates to revoke.
+     *      length - The number of fingerprints provided.
+     * Returns:
+     *      LOC_AGPS_CERTIFICATE_OPERATION_SUCCESS if the operation is completed successfully.
+     *
+     * IMPORTANT:
+     *      If any of the certificates provided (through its fingerprint) is not known by the HAL,
+     *      it should be ignored and continue revoking/deleting the rest of them.
+     */
+    int  (*revoke_certificates) ( const LocSha1CertificateFingerprint* fingerprints, size_t length );
+} LocSuplCertificateInterface;
+
+/** Represents an NI request */
+typedef struct {
+    /** set to sizeof(LocGpsNiNotification) */
+    size_t          size;
+
+    /**
+     * An ID generated by HAL to associate NI notifications and UI
+     * responses
+     */
+    int             notification_id;
+
+    /**
+     * An NI type used to distinguish different categories of NI
+     * events, such as LOC_GPS_NI_TYPE_VOICE, LOC_GPS_NI_TYPE_UMTS_SUPL, ...
+     */
+    LocGpsNiType       ni_type;
+
+    /**
+     * Notification/verification options, combinations of LocGpsNiNotifyFlags constants
+     */
+    LocGpsNiNotifyFlags notify_flags;
+
+    /**
+     * Timeout period to wait for user response.
+     * Set to 0 for no time out limit.
+     */
+    int             timeout;
+
+    /**
+     * Default response when time out.
+     */
+    LocGpsUserResponseType default_response;
+
+    /**
+     * Requestor ID
+     */
+    char            requestor_id[LOC_GPS_NI_SHORT_STRING_MAXLEN];
+
+    /**
+     * Notification message. It can also be used to store client_id in some cases
+     */
+    char            text[LOC_GPS_NI_LONG_STRING_MAXLEN];
+
+    /**
+     * Client name decoding scheme
+     */
+    LocGpsNiEncodingType requestor_id_encoding;
+
+    /**
+     * Client name decoding scheme
+     */
+    LocGpsNiEncodingType text_encoding;
+
+    /**
+     * A pointer to extra data. Format:
+     * key_1 = value_1
+     * key_2 = value_2
+     */
+    char           extras[LOC_GPS_NI_LONG_STRING_MAXLEN];
+
+} LocGpsNiNotification;
+
+/**
+ * Callback with NI notification. Can only be called from a thread created by
+ * create_thread_cb.
+ */
+typedef void (*loc_gps_ni_notify_callback)(LocGpsNiNotification *notification);
+
+/** GPS NI callback structure. */
+typedef struct
+{
+    /**
+     * Sends the notification request from HAL to GPSLocationProvider.
+     */
+    loc_gps_ni_notify_callback notify_cb;
+    loc_gps_create_thread create_thread_cb;
+} LocGpsNiCallbacks;
+
+/**
+ * Extended interface for Network-initiated (NI) support.
+ */
+typedef struct
+{
+    /** set to sizeof(LocGpsNiInterface) */
+    size_t          size;
+
+   /** Registers the callbacks for HAL to use. */
+   void (*init) (LocGpsNiCallbacks *callbacks);
+
+   /** Sends a response to HAL. */
+   void (*respond) (int notif_id, LocGpsUserResponseType user_response);
+} LocGpsNiInterface;
+
+#define LOC_AGPS_RIL_REQUEST_SETID_IMSI     (1<<0L)
+#define LOC_AGPS_RIL_REQUEST_SETID_MSISDN   (1<<1L)
+
+#define LOC_AGPS_RIL_REQUEST_REFLOC_CELLID  (1<<0L)
+#define LOC_AGPS_RIL_REQUEST_REFLOC_MAC     (1<<1L)
+
+typedef void (*loc_agps_ril_request_set_id)(uint32_t flags);
+typedef void (*loc_agps_ril_request_ref_loc)(uint32_t flags);
+
+typedef struct {
+    loc_agps_ril_request_set_id request_setid;
+    loc_agps_ril_request_ref_loc request_refloc;
+    loc_gps_create_thread create_thread_cb;
+} LocAGpsRilCallbacks;
+
+/** Extended interface for AGPS_RIL support. */
+typedef struct {
+    /** set to sizeof(LocAGpsRilInterface) */
+    size_t          size;
+    /**
+     * Opens the AGPS interface and provides the callback routines
+     * to the implementation of this interface.
+     */
+    void  (*init)( LocAGpsRilCallbacks* callbacks );
+
+    /**
+     * Sets the reference location.
+     */
+    void (*set_ref_location) (const LocAGpsRefLocation *agps_reflocation, size_t sz_struct);
+    /**
+     * Sets the set ID.
+     */
+    void (*set_set_id) (LocAGpsSetIDType type, const char* setid);
+
+    /**
+     * Send network initiated message.
+     */
+    void (*ni_message) (uint8_t *msg, size_t len);
+
+    /**
+     * Notify GPS of network status changes.
+     * These parameters match values in the android.net.NetworkInfo class.
+     */
+    void (*update_network_state) (int connected, int type, int roaming, const char* extra_info);
+
+    /**
+     * Notify GPS of network status changes.
+     * These parameters match values in the android.net.NetworkInfo class.
+     */
+    void (*update_network_availability) (int avaiable, const char* apn);
+} LocAGpsRilInterface;
+
+/**
+ * GPS Geofence.
+ *      There are 3 states associated with a Geofence: Inside, Outside, Unknown.
+ * There are 3 transitions: ENTERED, EXITED, UNCERTAIN.
+ *
+ * An example state diagram with confidence level: 95% and Unknown time limit
+ * set as 30 secs is shown below. (confidence level and Unknown time limit are
+ * explained latter)
+ *                         ____________________________
+ *                        |       Unknown (30 secs)   |
+ *                         """"""""""""""""""""""""""""
+ *                            ^ |                  |  ^
+ *                   UNCERTAIN| |ENTERED     EXITED|  |UNCERTAIN
+ *                            | v                  v  |
+ *                        ________    EXITED     _________
+ *                       | Inside | -----------> | Outside |
+ *                       |        | <----------- |         |
+ *                        """"""""    ENTERED    """""""""
+ *
+ * Inside state: We are 95% confident that the user is inside the geofence.
+ * Outside state: We are 95% confident that the user is outside the geofence
+ * Unknown state: Rest of the time.
+ *
+ * The Unknown state is better explained with an example:
+ *
+ *                            __________
+ *                           |         c|
+ *                           |  ___     |    _______
+ *                           |  |a|     |   |   b   |
+ *                           |  """     |    """""""
+ *                           |          |
+ *                            """"""""""
+ * In the diagram above, "a" and "b" are 2 geofences and "c" is the accuracy
+ * circle reported by the GPS subsystem. Now with regard to "b", the system is
+ * confident that the user is outside. But with regard to "a" is not confident
+ * whether it is inside or outside the geofence. If the accuracy remains the
+ * same for a sufficient period of time, the UNCERTAIN transition would be
+ * triggered with the state set to Unknown. If the accuracy improves later, an
+ * appropriate transition should be triggered.  This "sufficient period of time"
+ * is defined by the parameter in the add_geofence_area API.
+ *     In other words, Unknown state can be interpreted as a state in which the
+ * GPS subsystem isn't confident enough that the user is either inside or
+ * outside the Geofence. It moves to Unknown state only after the expiry of the
+ * timeout.
+ *
+ * The geofence callback needs to be triggered for the ENTERED and EXITED
+ * transitions, when the GPS system is confident that the user has entered
+ * (Inside state) or exited (Outside state) the Geofence. An implementation
+ * which uses a value of 95% as the confidence is recommended. The callback
+ * should be triggered only for the transitions requested by the
+ * add_geofence_area call.
+ *
+ * Even though the diagram and explanation talks about states and transitions,
+ * the callee is only interested in the transistions. The states are mentioned
+ * here for illustrative purposes.
+ *
+ * Startup Scenario: When the device boots up, if an application adds geofences,
+ * and then we get an accurate GPS location fix, it needs to trigger the
+ * appropriate (ENTERED or EXITED) transition for every Geofence it knows about.
+ * By default, all the Geofences will be in the Unknown state.
+ *
+ * When the GPS system is unavailable, loc_gps_geofence_status_callback should be
+ * called to inform the upper layers of the same. Similarly, when it becomes
+ * available the callback should be called. This is a global state while the
+ * UNKNOWN transition described above is per geofence.
+ *
+ * An important aspect to note is that users of this API (framework), will use
+ * other subsystems like wifi, sensors, cell to handle Unknown case and
+ * hopefully provide a definitive state transition to the third party
+ * application. GPS Geofence will just be a signal indicating what the GPS
+ * subsystem knows about the Geofence.
+ *
+ */
+#define LOC_GPS_GEOFENCE_ENTERED     (1<<0L)
+#define LOC_GPS_GEOFENCE_EXITED      (1<<1L)
+#define LOC_GPS_GEOFENCE_UNCERTAIN   (1<<2L)
+
+#define LOC_GPS_GEOFENCE_UNAVAILABLE (1<<0L)
+#define LOC_GPS_GEOFENCE_AVAILABLE   (1<<1L)
+
+#define LOC_GPS_GEOFENCE_OPERATION_SUCCESS           0
+#define LOC_GPS_GEOFENCE_ERROR_TOO_MANY_GEOFENCES -100
+#define LOC_GPS_GEOFENCE_ERROR_ID_EXISTS          -101
+#define LOC_GPS_GEOFENCE_ERROR_ID_UNKNOWN         -102
+#define LOC_GPS_GEOFENCE_ERROR_INVALID_TRANSITION -103
+#define LOC_GPS_GEOFENCE_ERROR_GENERIC            -149
+
+/**
+ * The callback associated with the geofence.
+ * Parameters:
+ *      geofence_id - The id associated with the add_geofence_area.
+ *      location    - The current GPS location.
+ *      transition  - Can be one of LOC_GPS_GEOFENCE_ENTERED, LOC_GPS_GEOFENCE_EXITED,
+ *                    LOC_GPS_GEOFENCE_UNCERTAIN.
+ *      timestamp   - Timestamp when the transition was detected.
+ *
+ * The callback should only be called when the caller is interested in that
+ * particular transition. For instance, if the caller is interested only in
+ * ENTERED transition, then the callback should NOT be called with the EXITED
+ * transition.
+ *
+ * IMPORTANT: If a transition is triggered resulting in this callback, the GPS
+ * subsystem will wake up the application processor, if its in suspend state.
+ */
+typedef void (*loc_gps_geofence_transition_callback) (int32_t geofence_id,  LocGpsLocation* location,
+        int32_t transition, LocGpsUtcTime timestamp);
+
+/**
+ * The callback associated with the availability of the GPS system for geofencing
+ * monitoring. If the GPS system determines that it cannot monitor geofences
+ * because of lack of reliability or unavailability of the GPS signals, it will
+ * call this callback with LOC_GPS_GEOFENCE_UNAVAILABLE parameter.
+ *
+ * Parameters:
+ *  status - LOC_GPS_GEOFENCE_UNAVAILABLE or LOC_GPS_GEOFENCE_AVAILABLE.
+ *  last_location - Last known location.
+ */
+typedef void (*loc_gps_geofence_status_callback) (int32_t status, LocGpsLocation* last_location);
+
+/**
+ * The callback associated with the add_geofence call.
+ *
+ * Parameter:
+ * geofence_id - Id of the geofence.
+ * status - LOC_GPS_GEOFENCE_OPERATION_SUCCESS
+ *          LOC_GPS_GEOFENCE_ERROR_TOO_MANY_GEOFENCES  - geofence limit has been reached.
+ *          LOC_GPS_GEOFENCE_ERROR_ID_EXISTS  - geofence with id already exists
+ *          LOC_GPS_GEOFENCE_ERROR_INVALID_TRANSITION - the monitorTransition contains an
+ *              invalid transition
+ *          LOC_GPS_GEOFENCE_ERROR_GENERIC - for other errors.
+ */
+typedef void (*loc_gps_geofence_add_callback) (int32_t geofence_id, int32_t status);
+
+/**
+ * The callback associated with the remove_geofence call.
+ *
+ * Parameter:
+ * geofence_id - Id of the geofence.
+ * status - LOC_GPS_GEOFENCE_OPERATION_SUCCESS
+ *          LOC_GPS_GEOFENCE_ERROR_ID_UNKNOWN - for invalid id
+ *          LOC_GPS_GEOFENCE_ERROR_GENERIC for others.
+ */
+typedef void (*loc_gps_geofence_remove_callback) (int32_t geofence_id, int32_t status);
+
+
+/**
+ * The callback associated with the pause_geofence call.
+ *
+ * Parameter:
+ * geofence_id - Id of the geofence.
+ * status - LOC_GPS_GEOFENCE_OPERATION_SUCCESS
+ *          LOC_GPS_GEOFENCE_ERROR_ID_UNKNOWN - for invalid id
+ *          LOC_GPS_GEOFENCE_ERROR_INVALID_TRANSITION -
+ *                    when monitor_transitions is invalid
+ *          LOC_GPS_GEOFENCE_ERROR_GENERIC for others.
+ */
+typedef void (*loc_gps_geofence_pause_callback) (int32_t geofence_id, int32_t status);
+
+/**
+ * The callback associated with the resume_geofence call.
+ *
+ * Parameter:
+ * geofence_id - Id of the geofence.
+ * status - LOC_GPS_GEOFENCE_OPERATION_SUCCESS
+ *          LOC_GPS_GEOFENCE_ERROR_ID_UNKNOWN - for invalid id
+ *          LOC_GPS_GEOFENCE_ERROR_GENERIC for others.
+ */
+typedef void (*loc_gps_geofence_resume_callback) (int32_t geofence_id, int32_t status);
+
+typedef struct {
+    loc_gps_geofence_transition_callback geofence_transition_callback;
+    loc_gps_geofence_status_callback geofence_status_callback;
+    loc_gps_geofence_add_callback geofence_add_callback;
+    loc_gps_geofence_remove_callback geofence_remove_callback;
+    loc_gps_geofence_pause_callback geofence_pause_callback;
+    loc_gps_geofence_resume_callback geofence_resume_callback;
+    loc_gps_create_thread create_thread_cb;
+} LocGpsGeofenceCallbacks;
+
+/** Extended interface for GPS_Geofencing support */
+typedef struct {
+   /** set to sizeof(LocGpsGeofencingInterface) */
+   size_t          size;
+
+   /**
+    * Opens the geofence interface and provides the callback routines
+    * to the implementation of this interface.
+    */
+   void  (*init)( LocGpsGeofenceCallbacks* callbacks );
+
+   /**
+    * Add a geofence area. This api currently supports circular geofences.
+    * Parameters:
+    *    geofence_id - The id for the geofence. If a geofence with this id
+    *       already exists, an error value (LOC_GPS_GEOFENCE_ERROR_ID_EXISTS)
+    *       should be returned.
+    *    latitude, longtitude, radius_meters - The lat, long and radius
+    *       (in meters) for the geofence
+    *    last_transition - The current state of the geofence. For example, if
+    *       the system already knows that the user is inside the geofence,
+    *       this will be set to LOC_GPS_GEOFENCE_ENTERED. In most cases, it
+    *       will be LOC_GPS_GEOFENCE_UNCERTAIN.
+    *    monitor_transition - Which transitions to monitor. Bitwise OR of
+    *       LOC_GPS_GEOFENCE_ENTERED, LOC_GPS_GEOFENCE_EXITED and
+    *       LOC_GPS_GEOFENCE_UNCERTAIN.
+    *    notification_responsiveness_ms - Defines the best-effort description
+    *       of how soon should the callback be called when the transition
+    *       associated with the Geofence is triggered. For instance, if set
+    *       to 1000 millseconds with LOC_GPS_GEOFENCE_ENTERED, the callback
+    *       should be called 1000 milliseconds within entering the geofence.
+    *       This parameter is defined in milliseconds.
+    *       NOTE: This is not to be confused with the rate that the GPS is
+    *       polled at. It is acceptable to dynamically vary the rate of
+    *       sampling the GPS for power-saving reasons; thus the rate of
+    *       sampling may be faster or slower than this.
+    *    unknown_timer_ms - The time limit after which the UNCERTAIN transition
+    *       should be triggered. This parameter is defined in milliseconds.
+    *       See above for a detailed explanation.
+    */
+   void (*add_geofence_area) (int32_t geofence_id, double latitude, double longitude,
+       double radius_meters, int last_transition, int monitor_transitions,
+       int notification_responsiveness_ms, int unknown_timer_ms);
+
+   /**
+    * Pause monitoring a particular geofence.
+    * Parameters:
+    *   geofence_id - The id for the geofence.
+    */
+   void (*pause_geofence) (int32_t geofence_id);
+
+   /**
+    * Resume monitoring a particular geofence.
+    * Parameters:
+    *   geofence_id - The id for the geofence.
+    *   monitor_transitions - Which transitions to monitor. Bitwise OR of
+    *       LOC_GPS_GEOFENCE_ENTERED, LOC_GPS_GEOFENCE_EXITED and
+    *       LOC_GPS_GEOFENCE_UNCERTAIN.
+    *       This supersedes the value associated provided in the
+    *       add_geofence_area call.
+    */
+   void (*resume_geofence) (int32_t geofence_id, int monitor_transitions);
+
+   /**
+    * Remove a geofence area. After the function returns, no notifications
+    * should be sent.
+    * Parameter:
+    *   geofence_id - The id for the geofence.
+    */
+   void (*remove_geofence_area) (int32_t geofence_id);
+} LocGpsGeofencingInterface;
+
+/**
+ * Legacy struct to represent an estimate of the GPS clock time.
+ * Deprecated, to be removed in the next Android release.
+ * Use LocGnssClock instead.
+ */
+typedef struct {
+    /** set to sizeof(LocGpsClock) */
+    size_t size;
+    LocGpsClockFlags flags;
+    int16_t leap_second;
+    LocGpsClockType type;
+    int64_t time_ns;
+    double time_uncertainty_ns;
+    int64_t full_bias_ns;
+    double bias_ns;
+    double bias_uncertainty_ns;
+    double drift_nsps;
+    double drift_uncertainty_nsps;
+} LocGpsClock;
+
+/**
+ * Represents an estimate of the GPS clock time.
+ */
+typedef struct {
+    /** set to sizeof(LocGnssClock) */
+    size_t size;
+
+    /**
+     * A set of flags indicating the validity of the fields in this data
+     * structure.
+     */
+    LocGnssClockFlags flags;
+
+    /**
+     * Leap second data.
+     * The sign of the value is defined by the following equation:
+     *      utc_time_ns = time_ns - (full_bias_ns + bias_ns) - leap_second *
+     *      1,000,000,000
+     *
+     * If the data is available 'flags' must contain LOC_GNSS_CLOCK_HAS_LEAP_SECOND.
+     */
+    int16_t leap_second;
+
+    /**
+     * The GNSS receiver internal clock value. This is the local hardware clock
+     * value.
+     *
+     * For local hardware clock, this value is expected to be monotonically
+     * increasing while the hardware clock remains power on. (For the case of a
+     * HW clock that is not continuously on, see the
+     * hw_clock_discontinuity_count field). The receiver's estimate of GPS time
+     * can be derived by substracting the sum of full_bias_ns and bias_ns (when
+     * available) from this value.
+     *
+     * This GPS time is expected to be the best estimate of current GPS time
+     * that GNSS receiver can achieve.
+     *
+     * Sub-nanosecond accuracy can be provided by means of the 'bias_ns' field.
+     * The value contains the 'time uncertainty' in it.
+     *
+     * This field is mandatory.
+     */
+    int64_t time_ns;
+
+    /**
+     * 1-Sigma uncertainty associated with the clock's time in nanoseconds.
+     * The uncertainty is represented as an absolute (single sided) value.
+     *
+     * If the data is available, 'flags' must contain
+     * LOC_GNSS_CLOCK_HAS_TIME_UNCERTAINTY. This value is effectively zero (it is
+     * the reference local clock, by which all other times and time
+     * uncertainties are measured.)  (And thus this field can be not provided,
+     * per LOC_GNSS_CLOCK_HAS_TIME_UNCERTAINTY flag, or provided & set to 0.)
+     */
+    double time_uncertainty_ns;
+
+    /**
+     * The difference between hardware clock ('time' field) inside GPS receiver
+     * and the true GPS time since 0000Z, January 6, 1980, in nanoseconds.
+     *
+     * The sign of the value is defined by the following equation:
+     *      local estimate of GPS time = time_ns - (full_bias_ns + bias_ns)
+     *
+     * This value is mandatory if the receiver has estimated GPS time. If the
+     * computed time is for a non-GPS constellation, the time offset of that
+     * constellation to GPS has to be applied to fill this value. The error
+     * estimate for the sum of this and the bias_ns is the bias_uncertainty_ns,
+     * and the caller is responsible for using this uncertainty (it can be very
+     * large before the GPS time has been solved for.) If the data is available
+     * 'flags' must contain LOC_GNSS_CLOCK_HAS_FULL_BIAS.
+     */
+    int64_t full_bias_ns;
+
+    /**
+     * Sub-nanosecond bias.
+     * The error estimate for the sum of this and the full_bias_ns is the
+     * bias_uncertainty_ns
+     *
+     * If the data is available 'flags' must contain LOC_GNSS_CLOCK_HAS_BIAS. If GPS
+     * has computed a position fix. This value is mandatory if the receiver has
+     * estimated GPS time.
+     */
+    double bias_ns;
+
+    /**
+     * 1-Sigma uncertainty associated with the local estimate of GPS time (clock
+     * bias) in nanoseconds. The uncertainty is represented as an absolute
+     * (single sided) value.
+     *
+     * If the data is available 'flags' must contain
+     * LOC_GNSS_CLOCK_HAS_BIAS_UNCERTAINTY. This value is mandatory if the receiver
+     * has estimated GPS time.
+     */
+    double bias_uncertainty_ns;
+
+    /**
+     * The clock's drift in nanoseconds (per second).
+     *
+     * A positive value means that the frequency is higher than the nominal
+     * frequency, and that the (full_bias_ns + bias_ns) is growing more positive
+     * over time.
+     *
+     * The value contains the 'drift uncertainty' in it.
+     * If the data is available 'flags' must contain LOC_GNSS_CLOCK_HAS_DRIFT.
+     *
+     * This value is mandatory if the receiver has estimated GNSS time
+     */
+    double drift_nsps;
+
+    /**
+     * 1-Sigma uncertainty associated with the clock's drift in nanoseconds (per second).
+     * The uncertainty is represented as an absolute (single sided) value.
+     *
+     * If the data is available 'flags' must contain
+     * LOC_GNSS_CLOCK_HAS_DRIFT_UNCERTAINTY. If GPS has computed a position fix this
+     * field is mandatory and must be populated.
+     */
+    double drift_uncertainty_nsps;
+
+    /**
+     * When there are any discontinuities in the HW clock, this field is
+     * mandatory.
+     *
+     * A "discontinuity" is meant to cover the case of a switch from one source
+     * of clock to another.  A single free-running crystal oscillator (XO)
+     * should generally not have any discontinuities, and this can be set and
+     * left at 0.
+     *
+     * If, however, the time_ns value (HW clock) is derived from a composite of
+     * sources, that is not as smooth as a typical XO, or is otherwise stopped &
+     * restarted, then this value shall be incremented each time a discontinuity
+     * occurs.  (E.g. this value may start at zero at device boot-up and
+     * increment each time there is a change in clock continuity. In the
+     * unlikely event that this value reaches full scale, rollover (not
+     * clamping) is required, such that this value continues to change, during
+     * subsequent discontinuity events.)
+     *
+     * While this number stays the same, between LocGnssClock reports, it can be
+     * safely assumed that the time_ns value has been running continuously, e.g.
+     * derived from a single, high quality clock (XO like, or better, that's
+     * typically used during continuous GNSS signal sampling.)
+     *
+     * It is expected, esp. during periods where there are few GNSS signals
+     * available, that the HW clock be discontinuity-free as long as possible,
+     * as this avoids the need to use (waste) a GNSS measurement to fully
+     * re-solve for the GPS clock bias and drift, when using the accompanying
+     * measurements, from consecutive LocGnssData reports.
+     */
+    uint32_t hw_clock_discontinuity_count;
+
+} LocGnssClock;
+
+/**
+ * Legacy struct to represent a GPS Measurement, it contains raw and computed
+ * information.
+ * Deprecated, to be removed in the next Android release.
+ * Use LocGnssMeasurement instead.
+ */
+typedef struct {
+    /** set to sizeof(LocGpsMeasurement) */
+    size_t size;
+    LocGpsMeasurementFlags flags;
+    int8_t prn;
+    double time_offset_ns;
+    LocGpsMeasurementState state;
+    int64_t received_gps_tow_ns;
+    int64_t received_gps_tow_uncertainty_ns;
+    double c_n0_dbhz;
+    double pseudorange_rate_mps;
+    double pseudorange_rate_uncertainty_mps;
+    LocGpsAccumulatedDeltaRangeState accumulated_delta_range_state;
+    double accumulated_delta_range_m;
+    double accumulated_delta_range_uncertainty_m;
+    double pseudorange_m;
+    double pseudorange_uncertainty_m;
+    double code_phase_chips;
+    double code_phase_uncertainty_chips;
+    float carrier_frequency_hz;
+    int64_t carrier_cycles;
+    double carrier_phase;
+    double carrier_phase_uncertainty;
+    LocGpsLossOfLock loss_of_lock;
+    int32_t bit_number;
+    int16_t time_from_last_bit_ms;
+    double doppler_shift_hz;
+    double doppler_shift_uncertainty_hz;
+    LocGpsMultipathIndicator multipath_indicator;
+    double snr_db;
+    double elevation_deg;
+    double elevation_uncertainty_deg;
+    double azimuth_deg;
+    double azimuth_uncertainty_deg;
+    bool used_in_fix;
+} LocGpsMeasurement;
+
+/**
+ * Represents a GNSS Measurement, it contains raw and computed information.
+ *
+ * Independence - All signal measurement information (e.g. sv_time,
+ * pseudorange_rate, multipath_indicator) reported in this struct should be
+ * based on GNSS signal measurements only. You may not synthesize measurements
+ * by calculating or reporting expected measurements based on known or estimated
+ * position, velocity, or time.
+ */
+typedef struct {
+    /** set to sizeof(LocGnssMeasurement) */
+    size_t size;
+
+    /** A set of flags indicating the validity of the fields in this data structure. */
+    LocGnssMeasurementFlags flags;
+
+    /**
+     * Satellite vehicle ID number, as defined in LocGnssSvInfo::svid
+     * This is a mandatory value.
+     */
+    int16_t svid;
+
+    /**
+     * Defines the constellation of the given SV. Value should be one of those
+     * LOC_GNSS_CONSTELLATION_* constants
+     */
+    LocGnssConstellationType constellation;
+
+    /**
+     * Time offset at which the measurement was taken in nanoseconds.
+     * The reference receiver's time is specified by LocGpsData::clock::time_ns and should be
+     * interpreted in the same way as indicated by LocGpsClock::type.
+     *
+     * The sign of time_offset_ns is given by the following equation:
+     *      measurement time = LocGpsClock::time_ns + time_offset_ns
+     *
+     * It provides an individual time-stamp for the measurement, and allows sub-nanosecond accuracy.
+     * This is a mandatory value.
+     */
+    double time_offset_ns;
+
+    /**
+     * Per satellite sync state. It represents the current sync state for the associated satellite.
+     * Based on the sync state, the 'received GPS tow' field should be interpreted accordingly.
+     *
+     * This is a mandatory value.
+     */
+    LocGnssMeasurementState state;
+
+    /**
+     * The received GNSS Time-of-Week at the measurement time, in nanoseconds.
+     * Ensure that this field is independent (see comment at top of
+     * LocGnssMeasurement struct.)
+     *
+     * For GPS & QZSS, this is:
+     *   Received GPS Time-of-Week at the measurement time, in nanoseconds.
+     *   The value is relative to the beginning of the current GPS week.
+     *
+     *   Given the highest sync state that can be achieved, per each satellite, valid range
+     *   for this field can be:
+     *     Searching       : [ 0       ]   : LOC_GNSS_MEASUREMENT_STATE_UNKNOWN
+     *     C/A code lock   : [ 0   1ms ]   : LOC_GNSS_MEASUREMENT_STATE_CODE_LOCK is set
+     *     Bit sync        : [ 0  20ms ]   : LOC_GNSS_MEASUREMENT_STATE_BIT_SYNC is set
+     *     Subframe sync   : [ 0    6s ]   : LOC_GNSS_MEASUREMENT_STATE_SUBFRAME_SYNC is set
+     *     TOW decoded     : [ 0 1week ]   : LOC_GNSS_MEASUREMENT_STATE_TOW_DECODED is set
+     *
+     *   Note well: if there is any ambiguity in integer millisecond,
+     *   LOC_GNSS_MEASUREMENT_STATE_MSEC_AMBIGUOUS should be set accordingly, in the 'state' field.
+     *
+     *   This value must be populated if 'state' != LOC_GNSS_MEASUREMENT_STATE_UNKNOWN.
+     *
+     * For Glonass, this is:
+     *   Received Glonass time of day, at the measurement time in nanoseconds.
+     *
+     *   Given the highest sync state that can be achieved, per each satellite, valid range for
+     *   this field can be:
+     *     Searching       : [ 0       ]   : LOC_GNSS_MEASUREMENT_STATE_UNKNOWN
+     *     C/A code lock   : [ 0   1ms ]   : LOC_GNSS_MEASUREMENT_STATE_CODE_LOCK is set
+     *     Symbol sync     : [ 0  10ms ]   : LOC_GNSS_MEASUREMENT_STATE_SYMBOL_SYNC is set
+     *     Bit sync        : [ 0  20ms ]   : LOC_GNSS_MEASUREMENT_STATE_BIT_SYNC is set
+     *     String sync     : [ 0    2s ]   : LOC_GNSS_MEASUREMENT_STATE_GLO_STRING_SYNC is set
+     *     Time of day     : [ 0  1day ]   : LOC_GNSS_MEASUREMENT_STATE_GLO_TOD_DECODED is set
+     *
+     * For Beidou, this is:
+     *   Received Beidou time of week, at the measurement time in nanoseconds.
+     *
+     *   Given the highest sync state that can be achieved, per each satellite, valid range for
+     *   this field can be:
+     *     Searching    : [ 0       ] : LOC_GNSS_MEASUREMENT_STATE_UNKNOWN
+     *     C/A code lock: [ 0   1ms ] : LOC_GNSS_MEASUREMENT_STATE_CODE_LOCK is set
+     *     Bit sync (D2): [ 0   2ms ] : LOC_GNSS_MEASUREMENT_STATE_BDS_D2_BIT_SYNC is set
+     *     Bit sync (D1): [ 0  20ms ] : LOC_GNSS_MEASUREMENT_STATE_BIT_SYNC is set
+     *     Subframe (D2): [ 0  0.6s ] : LOC_GNSS_MEASUREMENT_STATE_BDS_D2_SUBFRAME_SYNC is set
+     *     Subframe (D1): [ 0    6s ] : LOC_GNSS_MEASUREMENT_STATE_SUBFRAME_SYNC is set
+     *     Time of week : [ 0 1week ] : LOC_GNSS_MEASUREMENT_STATE_TOW_DECODED is set
+     *
+     * For Galileo, this is:
+     *   Received Galileo time of week, at the measurement time in nanoseconds.
+     *
+     *     E1BC code lock   : [ 0   4ms ]   : LOC_GNSS_MEASUREMENT_STATE_GAL_E1BC_CODE_LOCK is set
+     *     E1C 2nd code lock: [ 0 100ms ]   :
+     *     LOC_GNSS_MEASUREMENT_STATE_GAL_E1C_2ND_CODE_LOCK is set
+     *
+     *     E1B page    : [ 0    2s ] : LOC_GNSS_MEASUREMENT_STATE_GAL_E1B_PAGE_SYNC is set
+     *     Time of week: [ 0 1week ] : LOC_GNSS_MEASUREMENT_STATE_TOW_DECODED is set
+     *
+     * For SBAS, this is:
+     *   Received SBAS time, at the measurement time in nanoseconds.
+     *
+     *   Given the highest sync state that can be achieved, per each satellite,
+     *   valid range for this field can be:
+     *     Searching    : [ 0     ] : LOC_GNSS_MEASUREMENT_STATE_UNKNOWN
+     *     C/A code lock: [ 0 1ms ] : LOC_GNSS_MEASUREMENT_STATE_CODE_LOCK is set
+     *     Symbol sync  : [ 0 2ms ] : LOC_GNSS_MEASUREMENT_STATE_SYMBOL_SYNC is set
+     *     Message      : [ 0  1s ] : LOC_GNSS_MEASUREMENT_STATE_SBAS_SYNC is set
+    */
+    int64_t received_sv_time_in_ns;
+
+    /**
+     * 1-Sigma uncertainty of the Received GPS Time-of-Week in nanoseconds.
+     *
+     * This value must be populated if 'state' != LOC_GPS_MEASUREMENT_STATE_UNKNOWN.
+     */
+    int64_t received_sv_time_uncertainty_in_ns;
+
+    /**
+     * Carrier-to-noise density in dB-Hz, typically in the range [0, 63].
+     * It contains the measured C/N0 value for the signal at the antenna port.
+     *
+     * This is a mandatory value.
+     */
+    double c_n0_dbhz;
+
+    /**
+     * Pseudorange rate at the timestamp in m/s. The correction of a given
+     * Pseudorange Rate value includes corrections for receiver and satellite
+     * clock frequency errors. Ensure that this field is independent (see
+     * comment at top of LocGnssMeasurement struct.)
+     *
+     * It is mandatory to provide the 'uncorrected' 'pseudorange rate', and provide LocGpsClock's
+     * 'drift' field as well (When providing the uncorrected pseudorange rate, do not apply the
+     * corrections described above.)
+     *
+     * The value includes the 'pseudorange rate uncertainty' in it.
+     * A positive 'uncorrected' value indicates that the SV is moving away from the receiver.
+     *
+     * The sign of the 'uncorrected' 'pseudorange rate' and its relation to the sign of 'doppler
+     * shift' is given by the equation:
+     *      pseudorange rate = -k * doppler shift   (where k is a constant)
+     *
+     * This should be the most accurate pseudorange rate available, based on
+     * fresh signal measurements from this channel.
+     *
+     * It is mandatory that this value be provided at typical carrier phase PRR
+     * quality (few cm/sec per second of uncertainty, or better) - when signals
+     * are sufficiently strong & stable, e.g. signals from a GPS simulator at >=
+     * 35 dB-Hz.
+     */
+    double pseudorange_rate_mps;
+
+    /**
+     * 1-Sigma uncertainty of the pseudorange_rate_mps.
+     * The uncertainty is represented as an absolute (single sided) value.
+     *
+     * This is a mandatory value.
+     */
+    double pseudorange_rate_uncertainty_mps;
+
+    /**
+     * Accumulated delta range's state. It indicates whether ADR is reset or there is a cycle slip
+     * (indicating loss of lock).
+     *
+     * This is a mandatory value.
+     */
+    LocGnssAccumulatedDeltaRangeState accumulated_delta_range_state;
+
+    /**
+     * Accumulated delta range since the last channel reset in meters.
+     * A positive value indicates that the SV is moving away from the receiver.
+     *
+     * The sign of the 'accumulated delta range' and its relation to the sign of 'carrier phase'
+     * is given by the equation:
+     *          accumulated delta range = -k * carrier phase    (where k is a constant)
+     *
+     * This value must be populated if 'accumulated delta range state' != LOC_GPS_ADR_STATE_UNKNOWN.
+     * However, it is expected that the data is only accurate when:
+     *      'accumulated delta range state' == LOC_GPS_ADR_STATE_VALID.
+     */
+    double accumulated_delta_range_m;
+
+    /**
+     * 1-Sigma uncertainty of the accumulated delta range in meters.
+     * This value must be populated if 'accumulated delta range state' != LOC_GPS_ADR_STATE_UNKNOWN.
+     */
+    double accumulated_delta_range_uncertainty_m;
+
+    /**
+     * Carrier frequency at which codes and messages are modulated, it can be L1 or L2.
+     * If the field is not set, the carrier frequency is assumed to be L1.
+     *
+     * If the data is available, 'flags' must contain
+     * LOC_GNSS_MEASUREMENT_HAS_CARRIER_FREQUENCY.
+     */
+    float carrier_frequency_hz;
+
+    /**
+     * The number of full carrier cycles between the satellite and the receiver.
+     * The reference frequency is given by the field 'carrier_frequency_hz'.
+     * Indications of possible cycle slips and resets in the accumulation of
+     * this value can be inferred from the accumulated_delta_range_state flags.
+     *
+     * If the data is available, 'flags' must contain
+     * LOC_GNSS_MEASUREMENT_HAS_CARRIER_CYCLES.
+     */
+    int64_t carrier_cycles;
+
+    /**
+     * The RF phase detected by the receiver, in the range [0.0, 1.0].
+     * This is usually the fractional part of the complete carrier phase measurement.
+     *
+     * The reference frequency is given by the field 'carrier_frequency_hz'.
+     * The value contains the 'carrier-phase uncertainty' in it.
+     *
+     * If the data is available, 'flags' must contain
+     * LOC_GNSS_MEASUREMENT_HAS_CARRIER_PHASE.
+     */
+    double carrier_phase;
+
+    /**
+     * 1-Sigma uncertainty of the carrier-phase.
+     * If the data is available, 'flags' must contain
+     * LOC_GNSS_MEASUREMENT_HAS_CARRIER_PHASE_UNCERTAINTY.
+     */
+    double carrier_phase_uncertainty;
+
+    /**
+     * An enumeration that indicates the 'multipath' state of the event.
+     *
+     * The multipath Indicator is intended to report the presence of overlapping
+     * signals that manifest as distorted correlation peaks.
+     *
+     * - if there is a distorted correlation peak shape, report that multipath
+     *   is LOC_GNSS_MULTIPATH_INDICATOR_PRESENT.
+     * - if there is not a distorted correlation peak shape, report
+     *   LOC_GNSS_MULTIPATH_INDICATOR_NOT_PRESENT
+     * - if signals are too weak to discern this information, report
+     *   LOC_GNSS_MULTIPATH_INDICATOR_UNKNOWN
+     *
+     * Example: when doing the standardized overlapping Multipath Performance
+     * test (3GPP TS 34.171) the Multipath indicator should report
+     * LOC_GNSS_MULTIPATH_INDICATOR_PRESENT for those signals that are tracked, and
+     * contain multipath, and LOC_GNSS_MULTIPATH_INDICATOR_NOT_PRESENT for those
+     * signals that are tracked and do not contain multipath.
+     */
+    LocGnssMultipathIndicator multipath_indicator;
+
+    /**
+     * Signal-to-noise ratio at correlator output in dB.
+     * If the data is available, 'flags' must contain LOC_GNSS_MEASUREMENT_HAS_SNR.
+     * This is the power ratio of the "correlation peak height above the
+     * observed noise floor" to "the noise RMS".
+     */
+    double snr_db;
+} LocGnssMeasurement;
+
+/**
+ * Legacy struct to represents a reading of GPS measurements.
+ * Deprecated, to be removed in the next Android release.
+ * Use LocGnssData instead.
+ */
+typedef struct {
+    /** set to sizeof(LocGpsData) */
+    size_t size;
+    size_t measurement_count;
+    LocGpsMeasurement measurements[LOC_GPS_MAX_MEASUREMENT];
+
+    /** The GPS clock time reading. */
+    LocGpsClock clock;
+} LocGpsData;
+
+/**
+ * Represents a reading of GNSS measurements. For devices where LocGnssSystemInfo's
+ * year_of_hw is set to 2016+, it is mandatory that these be provided, on
+ * request, when the GNSS receiver is searching/tracking signals.
+ *
+ * - Reporting of GPS constellation measurements is mandatory.
+ * - Reporting of all tracked constellations are encouraged.
+ */
+typedef struct {
+    /** set to sizeof(LocGnssData) */
+    size_t size;
+
+    /** Number of measurements. */
+    size_t measurement_count;
+
+    /** The array of measurements. */
+    LocGnssMeasurement measurements[LOC_GNSS_MAX_MEASUREMENT];
+
+    /** The GPS clock time reading. */
+    LocGnssClock clock;
+} LocGnssData;
+
+/**
+ * The legacy callback for to report measurements from the HAL.
+ *
+ * This callback is deprecated, and will be removed in the next release. Use
+ * loc_gnss_measurement_callback() instead.
+ *
+ * Parameters:
+ *    data - A data structure containing the measurements.
+ */
+typedef void (*loc_gps_measurement_callback) (LocGpsData* data);
+
+/**
+ * The callback for to report measurements from the HAL.
+ *
+ * Parameters:
+ *    data - A data structure containing the measurements.
+ */
+typedef void (*loc_gnss_measurement_callback) (LocGnssData* data);
+
+typedef struct {
+    /** set to sizeof(LocGpsMeasurementCallbacks) */
+    size_t size;
+    loc_gps_measurement_callback measurement_callback;
+    loc_gnss_measurement_callback loc_gnss_measurement_callback;
+} LocGpsMeasurementCallbacks;
+
+#define LOC_GPS_MEASUREMENT_OPERATION_SUCCESS          0
+#define LOC_GPS_MEASUREMENT_ERROR_ALREADY_INIT      -100
+#define LOC_GPS_MEASUREMENT_ERROR_GENERIC           -101
+
+/**
+ * Extended interface for GPS Measurements support.
+ */
+typedef struct {
+    /** Set to sizeof(LocGpsMeasurementInterface) */
+    size_t size;
+
+    /**
+     * Initializes the interface and registers the callback routines with the HAL.
+     * After a successful call to 'init' the HAL must begin to provide updates at its own phase.
+     *
+     * Status:
+     *    LOC_GPS_MEASUREMENT_OPERATION_SUCCESS
+     *    LOC_GPS_MEASUREMENT_ERROR_ALREADY_INIT - if a callback has already been registered without a
+     *              corresponding call to 'close'
+     *    LOC_GPS_MEASUREMENT_ERROR_GENERIC - if any other error occurred, it is expected that the HAL
+     *              will not generate any updates upon returning this error code.
+     */
+    int (*init) (LocGpsMeasurementCallbacks* callbacks);
+
+    /**
+     * Stops updates from the HAL, and unregisters the callback routines.
+     * After a call to stop, the previously registered callbacks must be considered invalid by the
+     * HAL.
+     * If stop is invoked without a previous 'init', this function should perform no work.
+     */
+    void (*close) ();
+
+} LocGpsMeasurementInterface;
+
+#if 0
+/**
+ * Legacy struct to represents a GPS navigation message (or a fragment of it).
+ * Deprecated, to be removed in the next Android release.
+ * Use GnssNavigationMessage instead.
+ */
+typedef struct {
+    /** set to sizeof(GpsNavigationMessage) */
+    size_t size;
+    int8_t prn;
+    GpsNavigationMessageType type;
+    NavigationMessageStatus status;
+    int16_t message_id;
+    int16_t submessage_id;
+    size_t data_length;
+    uint8_t* data;
+} GpsNavigationMessage;
+
+/** Represents a GPS navigation message (or a fragment of it). */
+typedef struct {
+    /** set to sizeof(GnssNavigationMessage) */
+    size_t size;
+
+    /**
+     * Satellite vehicle ID number, as defined in LocGnssSvInfo::svid
+     * This is a mandatory value.
+     */
+    int16_t svid;
+
+    /**
+     * The type of message contained in the structure.
+     * This is a mandatory value.
+     */
+    GnssNavigationMessageType type;
+
+    /**
+     * The status of the received navigation message.
+     * No need to send any navigation message that contains words with parity error and cannot be
+     * corrected.
+     */
+    NavigationMessageStatus status;
+
+    /**
+     * Message identifier. It provides an index so the complete Navigation
+     * Message can be assembled.
+     *
+     * - For GPS L1 C/A subframe 4 and 5, this value corresponds to the 'frame
+     *   id' of the navigation message, in the range of 1-25 (Subframe 1, 2, 3
+     *   does not contain a 'frame id' and this value can be set to -1.)
+     *
+     * - For Glonass L1 C/A, this refers to the frame ID, in the range of 1-5.
+     *
+     * - For BeiDou D1, this refers to the frame number in the range of 1-24
+     *
+     * - For Beidou D2, this refers to the frame number, in the range of 1-120
+     *
+     * - For Galileo F/NAV nominal frame structure, this refers to the subframe
+     *   number, in the range of 1-12
+     *
+     * - For Galileo I/NAV nominal frame structure, this refers to the subframe
+     *   number in the range of 1-24
+     */
+    int16_t message_id;
+
+    /**
+     * Sub-message identifier. If required by the message 'type', this value
+     * contains a sub-index within the current message (or frame) that is being
+     * transmitted.
+     *
+     * - For GPS L1 C/A, BeiDou D1 & BeiDou D2, the submessage id corresponds to
+     *   the subframe number of the navigation message, in the range of 1-5.
+     *
+     * - For Glonass L1 C/A, this refers to the String number, in the range from
+     *   1-15
+     *
+     * - For Galileo F/NAV, this refers to the page type in the range 1-6
+     *
+     * - For Galileo I/NAV, this refers to the word type in the range 1-10+
+     */
+    int16_t submessage_id;
+
+    /**
+     * The length of the data (in bytes) contained in the current message.
+     * If this value is different from zero, 'data' must point to an array of the same size.
+     * e.g. for L1 C/A the size of the sub-frame will be 40 bytes (10 words, 30 bits/word).
+     *
+     * This is a mandatory value.
+     */
+    size_t data_length;
+
+    /**
+     * The data of the reported GPS message. The bytes (or words) specified
+     * using big endian format (MSB first).
+     *
+     * - For GPS L1 C/A, Beidou D1 & Beidou D2, each subframe contains 10 30-bit
+     *   words. Each word (30 bits) should be fit into the last 30 bits in a
+     *   4-byte word (skip B31 and B32), with MSB first, for a total of 40
+     *   bytes, covering a time period of 6, 6, and 0.6 seconds, respectively.
+     *
+     * - For Glonass L1 C/A, each string contains 85 data bits, including the
+     *   checksum.  These bits should be fit into 11 bytes, with MSB first (skip
+     *   B86-B88), covering a time period of 2 seconds.
+     *
+     * - For Galileo F/NAV, each word consists of 238-bit (sync & tail symbols
+     *   excluded). Each word should be fit into 30-bytes, with MSB first (skip
+     *   B239, B240), covering a time period of 10 seconds.
+     *
+     * - For Galileo I/NAV, each page contains 2 page parts, even and odd, with
+     *   a total of 2x114 = 228 bits, (sync & tail excluded) that should be fit
+     *   into 29 bytes, with MSB first (skip B229-B232).
+     */
+    uint8_t* data;
+
+} GnssNavigationMessage;
+
+/**
+ * The legacy callback to report an available fragment of a GPS navigation
+ * messages from the HAL.
+ *
+ * This callback is deprecated, and will be removed in the next release. Use
+ * gnss_navigation_message_callback() instead.
+ *
+ * Parameters:
+ *      message - The GPS navigation submessage/subframe representation.
+ */
+typedef void (*gps_navigation_message_callback) (GpsNavigationMessage* message);
+
+/**
+ * The callback to report an available fragment of a GPS navigation messages from the HAL.
+ *
+ * Parameters:
+ *      message - The GPS navigation submessage/subframe representation.
+ */
+typedef void (*gnss_navigation_message_callback) (GnssNavigationMessage* message);
+
+typedef struct {
+    /** set to sizeof(GpsNavigationMessageCallbacks) */
+    size_t size;
+    gps_navigation_message_callback navigation_message_callback;
+    gnss_navigation_message_callback gnss_navigation_message_callback;
+} GpsNavigationMessageCallbacks;
+
+#define GPS_NAVIGATION_MESSAGE_OPERATION_SUCCESS             0
+#define GPS_NAVIGATION_MESSAGE_ERROR_ALREADY_INIT         -100
+#define GPS_NAVIGATION_MESSAGE_ERROR_GENERIC              -101
+
+/**
+ * Extended interface for GPS navigation message reporting support.
+ */
+typedef struct {
+    /** Set to sizeof(GpsNavigationMessageInterface) */
+    size_t size;
+
+    /**
+     * Initializes the interface and registers the callback routines with the HAL.
+     * After a successful call to 'init' the HAL must begin to provide updates as they become
+     * available.
+     *
+     * Status:
+     *      GPS_NAVIGATION_MESSAGE_OPERATION_SUCCESS
+     *      GPS_NAVIGATION_MESSAGE_ERROR_ALREADY_INIT - if a callback has already been registered
+     *              without a corresponding call to 'close'.
+     *      GPS_NAVIGATION_MESSAGE_ERROR_GENERIC - if any other error occurred, it is expected that
+     *              the HAL will not generate any updates upon returning this error code.
+     */
+    int (*init) (GpsNavigationMessageCallbacks* callbacks);
+
+    /**
+     * Stops updates from the HAL, and unregisters the callback routines.
+     * After a call to stop, the previously registered callbacks must be considered invalid by the
+     * HAL.
+     * If stop is invoked without a previous 'init', this function should perform no work.
+     */
+    void (*close) ();
+
+} GpsNavigationMessageInterface;
+#endif
+
+/**
+ * Interface for passing GNSS configuration contents from platform to HAL.
+ */
+typedef struct {
+    /** Set to sizeof(LocGnssConfigurationInterface) */
+    size_t size;
+
+    /**
+     * Deliver GNSS configuration contents to HAL.
+     * Parameters:
+     *     config_data - a pointer to a char array which holds what usually is expected from
+                         file(/vendor/etc/gps.conf), i.e., a sequence of UTF8 strings separated by '\n'.
+     *     length - total number of UTF8 characters in configuraiton data.
+     *
+     * IMPORTANT:
+     *      GPS HAL should expect this function can be called multiple times. And it may be
+     *      called even when GpsLocationProvider is already constructed and enabled. GPS HAL
+     *      should maintain the existing requests for various callback regardless the change
+     *      in configuration data.
+     */
+    void (*configuration_update) (const char* config_data, int32_t length);
+} LocGnssConfigurationInterface;
+
+__END_DECLS
+
+#endif /* LOC_GPS_H */
+
diff --git a/gps/utils/loc_log.cpp b/gps/utils/loc_log.cpp
new file mode 100644
index 0000000..2110683
--- /dev/null
+++ b/gps/utils/loc_log.cpp
@@ -0,0 +1,282 @@
+/* Copyright (c) 2011-2012, 2015, 2020, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#define LOG_NDEBUG 0
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include "log_util.h"
+#include "loc_log.h"
+#include "msg_q.h"
+#include <loc_pla.h>
+#include "LogBuffer.h"
+#include <unordered_map>
+#include <fstream>
+#include <algorithm>
+#include <string>
+#include <cctype>
+#define  BUFFER_SIZE  120
+#define  LOG_TAG_LEVEL_CONF_FILE_PATH "/data/vendor/location/gps.prop"
+
+// Logging Improvements
+const char *loc_logger_boolStr[]={"False","True"};
+const char VOID_RET[]   = "None";
+const char FROM_AFW[]   = "===>";
+const char TO_MODEM[]   = "--->";
+const char FROM_MODEM[] = "<---";
+const char TO_AFW[]     = "<===";
+const char EXIT_TAG[]   = "Exiting";
+const char ENTRY_TAG[]  = "Entering";
+const char EXIT_ERROR_TAG[]  = "Exiting with error";
+
+int build_type_prop = BUILD_TYPE_PROP_NA;
+
+const string gEmptyStr = "";
+const string gUnknownStr = "UNKNOWN";
+/* Logging Mechanism */
+loc_logger_s_type loc_logger;
+
+/* tag base logging control map*/
+static std::unordered_map<std::string, uint8_t> tag_level_map;
+static bool tag_map_inited = false;
+
+/* returns the least signification bit that is set in the mask
+   Param
+      mask -        bit mask.
+      clearTheBit - if true, mask gets modified upon return.
+   returns 0 if mask is 0.
+*/
+uint64_t loc_get_least_bit(uint64_t& mask, bool clearTheBit) {
+    uint64_t bit = 0;
+
+    if (mask > 0) {
+        uint64_t less1 = mask - 1;
+        bit = mask & ~(less1);
+        if (clearTheBit) {
+            mask &= less1;
+        }
+    }
+
+    return bit;
+}
+
+string loc_get_bit_defs(uint64_t mask, const NameValTbl& tbl) {
+    string out;
+    while (mask > 0) {
+        out += loc_get_name_from_tbl(tbl, loc_get_least_bit(mask));
+        if (mask > 0) {
+            out += " | ";
+        }
+    }
+    return out;
+}
+
+DECLARE_TBL(loc_msg_q_status) =
+{
+    NAME_VAL( eMSG_Q_SUCCESS ),
+    NAME_VAL( eMSG_Q_FAILURE_GENERAL ),
+    NAME_VAL( eMSG_Q_INVALID_PARAMETER ),
+    NAME_VAL( eMSG_Q_INVALID_HANDLE ),
+    NAME_VAL( eMSG_Q_UNAVAILABLE_RESOURCE ),
+    NAME_VAL( eMSG_Q_INSUFFICIENT_BUFFER )
+};
+
+/* Find msg_q status name */
+const char* loc_get_msg_q_status(int status)
+{
+   return loc_get_name_from_val(loc_msg_q_status_tbl, (int64_t) status);
+}
+
+//Target names
+DECLARE_TBL(target_name) =
+{
+    NAME_VAL(GNSS_NONE),
+    NAME_VAL(GNSS_MSM),
+    NAME_VAL(GNSS_GSS),
+    NAME_VAL(GNSS_MDM),
+    NAME_VAL(GNSS_AUTO),
+    NAME_VAL(GNSS_UNKNOWN)
+};
+
+/*===========================================================================
+
+FUNCTION loc_get_target_name
+
+DESCRIPTION
+   Returns pointer to a string that contains name of the target
+
+   XX:XX:XX.000\0
+
+RETURN VALUE
+   The target name string
+
+===========================================================================*/
+const char *loc_get_target_name(unsigned int target)
+{
+    int64_t index = 0;
+    static char ret[BUFFER_SIZE];
+
+    snprintf(ret, sizeof(ret), " %s with%s SSC",
+             loc_get_name_from_val(target_name_tbl, getTargetGnssType(target)),
+             ((target & HAS_SSC) == HAS_SSC) ? gEmptyStr.c_str() : "out");
+
+    return ret;
+}
+
+
+/*===========================================================================
+
+FUNCTION loc_get_time
+
+DESCRIPTION
+   Logs a callback event header.
+   The pointer time_string should point to a buffer of at least 13 bytes:
+
+   XX:XX:XX.000\0
+
+RETURN VALUE
+   The time string
+
+===========================================================================*/
+char *loc_get_time(char *time_string, size_t buf_size)
+{
+   struct timeval now;     /* sec and usec     */
+   struct tm now_tm;       /* broken-down time */
+   char hms_string[80];    /* HH:MM:SS         */
+
+   gettimeofday(&now, NULL);
+   localtime_r(&now.tv_sec, &now_tm);
+
+   strftime(hms_string, sizeof hms_string, "%H:%M:%S", &now_tm);
+   snprintf(time_string, buf_size, "%s.%03d", hms_string, (int) (now.tv_usec / 1000));
+
+   return time_string;
+}
+
+/*===========================================================================
+FUNCTION get_timestamp
+
+DESCRIPTION
+   Generates a timestamp using the current system time
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Char pointer to the parameter str
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+char * get_timestamp(char *str, unsigned long buf_size)
+{
+  struct timeval tv;
+  struct timezone tz;
+  int hh, mm, ss;
+  gettimeofday(&tv, &tz);
+  hh = tv.tv_sec/3600%24;
+  mm = (tv.tv_sec%3600)/60;
+  ss = tv.tv_sec%60;
+  snprintf(str, buf_size, "%02d:%02d:%02d.%06ld", hh, mm, ss, tv.tv_usec);
+  return str;
+}
+
+/*===========================================================================
+
+FUNCTION log_buffer_insert
+
+DESCRIPTION
+   Insert a log sentence with specific level to the log buffer.
+
+RETURN VALUE
+   N/A
+
+===========================================================================*/
+void log_buffer_insert(char *str, unsigned long buf_size, int level)
+{
+    timespec tv;
+    clock_gettime(CLOCK_BOOTTIME, &tv);
+    uint64_t elapsedTime = (uint64_t)tv.tv_sec + (uint64_t)tv.tv_nsec/1000000000;
+    string ss = str;
+    loc_util::LogBuffer::getInstance()->append(ss, level, elapsedTime);
+}
+
+void log_tag_level_map_init()
+{
+    if (tag_map_inited) {
+        return;
+    }
+
+    std::string filename = LOG_TAG_LEVEL_CONF_FILE_PATH;
+
+    std::ifstream s(filename);
+    if (!s.is_open()) {
+        ALOGE("cannot open file:%s", LOG_TAG_LEVEL_CONF_FILE_PATH);
+    } else {
+        std::string line;
+        while (std::getline(s, line)) {
+            line.erase(std::remove(line.begin(), line.end(), ' '), line.end());
+            int pos = line.find('=');
+            if (pos <= 0 || pos >= (line.size() - 1)) {
+                ALOGE("wrong format in gps.prop");
+                continue;
+            }
+            std::string tag = line.substr(0, pos);
+            std::string level = line.substr(pos+1, 1);
+            if (!std::isdigit(*(level.begin()))) {
+                ALOGE("wrong format in gps.prop");
+                continue;
+            }
+            tag_level_map[tag] = (uint8_t)std::stoul(level);
+        }
+    }
+    tag_map_inited = true;
+}
+
+int get_tag_log_level(const char* tag)
+{
+    if (!tag_map_inited) {
+        return -1;
+    }
+
+    // in case LOG_TAG isn't defined in a source file, use the global log level
+    if (tag == NULL) {
+        return loc_logger.DEBUG_LEVEL;
+    }
+    int log_level;
+    auto search = tag_level_map.find(std::string(tag));
+    if (tag_level_map.end() != search) {
+        log_level = search->second;
+    } else {
+        log_level = loc_logger.DEBUG_LEVEL;
+    }
+    return log_level;
+}
diff --git a/gps/utils/loc_log.h b/gps/utils/loc_log.h
new file mode 100644
index 0000000..b750932
--- /dev/null
+++ b/gps/utils/loc_log.h
@@ -0,0 +1,122 @@
+/* Copyright (c) 2011-2012, 2015, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef LOC_LOG_H
+#define LOC_LOG_H
+
+#include <ctype.h>
+#include <stdlib.h>
+#include <unordered_map>
+#include <string>
+#include "loc_target.h"
+#include "loc_misc_utils.h"
+
+using std::string;
+using std::unordered_map;
+
+typedef unordered_map<int64_t, string> NameValTbl;
+
+#define NAME_VAL(x) {x, "" #x ""}
+#define DECLARE_TBL(T) static const NameValTbl T##_tbl
+
+extern const string gEmptyStr;
+extern const string gUnknownStr;
+
+#define CHECK_MASK(type, value, mask_var, mask) \
+   (((mask_var) & (mask)) ? (type) (value) : (type) (-1))
+
+#define LOC_TABLE_SIZE(table) (sizeof(table)/sizeof((table)[0]))
+
+#define FIELDVAL_DEC(field) \
+        loc_put_tag_val(#field, to_string(field))
+#define FIELDVAL_DEC_ARR(field) \
+        loc_put_tag_val(#field, \
+                        loc_parenthesize(loc_prim_arr_to_string(field, \
+                                                                sizeof(field)/sizeof(field[0]))))
+#define FIELDVAL_HEX(field) \
+        loc_put_tag_val(#field, to_string_hex(field))
+#define FIELDVAL_HEX_ARR(field) \
+        loc_put_tag_val(#field, \
+                        loc_parenthesize(loc_prim_arr_to_string(field, \
+                                                                sizeof(field)/sizeof(field[0]), \
+                                                                false)))
+#define FIELDVAL_ENUM(field, tbl) \
+        loc_put_tag_val(#field, \
+                        loc_get_name_from_tbl(tbl, field, gUnknownStr))
+#define FIELDVAL_MASK(field, tbl) \
+        loc_put_tag_val(#field, \
+                        to_string_hex((uint64_t)field) + " " + \
+                                loc_parenthesize(loc_get_bit_defs(field, tbl)))
+
+/* get from a table of strings with index */
+/* tbl - map of <int, string> entries
+   key - key to the matching entry
+   defalt - default pointer in case of incorrect parameters
+ */
+inline static const string& loc_get_name_from_tbl(const NameValTbl& tbl, int64_t key,
+                                    const string& defalt = gEmptyStr) {
+    auto item = tbl.find(key);
+    if (item != tbl.end()) {
+        return item->second;
+    } else {
+        return defalt;
+    }
+}
+
+/* puts to string formatted "TAG: VAL" with option ending string, default to newline */
+inline string loc_put_tag_val(const string& tag, const string& val, const string& eol = "\n") {
+    return tag + ": " + val + eol;
+}
+
+inline string loc_parenthesize(const string& str) {
+    return "(" + str + ")";
+}
+
+/* Get names from value */
+inline const char* loc_get_name_from_val(const NameValTbl& table, int64_t value) {
+    return loc_get_name_from_tbl(table, value, gUnknownStr).c_str();
+}
+
+inline const char* log_succ_fail_string(int is_succ) {
+    return is_succ? "successful" : "failed";
+}
+
+/* prints mask into a string with bit definitions from tbl */
+/* mask - bit mask, to be expanded into " BIT_NAMEx | BIT_NAMEy ... "
+   tbl - a table with defs for each bit, defined as <bit, name> entries
+         {{bit0, "BIT0_NAME"}, {bit1, "BIT1_NAME"}, .... {bitn, "BITn_NAME"} }
+   entries - number of strings in the table
+ */
+string loc_get_bit_defs(uint64_t mask, const NameValTbl& tbl);
+uint64_t loc_get_least_bit(uint64_t& mask, bool clearThebit = true);
+const char* loc_get_msg_q_status(int status);
+const char* loc_get_target_name(unsigned int target);
+char *loc_get_time(char *time_string, size_t buf_size);
+
+#endif /* LOC_LOG_H */
diff --git a/gps/utils/loc_misc_utils.cpp b/gps/utils/loc_misc_utils.cpp
new file mode 100644
index 0000000..fbcaef4
--- /dev/null
+++ b/gps/utils/loc_misc_utils.cpp
@@ -0,0 +1,351 @@
+/* Copyright (c) 2014, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#define LOG_NDEBUG 0
+#define LOG_TAG "LocSvc_misc_utils"
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include <dlfcn.h>
+#include <math.h>
+#include <log_util.h>
+#include <loc_misc_utils.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <inttypes.h>
+
+#ifndef MSEC_IN_ONE_SEC
+#define MSEC_IN_ONE_SEC 1000ULL
+#endif
+#define GET_MSEC_FROM_TS(ts) ((ts.tv_sec * MSEC_IN_ONE_SEC) + (ts.tv_nsec + 500000)/1000000)
+
+int loc_util_split_string(char *raw_string, char **split_strings_ptr,
+                          int max_num_substrings, char delimiter)
+{
+    int raw_string_index=0;
+    int num_split_strings=0;
+    unsigned char end_string=0;
+    int raw_string_length=0;
+
+    if(!raw_string || !split_strings_ptr) {
+        LOC_LOGE("%s:%d]: NULL parameters", __func__, __LINE__);
+        num_split_strings = -1;
+        goto err;
+    }
+    LOC_LOGD("%s:%d]: raw string: %s\n", __func__, __LINE__, raw_string);
+    raw_string_length = strlen(raw_string) + 1;
+    split_strings_ptr[num_split_strings] = &raw_string[raw_string_index];
+    for(raw_string_index=0; raw_string_index < raw_string_length; raw_string_index++) {
+        if(raw_string[raw_string_index] == '\0')
+            end_string=1;
+        if((raw_string[raw_string_index] == delimiter) || end_string) {
+            raw_string[raw_string_index] = '\0';
+            if (num_split_strings < max_num_substrings) {
+                LOC_LOGD("%s:%d]: split string: %s\n",
+                         __func__, __LINE__, split_strings_ptr[num_split_strings]);
+            }
+            num_split_strings++;
+            if(((raw_string_index + 1) < raw_string_length) &&
+               (num_split_strings < max_num_substrings)) {
+                split_strings_ptr[num_split_strings] = &raw_string[raw_string_index+1];
+            }
+            else {
+                break;
+            }
+        }
+        if(end_string)
+            break;
+    }
+err:
+    LOC_LOGD("%s:%d]: num_split_strings: %d\n", __func__, __LINE__, num_split_strings);
+    return num_split_strings;
+}
+
+void loc_util_trim_space(char *org_string)
+{
+    char *scan_ptr, *write_ptr;
+    char *first_nonspace = NULL, *last_nonspace = NULL;
+
+    if(org_string == NULL) {
+        LOC_LOGE("%s:%d]: NULL parameter", __func__, __LINE__);
+        goto err;
+    }
+
+    scan_ptr = write_ptr = org_string;
+
+    while (*scan_ptr) {
+        //Find the first non-space character
+        if ( !isspace(*scan_ptr) && first_nonspace == NULL) {
+            first_nonspace = scan_ptr;
+        }
+        //Once the first non-space character is found in the
+        //above check, keep shifting the characters to the left
+        //to replace the spaces
+        if (first_nonspace != NULL) {
+            *(write_ptr++) = *scan_ptr;
+            //Keep track of which was the last non-space character
+            //encountered
+            //last_nonspace will not be updated in the case where
+            //the string ends with spaces
+            if ( !isspace(*scan_ptr)) {
+                last_nonspace = write_ptr;
+            }
+        }
+        scan_ptr++;
+    }
+    //Add NULL terminator after the last non-space character
+    if (last_nonspace) { *last_nonspace = '\0'; }
+err:
+    return;
+}
+
+inline void logDlError(const char* failedCall) {
+    const char * err = dlerror();
+    LOC_LOGe("%s error: %s", failedCall, (nullptr == err) ? "unknown" : err);
+}
+
+void* dlGetSymFromLib(void*& libHandle, const char* libName, const char* symName)
+{
+    void* sym = nullptr;
+    if ((nullptr != libHandle || nullptr != libName) && nullptr != symName) {
+        if (nullptr == libHandle) {
+            libHandle = dlopen(libName, RTLD_NOW);
+            if (nullptr == libHandle) {
+                logDlError("dlopen");
+            }
+        }
+        // NOT else, as libHandle gets assigned 5 line above
+        if (nullptr != libHandle) {
+            sym = dlsym(libHandle, symName);
+            if (nullptr == sym) {
+                logDlError("dlsym");
+            }
+        }
+    } else {
+        LOC_LOGe("Either libHandle (%p) or libName (%p) must not be null; "
+                 "symName (%p) can not be null.", libHandle, libName, symName);
+    }
+
+    return sym;
+}
+
+uint64_t getQTimerTickCount()
+{
+    uint64_t qTimerCount = 0;
+#if __aarch64__
+    asm volatile("mrs %0, cntvct_el0" : "=r" (qTimerCount));
+#elif defined (__i386__) || defined (__x86_64__)
+    /* Qtimer not supported in x86 architecture */
+    qTimerCount = 0;
+#else
+    asm volatile("mrrc p15, 1, %Q0, %R0, c14" : "=r" (qTimerCount));
+#endif
+
+    return qTimerCount;
+}
+
+uint64_t getQTimerDeltaNanos()
+{
+    char qtimer_val_string[100];
+    char *temp;
+    uint64_t local_qtimer = 0, remote_qtimer = 0;
+    int mdm_fd = -1, wlan_fd = -1, ret = 0;
+    uint64_t delta = 0;
+
+    memset(qtimer_val_string, '\0', sizeof(qtimer_val_string));
+
+    char devNode[] = "/sys/bus/mhi/devices/0306_00.01.00/time_us";
+    for (; devNode[27] < 3 && mdm_fd < 0; devNode[27]++) {
+        mdm_fd = ::open(devNode, O_RDONLY);
+        if (mdm_fd < 0) {
+            LOC_LOGe("MDM open file: %s error: %s", devNode, strerror(errno));
+        }
+    }
+    if (mdm_fd > 0) {
+        ret = read(mdm_fd, qtimer_val_string, sizeof(qtimer_val_string)-1);
+        ::close(mdm_fd);
+        if (ret < 0) {
+            LOC_LOGe("MDM read time_us file error: %s", strerror(errno));
+        } else {
+            temp = qtimer_val_string;
+            temp = strchr(temp, ':');
+            temp = temp + 2;
+            local_qtimer = atoll(temp);
+
+            temp = strchr(temp, ':');
+            temp = temp + 2;
+            remote_qtimer = atoll(temp);
+
+            if (local_qtimer >= remote_qtimer) {
+                delta = (local_qtimer - remote_qtimer) * 1000;
+            }
+            LOC_LOGv("qtimer values in microseconds: local:%" PRIi64 " remote:%" PRIi64 ""
+                     " delta in nanoseconds:%" PRIi64 "",
+                     local_qtimer, remote_qtimer, delta);
+        }
+    }
+    return delta;
+}
+
+uint64_t getQTimerFreq()
+{
+#if __aarch64__
+    uint64_t val = 0;
+    asm volatile("mrs %0, cntfrq_el0" : "=r" (val));
+#elif defined (__i386__) || defined (__x86_64__)
+    /* Qtimer not supported in x86 architecture */
+    uint64_t val = 0;
+#else
+    uint32_t val = 0;
+    asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (val));
+#endif
+    return val;
+}
+
+uint64_t getBootTimeMilliSec()
+{
+    struct timespec curTs;
+    clock_gettime(CLOCK_BOOTTIME, &curTs);
+    return (uint64_t)GET_MSEC_FROM_TS(curTs);
+}
+
+// Used for convert position/velocity from GSNS antenna based to VRP based
+void Matrix_MxV(float a[3][3],  float b[3], float c[3]) {
+    int i, j;
+
+    for (i=0; i<3; i++) {
+        c[i] = 0.0f;
+        for (j=0; j<3; j++)
+            c[i] += a[i][j] * b[j];
+    }
+}
+
+// Used for convert position/velocity from GNSS antenna based to VRP based
+void Matrix_Skew(float a[3], float c[3][3]) {
+    c[0][0] = 0.0f;
+    c[0][1] = -a[2];
+    c[0][2] = a[1];
+    c[1][0] = a[2];
+    c[1][1] = 0.0f;
+    c[1][2] = -a[0];
+    c[2][0] = -a[1];
+    c[2][1] = a[0];
+    c[2][2] = 0.0f;
+}
+
+// Used for convert position/velocity from GNSS antenna based to VRP based
+void Euler2Dcm(float euler[3], float dcm[3][3]) {
+    float cr = 0.0, sr = 0.0, cp = 0.0, sp = 0.0, ch = 0.0, sh = 0.0;
+
+    cr = cosf(euler[0]);
+    sr = sinf(euler[0]);
+    cp = cosf(euler[1]);
+    sp = sinf(euler[1]);
+    ch = cosf(euler[2]);
+    sh = sinf(euler[2]);
+
+    dcm[0][0] = cp * ch;
+    dcm[0][1] = (sp*sr*ch) - (cr*sh);
+    dcm[0][2] = (cr*sp*ch) + (sh*sr);
+
+    dcm[1][0] = cp * sh;
+    dcm[1][1] = (sr*sp*sh) + (cr*ch);
+    dcm[1][2] = (cr*sp*sh) - (sr*ch);
+
+    dcm[2][0] = -sp;
+    dcm[2][1] = sr * cp;
+    dcm[2][2] = cr * cp;
+}
+
+// Used for convert position from GSNS based to VRP based
+// The converted position will be stored in the llaInfo parameter.
+#define A6DOF_WGS_A (6378137.0f)
+#define A6DOF_WGS_B (6335439.0f)
+#define A6DOF_WGS_E2 (0.00669437999014f)
+void loc_convert_lla_gnss_to_vrp(double lla[3], float rollPitchYaw[3],
+                                 float leverArm[3]) {
+    LOC_LOGv("lla: %f, %f, %f, lever arm: %f %f %f, "
+             "rollpitchyaw: %f %f %f",
+             lla[0], lla[1], lla[2],
+             leverArm[0], leverArm[1], leverArm[2],
+             rollPitchYaw[0], rollPitchYaw[1], rollPitchYaw[2]);
+
+    float cnb[3][3];
+    memset(cnb, 0, sizeof(cnb));
+    Euler2Dcm(rollPitchYaw, cnb);
+
+    float sl = sin(lla[0]);
+    float cl = cos(lla[0]);
+    float sf = 1.0f / (1.0f - A6DOF_WGS_E2 * sl* sl);
+    float sfr = sqrtf(sf);
+
+    float rn = A6DOF_WGS_B * sf * sfr + lla[2];
+    float re = A6DOF_WGS_A * sfr + lla[2];
+
+    float deltaNEU[3];
+
+    // gps_pos_lla = imu_pos_lla + Cbn*la_b .* [1/geo.Rn; 1/(geo.Re*geo.cL); -1];
+    Matrix_MxV(cnb, leverArm, deltaNEU);
+
+    // NED to lla conversion
+    lla[0] = lla[0] + deltaNEU[0] / rn;
+    lla[1] = lla[1] + deltaNEU[1] / (re * cl);
+    lla[2] = lla[2] + deltaNEU[2];
+}
+
+// Used for convert velocity from GSNS based to VRP based
+// The converted velocity will be stored in the enuVelocity parameter.
+void loc_convert_velocity_gnss_to_vrp(float enuVelocity[3], float rollPitchYaw[3],
+                                      float rollPitchYawRate[3], float leverArm[3]) {
+
+    LOC_LOGv("enu velocity: %f, %f, %f, lever arm: %f %f %f, roll pitch yaw: %f %f %f,"
+             "rollpitchyawRate: %f %f %f",
+             enuVelocity[0], enuVelocity[1], enuVelocity[2],
+             leverArm[0], leverArm[1], leverArm[2],
+             rollPitchYaw[0], rollPitchYaw[1], rollPitchYaw[2],
+             rollPitchYawRate[0], rollPitchYawRate[1], rollPitchYawRate[2]);
+
+    float cnb[3][3];
+    memset(cnb, 0, sizeof(cnb));
+    Euler2Dcm(rollPitchYaw, cnb);
+
+    float skewLA[3][3];
+    memset(skewLA, 0, sizeof(skewLA));
+    Matrix_Skew(leverArm, skewLA);
+
+    float tmp[3];
+    float deltaEnuVelocity[3];
+    memset(tmp, 0, sizeof(tmp));
+    memset(deltaEnuVelocity, 0, sizeof(deltaEnuVelocity));
+    Matrix_MxV(skewLA, rollPitchYawRate, tmp);
+    Matrix_MxV(cnb, tmp, deltaEnuVelocity);
+
+    enuVelocity[0] = enuVelocity[0] - deltaEnuVelocity[0];
+    enuVelocity[1] = enuVelocity[1] - deltaEnuVelocity[1];
+    enuVelocity[2] = enuVelocity[2] - deltaEnuVelocity[2];
+}
diff --git a/gps/utils/loc_misc_utils.h b/gps/utils/loc_misc_utils.h
new file mode 100644
index 0000000..2335e57
--- /dev/null
+++ b/gps/utils/loc_misc_utils.h
@@ -0,0 +1,321 @@
+/* Copyright (c) 2014, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#ifndef _LOC_MISC_UTILS_H_
+#define _LOC_MISC_UTILS_H_
+#include <stdint.h>
+#include <ios>
+#include <string>
+#include <sstream>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#include <stddef.h>
+#include <stdint.h>
+/*===========================================================================
+FUNCTION loc_split_string
+
+DESCRIPTION:
+    This function is used to split a delimiter separated string into
+    sub-strings. This function does not allocate new memory to store the split
+    strings. Instead, it places '\0' in places of delimiters and assings the
+    starting address of the substring within the raw string as the string address
+    The input raw_string no longer remains to be a collection of sub-strings
+    after this function is executed.
+    Please make a copy of the input string before calling this function if
+    necessary
+
+PARAMETERS:
+    char *raw_string: is the original string with delimiter separated substrings
+    char **split_strings_ptr: is the arraw of pointers which will hold the addresses
+                              of individual substrings
+    int max_num_substrings: is the maximum number of substrings that are expected
+                            by the caller. The array of pointers in the above parameter
+                            is usually this long
+    char delimiter: is the delimiter that separates the substrings. Examples: ' ', ';'
+
+DEPENDENCIES
+    N/A
+
+RETURN VALUE
+    int Number of split strings
+
+SIDE EFFECTS
+    The input raw_string no longer remains a delimiter separated single string.
+
+EXAMPLE
+    delimiter = ' ' //space
+    raw_string = "hello new user" //delimiter is space ' '
+    addresses  =  0123456789abcd
+    split_strings_ptr[0] = &raw_string[0]; //split_strings_ptr[0] contains "hello"
+    split_strings_ptr[1] = &raw_string[6]; //split_strings_ptr[1] contains "new"
+    split_strings_ptr[2] = &raw_string[a]; //split_strings_ptr[2] contains "user"
+
+===========================================================================*/
+int loc_util_split_string(char *raw_string, char **split_strings_ptr, int max_num_substrings,
+                     char delimiter);
+
+/*===========================================================================
+FUNCTION trim_space
+
+DESCRIPTION
+   Removes leading and trailing spaces of the string
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   None
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+void loc_util_trim_space(char *org_string);
+
+/*===========================================================================
+FUNCTION dlGetSymFromLib
+
+DESCRIPTION
+   Handy function to get a pointer to a symbol from a library.
+
+   If libHandle is not null, it will be used as the handle to the library. In
+   that case libName wll not be used;
+   libHandle is an in / out parameter.
+   If libHandle is null, libName will be used to dlopen.
+   Either libHandle or libName must not be nullptr.
+   symName must not be null.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   pointer to symName. Could be nullptr if
+       Parameters are incorrect; or
+       libName can not be opened; or
+       symName can not be found.
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+void* dlGetSymFromLib(void*& libHandle, const char* libName, const char* symName);
+
+/*===========================================================================
+FUNCTION getQTimerTickCount
+
+DESCRIPTION
+   This function is used to read the QTimer ticks count. This value is globally maintained and
+   must be the same across all processors on a target.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+    uint64_t QTimer tick count
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+uint64_t getQTimerTickCount();
+
+/*===========================================================================
+FUNCTION getQTimerDeltaNanos
+
+DESCRIPTION
+This function is used to read the the difference in nanoseconds between
+Qtimer on AP side and Qtimer on MP side for dual-SoC architectures such as Kona
+
+DEPENDENCIES
+N/A
+
+RETURN VALUE
+uint64_t QTimer difference in nanoseconds
+
+SIDE EFFECTS
+N/A
+===========================================================================*/
+uint64_t getQTimerDeltaNanos();
+
+/*===========================================================================
+FUNCTION getQTimerFreq
+
+DESCRIPTION
+   This function is used to read the QTimer frequency in hz. This value is globally maintained and
+   must be the same across all processors on a target.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+    uint64_t QTimer frequency
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+uint64_t getQTimerFreq();
+
+/*===========================================================================
+FUNCTION getBootTimeMilliSec
+
+DESCRIPTION
+   This function is used to get boot time in milliseconds.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+    uint64_t boot time in milliseconds
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+uint64_t getBootTimeMilliSec();
+
+#ifdef __cplusplus
+}
+#endif
+
+using std::hex;
+using std::string;
+using std::stringstream;
+
+/*===========================================================================
+FUNCTION to_string_hex
+
+DESCRIPTION
+   This function works similar to std::to_string, but puts only in hex format.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   string, of input val in hex format
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+template <typename T>
+string to_string_hex(T val) {
+    stringstream ss;
+    if (val < 0) {
+        val = -val;
+        ss << "-";
+    }
+    ss << hex << "0x" << val;
+    return ss.str();
+}
+
+/*===========================================================================
+FUNCTION loc_prim_arr_to_string
+
+DESCRIPTION
+   This function puts out primitive array in DEC or EHX format.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+    string, space separated string of values in the input array, either
+            in decimal or hex format, depending on the value of decIfTrue
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+template <typename T>
+static string loc_prim_arr_to_string(T* arr, uint32_t size, bool decIfTrue = true) {
+    stringstream ss;
+    for (uint32_t i = 0; i < size; i++) {
+        ss << (decIfTrue ? to_string(arr[i]) : to_string_hex(arr[i]));
+        if (i != size - 1) {
+            ss << " ";
+        }
+    }
+    return ss.str();
+}
+
+/*===========================================================================
+FUNCTION qTimerTicksToNanos
+
+DESCRIPTION
+    Transform from ticks to nanoseconds, clock is 19.2 MHz
+    so the formula would be qtimer(ns) = (ticks * 1000000000) / 19200000
+    or simplified qtimer(ns) = (ticks * 10000) / 192.
+
+DEPENDENCIES
+    N/A
+
+RETURN VALUE
+    Qtimer value in nanoseconds
+
+SIDE EFFECTS
+    N/A
+===========================================================================*/
+inline uint64_t qTimerTicksToNanos(double qTimer) {
+    return (uint64_t((qTimer * double(10000ull)) / (double)192ull));
+}
+
+/*===========================================================================
+FUNCTION loc_convert_lla_gnss_to_vrp
+
+DESCRIPTION
+   This function converts lat/long/altitude from GNSS antenna based
+   to vehicle reference point based.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+    The converted lat/long/altitude will be stored in the parameter of llaInfo.
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+void loc_convert_lla_gnss_to_vrp(double lla[3], float rollPitchYaw[3],
+                                 float leverArm[3]);
+
+/*===========================================================================
+FUNCTION loc_convert_velocity_gnss_to_vrp
+
+DESCRIPTION
+   This function converts east/north/up velocity from GNSS antenna based
+   to vehicle reference point based.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+    The converted east/north/up velocity will be stored in the parameter of
+    enuVelocity.
+
+SIDE EFFECTS
+   N/A
+===========================================================================*/
+void loc_convert_velocity_gnss_to_vrp(float enuVelocity[3], float rollPitchYaw[3],
+                                      float rollPitchYawRate[3], float leverArm[3]);
+
+#endif //_LOC_MISC_UTILS_H_
diff --git a/gps/utils/loc_nmea.cpp b/gps/utils/loc_nmea.cpp
new file mode 100644
index 0000000..6b5e60e
--- /dev/null
+++ b/gps/utils/loc_nmea.cpp
@@ -0,0 +1,2347 @@
+/* Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#define LOG_NDEBUG 0
+#define LOG_TAG "LocSvc_nmea"
+#include <loc_nmea.h>
+#include <math.h>
+#include <log_util.h>
+#include <loc_pla.h>
+#include <loc_cfg.h>
+
+#define GLONASS_SV_ID_OFFSET 64
+#define SBAS_SV_ID_OFFSET    (87)
+#define QZSS_SV_ID_OFFSET    (192)
+#define BDS_SV_ID_OFFSET     (200)
+#define GALILEO_SV_ID_OFFSET (300)
+#define NAVIC_SV_ID_OFFSET   (400)
+#define MAX_SV_COUNT_SUPPORTED_IN_ONE_CONSTELLATION  64
+#define MAX_SATELLITES_IN_USE 12
+#define MSEC_IN_ONE_WEEK      604800000ULL
+#define UTC_GPS_OFFSET_MSECS  315964800000ULL
+#define MAX_TAG_BLOCK_GROUP_CODE  (99999)
+
+// GNSS system id according to NMEA spec
+#define SYSTEM_ID_GPS          1
+#define SYSTEM_ID_GLONASS      2
+#define SYSTEM_ID_GALILEO      3
+#define SYSTEM_ID_BDS          4
+#define SYSTEM_ID_QZSS         5
+#define SYSTEM_ID_NAVIC        6
+
+//GNSS signal id according to NMEA spec
+#define SIGNAL_ID_ALL_SIGNALS  0
+#define SIGNAL_ID_GPS_L1CA     1
+#define SIGNAL_ID_GPS_L1P      2
+#define SIGNAL_ID_GPS_L1M      3
+#define SIGNAL_ID_GPS_L2P      4
+#define SIGNAL_ID_GPS_L2CM     5
+#define SIGNAL_ID_GPS_L2CL     6
+#define SIGNAL_ID_GPS_L5I      7
+#define SIGNAL_ID_GPS_L5Q      8
+
+
+#define SIGNAL_ID_GLO_G1CA     1
+#define SIGNAL_ID_GLO_G1P      2
+#define SIGNAL_ID_GLO_G2CA     3
+#define SIGNAL_ID_GLO_G2P      4
+
+
+#define SIGNAL_ID_GAL_E5A      1
+#define SIGNAL_ID_GAL_E5B      2
+#define SIGNAL_ID_GAL_E5AB     3
+#define SIGNAL_ID_GAL_E6A      4
+#define SIGNAL_ID_GAL_E6BC     5
+#define SIGNAL_ID_GAL_L1A      6
+#define SIGNAL_ID_GAL_L1BC     7
+
+#define SIGNAL_ID_BDS_B1I      1
+#define SIGNAL_ID_BDS_B1Q      2
+#define SIGNAL_ID_BDS_B1C      3
+#define SIGNAL_ID_BDS_B1A      4
+#define SIGNAL_ID_BDS_B2A      5
+#define SIGNAL_ID_BDS_B2B      6
+#define SIGNAL_ID_BDS_B2AB     7
+#define SIGNAL_ID_BDS_B3I      8
+#define SIGNAL_ID_BDS_B3Q      9
+#define SIGNAL_ID_BDS_B3A      0xA
+#define SIGNAL_ID_BDS_B2I      0xB
+#define SIGNAL_ID_BDS_B2Q      0xC
+
+#define SIGNAL_ID_QZSS_L1CA    1
+#define SIGNAL_ID_QZSS_L1CD    2
+#define SIGNAL_ID_QZSS_L1CP    3
+#define SIGNAL_ID_QZSS_LIS     4
+#define SIGNAL_ID_QZSS_L2CM    5
+#define SIGNAL_ID_QZSS_L2CL    6
+#define SIGNAL_ID_QZSS_L5I     7
+#define SIGNAL_ID_QZSS_L5Q     8
+#define SIGNAL_ID_QZSS_L6D     9
+#define SIGNAL_ID_QZSS_L6E     0xA
+
+#define SIGNAL_ID_NAVIC_L5SPS  1
+#define SIGNAL_ID_NAVIC_SSPS   2
+#define SIGNAL_ID_NAVIC_L5RS   3
+#define SIGNAL_ID_NAVIC_SRS    4
+#define SIGNAL_ID_NAVIC_L1SPS  5
+
+
+typedef struct loc_nmea_sv_meta_s
+{
+    char talker[3];
+    uint32_t svTypeMask;
+    uint64_t mask;
+    uint32_t svCount;
+    uint32_t totalSvUsedCount;
+    uint32_t svIdOffset;
+    uint32_t signalId;
+    uint32_t systemId;
+} loc_nmea_sv_meta;
+
+typedef struct loc_sv_cache_info_s
+{
+    uint64_t gps_used_mask;
+    uint64_t glo_used_mask;
+    uint64_t gal_used_mask;
+    uint64_t qzss_used_mask;
+    uint64_t bds_used_mask;
+    uint64_t navic_used_mask;
+    uint32_t gps_l1_count;
+    uint32_t gps_l2_count;
+    uint32_t gps_l5_count;
+    uint32_t glo_g1_count;
+    uint32_t glo_g2_count;
+    uint32_t gal_e1_count;
+    uint32_t gal_e5_count;
+    uint32_t gal_e5b_count;
+    uint32_t qzss_l1_count;
+    uint32_t qzss_l2_count;
+    uint32_t qzss_l5_count;
+    uint32_t bds_b1i_count;
+    uint32_t bds_b1c_count;
+    uint32_t bds_b2_count;
+    uint32_t navic_l5_count;
+    float hdop;
+    float pdop;
+    float vdop;
+} loc_sv_cache_info;
+
+/*===========================================================================
+FUNCTION    convert_Lla_to_Ecef
+
+DESCRIPTION
+   Convert LLA to ECEF
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   NONE
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static void convert_Lla_to_Ecef(const LocLla& plla, LocEcef& pecef)
+{
+    double r;
+
+    r = MAJA / sqrt(1.0 - ESQR * sin(plla.lat) * sin(plla.lat));
+    pecef.X = (r + plla.alt) * cos(plla.lat) * cos(plla.lon);
+    pecef.Y = (r + plla.alt) * cos(plla.lat) * sin(plla.lon);
+    pecef.Z = (r * OMES + plla.alt) * sin(plla.lat);
+}
+
+/*===========================================================================
+FUNCTION    convert_WGS84_to_PZ90
+
+DESCRIPTION
+   Convert datum from WGS84 to PZ90
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   NONE
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static void convert_WGS84_to_PZ90(const LocEcef& pWGS84, LocEcef& pPZ90)
+{
+    double deltaX     = DatumConstFromWGS84[0];
+    double deltaY     = DatumConstFromWGS84[1];
+    double deltaZ     = DatumConstFromWGS84[2];
+    double deltaScale = DatumConstFromWGS84[3];
+    double rotX       = DatumConstFromWGS84[4];
+    double rotY       = DatumConstFromWGS84[5];
+    double rotZ       = DatumConstFromWGS84[6];
+
+    pPZ90.X = deltaX + deltaScale * (pWGS84.X + rotZ * pWGS84.Y - rotY * pWGS84.Z);
+    pPZ90.Y = deltaY + deltaScale * (pWGS84.Y - rotZ * pWGS84.X + rotX * pWGS84.Z);
+    pPZ90.Z = deltaZ + deltaScale * (pWGS84.Z + rotY * pWGS84.X - rotX * pWGS84.Y);
+}
+
+/*===========================================================================
+FUNCTION    convert_Ecef_to_Lla
+
+DESCRIPTION
+   Convert ECEF to LLA
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   NONE
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static void convert_Ecef_to_Lla(const LocEcef& pecef, LocLla& plla)
+{
+    double p, r;
+    double EcefA = C_PZ90A;
+    double EcefB = C_PZ90B;
+    double Ecef1Mf;
+    double EcefE2;
+    double Mu;
+    double Smu;
+    double Cmu;
+    double Phi;
+    double Sphi;
+    double N;
+
+    p = sqrt(pecef.X * pecef.X + pecef.Y * pecef.Y);
+    r = sqrt(p * p + pecef.Z * pecef.Z);
+    if (r < 1.0) {
+        plla.lat = 1.0;
+        plla.lon = 1.0;
+        plla.alt = 1.0;
+    }
+    Ecef1Mf = 1.0 - (EcefA - EcefB) / EcefA;
+    EcefE2 = 1.0 - (EcefB * EcefB) / (EcefA * EcefA);
+    if (p > 1.0) {
+        Mu = atan2(pecef.Z * (Ecef1Mf + EcefE2 * EcefA / r), p);
+    } else {
+        if (pecef.Z > 0.0) {
+            Mu = M_PI / 2.0;
+        } else {
+            Mu = -M_PI / 2.0;
+        }
+    }
+    Smu = sin(Mu);
+    Cmu = cos(Mu);
+    Phi = atan2(pecef.Z * Ecef1Mf + EcefE2 * EcefA * Smu * Smu * Smu,
+                Ecef1Mf * (p - EcefE2 * EcefA * Cmu * Cmu * Cmu));
+    Sphi = sin(Phi);
+    N = EcefA / sqrt(1.0 - EcefE2 * Sphi * Sphi);
+    plla.alt = p * cos(Phi) + pecef.Z * Sphi - EcefA * EcefA/N;
+    plla.lat = Phi;
+    if ( p > 1.0) {
+        plla.lon = atan2(pecef.Y, pecef.X);
+    } else {
+        plla.lon = 0.0;
+    }
+}
+
+/*===========================================================================
+FUNCTION    convert_signalType_to_signalId
+
+DESCRIPTION
+   convert signalType to signal ID
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   value of signal ID
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static uint32_t convert_signalType_to_signalId(GnssSignalTypeMask signalType)
+{
+    uint32_t signalId = SIGNAL_ID_ALL_SIGNALS;
+
+    switch (signalType) {
+        case GNSS_SIGNAL_GPS_L1CA:
+        case GNSS_SIGNAL_SBAS_L1:
+            signalId = SIGNAL_ID_GPS_L1CA;
+            break;
+        case GNSS_SIGNAL_GPS_L2:
+            signalId = SIGNAL_ID_GPS_L2CL;
+            break;
+        case GNSS_SIGNAL_GPS_L5:
+            signalId = SIGNAL_ID_GPS_L5Q;
+            break;
+        case GNSS_SIGNAL_GLONASS_G1:
+            signalId = SIGNAL_ID_GLO_G1CA;
+            break;
+        case GNSS_SIGNAL_GLONASS_G2:
+            signalId = SIGNAL_ID_GLO_G2CA;
+            break;
+        case GNSS_SIGNAL_GALILEO_E1:
+            signalId = SIGNAL_ID_GAL_L1BC;
+            break;
+        case GNSS_SIGNAL_GALILEO_E5A:
+            signalId = SIGNAL_ID_GAL_E5A;
+            break;
+        case GNSS_SIGNAL_GALILEO_E5B:
+            signalId = SIGNAL_ID_GAL_E5B;
+            break;
+        case GNSS_SIGNAL_QZSS_L1CA:
+            signalId = SIGNAL_ID_QZSS_L1CA;
+            break;
+        case GNSS_SIGNAL_QZSS_L2:
+            signalId = SIGNAL_ID_QZSS_L2CL;
+            break;
+        case GNSS_SIGNAL_QZSS_L5:
+            signalId = SIGNAL_ID_QZSS_L5Q;
+            break;
+        case GNSS_SIGNAL_BEIDOU_B1I:
+            signalId = SIGNAL_ID_BDS_B1I;
+            break;
+        case GNSS_SIGNAL_BEIDOU_B1C:
+            signalId = SIGNAL_ID_BDS_B1C;
+            break;
+        case GNSS_SIGNAL_BEIDOU_B2I:
+            signalId = SIGNAL_ID_BDS_B2I;
+            break;
+        case GNSS_SIGNAL_BEIDOU_B2AI:
+        case GNSS_SIGNAL_BEIDOU_B2AQ:
+            signalId = SIGNAL_ID_BDS_B2A;
+            break;
+        case GNSS_SIGNAL_NAVIC_L5:
+            signalId = SIGNAL_ID_NAVIC_L5SPS;
+            break;
+        default:
+            signalId = SIGNAL_ID_ALL_SIGNALS;
+    }
+
+    return signalId;
+
+}
+
+/*===========================================================================
+FUNCTION    get_sv_count_from_mask
+
+DESCRIPTION
+   get the sv count from bit mask
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   value of sv count
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static uint32_t get_sv_count_from_mask(uint64_t svMask, int totalSvCount)
+{
+    int index = 0;
+    uint32_t svCount = 0;
+
+    if(totalSvCount > MAX_SV_COUNT_SUPPORTED_IN_ONE_CONSTELLATION) {
+        LOC_LOGE("total SV count in this constellation %d exceeded limit %d",
+                 totalSvCount, MAX_SV_COUNT_SUPPORTED_IN_ONE_CONSTELLATION);
+    }
+    for(index = 0; index < totalSvCount; index++) {
+        if(svMask & 0x1)
+            svCount += 1;
+        svMask >>= 1;
+    }
+    return svCount;
+}
+
+/*===========================================================================
+FUNCTION    loc_nmea_sv_meta_init
+
+DESCRIPTION
+   Init loc_nmea_sv_meta passed in
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   Pointer to loc_nmea_sv_meta
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static loc_nmea_sv_meta* loc_nmea_sv_meta_init(loc_nmea_sv_meta& sv_meta,
+                                               loc_sv_cache_info& sv_cache_info,
+                                               GnssSvType svType,
+                                               GnssSignalTypeMask signalType,
+                                               bool needCombine)
+{
+    memset(&sv_meta, 0, sizeof(sv_meta));
+    sv_meta.svTypeMask = (1 << svType);
+
+    switch (svType)
+    {
+        case GNSS_SV_TYPE_GPS:
+            sv_meta.talker[0] = 'G';
+            sv_meta.talker[1] = 'P';
+            sv_meta.mask = sv_cache_info.gps_used_mask;
+            sv_meta.systemId = SYSTEM_ID_GPS;
+            sv_meta.svTypeMask |= (1 << GNSS_SV_TYPE_SBAS);
+            switch (signalType) {
+                case GNSS_SIGNAL_GPS_L1CA:
+                    sv_meta.svCount = sv_cache_info.gps_l1_count;
+                    break;
+                case GNSS_SIGNAL_GPS_L5:
+                    sv_meta.svCount = sv_cache_info.gps_l5_count;
+                    break;
+                case GNSS_SIGNAL_GPS_L2:
+                    sv_meta.svCount = sv_cache_info.gps_l2_count;
+                    break;
+            }
+            break;
+        case GNSS_SV_TYPE_GLONASS:
+            sv_meta.talker[0] = 'G';
+            sv_meta.talker[1] = 'L';
+            sv_meta.mask = sv_cache_info.glo_used_mask;
+            // GLONASS SV ids are from 65-96
+            sv_meta.svIdOffset = GLONASS_SV_ID_OFFSET;
+            sv_meta.systemId = SYSTEM_ID_GLONASS;
+            switch (signalType) {
+                case GNSS_SIGNAL_GLONASS_G1:
+                    sv_meta.svCount = sv_cache_info.glo_g1_count;
+                    break;
+                case GNSS_SIGNAL_GLONASS_G2:
+                    sv_meta.svCount = sv_cache_info.glo_g2_count;
+                    break;
+            }
+            break;
+        case GNSS_SV_TYPE_GALILEO:
+            sv_meta.talker[0] = 'G';
+            sv_meta.talker[1] = 'A';
+            sv_meta.mask = sv_cache_info.gal_used_mask;
+            // GALILEO SV ids are from 301-336, So keep svIdOffset 300
+            sv_meta.svIdOffset = GALILEO_SV_ID_OFFSET;
+            sv_meta.systemId = SYSTEM_ID_GALILEO;
+            switch (signalType) {
+                case GNSS_SIGNAL_GALILEO_E1:
+                    sv_meta.svCount = sv_cache_info.gal_e1_count;
+                    break;
+                case GNSS_SIGNAL_GALILEO_E5A:
+                    sv_meta.svCount = sv_cache_info.gal_e5_count;
+                    break;
+                case GNSS_SIGNAL_GALILEO_E5B:
+                    sv_meta.svCount = sv_cache_info.gal_e5b_count;
+                    break;
+            }
+            break;
+        case GNSS_SV_TYPE_QZSS:
+            sv_meta.talker[0] = 'G';
+            sv_meta.talker[1] = 'Q';
+            sv_meta.mask = sv_cache_info.qzss_used_mask;
+            // QZSS SV ids are from 193-199. So keep svIdOffset 192
+            sv_meta.svIdOffset = QZSS_SV_ID_OFFSET;
+            sv_meta.systemId = SYSTEM_ID_QZSS;
+            switch (signalType) {
+                case GNSS_SIGNAL_QZSS_L1CA:
+                    sv_meta.svCount = sv_cache_info.qzss_l1_count;
+                    break;
+                case GNSS_SIGNAL_QZSS_L2:
+                    sv_meta.svCount = sv_cache_info.qzss_l2_count;
+                    break;
+                case GNSS_SIGNAL_QZSS_L5:
+                    sv_meta.svCount = sv_cache_info.qzss_l5_count;
+                    break;
+            }
+            break;
+        case GNSS_SV_TYPE_BEIDOU:
+            sv_meta.talker[0] = 'G';
+            sv_meta.talker[1] = 'B';
+            sv_meta.mask = sv_cache_info.bds_used_mask;
+            // BDS SV ids are from 201-237. So keep svIdOffset 200
+            sv_meta.svIdOffset = BDS_SV_ID_OFFSET;
+            sv_meta.systemId = SYSTEM_ID_BDS;
+            switch (signalType) {
+                case GNSS_SIGNAL_BEIDOU_B1I:
+                    sv_meta.svCount = sv_cache_info.bds_b1i_count;
+                    break;
+                case GNSS_SIGNAL_BEIDOU_B1C:
+                    sv_meta.svCount = sv_cache_info.bds_b1c_count;
+                    break;
+                case GNSS_SIGNAL_BEIDOU_B2AI:
+                    sv_meta.svCount = sv_cache_info.bds_b2_count;
+                    break;
+            }
+            break;
+        case GNSS_SV_TYPE_NAVIC:
+            sv_meta.talker[0] = 'G';
+            sv_meta.talker[1] = 'I';
+            sv_meta.mask = sv_cache_info.navic_used_mask;
+            // NAVIC SV ids are from 401-414. So keep svIdOffset 400
+            sv_meta.svIdOffset = NAVIC_SV_ID_OFFSET;
+            sv_meta.systemId = SYSTEM_ID_NAVIC;
+            switch (signalType) {
+                case GNSS_SIGNAL_NAVIC_L5:
+                    sv_meta.svCount = sv_cache_info.navic_l5_count;
+                    break;
+            }
+            break;
+        default:
+            LOC_LOGE("NMEA Error unknow constellation type: %d", svType);
+            return NULL;
+    }
+    sv_meta.signalId = convert_signalType_to_signalId(signalType);
+    sv_meta.totalSvUsedCount =
+            get_sv_count_from_mask(sv_cache_info.gps_used_mask,
+                    GPS_SV_PRN_MAX - GPS_SV_PRN_MIN + 1) +
+            get_sv_count_from_mask(sv_cache_info.glo_used_mask,
+                    GLO_SV_PRN_MAX - GLO_SV_PRN_MIN + 1) +
+            get_sv_count_from_mask(sv_cache_info.gal_used_mask,
+                    GAL_SV_PRN_MAX - GAL_SV_PRN_MIN + 1) +
+            get_sv_count_from_mask(sv_cache_info.qzss_used_mask,
+                    QZSS_SV_PRN_MAX - QZSS_SV_PRN_MIN + 1) +
+            get_sv_count_from_mask(sv_cache_info.bds_used_mask,
+                    BDS_SV_PRN_MAX - BDS_SV_PRN_MIN + 1) +
+            get_sv_count_from_mask(sv_cache_info.navic_used_mask,
+                    NAVIC_SV_PRN_MAX - NAVIC_SV_PRN_MIN + 1);
+    if (needCombine &&
+                (sv_cache_info.gps_used_mask ? 1 : 0) +
+                (sv_cache_info.glo_used_mask ? 1 : 0) +
+                (sv_cache_info.gal_used_mask ? 1 : 0) +
+                (sv_cache_info.qzss_used_mask ? 1 : 0) +
+                (sv_cache_info.bds_used_mask ? 1 : 0) +
+                (sv_cache_info.navic_used_mask ? 1 : 0) > 1)
+    {
+        // If GPS, GLONASS, Galileo, QZSS, BDS etc. are combined
+        // to obtain the reported position solution,
+        // talker shall be set to GN, to indicate that
+        // the satellites are used in a combined solution
+        sv_meta.talker[0] = 'G';
+        sv_meta.talker[1] = 'N';
+    }
+    return &sv_meta;
+}
+
+/*===========================================================================
+FUNCTION    loc_nmea_put_checksum
+
+DESCRIPTION
+   Generate NMEA sentences generated based on position report
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   Total length of the nmea sentence
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static int loc_nmea_put_checksum(char *pNmea, int maxSize, bool isTagBlock)
+{
+    uint8_t checksum = 0;
+    int length = 0;
+    int checksumLength = 0;
+    if(NULL == pNmea)
+        return 0;
+
+    pNmea++; //skip the $ or / for Tag Block
+    while (*pNmea != '\0')
+    {
+        checksum ^= *pNmea++;
+        length++;
+    }
+
+    if (isTagBlock) {
+        // length now contains tag block sentence string length not including / sign.
+        checksumLength = snprintf(pNmea, (maxSize-length-1), "*%02X\\", checksum);
+    } else {
+        // length now contains nmea sentence string length not including $ sign.
+        checksumLength = snprintf(pNmea, (maxSize-length-1), "*%02X\r\n", checksum);
+    }
+    // total length of nmea sentence is length of nmea sentence inc $ sign plus
+    // length of checksum (+1 is to cover the $ character in the length).
+    return (length + checksumLength + 1);
+}
+
+/*===========================================================================
+FUNCTION    loc_nmea_generate_GSA
+
+DESCRIPTION
+   Generate NMEA GSA sentences generated based on position report
+   Currently below sentences are generated:
+   - $GPGSA : GPS DOP and active SVs
+   - $GLGSA : GLONASS DOP and active SVs
+   - $GAGSA : GALILEO DOP and active SVs
+   - $GNGSA : GNSS DOP and active SVs
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   Number of SVs used
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static uint32_t loc_nmea_generate_GSA(const GpsLocationExtended &locationExtended,
+                              char* sentence,
+                              int bufSize,
+                              loc_nmea_sv_meta* sv_meta_p,
+                              std::vector<std::string> &nmeaArraystr,
+                              bool isTagBlockGroupingEnabled)
+{
+    if (!sentence || bufSize <= 0 || !sv_meta_p)
+    {
+        LOC_LOGE("NMEA Error invalid arguments.");
+        return 0;
+    }
+
+    char* pMarker = sentence;
+    int lengthRemaining = bufSize;
+    int length = 0;
+    int lengthTagBlock = 0;
+
+    uint32_t svUsedCount = 0;
+    uint32_t svUsedList[64] = {0};
+    uint32_t sentenceCount = 0;
+    uint32_t sentenceNumber = 1;
+    size_t svNumber = 1;
+    static uint32_t code = 1;
+
+    char fixType = '\0';
+
+    const char* talker = sv_meta_p->talker;
+    uint32_t svIdOffset = sv_meta_p->svIdOffset;
+    uint64_t mask = sv_meta_p->mask;
+
+    if (!(sv_meta_p->svTypeMask & (1 << GNSS_SV_TYPE_GLONASS))) {
+        svIdOffset = 0;
+    }
+
+    for (uint8_t i = 1; mask > 0 && svUsedCount < 64; i++)
+    {
+        if (mask & 1)
+            svUsedList[svUsedCount++] = i + svIdOffset;
+        mask = mask >> 1;
+    }
+
+    if (svUsedCount == 0) {
+        return 0;
+    } else {
+        sentenceNumber = 1;
+        sentenceCount = svUsedCount / 12 + (svUsedCount % 12 != 0);
+        svNumber = 1;
+    }
+    while (sentenceNumber <= sentenceCount) {
+        pMarker = sentence;
+        lengthRemaining = bufSize;
+        if (svUsedCount > 12 && isTagBlockGroupingEnabled) {
+            lengthTagBlock = snprintf(pMarker, lengthRemaining, "\\g:%d-%d-%d", sentenceNumber,
+                     sentenceCount, code);
+            if (MAX_TAG_BLOCK_GROUP_CODE == code) {
+                code = 1;
+            }
+            lengthTagBlock = loc_nmea_put_checksum(sentence, bufSize, true);
+            pMarker += lengthTagBlock;
+            lengthRemaining -= lengthTagBlock;
+        }
+        if (sv_meta_p->totalSvUsedCount == 0)
+            fixType = '1'; // no fix
+        else if (sv_meta_p->totalSvUsedCount <= 3)
+            fixType = '2'; // 2D fix
+        else
+            fixType = '3'; // 3D fix
+
+        // Start printing the sentence
+        // Format: $--GSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,p.p,h.h,v.v,s*cc
+        // a : Mode  : A : Automatic, allowed to automatically switch 2D/3D
+        // x : Fixtype : 1 (no fix), 2 (2D fix), 3 (3D fix)
+        // xx : 12 SV ID
+        // p.p : Position DOP (Dilution of Precision)
+        // h.h : Horizontal DOP
+        // v.v : Vertical DOP
+        // s : GNSS System Id
+        // cc : Checksum value
+        length = snprintf(pMarker, lengthRemaining, "$%sGSA,A,%c,", talker, fixType);
+        if (length < 0 || length >= lengthRemaining) {
+            LOC_LOGE("NMEA Error in string formatting");
+            return 0;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        // Add 12 satellite IDs
+        for (uint8_t i = 0; i < 12; i++, svNumber++)
+        {
+            if (svNumber <= svUsedCount)
+                length = snprintf(pMarker, lengthRemaining, "%02d,", svUsedList[svNumber - 1]);
+            else
+                length = snprintf(pMarker, lengthRemaining, ",");
+
+            if (length < 0 || length >= lengthRemaining) {
+                LOC_LOGE("NMEA Error in string formatting");
+                return 0;
+            }
+            pMarker += length;
+            lengthRemaining -= length;
+        }
+
+        // Add the position/horizontal/vertical DOP values
+        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_DOP)
+        {
+            length = snprintf(pMarker, lengthRemaining, "%.1f,%.1f,%.1f,",
+                    locationExtended.pdop,
+                    locationExtended.hdop,
+                    locationExtended.vdop);
+        }
+        else
+        {   // no dop
+            length = snprintf(pMarker, lengthRemaining, ",,,");
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        // system id
+        length = snprintf(pMarker, lengthRemaining, "%d", sv_meta_p->systemId);
+        pMarker += length;
+        lengthRemaining -= length;
+
+        /* Sentence is ready, add checksum and broadcast */
+        length = loc_nmea_put_checksum(sentence + lengthTagBlock, bufSize - lengthTagBlock, false);
+        nmeaArraystr.push_back(sentence);
+        sentenceNumber++;
+        if (!isTagBlockGroupingEnabled) {
+            break;
+        }
+    }
+    if (svUsedCount > 12 && isTagBlockGroupingEnabled) {
+        code++;
+    }
+    return svUsedCount;
+}
+
+/*===========================================================================
+FUNCTION    loc_nmea_generate_GSV
+
+DESCRIPTION
+   Generate NMEA GSV sentences generated based on sv report
+   Currently below sentences are generated:
+   - $GPGSV: GPS Satellites in View
+   - $GLGSV: GLONASS Satellites in View
+   - $GAGSV: GALILEO Satellites in View
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   NONE
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static void loc_nmea_generate_GSV(const GnssSvNotification &svNotify,
+                              char* sentence,
+                              int bufSize,
+                              loc_nmea_sv_meta* sv_meta_p,
+                              std::vector<std::string> &nmeaArraystr)
+{
+    if (!sentence || bufSize <= 0)
+    {
+        LOC_LOGE("NMEA Error invalid argument.");
+        return;
+    }
+
+    char* pMarker = sentence;
+    int lengthRemaining = bufSize;
+    int length = 0;
+    int sentenceCount = 0;
+    int sentenceNumber = 1;
+    size_t svNumber = 1;
+
+    const char* talker = sv_meta_p->talker;
+    uint32_t svIdOffset = sv_meta_p->svIdOffset;
+    int svCount = sv_meta_p->svCount;
+    if (svCount <= 0)
+    {
+        LOC_LOGV("No SV in view for talker ID:%s, signal ID:%X", talker, sv_meta_p->signalId);
+        return;
+    }
+
+    if ((1 << GNSS_SV_TYPE_GLONASS) & sv_meta_p->svTypeMask) {
+        svIdOffset = 0;
+    }
+    svNumber = 1;
+    sentenceNumber = 1;
+    sentenceCount = svCount / 4 + (svCount % 4 != 0);
+
+    while (sentenceNumber <= sentenceCount)
+    {
+        pMarker = sentence;
+        lengthRemaining = bufSize;
+
+        length = snprintf(pMarker, lengthRemaining, "$%sGSV,%d,%d,%02d",
+                talker, sentenceCount, sentenceNumber, svCount);
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        for (int i=0; (svNumber <= svNotify.count) && (i < 4);  svNumber++)
+        {
+            GnssSignalTypeMask signalType = svNotify.gnssSvs[svNumber-1].gnssSignalTypeMask;
+            if (0 == signalType) {
+                // If no signal type in report, it means default L1,G1,E1,B1I
+                switch (svNotify.gnssSvs[svNumber - 1].type)
+                {
+                    case GNSS_SV_TYPE_GPS:
+                        signalType = GNSS_SIGNAL_GPS_L1CA;
+                        break;
+                    case GNSS_SV_TYPE_GLONASS:
+                        signalType = GNSS_SIGNAL_GLONASS_G1;
+                        break;
+                    case GNSS_SV_TYPE_GALILEO:
+                        signalType = GNSS_SIGNAL_GALILEO_E1;
+                        break;
+                    case GNSS_SV_TYPE_QZSS:
+                        signalType = GNSS_SIGNAL_QZSS_L1CA;
+                        break;
+                    case GNSS_SV_TYPE_BEIDOU:
+                        signalType = GNSS_SIGNAL_BEIDOU_B1I;
+                        break;
+                    case GNSS_SV_TYPE_SBAS:
+                        signalType = GNSS_SIGNAL_SBAS_L1;
+                        break;
+                    case GNSS_SV_TYPE_NAVIC:
+                        signalType = GNSS_SIGNAL_NAVIC_L5;
+                        break;
+                    default:
+                        LOC_LOGE("NMEA Error unknow constellation type: %d",
+                                svNotify.gnssSvs[svNumber - 1].type);
+                        continue;
+                }
+            }
+
+            if ((sv_meta_p->svTypeMask & (1 << svNotify.gnssSvs[svNumber - 1].type)) &&
+                    sv_meta_p->signalId == convert_signalType_to_signalId(signalType))
+            {
+                if (GNSS_SV_TYPE_SBAS == svNotify.gnssSvs[svNumber - 1].type) {
+                    svIdOffset = SBAS_SV_ID_OFFSET;
+                }
+                if (GNSS_SV_TYPE_GLONASS == svNotify.gnssSvs[svNumber - 1].type &&
+                    GLO_SV_PRN_SLOT_UNKNOWN == svNotify.gnssSvs[svNumber - 1].svId) {
+                    length = snprintf(pMarker, lengthRemaining, ",,%02d,%03d,",
+                        (int)(0.5 + svNotify.gnssSvs[svNumber - 1].elevation), //float to int
+                        (int)(0.5 + svNotify.gnssSvs[svNumber - 1].azimuth)); //float to int
+                } else {
+                    length = snprintf(pMarker, lengthRemaining, ",%02d,%02d,%03d,",
+                        svNotify.gnssSvs[svNumber - 1].svId - svIdOffset,
+                        (int)(0.5 + svNotify.gnssSvs[svNumber - 1].elevation), //float to int
+                        (int)(0.5 + svNotify.gnssSvs[svNumber - 1].azimuth)); //float to int
+                }
+                if (length < 0 || length >= lengthRemaining)
+                {
+                    LOC_LOGE("NMEA Error in string formatting");
+                    return;
+                }
+                pMarker += length;
+                lengthRemaining -= length;
+
+                if (svNotify.gnssSvs[svNumber - 1].cN0Dbhz > 0)
+                {
+                    length = snprintf(pMarker, lengthRemaining,"%02d",
+                            (int)(0.5 + svNotify.gnssSvs[svNumber - 1].cN0Dbhz)); //float to int
+
+                    if (length < 0 || length >= lengthRemaining)
+                    {
+                        LOC_LOGE("NMEA Error in string formatting");
+                        return;
+                    }
+                    pMarker += length;
+                    lengthRemaining -= length;
+                }
+
+                i++;
+            }
+
+        }
+
+        // append signalId
+        length = snprintf(pMarker, lengthRemaining,",%X",sv_meta_p->signalId);
+        pMarker += length;
+        lengthRemaining -= length;
+
+        length = loc_nmea_put_checksum(sentence, bufSize, false);
+        nmeaArraystr.push_back(sentence);
+        sentenceNumber++;
+
+    }  //while
+}
+
+/*===========================================================================
+FUNCTION    loc_nmea_generate_DTM
+
+DESCRIPTION
+   Generate NMEA DTM sentences generated based on position report
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   NONE
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static void loc_nmea_generate_DTM(const LocLla &ref_lla,
+                                  const LocLla &local_lla,
+                                  char *talker,
+                                  char *sentence,
+                                  int bufSize)
+{
+    char* pMarker = sentence;
+    int lengthRemaining = bufSize;
+    int length = 0;
+    int datum_type;
+    char ref_datum[4] = {0};
+    char local_datum[4] = {0};
+    double lla_offset[3] = {0};
+    char latHem, longHem;
+    double latMins, longMins;
+
+
+
+    datum_type = loc_get_datum_type();
+    switch (datum_type) {
+        case LOC_GNSS_DATUM_WGS84:
+            ref_datum[0] = 'W';
+            ref_datum[1] = '8';
+            ref_datum[2] = '4';
+            local_datum[0] = 'P';
+            local_datum[1] = '9';
+            local_datum[2] = '0';
+            break;
+        case LOC_GNSS_DATUM_PZ90:
+            ref_datum[0] = 'P';
+            ref_datum[1] = '9';
+            ref_datum[2] = '0';
+            local_datum[0] = 'W';
+            local_datum[1] = '8';
+            local_datum[2] = '4';
+            break;
+        default:
+            break;
+    }
+    length = snprintf(pMarker , lengthRemaining , "$%sDTM,%s,," , talker, local_datum);
+    if (length < 0 || length >= lengthRemaining) {
+        LOC_LOGE("NMEA Error in string formatting");
+        return;
+    }
+    pMarker += length;
+    lengthRemaining -= length;
+
+    lla_offset[0] = local_lla.lat - ref_lla.lat;
+    lla_offset[1] = fmod(local_lla.lon - ref_lla.lon, 360.0);
+    if (lla_offset[1] < -180.0) {
+        lla_offset[1] += 360.0;
+    } else if ( lla_offset[1] > 180.0) {
+        lla_offset[1] -= 360.0;
+    }
+    lla_offset[2] = local_lla.alt - ref_lla.alt;
+    if (lla_offset[0] > 0.0) {
+        latHem = 'N';
+    } else {
+        latHem = 'S';
+        lla_offset[0] *= -1.0;
+    }
+    latMins = fmod(lla_offset[0] * 60.0, 60.0);
+    if (lla_offset[1] < 0.0) {
+        longHem = 'W';
+        lla_offset[1] *= -1.0;
+    }else {
+        longHem = 'E';
+    }
+    longMins = fmod(lla_offset[1] * 60.0, 60.0);
+    length = snprintf(pMarker, lengthRemaining, "%02d%09.6lf,%c,%03d%09.6lf,%c,%.3lf,",
+                     (uint8_t)floor(lla_offset[0]), latMins, latHem,
+                     (uint8_t)floor(lla_offset[1]), longMins, longHem, lla_offset[2]);
+    if (length < 0 || length >= lengthRemaining) {
+        LOC_LOGE("NMEA Error in string formatting");
+        return;
+    }
+    pMarker += length;
+    lengthRemaining -= length;
+    length = snprintf(pMarker , lengthRemaining , "%s" , ref_datum);
+    if (length < 0 || length >= lengthRemaining) {
+        LOC_LOGE("NMEA Error in string formatting");
+        return;
+    }
+    pMarker += length;
+    lengthRemaining -= length;
+
+    length = loc_nmea_put_checksum(sentence, bufSize, false);
+}
+
+/*===========================================================================
+FUNCTION    get_utctime_with_leapsecond_transition
+
+DESCRIPTION
+   This function returns true if the position report is generated during
+   leap second transition period. If not, then the utc timestamp returned
+   will be set to the timestamp in the position report. If it is,
+   then the utc timestamp returned will need to take into account
+   of the leap second transition so that proper calendar year/month/date
+   can be calculated from the returned utc timestamp.
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   true: position report is generated in leap second transition period.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static bool get_utctime_with_leapsecond_transition(
+        const UlpLocation &location,
+        const GpsLocationExtended &locationExtended,
+        const LocationSystemInfo &systemInfo,
+        LocGpsUtcTime &utcPosTimestamp)
+{
+    bool inTransition = false;
+
+    // position report is not generated during leap second transition,
+    // we can use the UTC timestamp from position report as is
+    utcPosTimestamp = location.gpsLocation.timestamp;
+
+    // Check whether we are in leap second transition.
+    // If so, per NMEA spec, we need to display the extra second in format of 23:59:60
+    // with year/month/date not getting advanced.
+    if ((locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_GPS_TIME) &&
+        ((systemInfo.systemInfoMask & LOCATION_SYS_INFO_LEAP_SECOND) &&
+         (systemInfo.leapSecondSysInfo.leapSecondInfoMask &
+          LEAP_SECOND_SYS_INFO_LEAP_SECOND_CHANGE_BIT))) {
+
+        const LeapSecondChangeInfo  &leapSecondChangeInfo =
+            systemInfo.leapSecondSysInfo.leapSecondChangeInfo;
+        const GnssSystemTimeStructType &gpsTimestampLsChange =
+            leapSecondChangeInfo.gpsTimestampLsChange;
+
+        uint64_t gpsTimeLsChange = gpsTimestampLsChange.systemWeek * MSEC_IN_ONE_WEEK +
+                                   gpsTimestampLsChange.systemMsec;
+        uint64_t gpsTimePosReport = locationExtended.gpsTime.gpsWeek * MSEC_IN_ONE_WEEK +
+                                    locationExtended.gpsTime.gpsTimeOfWeekMs;
+        // we are only dealing with positive leap second change, as negative
+        // leap second change has never occurred and should not occur in future
+        if (leapSecondChangeInfo.leapSecondsAfterChange >
+            leapSecondChangeInfo.leapSecondsBeforeChange) {
+            // leap second adjustment is always 1 second at a time. It can happen
+            // every quarter end and up to four times per year.
+            if ((gpsTimePosReport >= gpsTimeLsChange) &&
+                (gpsTimePosReport < (gpsTimeLsChange + 1000))) {
+                inTransition = true;
+                utcPosTimestamp = gpsTimeLsChange + UTC_GPS_OFFSET_MSECS -
+                                  leapSecondChangeInfo.leapSecondsBeforeChange * 1000;
+
+                // we substract 1000 milli-seconds from UTC timestmap in order to calculate the
+                // proper year, month and date during leap second transtion.
+                // Let us give an example, assuming leap second transition is scheduled on 2019,
+                // Dec 31st mid night. When leap second transition is happening,
+                // instead of outputting the time as 2020, Jan, 1st, 00 hour, 00 min, and 00 sec.
+                // The time need to be displayed as 2019, Dec, 31st, 23 hour, 59 min and 60 sec.
+                utcPosTimestamp -= 1000;
+            }
+        }
+    }
+    return inTransition;
+}
+
+/*===========================================================================
+FUNCTION    loc_nmea_get_fix_quality
+
+DESCRIPTION
+   This function obtains the fix quality for GGA sentence, mode indicator
+   for RMC and VTG sentence based on nav solution mask and tech mask in
+   the postion report.
+
+DEPENDENCIES
+   NONE
+
+Output parameter
+   ggaGpsQuality: gps quality field in GGA sentence
+   rmcModeIndicator: mode indicator field in RMC sentence
+   vtgModeIndicator: mode indicator field in VTG sentence
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static void loc_nmea_get_fix_quality(const UlpLocation & location,
+                                     const GpsLocationExtended & locationExtended,
+                                     bool custom_gga_fix_quality,
+                                     char ggaGpsQuality[3],
+                                     char & rmcModeIndicator,
+                                     char & vtgModeIndicator,
+                                     char gnsModeIndicator[7]) {
+
+    ggaGpsQuality[0] = '0'; // 0 means no fix
+    rmcModeIndicator = 'N'; // N means no fix
+    vtgModeIndicator = 'N'; // N means no fix
+    memset(gnsModeIndicator, 'N', 6); // N means no fix
+    gnsModeIndicator[6] = '\0';
+    do {
+        if (!(location.gpsLocation.flags & LOC_GPS_LOCATION_HAS_LAT_LONG)){
+            break;
+        }
+        // NOTE: Order of the check is important
+        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_NAV_SOLUTION_MASK) {
+            if (LOC_NAV_MASK_PPP_CORRECTION & locationExtended.navSolutionMask) {
+                ggaGpsQuality[0] = '2';    // 2 means DGPS fix
+                rmcModeIndicator = 'P'; // P means precise
+                vtgModeIndicator = 'P'; // P means precise
+                if (locationExtended.gnss_sv_used_ids.gps_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[0] = 'P'; // P means precise
+                if (locationExtended.gnss_sv_used_ids.glo_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[1] = 'P'; // P means precise
+                if (locationExtended.gnss_sv_used_ids.gal_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[2] = 'P'; // P means precise
+                if (locationExtended.gnss_sv_used_ids.bds_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[3] = 'P'; // P means precise
+                if (locationExtended.gnss_sv_used_ids.qzss_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[4] = 'P'; // P means precise
+                if (locationExtended.gnss_sv_used_ids.navic_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[5] = 'P'; // P means precise
+                break;
+            } else if (LOC_NAV_MASK_RTK_FIXED_CORRECTION & locationExtended.navSolutionMask){
+                ggaGpsQuality[0] = '4';    // 4 means RTK Fixed fix
+                rmcModeIndicator = 'R'; // use R (RTK fixed)
+                vtgModeIndicator = 'D'; // use D (differential) as
+                                        // no RTK fixed defined for VTG in NMEA 183 spec
+                if (locationExtended.gnss_sv_used_ids.gps_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[0] = 'R'; // R means RTK fixed
+                if (locationExtended.gnss_sv_used_ids.glo_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[1] = 'R'; // R means RTK fixed
+                if (locationExtended.gnss_sv_used_ids.gal_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[2] = 'R'; // R means RTK fixed
+                if (locationExtended.gnss_sv_used_ids.bds_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[3] = 'R'; // R means RTK fixed
+                if (locationExtended.gnss_sv_used_ids.qzss_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[4] = 'R'; // R means RTK fixed
+                if (locationExtended.gnss_sv_used_ids.navic_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[5] = 'R'; // R means RTK fixed
+                break;
+            } else if (LOC_NAV_MASK_RTK_CORRECTION & locationExtended.navSolutionMask){
+                ggaGpsQuality[0] = '5';    // 5 means RTK float fix
+                rmcModeIndicator = 'F'; // F means RTK float fix
+                vtgModeIndicator = 'D'; // use D (differential) as
+                                        // no RTK float defined for VTG in NMEA 183 spec
+                if (locationExtended.gnss_sv_used_ids.gps_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[0] = 'F'; // F means RTK float fix
+                if (locationExtended.gnss_sv_used_ids.glo_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[1] = 'F'; // F means RTK float fix
+                if (locationExtended.gnss_sv_used_ids.gal_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[2] = 'F'; // F means RTK float fix
+                if (locationExtended.gnss_sv_used_ids.bds_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[3] = 'F'; // F means RTK float fix
+                if (locationExtended.gnss_sv_used_ids.qzss_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[4] = 'F'; // F means RTK float fix
+                if (locationExtended.gnss_sv_used_ids.navic_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[5] = 'F'; // F means RTK float fix
+                break;
+            } else if (LOC_NAV_MASK_DGNSS_CORRECTION & locationExtended.navSolutionMask){
+                ggaGpsQuality[0] = '2';    // 2 means DGPS fix
+                rmcModeIndicator = 'D'; // D means differential
+                vtgModeIndicator = 'D'; // D means differential
+                if (locationExtended.gnss_sv_used_ids.gps_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[0] = 'D'; // D means differential
+                if (locationExtended.gnss_sv_used_ids.glo_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[1] = 'D'; // D means differential
+                if (locationExtended.gnss_sv_used_ids.gal_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[2] = 'D'; // D means differential
+                if (locationExtended.gnss_sv_used_ids.bds_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[3] = 'D'; // D means differential
+                if (locationExtended.gnss_sv_used_ids.qzss_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[4] = 'D'; // D means differential
+                if (locationExtended.gnss_sv_used_ids.navic_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[5] = 'D'; // D means differential
+                break;
+            } else if (LOC_NAV_MASK_SBAS_CORRECTION_IONO & locationExtended.navSolutionMask){
+                ggaGpsQuality[0] = '2';    // 2 means DGPS fix
+                rmcModeIndicator = 'D'; // D means differential
+                vtgModeIndicator = 'D'; // D means differential
+                if (locationExtended.gnss_sv_used_ids.gps_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[0] = 'D'; // D means differential
+                if (locationExtended.gnss_sv_used_ids.glo_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[1] = 'D'; // D means differential
+                if (locationExtended.gnss_sv_used_ids.gal_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[2] = 'D'; // D means differential
+                if (locationExtended.gnss_sv_used_ids.bds_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[3] = 'D'; // D means differential
+                if (locationExtended.gnss_sv_used_ids.qzss_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[4] = 'D'; // D means differential
+                if (locationExtended.gnss_sv_used_ids.navic_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[5] = 'D'; // D means differential
+                break;
+            }
+        }
+        // NOTE: Order of the check is important
+        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_POS_TECH_MASK) {
+            if (LOC_POS_TECH_MASK_SATELLITE & locationExtended.tech_mask){
+                ggaGpsQuality[0] = '1'; // 1 means GPS
+                rmcModeIndicator = 'A'; // A means autonomous
+                vtgModeIndicator = 'A'; // A means autonomous
+                if (locationExtended.gnss_sv_used_ids.gps_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[0] = 'A'; // A means autonomous
+                if (locationExtended.gnss_sv_used_ids.glo_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[1] = 'A'; // A means autonomous
+                if (locationExtended.gnss_sv_used_ids.gal_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[2] = 'A'; // A means autonomous
+                if (locationExtended.gnss_sv_used_ids.bds_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[3] = 'A'; // A means autonomous
+                if (locationExtended.gnss_sv_used_ids.qzss_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[4] = 'A'; // A means autonomous
+                if (locationExtended.gnss_sv_used_ids.navic_sv_used_ids_mask ? 1 : 0)
+                    gnsModeIndicator[5] = 'A'; // A means autonomous
+                break;
+            } else if (LOC_POS_TECH_MASK_SENSORS & locationExtended.tech_mask){
+                ggaGpsQuality[0] = '6'; // 6 means estimated (dead reckoning)
+                rmcModeIndicator = 'E'; // E means estimated (dead reckoning)
+                vtgModeIndicator = 'E'; // E means estimated (dead reckoning)
+                memset(gnsModeIndicator, 'E', 6); // E means estimated (dead reckoning)
+                break;
+            }
+        }
+    } while (0);
+
+    do {
+        // check for customized nmea enabled or not
+        // with customized GGA quality enabled
+        // PPP fix w/o sensor: 59, PPP fix w/ sensor: 69
+        // DGNSS/SBAS correction fix w/o sensor: 2, w/ sensor: 62
+        // RTK fixed fix w/o sensor: 4, w/ sensor: 64
+        // RTK float fix w/o sensor: 5, w/ sensor: 65
+        // SPE fix w/o sensor: 1, and w/ sensor: 61
+        // Sensor dead reckoning fix: 6
+        if (true == custom_gga_fix_quality) {
+            if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_NAV_SOLUTION_MASK) {
+                // PPP fix w/o sensor: fix quality will now be 59
+                // PPP fix w sensor: fix quality will now be 69
+                if (LOC_NAV_MASK_PPP_CORRECTION & locationExtended.navSolutionMask) {
+                    if ((locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_POS_TECH_MASK) &&
+                        (LOC_POS_TECH_MASK_SENSORS & locationExtended.tech_mask)) {
+                        ggaGpsQuality[0] = '6';
+                        ggaGpsQuality[1] = '9';
+                    } else {
+                        ggaGpsQuality[0] = '5';
+                        ggaGpsQuality[1] = '9';
+                    }
+                    break;
+                }
+            }
+
+            if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_POS_TECH_MASK) {
+                if (LOC_POS_TECH_MASK_SENSORS & locationExtended.tech_mask){
+                    char ggaQuality_copy = ggaGpsQuality[0];
+                    ggaGpsQuality[0] = '6'; // 6 sensor assisted
+                    // RTK fixed fix w/ sensor: fix quality will now be 64
+                    // RTK float fix w/ sensor: 65
+                    // DGNSS and/or SBAS correction fix and w/ sensor: 62
+                    // GPS fix without correction and w/ sensor: 61
+                    if ((LOC_NAV_MASK_RTK_FIXED_CORRECTION & locationExtended.navSolutionMask)||
+                            (LOC_NAV_MASK_RTK_CORRECTION & locationExtended.navSolutionMask)||
+                            (LOC_NAV_MASK_DGNSS_CORRECTION & locationExtended.navSolutionMask)||
+                            (LOC_NAV_MASK_SBAS_CORRECTION_IONO & locationExtended.navSolutionMask)||
+                            (LOC_POS_TECH_MASK_SATELLITE & locationExtended.tech_mask)) {
+                        ggaGpsQuality[1] = ggaQuality_copy;
+                        break;
+                    }
+                }
+            }
+        }
+    } while (0);
+
+    LOC_LOGv("gps quality: %s, rmc mode indicator: %c, vtg mode indicator: %c",
+             ggaGpsQuality, rmcModeIndicator, vtgModeIndicator);
+}
+
+/*===========================================================================
+FUNCTION    loc_nmea_generate_pos
+
+DESCRIPTION
+   Generate NMEA sentences generated based on position report
+   Currently below sentences are generated within this function:
+   - $GPGSA : GPS DOP and active SVs
+   - $GLGSA : GLONASS DOP and active SVs
+   - $GAGSA : GALILEO DOP and active SVs
+   - $GNGSA : GNSS DOP and active SVs
+   - $--VTG : Track made good and ground speed
+   - $--RMC : Recommended minimum navigation information
+   - $--GGA : Time, position and fix related data
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   0
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+void loc_nmea_generate_pos(const UlpLocation &location,
+                               const GpsLocationExtended &locationExtended,
+                               const LocationSystemInfo &systemInfo,
+                               unsigned char generate_nmea,
+                               bool custom_gga_fix_quality,
+                               std::vector<std::string> &nmeaArraystr,
+                               int& indexOfGGA,
+                               bool isTagBlockGroupingEnabled)
+{
+    ENTRY_LOG();
+
+    indexOfGGA = -1;
+    LocGpsUtcTime utcPosTimestamp = 0;
+    bool inLsTransition = false;
+
+    inLsTransition = get_utctime_with_leapsecond_transition
+                    (location, locationExtended, systemInfo, utcPosTimestamp);
+
+    time_t utcTime(utcPosTimestamp/1000);
+    struct tm result;
+    tm * pTm = gmtime_r(&utcTime, &result);
+    if (NULL == pTm) {
+        LOC_LOGE("gmtime failed");
+        return;
+    }
+
+    char sentence[NMEA_SENTENCE_MAX_LENGTH] = {0};
+    char sentence_DTM[NMEA_SENTENCE_MAX_LENGTH] = {0};
+    char sentence_RMC[NMEA_SENTENCE_MAX_LENGTH] = {0};
+    char sentence_GNS[NMEA_SENTENCE_MAX_LENGTH] = {0};
+    char sentence_GGA[NMEA_SENTENCE_MAX_LENGTH] = {0};
+    char* pMarker = sentence;
+    int lengthRemaining = sizeof(sentence);
+    int length = 0;
+    int utcYear = pTm->tm_year % 100; // 2 digit year
+    int utcMonth = pTm->tm_mon + 1; // tm_mon starts at zero
+    int utcDay = pTm->tm_mday;
+    int utcHours = pTm->tm_hour;
+    int utcMinutes = pTm->tm_min;
+    int utcSeconds = pTm->tm_sec;
+    int utcMSeconds = (location.gpsLocation.timestamp)%1000;
+    int datum_type = loc_get_datum_type();
+    LocEcef ecef_w84;
+    LocEcef ecef_p90;
+    LocLla  lla_w84;
+    LocLla  lla_p90;
+    LocLla  ref_lla;
+    LocLla  local_lla;
+
+    if (inLsTransition) {
+        // During leap second transition, we need to display the extra
+        // leap second of hour, minute, second as (23:59:60)
+        utcHours = 23;
+        utcMinutes = 59;
+        utcSeconds = 60;
+        // As UTC timestamp is freezing during leap second transition,
+        // retrieve milli-seconds portion from GPS timestamp.
+        utcMSeconds = locationExtended.gpsTime.gpsTimeOfWeekMs % 1000;
+    }
+
+   loc_sv_cache_info sv_cache_info = {};
+
+    if (GPS_LOCATION_EXTENDED_HAS_GNSS_SV_USED_DATA & locationExtended.flags) {
+        sv_cache_info.gps_used_mask =
+                locationExtended.gnss_sv_used_ids.gps_sv_used_ids_mask;
+        sv_cache_info.glo_used_mask =
+                locationExtended.gnss_sv_used_ids.glo_sv_used_ids_mask;
+        sv_cache_info.gal_used_mask =
+                locationExtended.gnss_sv_used_ids.gal_sv_used_ids_mask;
+        sv_cache_info.bds_used_mask =
+                locationExtended.gnss_sv_used_ids.bds_sv_used_ids_mask;
+        sv_cache_info.qzss_used_mask =
+                locationExtended.gnss_sv_used_ids.qzss_sv_used_ids_mask;
+        sv_cache_info.navic_used_mask =
+                locationExtended.gnss_sv_used_ids.navic_sv_used_ids_mask;
+    }
+
+    if (generate_nmea) {
+        char talker[3] = {'G', 'P', '\0'};
+        uint32_t svUsedCount = 0;
+        uint32_t count = 0;
+        loc_nmea_sv_meta sv_meta;
+        // -------------------
+        // ---$GPGSA/$GNGSA---
+        // -------------------
+
+        count = loc_nmea_generate_GSA(locationExtended, sentence, sizeof(sentence),
+                        loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_GPS,
+                        GNSS_SIGNAL_GPS_L1CA, true), nmeaArraystr, isTagBlockGroupingEnabled);
+        if (count > 0)
+        {
+            svUsedCount += count;
+            talker[0] = sv_meta.talker[0];
+            talker[1] = sv_meta.talker[1];
+        }
+
+        // -------------------
+        // ---$GLGSA/$GNGSA---
+        // -------------------
+
+        count = loc_nmea_generate_GSA(locationExtended, sentence, sizeof(sentence),
+                        loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_GLONASS,
+                        GNSS_SIGNAL_GLONASS_G1, true), nmeaArraystr, isTagBlockGroupingEnabled);
+        if (count > 0)
+        {
+            svUsedCount += count;
+            talker[0] = sv_meta.talker[0];
+            talker[1] = sv_meta.talker[1];
+        }
+
+        // -------------------
+        // ---$GAGSA/$GNGSA---
+        // -------------------
+
+        count = loc_nmea_generate_GSA(locationExtended, sentence, sizeof(sentence),
+                        loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_GALILEO,
+                        GNSS_SIGNAL_GALILEO_E1, true), nmeaArraystr, isTagBlockGroupingEnabled);
+        if (count > 0)
+        {
+            svUsedCount += count;
+            talker[0] = sv_meta.talker[0];
+            talker[1] = sv_meta.talker[1];
+        }
+
+        // ----------------------------
+        // ---$GBGSA/$GNGSA (BEIDOU)---
+        // ----------------------------
+        count = loc_nmea_generate_GSA(locationExtended, sentence, sizeof(sentence),
+                        loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_BEIDOU,
+                        GNSS_SIGNAL_BEIDOU_B1I, true), nmeaArraystr, isTagBlockGroupingEnabled);
+        if (count > 0)
+        {
+            svUsedCount += count;
+            talker[0] = sv_meta.talker[0];
+            talker[1] = sv_meta.talker[1];
+        }
+
+        // --------------------------
+        // ---$GQGSA/$GNGSA (QZSS)---
+        // --------------------------
+
+        count = loc_nmea_generate_GSA(locationExtended, sentence, sizeof(sentence),
+                        loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_QZSS,
+                        GNSS_SIGNAL_QZSS_L1CA, true), nmeaArraystr, isTagBlockGroupingEnabled);
+        if (count > 0)
+        {
+            svUsedCount += count;
+            talker[0] = sv_meta.talker[0];
+            talker[1] = sv_meta.talker[1];
+        }
+
+        // if svUsedCount is 0, it means we do not generate any GSA sentence yet.
+        // in this case, generate an empty GSA sentence
+        if (svUsedCount == 0) {
+            strlcpy(sentence, "$GPGSA,A,1,,,,,,,,,,,,,,,,", sizeof(sentence));
+            length = loc_nmea_put_checksum(sentence, sizeof(sentence), false);
+            nmeaArraystr.push_back(sentence);
+        }
+
+        char ggaGpsQuality[3] = {'0', '\0', '\0'};
+        char rmcModeIndicator = 'N';
+        char vtgModeIndicator = 'N';
+        char gnsModeIndicator[7] = {'N', 'N', 'N', 'N', 'N', 'N', '\0'};
+        loc_nmea_get_fix_quality(location, locationExtended, custom_gga_fix_quality,
+                                 ggaGpsQuality, rmcModeIndicator, vtgModeIndicator, gnsModeIndicator);
+
+        // -------------------
+        // ------$--VTG-------
+        // -------------------
+
+        pMarker = sentence;
+        lengthRemaining = sizeof(sentence);
+
+        if (location.gpsLocation.flags & LOC_GPS_LOCATION_HAS_BEARING)
+        {
+            float magTrack = location.gpsLocation.bearing;
+            if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_MAG_DEV)
+            {
+                magTrack = location.gpsLocation.bearing - locationExtended.magneticDeviation;
+                if (magTrack < 0.0)
+                    magTrack += 360.0;
+                else if (magTrack > 360.0)
+                    magTrack -= 360.0;
+            }
+
+            length = snprintf(pMarker, lengthRemaining, "$%sVTG,%.1lf,T,%.1lf,M,", talker, location.gpsLocation.bearing, magTrack);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining, "$%sVTG,,T,,M,", talker);
+        }
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (location.gpsLocation.flags & LOC_GPS_LOCATION_HAS_SPEED)
+        {
+            float speedKnots = location.gpsLocation.speed * (3600.0/1852.0);
+            float speedKmPerHour = location.gpsLocation.speed * 3.6;
+
+            length = snprintf(pMarker, lengthRemaining, "%.1lf,N,%.1lf,K,", speedKnots, speedKmPerHour);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining, ",N,,K,");
+        }
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        length = snprintf(pMarker, lengthRemaining, "%c", vtgModeIndicator);
+
+        length = loc_nmea_put_checksum(sentence, sizeof(sentence), false);
+        nmeaArraystr.push_back(sentence);
+
+        memset(&ecef_w84, 0, sizeof(ecef_w84));
+        memset(&ecef_p90, 0, sizeof(ecef_p90));
+        memset(&lla_w84, 0, sizeof(lla_w84));
+        memset(&lla_p90, 0, sizeof(lla_p90));
+        memset(&ref_lla, 0, sizeof(ref_lla));
+        memset(&local_lla, 0, sizeof(local_lla));
+        lla_w84.lat = location.gpsLocation.latitude / 180.0 * M_PI;
+        lla_w84.lon = location.gpsLocation.longitude / 180.0 * M_PI;
+        lla_w84.alt = location.gpsLocation.altitude;
+
+        convert_Lla_to_Ecef(lla_w84, ecef_w84);
+        convert_WGS84_to_PZ90(ecef_w84, ecef_p90);
+        convert_Ecef_to_Lla(ecef_p90, lla_p90);
+
+        switch (datum_type) {
+            case LOC_GNSS_DATUM_WGS84:
+                ref_lla.lat = location.gpsLocation.latitude;
+                ref_lla.lon = location.gpsLocation.longitude;
+                ref_lla.alt = location.gpsLocation.altitude;
+                local_lla.lat = lla_p90.lat / M_PI * 180.0;
+                local_lla.lon = lla_p90.lon / M_PI * 180.0;
+                local_lla.alt = lla_p90.alt;
+                break;
+            case LOC_GNSS_DATUM_PZ90:
+                ref_lla.lat = lla_p90.lat / M_PI * 180.0;
+                ref_lla.lon = lla_p90.lon / M_PI * 180.0;
+                ref_lla.alt = lla_p90.alt;
+                local_lla.lat = location.gpsLocation.latitude;
+                local_lla.lon = location.gpsLocation.longitude;
+                local_lla.alt = location.gpsLocation.altitude;
+                break;
+            default:
+                break;
+        }
+
+        // -------------------
+        // ------$--DTM-------
+        // -------------------
+        loc_nmea_generate_DTM(ref_lla, local_lla, talker, sentence_DTM, sizeof(sentence_DTM));
+
+        // -------------------
+        // ------$--RMC-------
+        // -------------------
+
+        pMarker = sentence_RMC;
+        lengthRemaining = sizeof(sentence_RMC);
+
+        bool validFix = ((0 != sv_cache_info.gps_used_mask) ||
+                (0 != sv_cache_info.glo_used_mask) ||
+                (0 != sv_cache_info.gal_used_mask) ||
+                (0 != sv_cache_info.qzss_used_mask) ||
+                (0 != sv_cache_info.bds_used_mask));
+
+        if (validFix) {
+            length = snprintf(pMarker, lengthRemaining, "$%sRMC,%02d%02d%02d.%02d,A,",
+                              talker, utcHours, utcMinutes, utcSeconds, utcMSeconds/10);
+        } else {
+            length = snprintf(pMarker, lengthRemaining, "$%sRMC,%02d%02d%02d.%02d,V,",
+                              talker, utcHours, utcMinutes, utcSeconds, utcMSeconds/10);
+        }
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (location.gpsLocation.flags & LOC_GPS_LOCATION_HAS_LAT_LONG)
+        {
+            double latitude = ref_lla.lat;
+            double longitude = ref_lla.lon;
+            char latHemisphere;
+            char lonHemisphere;
+            double latMinutes;
+            double lonMinutes;
+
+            if (latitude > 0)
+            {
+                latHemisphere = 'N';
+            }
+            else
+            {
+                latHemisphere = 'S';
+                latitude *= -1.0;
+            }
+
+            if (longitude < 0)
+            {
+                lonHemisphere = 'W';
+                longitude *= -1.0;
+            }
+            else
+            {
+                lonHemisphere = 'E';
+            }
+
+            latMinutes = fmod(latitude * 60.0 , 60.0);
+            lonMinutes = fmod(longitude * 60.0 , 60.0);
+
+            length = snprintf(pMarker, lengthRemaining, "%02d%09.6lf,%c,%03d%09.6lf,%c,",
+                              (uint8_t)floor(latitude), latMinutes, latHemisphere,
+                              (uint8_t)floor(longitude),lonMinutes, lonHemisphere);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining,",,,,");
+        }
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (location.gpsLocation.flags & LOC_GPS_LOCATION_HAS_SPEED)
+        {
+            float speedKnots = location.gpsLocation.speed * (3600.0/1852.0);
+            length = snprintf(pMarker, lengthRemaining, "%.1lf,", speedKnots);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining, ",");
+        }
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (location.gpsLocation.flags & LOC_GPS_LOCATION_HAS_BEARING)
+        {
+            length = snprintf(pMarker, lengthRemaining, "%.1lf,", location.gpsLocation.bearing);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining, ",");
+        }
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        length = snprintf(pMarker, lengthRemaining, "%2.2d%2.2d%2.2d,",
+                          utcDay, utcMonth, utcYear);
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_MAG_DEV)
+        {
+            float magneticVariation = locationExtended.magneticDeviation;
+            char direction;
+            if (magneticVariation < 0.0)
+            {
+                direction = 'W';
+                magneticVariation *= -1.0;
+            }
+            else
+            {
+                direction = 'E';
+            }
+
+            length = snprintf(pMarker, lengthRemaining, "%.1lf,%c,",
+                              magneticVariation, direction);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining, ",,");
+        }
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        length = snprintf(pMarker, lengthRemaining, "%c", rmcModeIndicator);
+        pMarker += length;
+        lengthRemaining -= length;
+
+        // hardcode Navigation Status field to 'V'
+        length = snprintf(pMarker, lengthRemaining, ",%c", 'V');
+
+        length = loc_nmea_put_checksum(sentence_RMC, sizeof(sentence_RMC), false);
+
+        // -------------------
+        // ------$--GNS-------
+        // -------------------
+
+        pMarker = sentence_GNS;
+        lengthRemaining = sizeof(sentence_GNS);
+
+        length = snprintf(pMarker, lengthRemaining, "$%sGNS,%02d%02d%02d.%02d," ,
+                          talker, utcHours, utcMinutes, utcSeconds, utcMSeconds/10);
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (location.gpsLocation.flags & LOC_GPS_LOCATION_HAS_LAT_LONG)
+        {
+            double latitude = ref_lla.lat;
+            double longitude = ref_lla.lon;
+            char latHemisphere;
+            char lonHemisphere;
+            double latMinutes;
+            double lonMinutes;
+
+            if (latitude > 0)
+            {
+                latHemisphere = 'N';
+            }
+            else
+            {
+                latHemisphere = 'S';
+                latitude *= -1.0;
+            }
+
+            if (longitude < 0)
+            {
+                lonHemisphere = 'W';
+                longitude *= -1.0;
+            }
+            else
+            {
+                lonHemisphere = 'E';
+            }
+
+            latMinutes = fmod(latitude * 60.0 , 60.0);
+            lonMinutes = fmod(longitude * 60.0 , 60.0);
+
+            length = snprintf(pMarker, lengthRemaining, "%02d%09.6lf,%c,%03d%09.6lf,%c,",
+                              (uint8_t)floor(latitude), latMinutes, latHemisphere,
+                              (uint8_t)floor(longitude),lonMinutes, lonHemisphere);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining,",,,,");
+        }
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        length = snprintf(pMarker, lengthRemaining, "%s,", gnsModeIndicator);
+
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_DOP) {
+            length = snprintf(pMarker, lengthRemaining, "%02d,%.1f,",
+                              svUsedCount, locationExtended.hdop);
+        }
+        else {   // no hdop
+            length = snprintf(pMarker, lengthRemaining, "%02d,,",
+                              svUsedCount);
+        }
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_ALTITUDE_MEAN_SEA_LEVEL)
+        {
+            length = snprintf(pMarker, lengthRemaining, "%.1lf,",
+                              locationExtended.altitudeMeanSeaLevel);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining,",");
+        }
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if ((location.gpsLocation.flags & LOC_GPS_LOCATION_HAS_ALTITUDE) &&
+            (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_ALTITUDE_MEAN_SEA_LEVEL))
+        {
+            length = snprintf(pMarker, lengthRemaining, "%.1lf,",
+                              ref_lla.alt - locationExtended.altitudeMeanSeaLevel);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining, ",");
+        }
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_DGNSS_DATA_AGE)
+        {
+            length = snprintf(pMarker, lengthRemaining, "%.1f,",
+                              (float)locationExtended.dgnssDataAgeMsec / 1000);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining, ",");
+        }
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_DGNSS_REF_STATION_ID)
+        {
+            length = snprintf(pMarker, lengthRemaining, "%04d",
+                              locationExtended.dgnssRefStationId);
+            if (length < 0 || length >= lengthRemaining)
+            {
+                LOC_LOGE("NMEA Error in string formatting");
+                return;
+            }
+            pMarker += length;
+            lengthRemaining -= length;
+        }
+
+        // hardcode Navigation Status field to 'V'
+        length = snprintf(pMarker, lengthRemaining, ",%c", 'V');
+        pMarker += length;
+        lengthRemaining -= length;
+
+        length = loc_nmea_put_checksum(sentence_GNS, sizeof(sentence_GNS), false);
+
+        // -------------------
+        // ------$--GGA-------
+        // -------------------
+
+        pMarker = sentence_GGA;
+        lengthRemaining = sizeof(sentence_GGA);
+
+        length = snprintf(pMarker, lengthRemaining, "$%sGGA,%02d%02d%02d.%02d," ,
+                          talker, utcHours, utcMinutes, utcSeconds, utcMSeconds/10);
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (location.gpsLocation.flags & LOC_GPS_LOCATION_HAS_LAT_LONG)
+        {
+            double latitude = ref_lla.lat;
+            double longitude = ref_lla.lon;
+            char latHemisphere;
+            char lonHemisphere;
+            double latMinutes;
+            double lonMinutes;
+
+            if (latitude > 0)
+            {
+                latHemisphere = 'N';
+            }
+            else
+            {
+                latHemisphere = 'S';
+                latitude *= -1.0;
+            }
+
+            if (longitude < 0)
+            {
+                lonHemisphere = 'W';
+                longitude *= -1.0;
+            }
+            else
+            {
+                lonHemisphere = 'E';
+            }
+
+            latMinutes = fmod(latitude * 60.0 , 60.0);
+            lonMinutes = fmod(longitude * 60.0 , 60.0);
+
+            length = snprintf(pMarker, lengthRemaining, "%02d%09.6lf,%c,%03d%09.6lf,%c,",
+                              (uint8_t)floor(latitude), latMinutes, latHemisphere,
+                              (uint8_t)floor(longitude),lonMinutes, lonHemisphere);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining,",,,,");
+        }
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        // Number of satellites in use, 00-12
+        if (svUsedCount > MAX_SATELLITES_IN_USE)
+            svUsedCount = MAX_SATELLITES_IN_USE;
+        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_DOP)
+        {
+            length = snprintf(pMarker, lengthRemaining, "%s,%02d,%.1f,",
+                              ggaGpsQuality, svUsedCount, locationExtended.hdop);
+        }
+        else
+        {   // no hdop
+            length = snprintf(pMarker, lengthRemaining, "%s,%02d,,",
+                              ggaGpsQuality, svUsedCount);
+        }
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_ALTITUDE_MEAN_SEA_LEVEL)
+        {
+            length = snprintf(pMarker, lengthRemaining, "%.1lf,M,",
+                              locationExtended.altitudeMeanSeaLevel);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining,",,");
+        }
+
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if ((location.gpsLocation.flags & LOC_GPS_LOCATION_HAS_ALTITUDE) &&
+            (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_ALTITUDE_MEAN_SEA_LEVEL))
+        {
+            length = snprintf(pMarker, lengthRemaining, "%.1lf,M,",
+                              ref_lla.alt - locationExtended.altitudeMeanSeaLevel);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining, ",,");
+        }
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_DGNSS_DATA_AGE)
+        {
+            length = snprintf(pMarker, lengthRemaining, "%.1f,",
+                              (float)locationExtended.dgnssDataAgeMsec / 1000);
+        }
+        else
+        {
+            length = snprintf(pMarker, lengthRemaining, ",");
+        }
+        if (length < 0 || length >= lengthRemaining)
+        {
+            LOC_LOGE("NMEA Error in string formatting");
+            return;
+        }
+        pMarker += length;
+        lengthRemaining -= length;
+
+        if (locationExtended.flags & GPS_LOCATION_EXTENDED_HAS_DGNSS_REF_STATION_ID)
+        {
+            length = snprintf(pMarker, lengthRemaining, "%04d",
+                              locationExtended.dgnssRefStationId);
+            if (length < 0 || length >= lengthRemaining)
+            {
+                LOC_LOGE("NMEA Error in string formatting");
+                return;
+            }
+            pMarker += length;
+            lengthRemaining -= length;
+        }
+
+        length = loc_nmea_put_checksum(sentence_GGA, sizeof(sentence_GGA), false);
+
+        // ------$--DTM-------
+        nmeaArraystr.push_back(sentence_DTM);
+        // ------$--RMC-------
+        nmeaArraystr.push_back(sentence_RMC);
+        if(LOC_GNSS_DATUM_PZ90 == datum_type) {
+            // ------$--DTM-------
+            nmeaArraystr.push_back(sentence_DTM);
+        }
+        // ------$--GNS-------
+        nmeaArraystr.push_back(sentence_GNS);
+        if(LOC_GNSS_DATUM_PZ90 == datum_type) {
+            // ------$--DTM-------
+            nmeaArraystr.push_back(sentence_DTM);
+        }
+        // ------$--GGA-------
+        nmeaArraystr.push_back(sentence_GGA);
+        indexOfGGA = static_cast<int>(nmeaArraystr.size() - 1);
+    }
+    //Send blank NMEA reports for non-final fixes
+    else {
+        strlcpy(sentence, "$GPGSA,A,1,,,,,,,,,,,,,,,,", sizeof(sentence));
+        length = loc_nmea_put_checksum(sentence, sizeof(sentence), false);
+        nmeaArraystr.push_back(sentence);
+
+        strlcpy(sentence, "$GPVTG,,T,,M,,N,,K,N", sizeof(sentence));
+        length = loc_nmea_put_checksum(sentence, sizeof(sentence), false);
+        nmeaArraystr.push_back(sentence);
+
+        strlcpy(sentence, "$GPDTM,,,,,,,,", sizeof(sentence));
+        length = loc_nmea_put_checksum(sentence, sizeof(sentence), false);
+        nmeaArraystr.push_back(sentence);
+
+        strlcpy(sentence, "$GPRMC,,V,,,,,,,,,,N,V", sizeof(sentence));
+        length = loc_nmea_put_checksum(sentence, sizeof(sentence), false);
+        nmeaArraystr.push_back(sentence);
+
+        strlcpy(sentence, "$GPGNS,,,,,,N,,,,,,,V", sizeof(sentence));
+        length = loc_nmea_put_checksum(sentence, sizeof(sentence), false);
+        nmeaArraystr.push_back(sentence);
+
+        strlcpy(sentence, "$GPGGA,,,,,,0,,,,,,,,", sizeof(sentence));
+        length = loc_nmea_put_checksum(sentence, sizeof(sentence), false);
+        nmeaArraystr.push_back(sentence);
+    }
+
+    EXIT_LOG(%d, 0);
+}
+
+
+
+/*===========================================================================
+FUNCTION    loc_nmea_generate_sv
+
+DESCRIPTION
+   Generate NMEA sentences generated based on sv report
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   0
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+void loc_nmea_generate_sv(const GnssSvNotification &svNotify,
+                              std::vector<std::string> &nmeaArraystr)
+{
+    ENTRY_LOG();
+
+    char sentence[NMEA_SENTENCE_MAX_LENGTH] = {0};
+    loc_sv_cache_info sv_cache_info = {};
+
+    //Count GPS SVs for saparating GPS from GLONASS and throw others
+    for (uint32_t svOffset = 0; svOffset < svNotify.count; svOffset++) {
+        if ((GNSS_SV_TYPE_GPS == svNotify.gnssSvs[svOffset].type) ||
+            (GNSS_SV_TYPE_SBAS == svNotify.gnssSvs[svOffset].type))
+        {
+            if (GNSS_SIGNAL_GPS_L5 == svNotify.gnssSvs[svOffset].gnssSignalTypeMask) {
+                sv_cache_info.gps_l5_count++;
+            } else if (GNSS_SIGNAL_GPS_L2 == svNotify.gnssSvs[svOffset].gnssSignalTypeMask) {
+                sv_cache_info.gps_l2_count++;
+            } else {
+                // GNSS_SIGNAL_GPS_L1CA, GNSS_SIGNAL_SBAS_L1 or default
+                // If no signal type in report, it means default L1
+                sv_cache_info.gps_l1_count++;
+            }
+        }
+        else if (GNSS_SV_TYPE_GLONASS == svNotify.gnssSvs[svOffset].type)
+        {
+            if (GNSS_SIGNAL_GLONASS_G2 == svNotify.gnssSvs[svOffset].gnssSignalTypeMask){
+                sv_cache_info.glo_g2_count++;
+            } else {
+                // GNSS_SIGNAL_GLONASS_G1 or default
+                // If no signal type in report, it means default G1
+                sv_cache_info.glo_g1_count++;
+            }
+        }
+        else if (GNSS_SV_TYPE_GALILEO == svNotify.gnssSvs[svOffset].type)
+        {
+            if(GNSS_SIGNAL_GALILEO_E5A == svNotify.gnssSvs[svOffset].gnssSignalTypeMask){
+                sv_cache_info.gal_e5_count++;
+            } else if (GNSS_SIGNAL_GALILEO_E5B == svNotify.gnssSvs[svOffset].gnssSignalTypeMask) {
+                sv_cache_info.gal_e5b_count++;
+            } else {
+                // GNSS_SIGNAL_GALILEO_E1 or default
+                // If no signal type in report, it means default E1
+                sv_cache_info.gal_e1_count++;
+            }
+        }
+        else if (GNSS_SV_TYPE_QZSS == svNotify.gnssSvs[svOffset].type)
+        {
+            if (GNSS_SIGNAL_QZSS_L5 == svNotify.gnssSvs[svOffset].gnssSignalTypeMask) {
+                sv_cache_info.qzss_l5_count++;
+            } else if (GNSS_SIGNAL_QZSS_L2 == svNotify.gnssSvs[svOffset].gnssSignalTypeMask) {
+                sv_cache_info.qzss_l2_count++;
+            } else {
+                // GNSS_SIGNAL_QZSS_L1CA or default
+                // If no signal type in report, it means default L1
+                sv_cache_info.qzss_l1_count++;
+            }
+        }
+        else if (GNSS_SV_TYPE_BEIDOU == svNotify.gnssSvs[svOffset].type)
+        {
+            // cache the used in fix mask, as it will be needed to send $PQGSA
+            // during the position report
+            if (GNSS_SV_OPTIONS_USED_IN_FIX_BIT ==
+                (svNotify.gnssSvs[svOffset].gnssSvOptionsMask &
+                  GNSS_SV_OPTIONS_USED_IN_FIX_BIT))
+            {
+                setSvMask(sv_cache_info.bds_used_mask, svNotify.gnssSvs[svOffset].svId);
+            }
+            if ((GNSS_SIGNAL_BEIDOU_B2AI == svNotify.gnssSvs[svOffset].gnssSignalTypeMask) ||
+                   (GNSS_SIGNAL_BEIDOU_B2AQ == svNotify.gnssSvs[svOffset].gnssSignalTypeMask)) {
+                sv_cache_info.bds_b2_count++;
+            } else if (GNSS_SIGNAL_BEIDOU_B1C == svNotify.gnssSvs[svOffset].gnssSignalTypeMask) {
+                sv_cache_info.bds_b1c_count++;
+            } else {
+                // GNSS_SIGNAL_BEIDOU_B1I or default
+                // If no signal type in report, it means default B1I
+                sv_cache_info.bds_b1i_count++;
+            }
+        }
+        else if (GNSS_SV_TYPE_NAVIC == svNotify.gnssSvs[svOffset].type)
+        {
+            // GNSS_SIGNAL_NAVIC_L5 is the only signal type for NAVIC
+            sv_cache_info.navic_l5_count++;
+        }
+    }
+
+    loc_nmea_sv_meta sv_meta;
+    // ---------------------
+    // ------$GPGSV:L1CA----
+    // ---------------------
+
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_GPS,
+            GNSS_SIGNAL_GPS_L1CA, false), nmeaArraystr);
+
+    // ---------------------
+    // ------$GPGSV:L5------
+    // ---------------------
+
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_GPS,
+            GNSS_SIGNAL_GPS_L5, false), nmeaArraystr);
+
+    // ---------------------
+    // ------$GPGSV:L2------
+    // ---------------------
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_GPS,
+            GNSS_SIGNAL_GPS_L2, false), nmeaArraystr);
+
+    // ---------------------
+    // ------$GLGSV:G1------
+    // ---------------------
+
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_GLONASS,
+            GNSS_SIGNAL_GLONASS_G1, false), nmeaArraystr);
+
+    // ---------------------
+    // ------$GLGSV:G2------
+    // ---------------------
+
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_GLONASS,
+            GNSS_SIGNAL_GLONASS_G2, false), nmeaArraystr);
+
+    // ---------------------
+    // ------$GAGSV:E1------
+    // ---------------------
+
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_GALILEO,
+            GNSS_SIGNAL_GALILEO_E1, false), nmeaArraystr);
+
+    // -------------------------
+    // ------$GAGSV:E5A---------
+    // -------------------------
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_GALILEO,
+            GNSS_SIGNAL_GALILEO_E5A, false), nmeaArraystr);
+
+    // -------------------------
+    // ------$GAGSV:E5B---------
+    // -------------------------
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_GALILEO,
+            GNSS_SIGNAL_GALILEO_E5B, false), nmeaArraystr);
+
+    // -----------------------------
+    // ------$GQGSV (QZSS):L1CA-----
+    // -----------------------------
+
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_QZSS,
+            GNSS_SIGNAL_QZSS_L1CA, false), nmeaArraystr);
+
+    // -----------------------------
+    // ------$GQGSV (QZSS):L5-------
+    // -----------------------------
+
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_QZSS,
+            GNSS_SIGNAL_QZSS_L5, false), nmeaArraystr);
+
+    // -----------------------------
+    // ------$GQGSV (QZSS):L2-------
+    // -----------------------------
+
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_QZSS,
+            GNSS_SIGNAL_QZSS_L2, false), nmeaArraystr);
+
+
+    // -----------------------------
+    // ------$GBGSV (BEIDOU:B1I)----
+    // -----------------------------
+
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_BEIDOU,
+            GNSS_SIGNAL_BEIDOU_B1I, false), nmeaArraystr);
+
+    // -----------------------------
+    // ------$GBGSV (BEIDOU:B1C)----
+    // -----------------------------
+
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_BEIDOU,
+            GNSS_SIGNAL_BEIDOU_B1C, false), nmeaArraystr);
+
+    // -----------------------------
+    // ------$GBGSV (BEIDOU:B2AI)---
+    // -----------------------------
+
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_BEIDOU,
+            GNSS_SIGNAL_BEIDOU_B2AI, false), nmeaArraystr);
+
+    // -----------------------------
+    // ------$GIGSV (NAVIC:L5)------
+    // -----------------------------
+
+    loc_nmea_generate_GSV(svNotify, sentence, sizeof(sentence),
+            loc_nmea_sv_meta_init(sv_meta, sv_cache_info, GNSS_SV_TYPE_NAVIC,
+            GNSS_SIGNAL_NAVIC_L5,false), nmeaArraystr);
+
+    EXIT_LOG(%d, 0);
+}
diff --git a/gps/utils/loc_nmea.h b/gps/utils/loc_nmea.h
new file mode 100644
index 0000000..2d98f42
--- /dev/null
+++ b/gps/utils/loc_nmea.h
@@ -0,0 +1,95 @@
+/* Copyright (c) 2012-2013, 2015-2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef LOC_ENG_NMEA_H
+#define LOC_ENG_NMEA_H
+
+#include <gps_extended.h>
+#include <vector>
+#include <string>
+#define NMEA_SENTENCE_MAX_LENGTH 200
+
+/** gnss datum type */
+#define LOC_GNSS_DATUM_WGS84          0
+#define LOC_GNSS_DATUM_PZ90           1
+
+/* len of semi major axis of ref ellips*/
+#define MAJA               (6378137.0)
+/* flattening coef of ref ellipsoid*/
+#define FLAT               (1.0/298.2572235630)
+/* 1st eccentricity squared*/
+#define ESQR               (FLAT*(2.0 - FLAT))
+/*1 minus eccentricity squared*/
+#define OMES               (1.0 - ESQR)
+#define MILARCSEC2RAD      (4.848136811095361e-09)
+/*semi major axis */
+#define C_PZ90A            (6378136.0)
+/*semi minor axis */
+#define C_PZ90B            (6356751.3618)
+/* Transformation from WGS84 to PZ90
+ * Cx,Cy,Cz,Rs,Rx,Ry,Rz,C_SYS_A,C_SYS_B*/
+const double DatumConstFromWGS84[9] =
+        {+0.003, +0.001, 0.000, (1.0+(0.000*1E-6)), (-0.019*MILARCSEC2RAD),
+        (+0.042*MILARCSEC2RAD), (-0.002*MILARCSEC2RAD), C_PZ90A, C_PZ90B};
+
+/** Represents a LTP*/
+typedef struct {
+    double     lat;
+    double     lon;
+    double     alt;
+} LocLla;
+
+/** Represents a ECEF*/
+typedef struct {
+    double     X;
+    double     Y;
+    double     Z;
+} LocEcef;
+
+void loc_nmea_generate_sv(const GnssSvNotification &svNotify,
+                              std::vector<std::string> &nmeaArraystr);
+
+void loc_nmea_generate_pos(const UlpLocation &location,
+                               const GpsLocationExtended &locationExtended,
+                               const LocationSystemInfo &systemInfo,
+                               unsigned char generate_nmea,
+                               bool custom_gga_fix_quality,
+                               std::vector<std::string> &nmeaArraystr,
+                               int& indexOfGGA,
+                               bool isTagBlockGroupingEnabled);
+
+#define DEBUG_NMEA_MINSIZE 6
+#define DEBUG_NMEA_MAXSIZE 4096
+inline bool loc_nmea_is_debug(const char* nmea, int length) {
+    return ((nullptr != nmea) &&
+            (length >= DEBUG_NMEA_MINSIZE) && (length <= DEBUG_NMEA_MAXSIZE) &&
+            (nmea[0] == '$') && (nmea[1] == 'P') && (nmea[2] == 'Q') && (nmea[3] == 'W'));
+}
+
+#endif // LOC_ENG_NMEA_H
diff --git a/gps/utils/loc_target.cpp b/gps/utils/loc_target.cpp
new file mode 100644
index 0000000..3ee42e6
--- /dev/null
+++ b/gps/utils/loc_target.cpp
@@ -0,0 +1,249 @@
+/* Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <log_util.h>
+#include "loc_target.h"
+#include "loc_log.h"
+#include <loc_pla.h>
+
+#define APQ8064_ID_1 "109"
+#define APQ8064_ID_2 "153"
+#define MPQ8064_ID_1 "130"
+#define MSM8930_ID_1 "142"
+#define MSM8930_ID_2 "116"
+#define APQ8030_ID_1 "157"
+#define APQ8074_ID_1 "184"
+
+#define LINE_LEN 100
+#define STR_LIQUID      "Liquid"
+#define STR_SURF        "Surf"
+#define STR_MTP         "MTP"
+#define STR_APQ         "apq"
+#define STR_SDC         "sdc"  // alternative string for APQ targets
+#define STR_QCS         "qcs"  // string for Gen9 APQ targets
+#define STR_MSM         "msm"
+#define STR_SDM         "sdm"  // alternative string for MSM targets
+#define STR_APQ_NO_WGR  "baseband_apq_nowgr"
+#define STR_AUTO        "auto"
+#define IS_STR_END(c) ((c) == '\0' || (c) == '\n' || (c) == '\r')
+#define LENGTH(s) (sizeof(s) - 1)
+#define GPS_CHECK_NO_ERROR 0
+#define GPS_CHECK_NO_GPS_HW 1
+
+static unsigned int gTarget = (unsigned int)-1;
+
+static int read_a_line(const char * file_path, char * line, int line_size)
+{
+    FILE *fp;
+    int result = 0;
+
+    * line = '\0';
+    fp = fopen(file_path, "r" );
+    if( fp == NULL ) {
+        LOC_LOGE("open failed: %s: %s\n", file_path, strerror(errno));
+        result = -1;
+    } else {
+        int len;
+        fgets(line, line_size, fp);
+        len = strlen(line);
+        while ('\n' == line[len-1]) {
+            // If there is a new line at end of string, replace it with NULL
+            line[len-1] = '\0';
+            len--;
+        }
+        len = len < line_size - 1? len : line_size - 1;
+        line[len] = '\0';
+        LOC_LOGD("cat %s: %s", file_path, line);
+        fclose(fp);
+    }
+    return result;
+}
+
+/*The character array passed to this function should have length
+  of atleast PROPERTY_VALUE_MAX*/
+void loc_get_target_baseband(char *baseband, int array_length)
+{
+    if(baseband && (array_length >= PROPERTY_VALUE_MAX)) {
+        property_get("ro.baseband", baseband, "");
+        LOC_LOGD("%s:%d]: Baseband: %s\n", __func__, __LINE__, baseband);
+    }
+    else {
+        LOC_LOGE("%s:%d]: NULL parameter or array length less than PROPERTY_VALUE_MAX\n",
+                 __func__, __LINE__);
+    }
+}
+
+/*The character array passed to this function should have length
+  of atleast PROPERTY_VALUE_MAX*/
+void loc_get_platform_name(char *platform_name, int array_length)
+{
+    if(platform_name && (array_length >= PROPERTY_VALUE_MAX)) {
+        property_get("ro.board.platform", platform_name, "");
+        LOC_LOGD("%s:%d]: Target name: %s\n", __func__, __LINE__, platform_name);
+    }
+    else {
+        LOC_LOGE("%s:%d]: Null parameter or array length less than PROPERTY_VALUE_MAX\n",
+                 __func__, __LINE__);
+    }
+}
+
+/*The character array passed to this function should have length
+  of atleast PROPERTY_VALUE_MAX*/
+void loc_get_auto_platform_name(char *platform_name, int array_length)
+{
+    if(platform_name && (array_length >= PROPERTY_VALUE_MAX)) {
+        property_get("ro.hardware.type", platform_name, "");
+        LOC_LOGD("%s:%d]: Autoplatform name: %s\n", __func__, __LINE__, platform_name);
+    }
+    else {
+        LOC_LOGE("%s:%d]: Null parameter or array length less than PROPERTY_VALUE_MAX\n",
+                 __func__, __LINE__);
+    }
+}
+
+/*Reads the property ro.config.low_ram to identify if this is a low ram target
+  Returns:
+  0 if not a low ram target
+  1 if this is a low ram target
+*/
+int loc_identify_low_ram_target()
+{
+    int ret = 0;
+    char low_ram_target[PROPERTY_VALUE_MAX];
+    property_get("ro.config.low_ram", low_ram_target, "");
+    LOC_LOGd("low ram target: %s\n", low_ram_target);
+    return !(strncmp(low_ram_target, "true", PROPERTY_VALUE_MAX));
+}
+
+/*The character array passed to this function should have length
+  of atleast PROPERTY_VALUE_MAX*/
+/* Reads the soc_id node and return the soc_id value */
+void loc_get_device_soc_id(char *soc_id_value, int array_length)
+{
+    static const char soc_id[]     = "/sys/devices/soc0/soc_id";
+    static const char soc_id_dep[] = "/sys/devices/system/soc/soc0/id";
+    int return_val = 0;
+
+    if (soc_id_value && (array_length >= PROPERTY_VALUE_MAX)) {
+        if (!access(soc_id, F_OK)) {
+            return_val = read_a_line(soc_id, soc_id_value, array_length);
+        } else {
+            return_val = read_a_line(soc_id_dep, soc_id_value, array_length);
+        }
+        if (0 == return_val) {
+            LOC_LOGd("SOC Id value: %s\n", soc_id_value);
+        } else {
+            LOC_LOGe("Unable to read the soc_id value\n");
+        }
+    } else {
+        LOC_LOGe("Null parameter or array length less than PROPERTY_VALUE_MAX\n");
+    }
+}
+
+unsigned int loc_get_target(void)
+{
+    if (gTarget != (unsigned int)-1)
+        return gTarget;
+
+    static const char hw_platform[]      = "/sys/devices/soc0/hw_platform";
+    static const char hw_platform_dep[]  =
+        "/sys/devices/system/soc/soc0/hw_platform";
+    static const char mdm[]              = "/target"; // mdm target we are using
+
+    char rd_hw_platform[LINE_LEN];
+    char rd_id[LINE_LEN];
+    char rd_mdm[LINE_LEN];
+    char baseband[LINE_LEN];
+    char rd_auto_platform[LINE_LEN];
+
+    loc_get_target_baseband(baseband, sizeof(baseband));
+
+    if (!access(hw_platform, F_OK)) {
+        read_a_line(hw_platform, rd_hw_platform, LINE_LEN);
+    } else {
+        read_a_line(hw_platform_dep, rd_hw_platform, LINE_LEN);
+    }
+    // Get the soc-id for this device.
+    loc_get_device_soc_id(rd_id, sizeof(rd_id));
+
+    /*check automotive platform*/
+    loc_get_auto_platform_name(rd_auto_platform, sizeof(rd_auto_platform));
+    if( !memcmp(rd_auto_platform, STR_AUTO, LENGTH(STR_AUTO)) )
+    {
+          gTarget = TARGET_AUTO;
+          goto detected;
+    }
+
+    if( !memcmp(baseband, STR_APQ_NO_WGR, LENGTH(STR_APQ_NO_WGR)) ){
+
+        gTarget = TARGET_NO_GNSS;
+        goto detected;
+    }
+
+    if( !memcmp(baseband, STR_APQ, LENGTH(STR_APQ)) ||
+        !memcmp(baseband, STR_SDC, LENGTH(STR_SDC)) ||
+        !memcmp(baseband, STR_QCS, LENGTH(STR_QCS)) ) {
+
+        if( !memcmp(rd_id, MPQ8064_ID_1, LENGTH(MPQ8064_ID_1))
+            && IS_STR_END(rd_id[LENGTH(MPQ8064_ID_1)]) )
+            gTarget = TARGET_NO_GNSS;
+        else
+            gTarget = TARGET_APQ_SA;
+    } else if (((!memcmp(rd_hw_platform, STR_LIQUID, LENGTH(STR_LIQUID))
+                 && IS_STR_END(rd_hw_platform[LENGTH(STR_LIQUID)])) ||
+                (!memcmp(rd_hw_platform, STR_SURF,   LENGTH(STR_SURF))
+                 && IS_STR_END(rd_hw_platform[LENGTH(STR_SURF)])) ||
+                (!memcmp(rd_hw_platform, STR_MTP,   LENGTH(STR_MTP))
+                 && IS_STR_END(rd_hw_platform[LENGTH(STR_MTP)]))) &&
+               !read_a_line( mdm, rd_mdm, LINE_LEN)) {
+        gTarget = TARGET_MDM;
+    } else if( (!memcmp(rd_id, MSM8930_ID_1, LENGTH(MSM8930_ID_1))
+                && IS_STR_END(rd_id[LENGTH(MSM8930_ID_1)])) ||
+               (!memcmp(rd_id, MSM8930_ID_2, LENGTH(MSM8930_ID_2))
+                && IS_STR_END(rd_id[LENGTH(MSM8930_ID_2)])) ) {
+        gTarget = TARGET_MSM_NO_SSC;
+    } else if ( !memcmp(baseband, STR_MSM, LENGTH(STR_MSM)) ||
+                !memcmp(baseband, STR_SDM, LENGTH(STR_SDM)) ) {
+        gTarget = TARGET_DEFAULT;
+    } else {
+        gTarget = TARGET_UNKNOWN;
+    }
+
+detected:
+    LOC_LOGW("HAL: %s returned %d", __FUNCTION__, gTarget);
+    return gTarget;
+}
diff --git a/gps/utils/loc_target.h b/gps/utils/loc_target.h
new file mode 100644
index 0000000..2dcd895
--- /dev/null
+++ b/gps/utils/loc_target.h
@@ -0,0 +1,82 @@
+/* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#ifndef LOC_TARGET_H
+#define LOC_TARGET_H
+#define TARGET_SET(gnss,ssc) ( (gnss<<1)|ssc )
+#define TARGET_DEFAULT       TARGET_SET(GNSS_MSM, HAS_SSC)
+#define TARGET_MDM           TARGET_SET(GNSS_MDM, HAS_SSC)
+#define TARGET_APQ_SA        TARGET_SET(GNSS_GSS, NO_SSC)
+#define TARGET_NO_GNSS       TARGET_SET(GNSS_NONE, NO_SSC)
+#define TARGET_MSM_NO_SSC    TARGET_SET(GNSS_MSM, NO_SSC)
+#define TARGET_AUTO          TARGET_SET(GNSS_AUTO, NO_SSC)
+#define TARGET_UNKNOWN       TARGET_SET(GNSS_UNKNOWN, NO_SSC)
+#define getTargetGnssType(target)  (target>>1)
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+unsigned int loc_get_target(void);
+
+/*The character array passed to this function should have length
+  of atleast PROPERTY_VALUE_MAX*/
+void loc_get_target_baseband(char *baseband, int array_length);
+/*The character array passed to this function should have length
+  of atleast PROPERTY_VALUE_MAX*/
+void loc_get_platform_name(char *platform_name, int array_length);
+/*The character array passed to this function should have length
+  of atleast PROPERTY_VALUE_MAX*/
+void loc_get_auto_platform_name(char *platform_name, int array_length);
+int loc_identify_low_ram_target();
+/*The character array passed to this function should have length
+  of atleast PROPERTY_VALUE_MAX*/
+void loc_get_device_soc_id(char *soc_id_value, int array_length);
+
+/* Please remember to update 'target_name' in loc_log.cpp,
+   if do any changes to this enum. */
+typedef enum {
+    GNSS_NONE = 0,
+    GNSS_MSM,
+    GNSS_GSS,
+    GNSS_MDM,
+    GNSS_AUTO,
+    GNSS_UNKNOWN
+}GNSS_TARGET;
+
+typedef enum {
+    NO_SSC = 0,
+    HAS_SSC
+}SSC_TYPE;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*LOC_TARGET_H*/
diff --git a/gps/utils/loc_timer.h b/gps/utils/loc_timer.h
new file mode 100644
index 0000000..fff0c46
--- /dev/null
+++ b/gps/utils/loc_timer.h
@@ -0,0 +1,74 @@
+/* Copyright (c) 2013,2015 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __LOC_DELAY_H__
+#define __LOC_DELAY_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#include <stddef.h>
+#include <stdint.h>
+#include <loc_pla.h>
+/*
+    user_data: client context pointer, passthrough. Originally received
+               from calling client when loc_timer_start() is called.
+    result:    0 if timer successfully timed out; else timer failed.
+*/
+typedef void (*loc_timer_callback)(void *user_data, int32_t result);
+
+
+/*
+    delay_msec:         timeout value for the timer.
+    cb_func:            callback function pointer, implemented by client.
+                        Can not be NULL.
+    user_data:          client context pointer, passthrough.  Will be
+                        returned when loc_timer_callback() is called.
+    wakeOnExpire:       true if to wake up CPU (if sleeping) upon timer
+                                expiration and notify the client.
+                        false if to wait until next time CPU wakes up (if
+                                 sleeping) and then notify the client.
+    Returns the handle, which can be used to stop the timer
+                        NULL, if timer start fails (e.g. if cb_func is NULL).
+*/
+void* loc_timer_start(uint64_t delay_msec,
+                      loc_timer_callback cb_func,
+                      void *user_data,
+                      bool wake_on_expire=false);
+
+/*
+    handle becomes invalid upon the return of the callback
+*/
+void loc_timer_stop(void*& handle);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif //__LOC_DELAY_H__
diff --git a/gps/utils/log_util.h b/gps/utils/log_util.h
new file mode 100644
index 0000000..33aa6e2
--- /dev/null
+++ b/gps/utils/log_util.h
@@ -0,0 +1,291 @@
+/* Copyright (c) 2011-2014, 2020 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __LOG_UTIL_H__
+#define __LOG_UTIL_H__
+
+#include <stdbool.h>
+#include <loc_pla.h>
+#if defined (USE_ANDROID_LOGGING) || defined (ANDROID)
+// Android and LE targets with logcat support
+#include <utils/Log.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+#elif defined (USE_GLIB)
+// LE targets with no logcat support
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+#ifndef LOG_TAG
+#define LOG_TAG "GPS_UTILS"
+#endif /* LOG_TAG */
+
+// LE targets with no logcat support
+#if defined(FEATURE_EXTERNAL_AP) || defined(USE_SYSLOG_LOGGING)
+#include <syslog.h>
+#define ALOGE(...) syslog(LOG_ERR,     "LOC_LOGE: " __VA_ARGS__);
+#define ALOGW(...) syslog(LOG_WARNING, "LOC_LOGW: " __VA_ARGS__);
+#define ALOGI(...) syslog(LOG_NOTICE,  "LOC_LOGI: " __VA_ARGS__);
+#define ALOGD(...) syslog(LOG_DEBUG,   "LOC_LOGD: " __VA_ARGS__);
+#define ALOGV(...) syslog(LOG_NOTICE,  "LOC_LOGV: " __VA_ARGS__);
+#else /* FEATURE_EXTERNAL_AP */
+#define TS_PRINTF(format, x...)                                  \
+{                                                                \
+    struct timeval tv;                                           \
+    struct timezone tz;                                          \
+    int hh, mm, ss;                                              \
+    gettimeofday(&tv, &tz);                                      \
+    hh = tv.tv_sec/3600%24;                                      \
+    mm = (tv.tv_sec%3600)/60;                                    \
+    ss = tv.tv_sec%60;                                           \
+    fprintf(stdout,"%02d:%02d:%02d.%06ld]" format "\n", hh, mm, ss, tv.tv_usec, ##x);    \
+}
+
+#define ALOGE(format, x...) TS_PRINTF("E/%s (%d): " format , LOG_TAG, getpid(), ##x)
+#define ALOGW(format, x...) TS_PRINTF("W/%s (%d): " format , LOG_TAG, getpid(), ##x)
+#define ALOGI(format, x...) TS_PRINTF("I/%s (%d): " format , LOG_TAG, getpid(), ##x)
+#define ALOGD(format, x...) TS_PRINTF("D/%s (%d): " format , LOG_TAG, getpid(), ##x)
+#define ALOGV(format, x...) TS_PRINTF("V/%s (%d): " format , LOG_TAG, getpid(), ##x)
+#endif /* FEATURE_EXTERNAL_AP */
+
+#endif /* #if defined (USE_ANDROID_LOGGING) || defined (ANDROID) */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+/*=============================================================================
+ *
+ *                         LOC LOGGER TYPE DECLARATION
+ *
+ *============================================================================*/
+/* LOC LOGGER */
+typedef struct loc_logger_s
+{
+  unsigned long  DEBUG_LEVEL;
+  unsigned long  TIMESTAMP;
+  bool           LOG_BUFFER_ENABLE;
+} loc_logger_s_type;
+
+
+/*=============================================================================
+ *
+ *                               EXTERNAL DATA
+ *
+ *============================================================================*/
+
+// Logging Improvements
+extern const char *loc_logger_boolStr[];
+
+extern loc_logger_s_type loc_logger;
+extern const char *boolStr[];
+extern const char VOID_RET[];
+extern const char FROM_AFW[];
+extern const char TO_MODEM[];
+extern const char FROM_MODEM[];
+extern const char TO_AFW[];
+extern const char EXIT_TAG[];
+extern const char ENTRY_TAG[];
+extern const char EXIT_ERROR_TAG[];
+
+#define BUILD_TYPE_PROP_NA 0
+#define BUILD_TYPE_PROP_USER 1
+#define BUILD_TYPE_PROP_USERDEBUG 2
+#define BUILD_TYPE_PROP_INVALID 3
+extern int build_type_prop;
+
+/*=============================================================================
+ *
+ *                        MODULE EXPORTED FUNCTIONS
+ *
+ *============================================================================*/
+inline void loc_logger_init(unsigned long debug, unsigned long timestamp)
+{
+    loc_logger.DEBUG_LEVEL = debug;
+
+    if (BUILD_TYPE_PROP_NA == build_type_prop) {
+        char value[PROPERTY_VALUE_MAX] = "NA";
+        property_get("ro.build.type", value, "userdebug");
+        if (0 == strcmp(value, "user")) {
+            build_type_prop = BUILD_TYPE_PROP_USER;
+        } else if (0 == strcmp(value, "userdebug")) {
+            build_type_prop = BUILD_TYPE_PROP_USERDEBUG;
+        } else {
+            build_type_prop = BUILD_TYPE_PROP_INVALID;
+        }
+    }
+
+    if (BUILD_TYPE_PROP_USER == build_type_prop) {
+        // force user builds to 2 or less
+        if (loc_logger.DEBUG_LEVEL > 2) {
+            loc_logger.DEBUG_LEVEL = 2;
+        }
+     }
+
+    loc_logger.TIMESTAMP = timestamp;
+}
+
+inline void log_buffer_init(bool enabled) {
+    loc_logger.LOG_BUFFER_ENABLE = enabled;
+}
+extern void log_tag_level_map_init();
+extern int get_tag_log_level(const char* tag);
+extern char* get_timestamp(char* str, unsigned long buf_size);
+extern void log_buffer_insert(char *str, unsigned long buf_size, int level);
+/*=============================================================================
+ *
+ *                          LOGGING BUFFER MACROS
+ *
+ *============================================================================*/
+#ifndef LOG_NDEBUG
+#define LOG_NDEBUG 0
+#endif
+#define TOTAL_LOG_LEVELS 5
+#define LOGGING_BUFFER_MAX_LEN 1024
+#define IF_LOG_BUFFER_ENABLE if (loc_logger.LOG_BUFFER_ENABLE)
+#define INSERT_BUFFER(flag, level, format, x...)                                              \
+{                                                                                             \
+    IF_LOG_BUFFER_ENABLE {                                                                    \
+        if (flag == 0) {                                                                      \
+            char timestr[32];                                                                 \
+            get_timestamp(timestr, sizeof(timestr));                                          \
+            char log_str[LOGGING_BUFFER_MAX_LEN];                                             \
+            snprintf(log_str, LOGGING_BUFFER_MAX_LEN, "%s %d %ld %s :" format "\n",           \
+                    timestr, getpid(), syscall(SYS_gettid), LOG_TAG==NULL ? "": LOG_TAG, ##x);\
+            log_buffer_insert(log_str, sizeof(log_str), level);                               \
+        }                                                                                     \
+    }                                                                                         \
+}
+
+#ifndef DEBUG_DMN_LOC_API
+
+/* LOGGING MACROS */
+/*loc_logger.DEBUG_LEVEL is initialized to 0xff in loc_cfg.cpp
+  if that value remains unchanged, it means gps.conf did not
+  provide a value and we default to the initial value to use
+  Android's logging levels*/
+
+
+/* Tag based logging control MACROS */
+/* The logic is like this:
+ * 1, LOCAL_LOG_LEVEL is defined as a static variable in log_util.h,
+ *    then all source files which includes log_util.h will have its own LOCAL_LOG_LEVEL variable;
+ * 2, For each source file,
+ *    2.1, First time when LOC_LOG* is invoked(its LOCAL_LOG_LEVEL == -1),
+ *         Set the tag based log level according to the <tag, level> map;
+ *         If this tag isn't found in map, set local debug level as global loc_logger.DEBUG_LEVEL;
+ *    2.2, If not the first time, use its LOCAL_LOG_LEVEL as the debug level of this tag.
+*/
+static int LOCAL_LOG_LEVEL = -1;
+#define IF_LOC_LOG(x) \
+    if (((LOCAL_LOG_LEVEL == -1 && (LOCAL_LOG_LEVEL = get_tag_log_level(LOG_TAG)) >= x) ||\
+            LOCAL_LOG_LEVEL >= x) && LOCAL_LOG_LEVEL <= 5)
+
+#define IF_LOC_LOGE IF_LOC_LOG(1)
+#define IF_LOC_LOGW IF_LOC_LOG(2)
+#define IF_LOC_LOGI IF_LOC_LOG(3)
+#define IF_LOC_LOGD IF_LOC_LOG(4)
+#define IF_LOC_LOGV IF_LOC_LOG(5)
+
+#define LOC_LOGE(...) IF_LOC_LOGE { ALOGE(__VA_ARGS__); INSERT_BUFFER(LOG_NDEBUG, 0, __VA_ARGS__);}
+#define LOC_LOGW(...) IF_LOC_LOGW { ALOGW(__VA_ARGS__); INSERT_BUFFER(LOG_NDEBUG, 1, __VA_ARGS__);}
+#define LOC_LOGI(...) IF_LOC_LOGI { ALOGI(__VA_ARGS__); INSERT_BUFFER(LOG_NDEBUG, 2, __VA_ARGS__);}
+#define LOC_LOGD(...) IF_LOC_LOGD { ALOGD(__VA_ARGS__); INSERT_BUFFER(LOG_NDEBUG, 3, __VA_ARGS__);}
+#define LOC_LOGV(...) IF_LOC_LOGV { ALOGV(__VA_ARGS__); INSERT_BUFFER(LOG_NDEBUG, 4, __VA_ARGS__);}
+
+#else /* DEBUG_DMN_LOC_API */
+
+#define LOC_LOGE(...) ALOGE(__VA_ARGS__)
+#define LOC_LOGW(...) ALOGW(__VA_ARGS__)
+#define LOC_LOGI(...) ALOGI(__VA_ARGS__)
+#define LOC_LOGD(...) ALOGD(__VA_ARGS__)
+#define LOC_LOGV(...) ALOGV(__VA_ARGS__)
+
+#endif /* DEBUG_DMN_LOC_API */
+
+/*=============================================================================
+ *
+ *                          LOGGING IMPROVEMENT MACROS
+ *
+ *============================================================================*/
+#define LOG_(LOC_LOG, ID, WHAT, SPEC, VAL)                                    \
+    do {                                                                      \
+        if (loc_logger.TIMESTAMP) {                                           \
+            char ts[32];                                                      \
+            LOC_LOG("[%s] %s %s line %d " #SPEC,                              \
+                     get_timestamp(ts, sizeof(ts)), ID, WHAT, __LINE__, VAL); \
+        } else {                                                              \
+            LOC_LOG("%s %s line %d " #SPEC,                                   \
+                     ID, WHAT, __LINE__, VAL);                                \
+        }                                                                     \
+    } while(0)
+
+#define LOC_LOG_HEAD(fmt) "%s:%d] " fmt
+#define LOC_LOGv(fmt,...) LOC_LOGV(LOC_LOG_HEAD(fmt), __FUNCTION__, __LINE__, ##__VA_ARGS__)
+#define LOC_LOGw(fmt,...) LOC_LOGW(LOC_LOG_HEAD(fmt), __FUNCTION__, __LINE__, ##__VA_ARGS__)
+#define LOC_LOGi(fmt,...) LOC_LOGI(LOC_LOG_HEAD(fmt), __FUNCTION__, __LINE__, ##__VA_ARGS__)
+#define LOC_LOGd(fmt,...) LOC_LOGD(LOC_LOG_HEAD(fmt), __FUNCTION__, __LINE__, ##__VA_ARGS__)
+#define LOC_LOGe(fmt,...) LOC_LOGE(LOC_LOG_HEAD(fmt), __FUNCTION__, __LINE__, ##__VA_ARGS__)
+
+#define LOG_I(ID, WHAT, SPEC, VAL) LOG_(LOC_LOGI, ID, WHAT, SPEC, VAL)
+#define LOG_V(ID, WHAT, SPEC, VAL) LOG_(LOC_LOGV, ID, WHAT, SPEC, VAL)
+#define LOG_E(ID, WHAT, SPEC, VAL) LOG_(LOC_LOGE, ID, WHAT, SPEC, VAL)
+#define LOG_D(ID, WHAT, SPEC, VAL) LOG_(LOC_LOGD, ID, WHAT, SPEC, VAL)
+
+#define ENTRY_LOG() LOG_V(ENTRY_TAG, __FUNCTION__, %s, "")
+#define EXIT_LOG(SPEC, VAL) LOG_V(EXIT_TAG, __FUNCTION__, SPEC, VAL)
+#define EXIT_LOG_WITH_ERROR(SPEC, VAL)                       \
+    if (VAL != 0) {                                          \
+        LOG_E(EXIT_ERROR_TAG, __FUNCTION__, SPEC, VAL);          \
+    } else {                                                 \
+        LOG_V(EXIT_TAG, __FUNCTION__, SPEC, VAL);                \
+    }
+
+
+// Used for logging callflow from Android Framework
+#define ENTRY_LOG_CALLFLOW() LOG_I(FROM_AFW, __FUNCTION__, %s, "")
+// Used for logging callflow to Modem
+#define EXIT_LOG_CALLFLOW(SPEC, VAL) LOG_I(TO_MODEM, __FUNCTION__, SPEC, VAL)
+// Used for logging callflow from Modem(TO_MODEM, __FUNCTION__, %s, "")
+#define MODEM_LOG_CALLFLOW(SPEC, VAL) LOG_I(FROM_MODEM, __FUNCTION__, SPEC, VAL)
+// Used for logging high frequency callflow from Modem(TO_MODEM, __FUNCTION__, %s, "")
+#define MODEM_LOG_CALLFLOW_DEBUG(SPEC, VAL) LOG_D(FROM_MODEM, __FUNCTION__, SPEC, VAL)
+// Used for logging callflow to Android Framework
+#define CALLBACK_LOG_CALLFLOW(CB, SPEC, VAL) LOG_I(TO_AFW, CB, SPEC, VAL)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __LOG_UTIL_H__
diff --git a/gps/utils/msg_q.c b/gps/utils/msg_q.c
new file mode 100644
index 0000000..3383960
--- /dev/null
+++ b/gps/utils/msg_q.c
@@ -0,0 +1,380 @@
+/* Copyright (c) 2011-2012, 2014, 2017 The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+// Uncomment to log verbose logs
+#define LOG_NDEBUG 1
+#define LOG_TAG "LocSvc_utils_q"
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <loc_pla.h>
+#include <log_util.h>
+#include "linked_list.h"
+#include "msg_q.h"
+
+typedef struct msg_q {
+   void* msg_list;                  /* Linked list to store information */
+   pthread_cond_t  list_cond;       /* Condition variable for waiting on msg queue */
+   pthread_mutex_t list_mutex;      /* Mutex for exclusive access to message queue */
+   int unblocked;                   /* Has this message queue been unblocked? */
+} msg_q;
+
+/*===========================================================================
+FUNCTION    convert_linked_list_err_type
+
+DESCRIPTION
+   Converts from one set of enum values to another.
+
+   linked_list_val: Value to convert to msg_q_enum_type
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Corresponding linked_list_enum_type in msg_q_enum_type
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static msq_q_err_type convert_linked_list_err_type(linked_list_err_type linked_list_val)
+{
+   switch( linked_list_val )
+   {
+   case eLINKED_LIST_SUCCESS:
+      return eMSG_Q_SUCCESS;
+   case eLINKED_LIST_INVALID_PARAMETER:
+      return eMSG_Q_INVALID_PARAMETER;
+   case eLINKED_LIST_INVALID_HANDLE:
+      return eMSG_Q_INVALID_HANDLE;
+   case eLINKED_LIST_UNAVAILABLE_RESOURCE:
+      return eMSG_Q_UNAVAILABLE_RESOURCE;
+   case eLINKED_LIST_INSUFFICIENT_BUFFER:
+      return eMSG_Q_INSUFFICIENT_BUFFER;
+
+   case eLINKED_LIST_FAILURE_GENERAL:
+   default:
+      return eMSG_Q_FAILURE_GENERAL;
+   }
+}
+
+/* ----------------------- END INTERNAL FUNCTIONS ---------------------------------------- */
+
+/*===========================================================================
+
+  FUNCTION:   msg_q_init
+
+  ===========================================================================*/
+msq_q_err_type msg_q_init(void** msg_q_data)
+{
+   if( msg_q_data == NULL )
+   {
+      LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
+      return eMSG_Q_INVALID_PARAMETER;
+   }
+
+   msg_q* tmp_msg_q;
+   tmp_msg_q = (msg_q*)calloc(1, sizeof(msg_q));
+   if( tmp_msg_q == NULL )
+   {
+      LOC_LOGE("%s: Unable to allocate space for message queue!\n", __FUNCTION__);
+      return eMSG_Q_FAILURE_GENERAL;
+   }
+
+   if( linked_list_init(&tmp_msg_q->msg_list) != 0 )
+   {
+      LOC_LOGE("%s: Unable to initialize storage list!\n", __FUNCTION__);
+      free(tmp_msg_q);
+      return eMSG_Q_FAILURE_GENERAL;
+   }
+
+   if( pthread_mutex_init(&tmp_msg_q->list_mutex, NULL) != 0 )
+   {
+      LOC_LOGE("%s: Unable to initialize list mutex!\n", __FUNCTION__);
+      linked_list_destroy(&tmp_msg_q->msg_list);
+      free(tmp_msg_q);
+      return eMSG_Q_FAILURE_GENERAL;
+   }
+
+   if( pthread_cond_init(&tmp_msg_q->list_cond, NULL) != 0 )
+   {
+      LOC_LOGE("%s: Unable to initialize msg q cond var!\n", __FUNCTION__);
+      linked_list_destroy(&tmp_msg_q->msg_list);
+      pthread_mutex_destroy(&tmp_msg_q->list_mutex);
+      free(tmp_msg_q);
+      return eMSG_Q_FAILURE_GENERAL;
+   }
+
+   tmp_msg_q->unblocked = 0;
+
+   *msg_q_data = tmp_msg_q;
+
+   return eMSG_Q_SUCCESS;
+}
+
+/*===========================================================================
+
+  FUNCTION:   msg_q_init2
+
+  ===========================================================================*/
+const void* msg_q_init2()
+{
+  void* q = NULL;
+  if (eMSG_Q_SUCCESS != msg_q_init(&q)) {
+    q = NULL;
+  }
+  return q;
+}
+
+/*===========================================================================
+
+  FUNCTION:   msg_q_destroy
+
+  ===========================================================================*/
+msq_q_err_type msg_q_destroy(void** msg_q_data)
+{
+   if( msg_q_data == NULL )
+   {
+      LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
+      return eMSG_Q_INVALID_HANDLE;
+   }
+
+   msg_q* p_msg_q = (msg_q*)*msg_q_data;
+
+   linked_list_destroy(&p_msg_q->msg_list);
+   pthread_mutex_destroy(&p_msg_q->list_mutex);
+   pthread_cond_destroy(&p_msg_q->list_cond);
+
+   p_msg_q->unblocked = 0;
+
+   free(*msg_q_data);
+   *msg_q_data = NULL;
+
+   return eMSG_Q_SUCCESS;
+}
+
+/*===========================================================================
+
+  FUNCTION:   msg_q_snd
+
+  ===========================================================================*/
+msq_q_err_type msg_q_snd(void* msg_q_data, void* msg_obj, void (*dealloc)(void*))
+{
+   msq_q_err_type rv;
+   if( msg_q_data == NULL )
+   {
+      LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
+      return eMSG_Q_INVALID_HANDLE;
+   }
+   if( msg_obj == NULL )
+   {
+      LOC_LOGE("%s: Invalid msg_obj parameter!\n", __FUNCTION__);
+      return eMSG_Q_INVALID_PARAMETER;
+   }
+
+   msg_q* p_msg_q = (msg_q*)msg_q_data;
+
+   pthread_mutex_lock(&p_msg_q->list_mutex);
+   LOC_LOGV("%s: Sending message with handle = %p\n", __FUNCTION__, msg_obj);
+
+   if( p_msg_q->unblocked )
+   {
+      LOC_LOGE("%s: Message queue has been unblocked.\n", __FUNCTION__);
+      pthread_mutex_unlock(&p_msg_q->list_mutex);
+      return eMSG_Q_UNAVAILABLE_RESOURCE;
+   }
+
+   rv = convert_linked_list_err_type(linked_list_add(p_msg_q->msg_list, msg_obj, dealloc));
+
+   /* Show data is in the message queue. */
+   pthread_cond_signal(&p_msg_q->list_cond);
+
+   pthread_mutex_unlock(&p_msg_q->list_mutex);
+
+   LOC_LOGV("%s: Finished Sending message with handle = %p\n", __FUNCTION__, msg_obj);
+
+   return rv;
+}
+
+/*===========================================================================
+
+  FUNCTION:   msg_q_rcv
+
+  ===========================================================================*/
+msq_q_err_type msg_q_rcv(void* msg_q_data, void** msg_obj)
+{
+   msq_q_err_type rv;
+   if( msg_q_data == NULL )
+   {
+      LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
+      return eMSG_Q_INVALID_HANDLE;
+   }
+
+   if( msg_obj == NULL )
+   {
+      LOC_LOGE("%s: Invalid msg_obj parameter!\n", __FUNCTION__);
+      return eMSG_Q_INVALID_PARAMETER;
+   }
+
+   msg_q* p_msg_q = (msg_q*)msg_q_data;
+
+   pthread_mutex_lock(&p_msg_q->list_mutex);
+
+   if( p_msg_q->unblocked )
+   {
+      LOC_LOGE("%s: Message queue has been unblocked.\n", __FUNCTION__);
+      pthread_mutex_unlock(&p_msg_q->list_mutex);
+      return eMSG_Q_UNAVAILABLE_RESOURCE;
+   }
+
+   /* Wait for data in the message queue */
+   while( linked_list_empty(p_msg_q->msg_list) && !p_msg_q->unblocked )
+   {
+      pthread_cond_wait(&p_msg_q->list_cond, &p_msg_q->list_mutex);
+   }
+
+   rv = convert_linked_list_err_type(linked_list_remove(p_msg_q->msg_list, msg_obj));
+
+   pthread_mutex_unlock(&p_msg_q->list_mutex);
+
+   LOC_LOGV("%s: Received message %p rv = %d\n", __FUNCTION__, *msg_obj, rv);
+
+   return rv;
+}
+
+/*===========================================================================
+
+  FUNCTION:   msg_q_rmv
+
+  ===========================================================================*/
+msq_q_err_type msg_q_rmv(void* msg_q_data, void** msg_obj)
+{
+   msq_q_err_type rv;
+   if (msg_q_data == NULL) {
+      LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
+      return eMSG_Q_INVALID_HANDLE;
+   }
+
+   if (msg_obj == NULL) {
+      LOC_LOGE("%s: Invalid msg_obj parameter!\n", __FUNCTION__);
+      return eMSG_Q_INVALID_PARAMETER;
+   }
+
+   msg_q* p_msg_q = (msg_q*)msg_q_data;
+
+   pthread_mutex_lock(&p_msg_q->list_mutex);
+
+   if (p_msg_q->unblocked) {
+      LOC_LOGE("%s: Message queue has been unblocked.\n", __FUNCTION__);
+      pthread_mutex_unlock(&p_msg_q->list_mutex);
+      return eMSG_Q_UNAVAILABLE_RESOURCE;
+   }
+
+   if (linked_list_empty(p_msg_q->msg_list)) {
+      LOC_LOGW("%s: list is empty !!\n", __FUNCTION__);
+      pthread_mutex_unlock(&p_msg_q->list_mutex);
+      return eLINKED_LIST_EMPTY;
+   }
+
+   rv = convert_linked_list_err_type(linked_list_remove(p_msg_q->msg_list, msg_obj));
+
+   pthread_mutex_unlock(&p_msg_q->list_mutex);
+
+   LOC_LOGV("%s: Removed message %p rv = %d\n", __FUNCTION__, *msg_obj, rv);
+
+   return rv;
+}
+
+
+
+/*===========================================================================
+
+  FUNCTION:   msg_q_flush
+
+  ===========================================================================*/
+msq_q_err_type msg_q_flush(void* msg_q_data)
+{
+   msq_q_err_type rv;
+   if ( msg_q_data == NULL )
+   {
+      LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
+      return eMSG_Q_INVALID_HANDLE;
+   }
+
+   msg_q* p_msg_q = (msg_q*)msg_q_data;
+
+   LOC_LOGD("%s: Flushing Message Queue\n", __FUNCTION__);
+
+   pthread_mutex_lock(&p_msg_q->list_mutex);
+
+   /* Remove all elements from the list */
+   rv = convert_linked_list_err_type(linked_list_flush(p_msg_q->msg_list));
+
+   pthread_mutex_unlock(&p_msg_q->list_mutex);
+
+   LOC_LOGD("%s: Message Queue flushed\n", __FUNCTION__);
+
+   return rv;
+}
+
+/*===========================================================================
+
+  FUNCTION:   msg_q_unblock
+
+  ===========================================================================*/
+msq_q_err_type msg_q_unblock(void* msg_q_data)
+{
+   if ( msg_q_data == NULL )
+   {
+      LOC_LOGE("%s: Invalid msg_q_data parameter!\n", __FUNCTION__);
+      return eMSG_Q_INVALID_HANDLE;
+   }
+
+   msg_q* p_msg_q = (msg_q*)msg_q_data;
+   pthread_mutex_lock(&p_msg_q->list_mutex);
+
+   if( p_msg_q->unblocked )
+   {
+      LOC_LOGE("%s: Message queue has been unblocked.\n", __FUNCTION__);
+      pthread_mutex_unlock(&p_msg_q->list_mutex);
+      return eMSG_Q_UNAVAILABLE_RESOURCE;
+   }
+
+   LOC_LOGD("%s: Unblocking Message Queue\n", __FUNCTION__);
+   /* Unblocking message queue */
+   p_msg_q->unblocked = 1;
+
+   /* Allow all the waiters to wake up */
+   pthread_cond_broadcast(&p_msg_q->list_cond);
+
+   pthread_mutex_unlock(&p_msg_q->list_mutex);
+
+   LOC_LOGD("%s: Message Queue unblocked\n", __FUNCTION__);
+
+   return eMSG_Q_SUCCESS;
+}
diff --git a/gps/utils/msg_q.h b/gps/utils/msg_q.h
new file mode 100644
index 0000000..16df494
--- /dev/null
+++ b/gps/utils/msg_q.h
@@ -0,0 +1,230 @@
+/* Copyright (c) 2011, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __MSG_Q_H__
+#define __MSG_Q_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#include <stdlib.h>
+
+/** Linked List Return Codes */
+typedef enum
+{
+  eMSG_Q_SUCCESS                             = 0,
+     /**< Request was successful. */
+  eMSG_Q_FAILURE_GENERAL                     = -1,
+     /**< Failed because of a general failure. */
+  eMSG_Q_INVALID_PARAMETER                   = -2,
+     /**< Failed because the request contained invalid parameters. */
+  eMSG_Q_INVALID_HANDLE                      = -3,
+     /**< Failed because an invalid handle was specified. */
+  eMSG_Q_UNAVAILABLE_RESOURCE                = -4,
+     /**< Failed because an there were not enough resources. */
+  eMSG_Q_INSUFFICIENT_BUFFER                 = -5,
+     /**< Failed because an the supplied buffer was too small. */
+}msq_q_err_type;
+
+/*===========================================================================
+FUNCTION    msg_q_init
+
+DESCRIPTION
+   Initializes internal structures for message queue.
+
+   msg_q_data: pointer to an opaque Q handle to be returned; NULL if fails
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+msq_q_err_type msg_q_init(void** msg_q_data);
+
+/*===========================================================================
+FUNCTION    msg_q_init2
+
+DESCRIPTION
+   Initializes internal structures for message queue.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   opaque handle to the Q created; NULL if create fails
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+const void* msg_q_init2();
+
+/*===========================================================================
+FUNCTION    msg_q_destroy
+
+DESCRIPTION
+   Releases internal structures for message queue.
+
+   msg_q_data: State of message queue to be released.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+msq_q_err_type msg_q_destroy(void** msg_q_data);
+
+/*===========================================================================
+FUNCTION    msg_q_snd
+
+DESCRIPTION
+   Sends data to the message queue. The passed in data pointer
+   is not modified or freed. Passed in msg_obj is expected to live throughout
+   the use of the msg_q (i.e. data is not allocated internally)
+
+   msg_q_data: Message Queue to add the element to.
+   msgp:       Pointer to data to add into message queue.
+   dealloc:    Function used to deallocate memory for this element. Pass NULL
+               if you do not want data deallocated during a flush operation
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+msq_q_err_type msg_q_snd(void* msg_q_data, void* msg_obj, void (*dealloc)(void*));
+
+/*===========================================================================
+FUNCTION    msg_q_rcv
+
+DESCRIPTION
+   Retrieves data from the message queue. msg_obj is the oldest message received
+   and pointer is simply removed from message queue.
+
+   msg_q_data: Message Queue to copy data from into msgp.
+   msg_obj:    Pointer to space to copy msg_q contents to.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+msq_q_err_type msg_q_rcv(void* msg_q_data, void** msg_obj);
+
+/*===========================================================================
+FUNCTION    msg_q_rmv
+
+DESCRIPTION
+   Remove data from the message queue. msg_obj is the oldest message received
+   and pointer is simply removed from message queue.
+
+   msg_q_data: Message Queue to copy data from into msgp.
+   msg_obj:    Pointer to space to copy msg_q contents to.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+msq_q_err_type msg_q_rmv(void* msg_q_data, void** msg_obj);
+
+
+/*===========================================================================
+FUNCTION    msg_q_flush
+
+DESCRIPTION
+   Function removes all elements from the message queue.
+
+   msg_q_data: Message Queue to remove elements from.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+msq_q_err_type msg_q_flush(void* msg_q_data);
+
+/*===========================================================================
+FUNCTION    msg_q_unblock
+
+DESCRIPTION
+   This function will stop use of the message queue. All waiters will wake up
+   and likely receive nothing from the queue resulting in a negative return
+   value. The message queue can no longer be used until it is destroyed
+   and initialized again after calling this function.
+
+   msg_q_data: Message queue to unblock.
+
+DEPENDENCIES
+   N/A
+
+RETURN VALUE
+   Look at error codes above.
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+msq_q_err_type msg_q_unblock(void* msg_q_data);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __MSG_Q_H__ */