diff --git a/core/gps_extended_c.h b/core/gps_extended_c.h
index 27deb442..cc7d31ec 100644
--- a/core/gps_extended_c.h
+++ b/core/gps_extended_c.h
@@ -416,6 +416,7 @@ typedef enum loc_api_adapter_msg_to_check_supported {
     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_MAX
 } LocCheckingMessagesID;
diff --git a/loc_api/libloc_api_50001/LocEngAdapter.cpp b/loc_api/libloc_api_50001/LocEngAdapter.cpp
index 35447d48..592662df 100644
--- a/loc_api/libloc_api_50001/LocEngAdapter.cpp
+++ b/loc_api/libloc_api_50001/LocEngAdapter.cpp
@@ -101,7 +101,6 @@ void LocEngAdapter::setXtraUserAgent() {
             char release[PROPERTY_VALUE_MAX];
             char manufacture[PROPERTY_VALUE_MAX];
             char model[PROPERTY_VALUE_MAX];
-            char carrier[PROPERTY_VALUE_MAX];
             char board[PROPERTY_VALUE_MAX];
             char brand[PROPERTY_VALUE_MAX];
             char chipsetsn[CHIPSET_SERIAL_NUMBER_MAX_LEN];
@@ -111,13 +110,18 @@ void LocEngAdapter::setXtraUserAgent() {
             property_get("ro.build.version.release", release,     defVal);
             property_get("ro.product.manufacturer",  manufacture, defVal);
             property_get("ro.product.model", model,   defVal);
-            property_get("ro.carrier",       carrier, defVal);
             property_get("ro.product.board", board,   defVal);
             property_get("ro.product.brand", brand,   defVal);
             getChipsetSerialNo(chipsetsn, sizeof(chipsetsn), defVal);
 
-            snprintf(userAgent, sizeof(userAgent), "A/%s/%s/%s/%s/%s/QCX3/s%u/-/%s/-/%s/-/-/-",
-                     release, manufacture, model, board, carrier,
+            encodeInPlace(release, PROPERTY_VALUE_MAX);
+            encodeInPlace(manufacture, PROPERTY_VALUE_MAX);
+            encodeInPlace(model, PROPERTY_VALUE_MAX);
+            encodeInPlace(board, PROPERTY_VALUE_MAX);
+            encodeInPlace(brand, PROPERTY_VALUE_MAX);
+
+            snprintf(userAgent, sizeof(userAgent), "A/%s/%s/%s/%s/-/QCX3/s%u/-/%s/-/%s/-/-/-",
+                     release, manufacture, model, board,
                      mContext->getIzatDevId(), chipsetsn, brand);
 
             for (int i = 0; i < sizeof(userAgent) && userAgent[i]; i++) {
@@ -199,6 +203,56 @@ void LocEngAdapter::setXtraUserAgent() {
             return;
         }
 
+        /**
+         *  encode the given string value such that all separator characters ('/','+','|','%')
+         *  in the string are repaced by their corresponding encodings (%2F","%2B","%7C", "%25")
+         */
+        static void encodeInPlace(char value[], const int size) {
+            char buffer[size];
+
+            struct ENCODE {
+                const char ch;
+                const char *code;
+            };
+
+            const ENCODE encodings[] = { {'/', "%2F"}, {'+', "%2B"}, {'|', "%7C",}, {'%', "%25"} };
+            const int nencodings = (int)sizeof(encodings) / sizeof(encodings[0]);
+
+            int inpos = 0, outpos = 0;
+            while(value[inpos] != '\0' && outpos < size - 1) {
+                // check if escaped character
+                int escchar = 0;
+                while(escchar < nencodings && encodings[escchar].ch != value[inpos]) {
+                    escchar++;
+                }
+
+                if (escchar == nencodings) {
+                    // non escaped character
+                    buffer[outpos++] = value[inpos++];
+                    continue;
+                }
+
+                // escaped character
+                int codepos = 0;
+                #define NUM_CHARS_IN_CODE 3
+
+                if (outpos + NUM_CHARS_IN_CODE >= size) {
+                    // skip last character if there is insufficient space
+                    break;
+                }
+
+                while(outpos < size - 1 && codepos < NUM_CHARS_IN_CODE) {
+                    buffer[outpos++] = encodings[escchar].code[codepos++];
+                }
+                inpos++;
+            }
+
+            // copy to ouput
+            value[outpos] = '\0';
+            while(--outpos >= 0) {
+                value[outpos] = buffer[outpos];
+            }
+        }
     };
 
     sendMsg(new LocSetXtraUserAgent(mContext));
diff --git a/loc_api/libloc_api_50001/loc_eng_nmea.cpp b/loc_api/libloc_api_50001/loc_eng_nmea.cpp
index 126a97f0..2868c0e8 100644
--- a/loc_api/libloc_api_50001/loc_eng_nmea.cpp
+++ b/loc_api/libloc_api_50001/loc_eng_nmea.cpp
@@ -136,6 +136,7 @@ void loc_eng_nmea_generate_pos(loc_eng_data_s_type *loc_eng_data_p,
     int utcHours = pTm->tm_hour;
     int utcMinutes = pTm->tm_min;
     int utcSeconds = pTm->tm_sec;
+    int utcMSeconds = (location.gpsLocation.timestamp)%1000;
 
     if (generate_nmea) {
         // ------------------
@@ -281,8 +282,8 @@ void loc_eng_nmea_generate_pos(loc_eng_data_s_type *loc_eng_data_p,
         pMarker = sentence;
         lengthRemaining = sizeof(sentence);
 
-        length = snprintf(pMarker, lengthRemaining, "$GPRMC,%02d%02d%02d,A," ,
-                          utcHours, utcMinutes, utcSeconds);
+        length = snprintf(pMarker, lengthRemaining, "$GPRMC,%02d%02d%02d.%02d,A," ,
+                          utcHours, utcMinutes, utcSeconds,utcMSeconds/10);
 
         if (length < 0 || length >= lengthRemaining)
         {
@@ -434,8 +435,8 @@ void loc_eng_nmea_generate_pos(loc_eng_data_s_type *loc_eng_data_p,
         pMarker = sentence;
         lengthRemaining = sizeof(sentence);
 
-        length = snprintf(pMarker, lengthRemaining, "$GPGGA,%02d%02d%02d," ,
-                          utcHours, utcMinutes, utcSeconds);
+        length = snprintf(pMarker, lengthRemaining, "$GPGGA,%02d%02d%02d.%02d," ,
+                          utcHours, utcMinutes, utcSeconds, utcMSeconds/10);
 
         if (length < 0 || length >= lengthRemaining)
         {