nmea: fix status and mode indicator fields of RMC

Fix status and mode indicator fields to proper
values as per NMEA standard for GPRMC string.

Change-Id: I7fe0e292079c0f71bb37f6a1462f669e14f54b81
CRs-Fixed: 2537924

1 files changed, 13 insertions, 4 deletions

diff --git a/utils/loc_nmea.cpp b/utils/loc_nmea.cpp
index 24197ff..61db2be 100644
--- a/utils/loc_nmea.cpp
+++ b/utils/loc_nmea.cpp
@@ -1439,8 +1439,19 @@ void loc_nmea_generate_pos(const UlpLocation &location,
         pMarker = sentence_RMC;
         lengthRemaining = sizeof(sentence_RMC);
 
-        length = snprintf(pMarker, lengthRemaining, "$%sRMC,%02d%02d%02d.%02d,A," ,
-                          talker, utcHours, utcMinutes, utcSeconds,utcMSeconds/10);
+        bool validFix = ((0 != sv_cache_info.gps_used_mask) ||
+                (0 != sv_cache_info.glo_used_mask) ||
+                (0 != sv_cache_info.gal_used_mask) ||
+                (0 != sv_cache_info.qzss_used_mask) ||
+                (0 != sv_cache_info.bds_used_mask));
+
+        if (validFix) {
+            length = snprintf(pMarker, lengthRemaining, "$%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)
         {
@@ -1581,8 +1592,6 @@ void loc_nmea_generate_pos(const UlpLocation &location,
 
         // hardcode Navigation Status field to 'V'
         length = snprintf(pMarker, lengthRemaining, ",%c", 'V');
-        pMarker += length;
-        lengthRemaining -= length;
 
         length = loc_nmea_put_checksum(sentence_RMC, sizeof(sentence_RMC));