Support Mediatek Chipset NMEAs

 On some of Mediatek chipsets, the SNR field is float instead of integer.

Author: nogakeren

minmea.c

@@ -535,8 +535,9 @@ bool minmea_parse_gsv(struct minmea_sentence_gsv *frame, const char *sentence)
     // $GPGSV,4,2,11,08,51,203,30,09,45,215,28*75
     // $GPGSV,4,4,13,39,31,170,27*40
     // $GPGSV,4,4,13*7B
+    // $GPGSV,3,1,11,09,57,333,29.0,07,54,227,,04,49,043,24.5,03,43,129,,1*67
 
-    if (!minmea_scan(sentence, "tiii;iiiiiiiiiiiiiiii",
+    if (!minmea_scan(sentence, "tiii;iiifiiifiiifiiif",
             &frame->type,
             &frame->total_msgs,
             &frame->msg_nr,

tests.c

@@ -42,6 +42,7 @@ static const char *valid_sentences_checksum[] = {
     "$GPGSV,4,2,13,08,51,203,30,09,45,215,28,10,69,197,19,13,47,081,*76",
     "$GPGSV,4,3,13,16,20,040,17,26,08,271,30,28,01,168,18,33,24,219,27*74",
     "$GPGSV,4,4,13,39,31,170,27*40",
+    "$GPGSV,3,1,11,09,57,333,29.0,07,54,227,,04,49,043,24.5,03,43,129,,1*67",
     "$GPGLL,5106.94086,N,01701.51680,E,123204.00,A,A*63",
     "$GPRMC,123205.00,A,5106.94085,N,01701.51689,E,0.016,,280214,,,A*7B",
     "$GPVTG,,T,,M,0.016,N,0.030,K,A*27",