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sdk:gps-udp-client-gnsstogps [2019/11/28 11:15] – fachetsdk:gps-udp-client-gnsstogps [2021/10/08 10:22] (current) – [SDK Script gps-udp-client-GNSStoGPS.are] dodenhoeft
Line 1: Line 1:
 ====== Background ====== ====== Background ======
-GPS was the first Global Navigation Satellite System (GNSS) and the termt GPS is often used as a synonym for GNSS.+GPS was the first Global Navigation Satellite System (GNSS) and the term GPS is often used as a synonym for GNSS. 
 + 
 +Older software often only checks for NMEA 0183 sentences starting with <nowiki>"$GP"</nowiki> (= GPS only) instead of looking for  all GNSS systems. 
 + 
 +Newer GNSS receivers often use multiple GNSS systems and therefore <nowiki>"$GN"</nowiki> is used (<nowiki>"$GNRMC..."</nowiki>) if it recives a combination of GPS, Galileo and GLONASS signals.
  
-Because of this older software only check for NMEA 0183 sentences starting with <nowiki>"$GP"</nowiki> (= GPS only) instead of looking for the different GNSS systems (e.g. <nowiki>"$GPRMC..."</nowiki>).  
-Unfortunately with newer GNSS receiver often multiple GNSS systems are used and therefore <nowiki>"$GN"</nowiki> is used (<nowiki>"$GNRMC..."</nowiki>). 
 It would be better to us instead of <nowiki>"$GPRMC"</nowiki> either <nowiki>"$G.RMC"</nowiki> ("." = anychar) for using GPS, Galileo and/or GLONASS (GNSS) or even <nowiki>"$..RMC"</nowiki> which means any source. It would be better to us instead of <nowiki>"$GPRMC"</nowiki> either <nowiki>"$G.RMC"</nowiki> ("." = anychar) for using GPS, Galileo and/or GLONASS (GNSS) or even <nowiki>"$..RMC"</nowiki> which means any source.
  
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  GL = GLONASS  GL = GLONASS
  GP = GPS  GP = GPS
- GN = GNSS(multiple sources e.g. GPS "GP", Galileo "GA" and Glonass "GL")  + GN = GNSS position fix from more than one constellation (eg. GPS + GLONASS)
 "YYY" = Record "YYY" = Record
  RMC = Recommended Minimum Sentence C (used in most cases)  RMC = Recommended Minimum Sentence C (used in most cases)
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  GLL = Geographic Position - Latitude/Longitude  GLL = Geographic Position - Latitude/Longitude
  ...  ...
 +
 +Source: https://de.wikipedia.org/wiki/NMEA_0183
 </code> </code>
  
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  nb_config_set("gpsd.0.status=0");  nb_config_set("gpsd.0.status=0");
- sleep(3);+                do { 
 +                                sleep(3); 
 +                } while ( nb_config_done() != 0) 
 +     
  nb_config_set("gpsd.0.status=1");  nb_config_set("gpsd.0.status=1");
- sleep(5); +                do { 
 +                 sleep(5); 
 +                } while ( nb_config_done() != 0)
  return 0;  return 0;
 } }
- 
 int gpsd_connect () int gpsd_connect ()
 { {
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  exit(-1);  exit(-1);
  }  }
- for (attempt = 0; attempt <= 5; attempt++) { + for (attempt = 0; attempt <= 15; attempt++) { 
- sleep(3);+ sleep(15);
  
  if (connect(gpsd, local_ip, local_port) < 0) {  if (connect(gpsd, local_ip, local_port) < 0) {
  nb_syslog("Could not connect to daemon");  nb_syslog("Could not connect to daemon");
- if (attempt == 3) {+ if (attempt == 12) {
  nb_syslog("Unable to connect, restarting daemon");  nb_syslog("Unable to connect, restarting daemon");
  gpsd_restart();  gpsd_restart();

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sdk/gps-udp-client-gnsstogps.1574939738.txt.gz · Last modified: 2019/11/28 11:15 by fachet