ask for factory reset if GPS does not talk to us.

src/gps/GPS.cpp

@@ -96,12 +96,16 @@ bool GPS::setupGPS()
         delay(250);
 #endif
 #ifdef GPS_UBLOX
+        delay(250);
         // Set the UART port to output NMEA only
         byte _message_nmea[] = {0xB5, 0x62, 0x06, 0x00, 0x14, 0x00,
             0x01, 0x00, 0x00, 0x00, 0xC0, 0x08, 0x00, 0x00, 0x80, 0x25, 0x00, 0x00, 0x07, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
             0x91, 0xAF};
         _serial_gps->write(_message_nmea,sizeof(_message_nmea));
-        
+        if (!getACK(0x06, 0x00)) {
+            DEBUG_MSG("WARNING: Unable to enable NMEA Mode.\n");
+            return true;
+        }        
         // disable GGL
         byte _message_GGL[] = {0xB5, 0x62, 0x06, 0x01, 0x08, 0x00,
             0xF0, 0x01, 0x01, 0x00, 0x01, 0x01, 0x01, 0x01,
@@ -335,6 +339,15 @@ int32_t GPS::runOnce()
     if (whileIdle()) {
         // if we have received valid NMEA claim we are connected
         setConnected();
+    } else {
+#ifdef GPS_UBLOX        
+        // reset the GPS on next bootup
+        if(devicestate.did_gps_reset && (millis() > 60000)) {
+            DEBUG_MSG("GPS is not communicating, trying factory reset on next bootup.\n");
+            devicestate.did_gps_reset = false;
+            nodeDB.saveToDisk();
+        }
+#endif
     }
 
     // If we are overdue for an update, turn on the GPS and at least publish the current status

src/gps/NMEAGPS.cpp

@@ -17,6 +17,19 @@ static int32_t toDegInt(RawDegrees d)
     return r;
 }
 
+bool NMEAGPS::factoryReset()
+{
+#ifdef GPS_UBLOX
+        // Factory Reset
+        byte _message_reset[] = {0xB5, 0x62, 0x06, 0x09, 0x0D, 0x00, 0xFF,
+            0xFB, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0xFF, 0xFF, 0x00, 0x00, 0x17, 0x2B, 0x7E};
+        _serial_gps->write(_message_reset,sizeof(_message_reset));
+        delay(1000);
+        return true;
+#endif
+}
+
 bool NMEAGPS::setupGPS()
 {
     GPS::setupGPS();

src/gps/NMEAGPS.h

@@ -25,6 +25,8 @@ class NMEAGPS : public GPS
   public:
     virtual bool setupGPS() override;
 
+    virtual bool factoryReset() override;
+
   protected:
     /** Subclasses should look for serial rx characters here and feed it to their GPS parser
      * 

src/main.cpp

@@ -567,6 +567,7 @@ void setup()
 
     // ONCE we will factory reset the GPS for bug #327
     if (gps && !devicestate.did_gps_reset) {
+        DEBUG_MSG("GPS FactoryReset requested\n");
         if (gps->factoryReset()) { // If we don't succeed try again next time
             devicestate.did_gps_reset = true;
             nodeDB.saveToDisk();