GPSProvider: retry a few times before giving up when we get an error from the driver

This also replaces tabs with spaces

src/GPS/GPSProvider.cc

@@ -64,19 +64,31 @@ void GPSProvider::run()
 
             /* reset report */
             memset(&_reportGpsPos, 0, sizeof(_reportGpsPos));
-	        int helperRet;
 
-	        while ((helperRet = gpsHelper->receive(TIMEOUT_5HZ)) > 0 && !_requestStop) {
+            //In rare cases it can happen that we get an error from the driver (eg. checksum failure) due to
+            //bus errors or buggy firmware. In this case we want to try multiple times before giving up.
+            int numTries = 0;
+
+            while (!_requestStop && numTries < 3) {
+                int helperRet = gpsHelper->receive(TIMEOUT_5HZ);
+
+                if (helperRet > 0) {
+                    numTries = 0;
 
                     if (helperRet & 1) {
                         publishGPSPosition();
+                        numTries = 0;
                     }
 
                     if (_pReportSatInfo && (helperRet & 2)) {
                         publishGPSSatellite();
+                        numTries = 0;
+                    }
+                } else {
+                    ++numTries;
                 }
             }
-	        if (_serial->error() != QSerialPort::NoError) {
+            if (_serial->error() != QSerialPort::NoError && _serial->error() != QSerialPort::TimeoutError) {
                 break;
             }
         }