Extracted GPS handling into helper function that allows error propagation

src/multi-tracker.cpp

@@ -167,6 +167,21 @@ void Radio_Main(MSG *msg_out, MSG *msg_in) {
 
 }
 
+//Returns the result type and updates the global values(coordinates).
+uint8_t GPS_GetCoordinates() {
+    Serial.println("GPS_GetCoordinates()");
+  if (!gpsSerial.available()) {
+    Serial.println("INFO: GPS not availble.");
+    return NoReply;
+  }
+    gps.encode(gpsSerial.read());        // Decode the GPS data
+    if (gps.location.isValid()) {        // Check if GPS location data is valid
+      msg_out.latitude = gps.location.lat();
+      msg_out.longitude = gps.location.lat();
+    }
+
+    return Ok;
+}
 
 void setup(void) {
   // Initialize Serial Communication for debugging