Merge branch 'develop' into t-watch-ultra

src/gps/GPS.cpp

@@ -905,6 +905,12 @@ void GPS::writePinStandby(bool standby)
     // Write and log
     pinMode(PIN_GPS_STANDBY, OUTPUT);
     digitalWrite(PIN_GPS_STANDBY, val);
+
+    // Enter backup mode on PA1010D; TODO: may be applicable to other MTK GPS too
+    if (IS_ONE_OF(gnssModel, GNSS_MODEL_MTK_PA1010D)) {
+        _serial_gps->write("$PMTK225,4*2F\r\n");
+    }
+
 #ifdef GPS_DEBUG
     LOG_DEBUG("Pin STANDBY %s", val == HIGH ? "HI" : "LOW");
 #endif