fix #327 always factory reset the GPS once

src/gps/UBloxGPS.h

@@ -1,8 +1,8 @@
 #pragma once
 
+#include "../concurrency/PeriodicTask.h"
 #include "GPS.h"
 #include "Observer.h"
-#include "../concurrency/PeriodicTask.h"
 #include "SparkFun_Ublox_Arduino_Library.h"
 
 /**
@@ -33,12 +33,22 @@ class UBloxGPS : public GPS, public concurrency::PeriodicTask
      * called after the CPU wakes from light-sleep state */
     virtual void startLock();
 
-  private:
+    /**
+     * Reset our GPS back to factory settings
+     *
+     * @return true for success
+     */
+    bool factoryReset();
 
+  private:
     /// Prepare the GPS for the cpu entering deep or light sleep, expect to be gone for at least 100s of msecs
     /// always returns 0 to indicate okay to sleep
     int prepareSleep(void *unused);
 
     /// Attempt to connect to our GPS, returns false if no gps is present
     bool tryConnect();
+
+    /// Switch to our desired operating mode and save the settings to flash
+    /// returns true for success
+    bool setUBXMode();
 };