Telemetry phone api guard (#1805)

* Delay start of telemetry modules

* Don't send unless our toPhoneQueue is empty

* Get wrecked, checks!

src/mesh/MeshService.cpp

@@ -283,3 +283,8 @@ int MeshService::onGPSChanged(const meshtastic::GPSStatus *newStatus)
 
     return 0;
 }
+
+bool MeshService::isToPhoneQueueEmpty() 
+{
+    return toPhoneQueue.isEmpty();
+}

src/mesh/MeshService.h

@@ -89,6 +89,8 @@ class MeshService
       /// Send a packet to the phone
     void sendToPhone(MeshPacket *p);
 
+    bool isToPhoneQueueEmpty();
+
   private:
     /// Called when our gps position has changed - updates nodedb and sends Location message out into the mesh
     /// returns 0 to allow futher processing