@Override
 public boolean onMenuItemSelected(int featureId, MenuItem item) {
   switch (item.getItemId()) {
     case R.id.menu_connect:
       MAVClient.sendConnectMessage();
       return true;
     default:
       return super.onMenuItemSelected(featureId, item);
   }
 }
 @Override
 protected void onStop() {
   super.onDestroy();
   MAVClient.onDestroy();
 }
 @Override
 protected void onResume() {
   super.onRestart();
   MAVClient.init();
 }