public static void nativeCb_AntStateChange(int NewState) {
    if (debug) Log.d(TAG, "nativeCb_AntStateChange: calling callback");

    if (mCallback != null) {
      mCallback.ANTStateChange(NewState);
    } else {
      Log.e(TAG, "nativeCb_AntStateChange: callback is null");
    }
  }