code: protected void close(final BluetoothGatt gatt) {
  		logi("Cleaning up...");
  		sendLogBroadcast(LOG_LEVEL_DEBUG, "gatt.close()");
  		gatt.close();
  		mConnectionState = STATE_CLOSED;
  	}
docs: Closes the GATT device and cleans up.
  
  @param gatt the GATT device to be closed.