code: @Override
  	public void sendRequestWait(final KNXAddress dst, final Priority p, final byte[] nsdu)
  		throws KNXTimeoutException, KNXLinkClosedException
  	{
  		final int mc = mode == TUNNELING ? CEMILData.MC_LDATA_REQ : CEMILData.MC_LDATA_IND;
  		send(mc, dst, p, nsdu, true);
  	}
docs: {@inheritDoc} When communicating with a KNX network which uses open medium, messages are broadcasted within
  domain (as opposite to system broadcast) by default. Specify <code>dst null</code> for system broadcast.