code: public void sendRequestWait(KNXAddress dst, Priority p, byte[] nsdu)
  		throws KNXTimeoutException, KNXLinkClosedException
  	{
  		send(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.