docs: public static String decode(byte[] tpdu, KNXAddress dst)
  	{
  		if (tpdu.length < 1)
  			throw new KNXIllegalArgumentException("TPDU length too short");
  		final String s = decodeTPCI(tpdu[0] & 0xff, dst);
  		if (tpdu.length > 1)
  			return s + ", " + decodeAPCI(getAPDUService(tpdu));
  		return s;
  	}