code: @SuppressWarnings("unused")
  	protected boolean handleServiceType(final KNXnetIPHeader h, final byte[] data, final int offset,
  		final InetAddress src, final int port) throws KNXFormatException, IOException
  	{
  		// at this subtype level, we don't care about any service type
  		return false;
  	}
docs: This stub always returns false.
  
  @param h received KNXnet/IP header
  @param data received datagram data
  @param offset datagram data start offset
  @param src sender IP address
  @param port sender UDP port
  @return <code>true</code> if service type was known and handled (successfully or not), <code>false</code>
  otherwise
  @throws KNXFormatException on service type parsing or data format errors
  @throws IOException on socket problems