code: byte[] toByteArray(ByteArrayOutputStream os)
  	{
  		byte[] buf = desc.getDevice().toByteArray();
  		os.write(buf, 0, buf.length);
  		buf = desc.getServiceFamilies().toByteArray();
  		os.write(buf, 0, buf.length);
  		return os.toByteArray();
  	}
docs: /* (non-Javadoc)
  @see tuwien.auto.calimero.knxnetip.servicetype.ServiceType#toByteArray
  (java.io.ByteArrayOutputStream)