code: public byte[] toByteArray()
  	{
  		final ByteArrayOutputStream os = new ByteArrayOutputStream();
  		os.write(headersize);
  		os.write(version);
  		os.write(service >> 8);
  		os.write(service);
  		os.write(totalsize >> 8);
  		os.write(totalsize);
  		return os.toByteArray();
  	}
docs: Returns the byte representation of the KNXnet/IP header structure.
  <p>
  
  @return byte array containing structure