iPXE UDP message send/rx

[knoway]

Hi,
I have recently been using the iPXE software. Could any one help me with the following:

to add a message send option to/from iPXE over the network to another machine whose IP address is available. I have found that UDP has been used in DHCP, DNS, PXEBS, SYSLOGS, TFTP .... but could anyone guide me on how their implementation can be modified to use UDP to send/receive a message (a charachter buffer for example with acknowledgement from client).
I am not much familiar with these concepts.
There seems to be pattern like a monojob, a transfer control job, transfer data job in the above source files but how to use them for a simple data buffer transfer I do not know.

Thanks
knowno