Yes, i use the chat sample from the greate TWL library .
I have implement the simple quake sequence model for the UDP flow control.
The system send the same UDP packet until it received a "ack"-Packet.
http://trac.bookofhook.com/bookofhook/trac.cgi/wiki/Quake3Networking

Hi,
i have coded an UDP-network game. I use the a mix of Valve and Quake conepts.
But i cant test it ....no players... You can get the source and bin from google:

http://code.google.com/p/slick-netty-network-game-example/

You find slick (2d-lib), artemis (entity-engine) and netty in my project.
i hope i use this all in the right direction .

Thank you,
Heldenhaft