This paper illustrates how to control server with the UDP protocol. It covers UDP basics, how to spoof datagrams, and gives full source code with explanations. This paper can be used in conjunction with the udp-remote-final.tar.gz package.
You can download it from the following link: https://packetstormsecurity.com/files/download/30997/UDPRemoteControls.txt
Source: https://packetstormsecurity.com/files/30997/UDPRemoteControls.txt.html