Send UDP may be used to test UDP ports, in order to test if your datagram/UDP application works well, you'll need to send packets to it and test if it receives and read the packets well, the best solution for you is to use sendudp, if you ever used telnet to test your stream ports/TCP ports then you'll be familiar with sendudp, sendudp is an OpenSource tool you can edit it, customize it or just use it! sendudp is very simple to use even simpler that telnet, to use it you have to be familiar...