Create fake UDP traffic

I have to write a UDP client. Unfortunately, the source system is not always availabl开发者_StackOverflow中文版e

Is there a simple tool out there that I can use to create a fake UDP server/traffic on my machine?

You could use netcat with the -u option to send data over UDP.

Why don't you create UDP socket and fill it with dummy data?

PS: What do you mean by source system? Do you mean sender? In that case, you can generate localhost UDP socket.