[ns] how to simulate UDP server?

[S.Thanga Prakash]

hi all,
        
     I am trying to simulate UDP server/client application.
The client will send the request and the server receives it and send it 
back to the client and client receives it.

When i tried with Agent/UDP? I don't know send the message back to client.

One more, the client behaves a source and sink.

Please, help me for the same.

regards,
stp.