[Twisted-Python] UDP asynchronous communication

[Adrian Libotean]

Hello,

First of all I must let you know that I am new to Twisted.

I need to implement a server discovery mechanism for my application. The 
way I chose to implement it is this:

	1. The client, when started, sends a broadcast message requesting 
servers to make their presence known (UDP broadcast)
	2. The server responds to this request using the same port on the 
sender's IP to reply (UDP normal message)
	3. ...

Now the problem I faced is that from the examples I found on the web 
(http://twisted.sourceforge.net/TwistedDocs-1.1.0/howto/udp.html), for 
multicast UDP messages, are done using listenUDP on both sides (server 
and client) and this approach is not good for me because I need a 
non-blocking communication mechanism on the client-side.