[Twisted-Python] multicast

Pandelis Theodosiou ypercube at gmail.com
Thu Dec 16 03:09:46 MST 2010

On Thu, Dec 16, 2010 at 2:06 AM, Itamar Turner-Trauring <itamar at itamarst.org
> wrote:

> On Wed, 2010-12-15 at 18:07 +0200, Pandelis Theodosiou wrote:
> > I'm trying to make a Multicast client.
> >
> > I've tried the simple script found in:
> > http://twistedmatrix.com/documents/10.1.0/core/howto/udp.html#auto3
> >
> > While it shows no errors, it doesn't receive any data. How can I check
> > what the problem is?
> You didn't do the necessary joinGroup() call, which is in the original
> example.
I made many trials, and one was like this:

from twisted.internet.protocol import DatagramProtocol
from twisted.internet import reactor
from twisted.application.internet import MulticastServer

class MulticastClientUDP(DatagramProtocol):

    def startProtocol(self):

    def datagramReceived(self, datagram, address):
            print "Received:" + repr(datagram)

# Trying to receive from, on our dynamically allocated port
reactor.listenUDP(60044, MulticastClientUDP())

But datagramReceived is never called. Am I doing something wrong?
Is there any other method that should be called so I start listening on that

I've also tried to use listenMulticast instead of listenUDP but then I
realized this is if I need more than one application to listen/write to the
multicast port and I don't need that.
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