On 7/8/06, Alec Matusis <matusis@matusis.com> wrote:

...

You can have as many processes listening on a single MULTICAST UDP port as you like.

Well, I am trying to run this example multicast UDP server:

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

class MulticastServerUDP(DatagramProtocol): def startProtocol(self): print 'Started Listening' # Join a specific multicast group self.transport.joinGroup('225.0.0.1')

def datagramReceived(self, datagram, address): self.transport.write("data",address)

reactor.listenMulticast(8005, MulticastServerUDP()) reactor.run()

when I try running more that one instance of this on the same machine I get

twisted.internet.error.CannotListenError: Couldn't listen on any:8005: (98, 'Address already in use').

So my quiestion is how can I have multiple processes listening for multicast on the same machine?

________________________________

quick google for "udp twisted listen multiple" reveals

def startListening(self): reactor.listenMulticast(5353, self, maxPacketSize=1024, listenMultiple=True)