Twisted Matrix and multicast broadcast

[Stodge]

I'm trying to get a simple multicast application working using
Twisted; so far I have:

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, which is the IP we will
respond to
self.transport.joinGroup('224.0.0.1')

def datagramReceived(self, datagram, address):
# The uniqueID check is to ensure we only service requests
from
# ourselves
if datagram == 'UniqueID':
print "Server Received: " + repr(datagram)
self.transport.write("data", address)

# Listen for multicast on 224.0.0.1:8005
reactor.listenMulticast(8005, MulticastServerUDP())
reactor.run()
and:

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

class MulticastClientUDP(DatagramProtocol):
def startProtocol(self):
print 'Started Listening'
# Join a specific multicast group, which is the IP we will
respond to
self.transport.joinGroup('224.0.0.1')

self.transport.write('UniqueID',('224.0.0.1', 8005))

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

# Send multicast on 224.0.0.1:8005, on our dynamically allocated port
reactor.listenMulticast(0, MulticastClientUDP())
reactor.run()

************************************************** **********************************

No surprises there! But how do I get the server to send to all clients
using multicast? transport.write requires an address. Any suggestions
appreciated.

Thanks