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    <p>Just like the server example above, there is a client example to. This should help you get started:</p> <ul> <li><a href="http://www.opendocs.net/python/twisted/howto/udp.html" rel="noreferrer">http://www.opendocs.net/python/twisted/howto/udp.html</a></li> <li><a href="http://twistedmatrix.com/documents/current/core/examples/echoclient_udp.py" rel="noreferrer">http://twistedmatrix.com/documents/current/core/examples/echoclient_udp.py</a></li> </ul> <p>Ok, here is a simple heart beat sender and receiver using datagram protocol.</p> <pre><code>from twisted.internet.protocol import DatagramProtocol from twisted.internet import reactor from twisted.internet.task import LoopingCall import sys, time class HeartbeatSender(DatagramProtocol): def __init__(self, name, host, port): self.name = name self.loopObj = None self.host = host self.port = port def startProtocol(self): # Called when transport is connected # I am ready to send heart beats self.loopObj = LoopingCall(self.sendHeartBeat) self.loopObj.start(2, now=False) def stopProtocol(self): "Called after all transport is teared down" pass def datagramReceived(self, data, (host, port)): print "received %r from %s:%d" % (data, host, port) def sendHeartBeat(self): self.transport.write(self.name, (self.host, self.port)) class HeartbeatReciever(DatagramProtocol): def __init__(self): pass def startProtocol(self): "Called when transport is connected" pass def stopProtocol(self): "Called after all transport is teared down" def datagramReceived(self, data, (host, port)): now = time.localtime(time.time()) timeStr = str(time.strftime("%y/%m/%d %H:%M:%S",now)) print "received %r from %s:%d at %s" % (data, host, port, timeStr) heartBeatSenderObj = HeartbeatSender("sender", "127.0.0.1", 8005) reactor.listenMulticast(8005, HeartbeatReciever(), listenMultiple=True) reactor.listenMulticast(8005, heartBeatSenderObj, listenMultiple=True) reactor.run() </code></pre> <p>The broadcast example simply modifies the above approach:</p> <pre><code>from twisted.internet.protocol import DatagramProtocol from twisted.internet import reactor from twisted.internet.task import LoopingCall import sys, time class HeartbeatSender(DatagramProtocol): def __init__(self, name, host, port): self.name = name self.loopObj = None self.host = host self.port = port def startProtocol(self): # Called when transport is connected # I am ready to send heart beats self.transport.joinGroup('224.0.0.1') self.loopObj = LoopingCall(self.sendHeartBeat) self.loopObj.start(2, now=False) def stopProtocol(self): "Called after all transport is teared down" pass def datagramReceived(self, data, (host, port)): print "received %r from %s:%d" % (data, host, port) def sendHeartBeat(self): self.transport.write(self.name, (self.host, self.port)) class HeartbeatReciever(DatagramProtocol): def __init__(self, name): self.name = name def startProtocol(self): "Called when transport is connected" self.transport.joinGroup('224.0.0.1') pass def stopProtocol(self): "Called after all transport is teared down" def datagramReceived(self, data, (host, port)): now = time.localtime(time.time()) timeStr = str(time.strftime("%y/%m/%d %H:%M:%S",now)) print "%s received %r from %s:%d at %s" % (self.name, data, host, port, timeStr) heartBeatSenderObj = HeartbeatSender("sender", "224.0.0.1", 8005) reactor.listenMulticast(8005, HeartbeatReciever("listner1"), listenMultiple=True) reactor.listenMulticast(8005, HeartbeatReciever("listner2"), listenMultiple=True) reactor.listenMulticast(8005, heartBeatSenderObj, listenMultiple=True) reactor.run() </code></pre>
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    1. COI found these examples myself with Google's help, but they don't address the problems I am having.
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    2. CO@Jake Does this address the problem of socket re-use or you are looking for something else?
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    3. CO+1 This works, but since it's using multicast only one of the listening reactors is receiving the data the sender is putting out. That brings me a bit closer to what I am looking for, which is a broadcast to all listening clients. (You should leave this example as is for people looking for multicast!)
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