> > The way in which this maybe achieved using 0MQ is to use 0MQ > alongwith some > > mechanism outside of 0mq that notifies a subscriber to initiate a > connection > > to a publisher because new messages have been published. > > How does XMPP pubsub interact with firewalls?
XMPP pubsub merely pushes the message out to the server on which the user is connected, so it does not encounter firewalls. It is a server to server push. It is then the job of the server to which the user is connected to push it out to the actual user
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