[zeromq-dev] Publish / Subscribe vs Multicast

gonzalo diethelm gdiethelm at dcv.cl
Mon Feb 15 22:39:00 CET 2010

> > I thought I would bind() a socket whenever I want that socket to
> > messages, and I would connect() a socket whenever I want to send
> > messages over it; kind of bind -> passive, connect -> active. Am I
> > totally off the chart here?
> As I understand it, the bind/connect choice has nothing to do with the
> direction of messages, but
> rather which endpoint has a TCP socket that is listening on a port
> (the "server" in traditional language) for incoming connections
> and which makes a TCP connection (the "client").  That is,
> bind/connect refers to the TCP-level actions of bind/connect,
> not message direction.

Sorry, I got mixed up. But what Brian mentions is what I meant by bind
-> passive (listening and waiting), connect -> active (initiating).

Now, within the context of my porting the butterfly example to ZMQ 2.0,
I am doing it exactly this way: apps bind endpoints when they will
listen for connections from somewhere else, and connect endpoints when
they are initiating a connection. But I have not been able to have
several instances of a program bind on the same endpoint and have all of
them (round-robin) receive the messages sent to that endpoint; only the
first app to bind to that endpoint is receiving messages. Am I missing

Thanks and best regards.

Gonzalo Diethelm

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