[zeromq-dev] zmq_req / zmq_rep topology

[Martin Sustrik]

Jonathan,

> I intend to create a fairly complex networking topology using zmq_rep 
> and zmq_req sockets.  I have a couple questions:
> 
> 1.  When using IPC as the transport method, after binding a zmq_rep 
> socket to an IPC pathname, can I have multiple zmq_req sockets connect 
> to that same pathname and expect replies to be routed correctly by ZMQ?  
> (Are you using ports to identify to whom replies should be sent?)

Yes, you can. The mechanism underneath uses UNIX domain sockets rather 
than TCP i.e. no ports.

> 2.  I believe I need zmq_queue for my topology as well.  I noticed in 
> the manual that it has no documentation (all fields are "to be 
> written").  If it is incomplete, are there any updates on when it will 
> be released?  If it's finished, but simply doesn't have a manual page 
> yet, are there any examples of its usage out there that I could check out?

zmq_queue is and multi-hop REQ/REP is unfinished. You can make it work, 
but it requires some manual tweaking.

Jon Dyte was already able to get it working so he may consider 
commenting here.

Martin