[zeromq-dev] Label and Identity in XREP-XREQ sockets

[Abhinav Goyal]

Hi,

I am working on a distributed system where multiple clients and servers
can be present in the network. I have implemented a registry/discovery
using which the servers register themselves and the clients are able to
find (and connect to) the servers. The clients are implemented as XREQ
sockets and servers are implemeted as XREP sockets. So far, everything
works well- have I said "Thanks for ZMQ, guys" yet? :)

Now, I have a new requirement for *also* being able to direct a request
to a specified server. I implemented an approach wherein the server sets
its socket identity to its name (a user specified string) and the client
uses ZMQ_SNDLABEL to specify the server to which the request must be
sent. However, this approach doesn't seem to be working (messages are
going to other servers). 

I am wondering if this approach should ordinarily work and isn't working
because I am doing something incorrectly (not setting the proper
flag(s), not sending the null message in the proper place, etc). 

Could it be that SNDLABEL only use ZMQ's internal labels? If that is the
case, is there a way for me to retrieve the internal label at the server
end so that I can publish this to the registry service and the clients
can route the messages appropriately?

I almost forgot to mention that I am using ZMQ 3.0.

Thanks,
Abhinav


PS: Apologies if this question has been asked previously and this is
just a repeat. I tried to look for a search box on the web interface for
the archives but couldn't find one. 
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