[zeromq-dev] Sending via ROUTER socket to ROUTER socket fails initially with "No route to host"

[A. Mark]

Hi Anoop!

As I understand ZMQ_ROUTER sockets are like ZMQ_REP socket in that they
must receive a msg first. You cannot send a msg off the ZMQ_ROUTER socket
without it already had received a
msg first. In your example you send to the broker first. Also in your loop
there should be REQ-REP pattern eventually somewhere.

-Mark

On Mon, Mar 25, 2013 at 4:53 PM, Anoop Karollil <anoop.karollil at gmail.com>wrote:

> Hello,
>
> I am using ZeroMQ 3.2.2 and PyZMQ 13.0.0.
>
> When I try sending messages via a ROUTER socket to a ROUTER socket (both
> having their identities set), with ZMQ_ROUTER_MANDATORY set, the initial
> send of the destination sock identity (sent before actual message for
> routing) fails once, but succeeds after.
>
> Please see attached C or Python file which reproduces the behavior. It
> seems to happen only if the SNDMORE option is set - which if my
> understanding is correct is what should be done while sending the
> destination socket identity, before the actual message is sent with the
> SNDMORE flag unset.
>
> Is this intended behavior or am I doing something wrong?
>
> The C program gives the following output:
>
>
> Sending address...
> Error: No route to host
> Sending address...
> Success!
> Sending Hello...
> Success!
>
>
>
> Thanks,
> Anoop
>
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