[zeromq-dev] XSUB/XPUB proper usage

[Kenneth Adam Miller]

On Mon, Dec 29, 2014 at 3:23 PM, Pieter Hintjens <ph at imatix.com> wrote:

> Either XSUB or SUB can connect to XPUB. With XSUB you have to send the
> subscribe / unsubscribe messages yourself. With SUB they're sent by
> the socket. In either case the XPUB will detect a dead (X)SUB peer and
> generate ubsub messages up to the API.
>

Thank you!

Now I'm having issues with socket operation on non-socket exceptions...
  _xpub = new zmq::socket_t(_context, ZMQ_XPUB);
  _xpub->bind("inproc://killpub");
  _xsub = new zmq::socket_t(_context, ZMQ_XSUB);
  _xsub->bind("inproc://killsub");
  zmq::proxy(_xsub, _xpub, NULL);  //throws here

>
> On Mon, Dec 29, 2014 at 5:08 PM, Kenneth Adam Miller
> <kennethadammiller at gmail.com> wrote:
> >
> > On Mon, Dec 29, 2014 at 11:03 AM, Pieter Hintjens <ph at imatix.com> wrote:
> >>
> >> On Mon, Dec 29, 2014 at 4:51 PM, Kenneth Adam Miller
> >> <kennethadammiller at gmail.com> wrote:
> >>
> >> > Now my questions: for xpub and xsub do you do the following:
> >> >   pub->setsockopt(ZMQ_SUBSCRIBE, "", 0);
> >>
> >> No, this works only on SUB sockets.
> >>
> > I meant sub->setsockopt... but now that makes me think- don't I use
> ZMQ_SUB
> > to connect to ZMQ_XPUB?
> >
> >>
> >> > at all? Or does the following handle it completely:
> >> >   char *s = "xsubscriptionprefix";
> >> >   s[0]='\x01';
> >> >   sub->send(s);
> >>
> >> Yes.
> >>
> >> > Also is there a need for unsubscription upon closure of sub?
> >> > char *s="\x00";
> >> > sub->send(s);
> >>
> >> Not needed at the SUB side at all; it's handled by the PUB socket. (I
> >> think, from memory.)
> >>
> >> -Pieter
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> >
> >
> >
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