[zeromq-dev] XSUB/XPUB proper usage

[Pieter Hintjens]

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.

> 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