[zeromq-dev] state of publishers and subscribers via ZMQ_PUB and ZMQ_SUB

[Justin Karneges]

With ZeroMQ, any socket type can bind or connect. Who binds and who connects is matter of which entities should have stable or dynamic existence, not who is acting as a "server" in some kind of traditional sense. So yeah, you can have a PUB socket connect to a SUB socket and vice versa. Similarly you can have a REP socket connect to a REQ socket. Realizing that these combinations are possible is one of those "ah-hah" moments of enjoying ZeroMQ. :)

As for knowing when subscribers are connecting/reconnecting, in general
you should not need to care about this.

On Fri, Oct 23, 2015, at 06:21 PM, Aravind Sethuraman wrote:
> hello doron, i am actually interested in making the publisher a client
> and subscriber a server. Correct me if i am wrong but is it not a
> departure from the usual understanding of publisher being a server and
> subscriber clients? is it even possible to do that (i am guessing
> since you mentioned it; it must be ) . also how do i know which
> subscribers are connected and are reconnecting etc?
>
> On Fri, Oct 23, 2015 at 5:55 PM, Justin Karneges
> <justin at affinix.com> wrote:
>> __
>> If you make the subscriber the client, reconnections should still
>> work. I tested this myself again just now to be sure.
>>
>> On Fri, Oct 23, 2015, at 02:07 PM, Doron Somech wrote:
>>> make the publisher the client (connect) and the subscriber the
>>> server (bind), this is important, it will not work the other way,
>>> send heartbeat from publisher every X seconds (don't forget to make
>>> sure subscriber subscribe to the heartbeat). If you do it that way
>>> reconnection will happen automatically. Alternatively you can just
>>> enable TCP keep alive.


>>> On Oct 23, 2015 11:53 PM, "Aravind Sethuraman" <arvinj1 at gmail.com>
>>> wrote:
>>>> I am building a full mesh of publishers and subscribers (no
>>>> brokers) and as i would like to implement re-connecting when there
>>>> is a reboot of a node. How can i get a list of current state of
>>>> subscribers to a publisher node?
>>>>
>>>> thanks aRavind
>>>>
>>>>
>>>>
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