[zeromq-dev] Can a broker explicitly deny certain subscriptions to certain clients?

Doron Somech somdoron at gmail.com
Mon Aug 31 21:52:25 CEST 2015

You can use xpub manual subscription, you can read more here:


If for NetMQ but applicable also for zeromq.

On Mon, Aug 31, 2015 at 6:41 PM, David Jelenc <david.jelenc at fri.uni-lj.si>

> Hi,
> I'm wondering if there is a way to explicitly deny a certain client from
> subscribing to a certain topic.
> I have a broker set up, where some clients publish and other subscribe.
>   client                              client
> PUB --- (XSUB | broker  logic | XPUB) --- SUB
> Since I'm using a XPUB socket on the broker, I can see all subscription
> and subscription cancellation messages. However, once these messages
> reach broker, the client is already subscribed.
> Is there any way on how I can prevent a client from subscribing to
> certain topics (while allowing the same client to subscribe to some
> other) and enforce this on the broker side (in the broker logic)?
> Any help would be greatly appreciated.
> Best,
> David
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