Sorry about my previous…. was answering a different question (about conflate)
The solution to this topic as provided by Lucca was to:
zsock_t *backend = zsock_new_xpub ("@tcp://*:5558");
assert(backend);
// if want to see multiple subscribers to same topic
int verbose = 1;
zsock_set_xpub_verbose(backend, verbose);
-Rich
> On Mar 8, 2018, at 2:39 PM, Luca Boccassi <[email protected]> wrote:
>
> On 8 Mar 2018 21:14, "Rich Schramm" <[email protected]> wrote:
> I am trying to implement lvcache from example with the czmq vsn 4.1.0. api I
> want to send last value from cache to any new subscriber to a topic. My
> problem is that only the first subscriber to a topic is seems to trigger an
> event for the backend XPUB socket in the poller_wait loop … ie 1st client
> subcriber to topic “FOO” and first client subscribing to topic “BAR” both
> are recognized. A third client also starting a subscription to “FOO” doesnt
> appear to be detected at the poller_wait.
> Likewise, the poller also doesnt trigger again until all clients that have
> subscribed to ‘FOO” are killed.
> Is this expected behavior and/or how can I make sure that every client
> subscribing is recognized and receives the topic’s initial cached value?
>
> -Rich Schramm
>
>
> To get duplicated subscriptions you need to set the xpub_verbose socket
> option.
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