How to send a response from Ratchet to ZMQ context
I modified the push integration tutorial on [http://socketo.me/docs/push](http://socketo.me/docs/push) for something a little different. 
In my case, I'll need to take an action when no one is subscribed to a topic ZMQ pushes an update for.
So If the condition statement below is true, can I return that to ZMQ
`// If the lookup topic object isn't set there is no one to publish to
        if (!array_key_exists($entryData['category'], $this->subscribedTopics)) {
            return;
        }`

`// I need to know from here if the update got to a subscriber`
`$socket->send(json_encode($entryData));`

Please is that possible?

Thanks for your time
