[quote="arunava_nag, post:5, topic:1391"]
So how do we have call backs from our publisher or subscriber?
[/quote]
You can have one callback per subscription, I don't know why you'd have a callback for a publisher. We might have callbacks for events like when a subscription is matched on a publisher or something like that, but in typical use cases you'd never have a callback on a publisher...
[quote="arunava_nag, post:5, topic:1391"]
Has multiple call backs been enabled?
[/quote]
No, but as I said above, you can have your own list of callbacks which you call in your subscriptions single callback.
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