Please can somebody explain the listener on the react extensions-boilerplate example

[BarryCarlyon]

@retro

But if I use pubsub the application cannot talk back right?

Your application can talk back. Depends what you are trying to talk back too.

You can use PubSub to talk to other PubSub connected users.

Extensions Reference

Provides a send function.

Or you can send from application/client/user to EBS via any javascript ajax function, such as fetch, jQuery.ajax or whatever.