multiple async callbacks

[the-duke]

Hallo, I would like to use primus.io in a project. But I need that a server can responed multiple chunks to a client call before the acknowledge callback is called and removes the event listener. This would be a kind of streaming api for rpc, like in dnode or grpc. I know, for this purpose, it is possible do define an event listener on the client side, which the server can call for progress information. But I don't like the coding overhead to associate these client and server functions to each other. An optional second callback function to send progress information for the initial call would be really nice!

Best regards

Thomas