Real-Time Phoenix: use PubSub with implementation of Phoenix.Socket.Transport rather than channels (page 37)

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Hi, I’ve got a question about the implementation of PubSub when using a Phoenix.Socket.Transport behaviour rather than channels.
Before reading the book, I wrote a websocket server in Elixir using the Phoenix.Socket.Transport behaviour.

Since I’d like to use the PubSub to broadcast over multiple servers (using pg2 and libcluster to deliver messages also to remote nodes that are not in the same LAN), do I have to switch to channels to do that?

I ask it since in the book is not mentioned if you can build something like that also without channels.

Thanks in advance.

Andrea