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Here’s a couple of things to try to get the native-zmq parts working:

Use .connect()-method for SUB-sockets : socket.connect("tcp://localhost:6666")

And .bind()-method for your PUB-sockets : socket.bind("tcp://*:6666")

It’s explained here in the guide that connect should be used to create an outgoing connection from a socket.

In the sibling doc for .bind(), it explains that it’s for accepting connections.

Also try setting socket options : socket.setsockopt(zmq.SUBSCRIBE, "")

It is described here in the guide that the SUB-sockets initially filter out all messages, so that’d explain why you’re not receiving anything. The example above provides an empty filter, which accepts all incoming messages.

It’s important to note that with PUB and SUB based distribution, that the SUB might not necessarily receive messages due to timing of its connection or network conditions. E.g. everything sent from the publisher before the subscriber connects isn’t receivable

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