Based on what you are showing, it seems that the print of “Starting factory” is not flushing.
I’m not sure which version of wslink you are using, but we use to have a -f arg. Also you can put inside your code some print("Starting factory", flush=True) to see if show up before the timeout.
When looking at your docker, you should just pip install wslink as the rest (twisted, autobahn) should come automatically as dependency.
But in truth, wslink 1.0.0+ do not depend on twisted and autobahn anymore. So I’m not sure why you are bringing them in.