Problem with server-generated events in gunicorn

[lealbaugh]

My Flask app can quite happily emit socket messages from within the @socketio.on() decorator, and when I run the app bare locally (with socketio.run(app)) I can also use socketio.emit('my response', {'data': 'Server generated event'}) as in the example code. However, when I use gunicorn as my server (gunicorn --worker-class socketio.sgunicorn.GeventSocketIOWorker mymodule:app), my @socketio.on()-decorated emit() works fine but my server-generated events fail silently. I have tried various namespaces for them, including no mentioned namespace, namespace="", and namespace="/test". I'm running the app with debug=False. What else can I try?

[miguelgrinberg]

This was a bug in the example app, which did not start the background thread that sends the server generated messages.