Direct message from server to client not working about flask-socketio

[frnsys]

I'm just starting to use this library and I'm having the same issue. The client appears to connect without a problem, but if I try to do something like:

socketio = SocketIO(app)

// ...

socketio.emit('some event', broadcast=True)

None of the clients appear to receive the message.

[frnsys]

I've been doing some digging and it seems that the issue may be because socket.active_ns does not have the default namespace:
https://github.com/miguelgrinberg/Flask-SocketIO/blob/master/flask_socketio/__init__.py#L186

I'm looking through the gevent-socketio code to see where namespaces are added to that but direction would be appreciated.

[frnsys]

Quick update: I managed to get this working by sending a message on connect client side and then receiving it server side:

// Client side
$(function() {
    var socket = io.connect('http://localhost:5000');
    socket.on('connect', function() {
        socket.emit('connect');
    });
});

# Server side
@socketio.on('connect')
def on_connect():
    pass

Then using socketio.emit started working fine.

[miguelgrinberg]

@mdgart Sorry, I seem to have missed your question from back a few months ago.

Have you resolved this problem? I would check if you are using the correct namespace. If you are using a namespace, this is implicit in the responses from inside a socket handler, but then when the server initiates there is no client context, so you have to specify the namespace. Hope this helps.

[mdgart]

Thanks for your answer, I resolved the problem.

[Dipen-D]

@mdgart , @miguelgrinberg : Look like I'm stuck with the similar question. Can anyone help me with this?

[wiwat-tharateeraparb]

+1 same issue here.

[MattSidor]

@mdgart, it would be so great if you could share with everyone how you resolved the problem (if you can remember by now -- I know it's been a long time)

[sjoerdvan]

I've been having this same problem. And I've partially solved it by adding a namespace to the emit. I send this from a seperate thread started by a client message. (See https://github.com/miguelgrinberg/Flask-SocketIO/blob/master/example/app.py for implementation details)

socketio.emit('message', {'Hello': "Goodbye"}, namespace="/test")

But I really want to call the function from another program and then send the message. This doesn't work (exact same code)
Any idea's?

[miguelgrinberg]

@sjoerdvan did you set up a message queue so that your other script can pass on the emits to the server?

[sjoerdvan]

Thats the plan. Why do you ask?

[miguelgrinberg]

@sjoerdvan well, you said your external script could not send emits. Maybe I misunderstood, seems you haven't done anything yet. Please check the docs for information on how to set up external scripts and you should be fine.

[sjoerdvan]

@miguelgrinberg ah yes, I completely missed that part of the docs, I will look into it. Thanks!