Flask-SocketIO rooms hello world

client.py

import socketio

sio = socketio.Client()

sio.connect('http://localhost:5000')

sio.emit('join', {"username": "iTrooz", "room":"myroom"})

@sio.on('chat')
def on_message(data):
    print('Received message: ', data)

server.py

from flask import Flask

from flask_socketio import join_room, emit

from flask_socketio import SocketIO

app = Flask("testapp")
socketio = SocketIO(app)

@socketio.on('join')
def on_join(data):
    print("socket msg")
    username = data['username']
    room = data['room']
    join_room(room)
    emit('chat', username + ' has entered the room.', room=room)

socketio.run(app)