Python SocketIO server to server communication: socketIO-client to Flask-SocketIO

client.py

from socketIO_client import SocketIO, BaseNamespace


class ChatNamespace(BaseNamespace):

    def on_connect(self):
        print('connect')
        self.emit('message', {'author': 'Client', 'message': {'author': 'Client', 'message': 'Hello, Server!'})

    def on_disconnect(self):
        print('disconnect')

    def on_reconnect(self):
        print('reconnect')

    def on_response(self, msg):
        print('{}: {}'.format(msg['author'], msg['message']))


socketIO = SocketIO('localhost', 6666)
chat_namespace = socketIO.define(ChatNamespace, '/chat')

chat_namespace.emit('message', {'author': 'Client', 'message': 'Server, are you there?'})
socketIO.wait(seconds=1)

server.py

from flask import Flask, request
from flask_socketio import SocketIO, emit

app = Flask(__name__)

socketio = SocketIO(app)
socketio_connections = set()


@socketio.on('message', namespace='/chat')
def chat_message(msg):
    print('{}: {}'.format(msg['author'], msg['message']))
    emit('response', {'author': 'Server', 'message': 'I heard you, Client :)'})


@socketio.on('connect', namespace='/chat')
def on_connect():
    socketio_connections.add(request.sid)

    print('Session created: {}'.format(request.sid))


@socketio.on('disconnect', namespace='/chat')
def on_disconnect():
    socketio_connections.remove(request.sid)
    print('Session disconnected: {}'.format(request.sid))


if __name__ == '__main__':
    socketio.run(app, host='0.0.0.0', port=6666)