Delay Problems when connecting to Flask-SocketIO

Question

Hello. I am currently developing an app where I require quite extensive exchange of data between a python application and the Unity game engine. I made a test implementation with Flask-SocketIO and this socket.io unity client. The setup of both was pretty easy and the connection worked well. However, now the problem. I wanted to see how quickly and effectively the data exchange works and wrote an application that emits a message every 0.1 seconds from the unity client. Then I noticed that a message is only emitted once every 2 seconds. I have tried around and even when I use a key-stroke event to emit the message to the server, it only works every 2 seconds. Moreover the unity application gets really slow then.

I am working on version 4.3.2 of Flask-SocketIO. This was neccessary to connect with the Unity client.

Server code:

rom flask import Flask, request, render_template
from flask import jsonify
from flask_socketio import SocketIO, send, emit
from flask_sockets import Sockets

positionData = [0];
app = Flask(__name__)
#sockets = Sockets(app)
from dashboard import init_dashboard
app = init_dashboard(app)
socketio = SocketIO( app, logger=True, engineio_logger=True , async_handlers = True)

@app.route('/testApi', methods = ['GET', 'POST'])
def booksFunction():
   if request.method == 'GET':
       return jsonify(username = "test", email = ["testmail", "aaa"], test =  "test")
   elif request.method == 'POST':
       print(request.json);
       positionData.append(request.json["x"]);
       return "nothing"

@app.route('/')
def hello_world():
    return render_template('landingpage.html')

@socketio.on('connect')
def test_connect():
    print("Client connnected")
    return "hello"
    #emit('chat', {'data': 'Connected'})

@socketio.on('message')
def handle_message(data):
    print('received message: ' + data)
    return "message"

@socketio.on('positionData')
def handle_message(data):
    print('received position: ' + data)
    return "hello"

if __name__ == '__main__':

    socketio.run(host='127.0.0.1')

Client code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Socket.Quobject.SocketIoClientDotNet.Client;
using System.Net.WebSockets;

public class SocketConnection : MonoBehaviour
{
    bool connected = false;
    private QSocket socket;

    void Start()
    {
        Debug.Log("start");
        socket = IO.Socket("http://localhost:5000/");

        socket.On(QSocket.EVENT_CONNECT, data => {
            Debug.Log("Connected");
            socket.Send("Client has connected");
            connected = true;
          // socket.Emit("positionaData", "Position");

        });

        socket.On("chat", data => {
            Debug.Log("data : " + data);
        });

        StartCoroutine(SendPositionData());
    }

    IEnumerator SendPositionData()
    {

        for(int i = 0; i < 100; i++)
        {
            yield return new WaitForSeconds(0.1f);

            socket.Emit("positionData", "1337");

            Debug.Log("data sent");

        }

        yield return null;

    }

    private void Update()
    {
       if (Input.GetKeyDown(KeyCode.Space))
        {
            socket.Emit("positionData", "1337");

            Debug.Log("data sent");

        }
    }

    private void OnDestroy()
    {
        socket.Disconnect();
    }
}

Rocher0724 / socket.io-unity

Delay Problems when connecting to Flask-SocketIO #13