This project served as a way to connect Python with Unity 3D. However, in my current project (https://github.com/NumesSanguis/FACSvatar) I switched to ZeroMQ for this, which is more stable and more robust than the code found here. So I would recommend looking at that code.

A Python 3.6 client with asyncio for asynchronous execution, that can send to and receive JSON messages from a Unity3D server (Unity 2017.2.0f3).

1. Start Unity 3D from BasicUnityPython & press play (you should see in Unity: Server is listening)

2. Open terminal in this folder and run: python client_asyncio.py, you should see in Unity: "Hello World x" / Python terminal:

   Send: {'welcome': 'Hello World x!'} Received: {'unity': 'Unity sends its regards x'} Close the socket

1. Open terminal in this folder and run: python server_asyncio.py
2. Open another terminal here and run: python client_asyncio.py

1. Start Unity 3D from BasicUnityPython_aiohttp & press play
2. Open terminal in this folder and run: python client_asyncio_aiohttp.py (you should see in Unity: "data_stuff": x / Python terminal: message: {'receive': 'received x'})

• Get JSON object addon in your Unity project: https://assetstore.unity.com/packages/tools/input-management/json-object-710
• Add TCPTestServer.cs to your project from this Github if you want JSON support, or: https://gist.github.com/danielbierwirth/0636650b005834204cb19ef5ae6ccedb

Communication over SocketIO is inspired by tawnkramer/sdsandbox (https://github.com/tawnkramer/sdsandbox/tree/master). However SocketIO (both the original with FLASK and modified with aiohttp) was found to be way slower.

Measured with a phone stopwatch for 10 seconds:

• Just asyncio: 7738 messages received from Unity
• asyncio with SocketIO and aiohttp: 97 messages received from Unity (seems to be faster than no asyncio with FLASK)

Therefore simple asyncio about 80 times as fast with this unprofessional measurement.