Unity Websocket Multiplayer

POC for a Unity game client and game server with websockets!

There are 2 implementations of the game server. One in Python and one in Golang. The APIs for both servers are identical.

Requirements

• Unity Editor: version 2020.3.21f1
• Docker
• Docker Compose
• ngrok (optional)

Running Locally

1. Build and spin-up one of the websocket servers.

python

docker build -t python-gameserver:latest ./PythonGameServer
docker-compose -f ./PythonGameServer/docker-compose.yaml up

golang

docker build -t golang-gameserver:latest ./GolangGameServer
docker-compose -f ./GolangGameServer/docker-compose.yaml up

2. Open the Unity editor and run the game.

The players is simply a circle you can move around with WASD. Other connected players are red and the main player is white.

Testing Multiple Client Connections

1. Build and spin-up one of the game servers locally.

2. Expose to the internet with ngrok.

ngrok tcp 5000

3. Copy the ngrok URL to the game client, but replace the prefix tcp with the prefix ws.

Now you can connect multiple players who can see each other's movement!

Notes

This is a very simple proof-of-concept and could be used as a starting point for making a multiplayer game with the Unity engine.

It demonstrates game-client to game-server connection establishment, message transmission, and connection termination with the websocket protocol.

The entire game-server's code resides in:
PythonGameServer/server.py (python server)
GolangGameServer/server.go (golang server)

The game-client's websocket management resides in:
UnityWebSocketClient/Assets/Scripts/SceneManagerScript.cs

The Golang game server's architecture is inspired by this chat example.

Enjoy!