A websocket server that you can use for testing. It will print all received messages to stdout

test-websocket-server.py

import argparse
import asyncio


def start_server(host, port):
    async def handle_client(websocket):
        client_addr = f"{websocket.remote_address[0]}:{websocket.remote_address[1]}"
        print(f"[{client_addr}] Client connected")
        # This function will be called each time a new client connects
        try:
            while True:
                message = await websocket.recv()
                print(f">>> {client_addr}: {message}")
        except websockets.exceptions.ConnectionClosed:
            print(f"[{client_addr}] Client connection closed")

    print(f"Listening on {host}:{port}")
    server = websockets.serve(handle_client, host, port)

    # Start the WebSocket server
    asyncio.get_event_loop().run_until_complete(server)
    asyncio.get_event_loop().run_forever()


if __name__ == "__main__":
    try:
        import websockets
    except:
        print("Failed to import websockets. Try `pip install websockets`.")

    parser = argparse.ArgumentParser(
        prog="python test-websocket-server.py",
        description="This is a websocket server that you can use for testing. It will print all received messages to stdout",
    )
    parser.add_argument("-H", "--host", default="0.0.0.0")
    parser.add_argument("-p", "--port", default=8765)

    args = parser.parse_args()

    start_server(args.host, args.port)