wsserver.py

#!/usr/bin/env python3

import asyncio
import json
import random
import websockets

async def hello(websocket, path):
    async for message in websocket:
        print(f"< {message}")
        response = message  # unaltered, just echo
        await websocket.send(response)
        print(f"> echoed {response}")

async def main():
    await websockets.serve(hello, 'localhost', 8765)
    await asyncio.get_running_loop().create_future()   # wait forever

asyncio.run(main())