central.py

central.Dockerfile

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+FROM python:3.8-slim
+
+EXPOSE 80
+WORKDIR /app
+RUN pip install --no-cache-dir websockets asyncudp
+
+COPY central.py /app/
+STOPSIGNAL SIGINT
+ENTRYPOINT ["python", "-u", "central.py"]

central.py

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+import os
+import asyncio
+import websockets
+import asyncudp
+
+UDP_IP = os.getenv("UDP_IP", "127.0.0.1")
+UDP_PORT = int(os.getenv("UDP_PORT", 12345))
+
+async def websocket_handler(websocket):
+    udp_socket = await asyncudp.create_socket(remote_addr=(UDP_IP, UDP_PORT))
+    print("Received new connection from", websocket.remote_address)
+
+    async def forward_to_websocket(udp_socket, websocket):
+        while True:
+            data, addr = await udp_socket.recvfrom()
+            await websocket.send(data)
+
+    task1 = asyncio.create_task(forward_to_websocket(udp_socket, websocket))
+
+    try:
+        async for message in websocket:
+            udp_socket.sendto(message)
+    except websockets.exceptions.ConnectionClosed:
+        pass
+    finally:
+        print("Connection to", websocket.remote_address, "is closed")
+        task1.cancel()
+        udp_socket.close()
+
+async def main():
+    async with websockets.serve(websocket_handler, "0.0.0.0", 80):
+        print("WebSocket server started")
+        while True:
+            await asyncio.sleep(3600)
+
+asyncio.run(main())

docker-compose.yml

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+services:
+  ws2udp:
+    build:
+      context: .
+      dockerfile: central.Dockerfile
+    ports:
+      - 80:80
+    restart: always