The Silent Crash: Handling Zombie WebSockets in Python IoT Applications

Short summary

Zombie WebSocket connections occur when IoT hardware loses network connectivity without sending a proper TCP close frame, leaving server coroutines permanently suspended and consuming resources. Use asyncio.wait_for() with 30-second timeouts and WebSocket ping/pong frames to actively probe and close dead connections. This pattern prevents cascading server failures when thousands of devices fall off the network simultaneously.

• •Zombie connections form when IoT hardware drops network silently without TCP close frame
• •Implement asyncio.wait_for(timeout=30) + WebSocket ping/pong to detect dead connections
• •Prevents resource exhaustion and cascading failures in production IoT deployments

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