How to stop connections to zombie clients?

[AlexisTM]

I am using cherrypy. I and would like to stop the server-side connection of unreachable clients.

I did not get how to set the frequency heartbeat_freq for all the clients thus tried to set up one Heartbeat for each client on connection without success.

    def opened(self):
        self.hb = websocket.Heartbeat(self, 2.0)

To reproduce zombies:

• Start a phone connected to the WebSocket server
• Disable WiFi from the phone
• The client is disconnected but the backend never fails and self.client_terminated is never set to True

The only way to terminate the zombie is to restart WiFi, reopen a Websocket connection thus the other connection can finally fail (reachable again).