My case is this: 1. The user is connected to public Wi-Fi 2. a new session is created and the server knows from which remoteIp 3. after 15 minutes, as the User works with the open session, the Wi-Fi signal is lost and automatically connects to a mobile network on his phone 4. The session has not timed out and the session has not been terminated, but the user's IP address has already changed. I need to know when point 4 happens, is this possible?   I try via TUn