Survive going to sleep and coming back

[pthatcher]

If there isn't a Wake Lock and a laptop goes to sleep, and comes back, it's likely that a long time has passed and that NAT bindings have probably been released and the remote endpoint (client or server) may have given up on us.

How quickly can a connection be restored?

• Can we use the same local ports?
• Can we use the same ICE ufrag/pwd?
• Do we automatically re-attempt STUN and TURN, or does the app need to do that?
• Do we automatically re-attempt ICE checks to the remote candidates, or does the app need to do that?
• Does a new crypto handshake need to be done? How do we know?

[steely-glint]

The reverse situation is also interesting - say a battery powered wildlife camera has turned off the radio but is still doing motion detection - it sees something and then wakes up and we want to reconnect to it as cheaply as possible. It can probably commit to preserving the IP/port ufrag/cert etc for the same peer.