watch
Register a callback that fires whenever the endpoint's `EndpointAddr` changes (relay home rotates, IP discovered, etc.). The returned `WatchHandle` cancels the watcher when dropped or when its stop() method is called.
Register a callback that fires whenever the endpoint's `EndpointAddr` changes (relay home rotates, IP discovered, etc.). The returned `WatchHandle` cancels the watcher when dropped or when its stop() method is called.