shutdown

Cleanly shut down the SyncClient and free up associated resources. Call this when exiting application or when done working with the SyncClient to properly finish working with Sync.

Avoid calling methods on Sync objects from their own callback events, as it may lead to unexpected nesting and poorly predictable behavior. SyncClient shutdown method must not be called from an event callback.

It will dispose() the client after shutdown, so it could not be reused.