Is there a callback to detect if another player is joining or leaving a room?

There are events for notifying when a player joins and leaves a room.

The Strix Notification Listener component has two events, Strix Room Join Notification Arrived and Strix Room Leave Notification Arrived. Strix Room Join Notification Arrived notifies when someone has joined a room, and Strix Room Leave Notification Arrived notifies when someone leaves a room.