stop
Stops delivering changes for the given key to listener.
Removal is local, so unlike setValue, getValue and observe this works whether or not the room is joined and while it is reconnecting — an app removing its listeners after leaving still detaches them. Nothing is reported to RoomEventListener.onError.
Parameters
key
the key to stop observing; an unknown key is ignored
listener
the listener to detach; one that was never registered is ignored