code: def subscribe(self, obj, handler):
      
      if not isinstance(obj, LutronEntity):
        raise InvalidSubscription("Subscription target not a LutronEntity")
      _LOGGER.warning("DEPRECATED: Subscribing via Lutron.subscribe is obsolete. "
                      "Please use LutronEntity.subscribe")
      if obj not in self._legacy_subscribers:
        self._legacy_subscribers[obj] = handler
        obj.subscribe(self._dispatch_legacy_subscriber, None)
docs: Subscribes to status updates of the requested object.
  
      DEPRECATED
  
      The handler will be invoked when the controller sends a notification
      regarding changed state. The user can then further query the object for the
      state itself.