def subscribe(self, obj, handler):
    """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."""
    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    _LOGGER.warning("DEPRECATED: Subscribing via Lutron.subscribe is obsolete.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)
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.