:param timer: an int between fan_timer_range
        :return: nothing

def set_fan_timer(self, timer):
        """
        :param timer: an int between fan_timer_range
        :return: nothing
        """
        desired_state = {"timer": timer}

        resp = self.api_interface.set_device_state(self, {
            "desired_state": desired_state
        })

        self._update_state_from_response(resp)