def turn_on_with_brightness(self, device_id, name, brightness):
        """Scale brightness from 0..255 to 1..32."""
        brightness_value = round((brightness * 31) / 255) + 1
        # F1 = Light on and F0 = light off. FdP[0..32] is brightness. 32 is
        # full. We want that when turning the light on.
        msg = "!%sFdP%d|Lights %d|%s" % (
            device_id, brightness_value, brightness_value, name)
        self._send_message(msg)
Scale brightness from 0..255 to 1..32.