text: """
  Support for MQTT lights.
  
  For more details about this platform, please refer to the documentation at
  https://home-assistant.io/components/light.mqtt/
  """
  import logging
  
  import voluptuous as vol
  
  from homeassistant.core import callback
  from homeassistant.components import mqtt
  from homeassistant.components.light import (
      ATTR_BRIGHTNESS, ATTR_COLOR_TEMP, ATTR_EFFECT, ATTR_HS_COLOR,
      ATTR_WHITE_VALUE, Light, SUPPORT_BRIGHTNESS, SUPPORT_COLOR_TEMP,
      SUPPORT_EFFECT, SUPPORT_COLOR, SUPPORT_WHITE_VALUE)
  from homeassistant.const import (
      CONF_BRIGHTNESS, CONF_COLOR_TEMP, CONF_DEVICE, CONF_EFFECT, CONF_HS,
      CONF_NAME, CONF_OPTIMISTIC, CONF_PAYLOAD_OFF, CONF_PAYLOAD_ON, STATE_ON,
      CONF_RGB, CONF_STATE, CONF_VALUE_TEMPLATE, CONF_WHITE_VALUE, CONF_XY)
  from homeassistant.components.mqtt import (
      CONF_COMMAND_TOPIC, CONF_QOS, CONF_RETAIN, CONF_STATE_TOPIC,
      MqttAttributes, MqttAvailability, MqttDiscoveryUpdate,
      MqttEntityDeviceInfo, subscription)
  from homeassistant.helpers.restore_state import RestoreEntity
  import homeassistant.helpers.config_validation as cv
  import homeassistant.util.color as color_util
  
  _LOGGER = logging.getLogger(__name__)
  
  DEPENDENCIES = ['mqtt']
  
  CONF_BRIGHTNESS_COMMAND_TOPIC = 'brightness_command_topic'
  CONF_BRIGHTNESS_SCALE = 'brightness_scale'
  CONF_BRIGHTNESS_STATE_TOPIC = 'brightness_state_topic'
  CONF_BRIGHTNESS_VALUE_TEMPLATE = 'brightness_value_template'
  CONF_COLOR_TEMP_COMMAND_TEMPLATE = 'color_temp_command_template'
  CONF_COLOR_TEMP_COMMAND_TOPIC = 'color_temp_command_topic'
  CONF_COLOR_TEMP_STATE_TOPIC = 'color_temp_state_topic'
  CONF_COLOR_TEMP_VALUE_TEMPLATE = 'color_temp_value_template'
  CONF_EFFECT_COMMAND_TOPIC = 'effect_command_topic'
  CONF_EFFECT_LIST = 'effect_list'
  CONF_EFFECT_STATE_TOPIC = 'effect_state_topic'
  CONF_EFFECT_VALUE_TEMPLATE = 'effect_value_template'
  CONF_HS_COMMAND_TOPIC = 'hs_command_topic'
  CONF_HS_STATE_TOPIC = 'hs_state_topic'
  CONF_HS_VALUE_TEMPLATE = 'hs_value_template'
  CONF_RGB_COMMAND_TEMPLATE = 'rgb_command_template'
  CONF_RGB_COMMAND_TOPIC = 'rgb_command_topic'
  CONF_RGB_STATE_TOPIC = 'rgb_state_topic'
  CONF_RGB_VALUE_TEMPLATE = 'rgb_value_template'
  CONF_STATE_VALUE_TEMPLATE = 'state_value_template'
  CONF_XY_COMMAND_TOPIC = 'xy_command_topic'
  CONF_XY_STATE_TOPIC = 'xy_state_topic'
  CONF_XY_VALUE_TEMPLATE = 'xy_value_template'
  CONF_WHITE_VALUE_COMMAND_TOPIC = 'white_value_command_topic'
  CONF_WHITE_VALUE_SCALE = 'white_value_scale'
  CONF_WHITE_VALUE_STATE_TOPIC = 'white_value_state_topic'
  CONF_WHITE_VALUE_TEMPLATE = 'white_value_template'
  CONF_ON_COMMAND_TYPE = 'on_command_type'
  CONF_UNIQUE_ID = 'unique_id'
  
  DEFAULT_BRIGHTNESS_SCALE = 255
  DEFAULT_NAME = 'MQTT Light'
  DEFAULT_OPTIMISTIC = False
  DEFAULT_PAYLOAD_OFF = 'OFF'
  DEFAULT_PAYLOAD_ON = 'ON'
  DEFAULT_WHITE_VALUE_SCALE = 255
  DEFAULT_ON_COMMAND_TYPE = 'last'
  
  VALUES_ON_COMMAND_TYPE = ['first', 'last', 'brightness']
  
  PLATFORM_SCHEMA_BASIC = mqtt.MQTT_RW_PLATFORM_SCHEMA.extend({
      vol.Optional(CONF_BRIGHTNESS_COMMAND_TOPIC): mqtt.valid_publish_topic,
      vol.Optional(CONF_BRIGHTNESS_SCALE, default=DEFAULT_BRIGHTNESS_SCALE):
          vol.All(vol.Coerce(int), vol.Range(min=1)),
      vol.Optional(CONF_BRIGHTNESS_STATE_TOPIC): mqtt.valid_subscribe_topic,
      vol.Optional(CONF_BRIGHTNESS_VALUE_TEMPLATE): cv.template,
      vol.Optional(CONF_COLOR_TEMP_COMMAND_TEMPLATE): cv.template,
      vol.Optional(CONF_COLOR_TEMP_COMMAND_TOPIC): mqtt.valid_publish_topic,
      vol.Optional(CONF_COLOR_TEMP_STATE_TOPIC): mqtt.valid_subscribe_topic,
      vol.Optional(CONF_COLOR_TEMP_VALUE_TEMPLATE): cv.template,
      vol.Optional(CONF_EFFECT_COMMAND_TOPIC): mqtt.valid_publish_topic,
      vol.Optional(CONF_EFFECT_LIST): vol.All(cv.ensure_list, [cv.string]),
      vol.Optional(CONF_EFFECT_STATE_TOPIC): mqtt.valid_subscribe_topic,
      vol.Optional(CONF_EFFECT_VALUE_TEMPLATE): cv.template,
      vol.Optional(CONF_HS_COMMAND_TOPIC): mqtt.valid_publish_topic,
      vol.Optional(CONF_HS_STATE_TOPIC): mqtt.valid_subscribe_topic,
      vol.Optional(CONF_HS_VALUE_TEMPLATE): cv.template,
      vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
      vol.Optional(CONF_UNIQUE_ID): cv.string,
      vol.Optional(CONF_OPTIMISTIC, default=DEFAULT_OPTIMISTIC): cv.boolean,
      vol.Optional(CONF_PAYLOAD_OFF, default=DEFAULT_PAYLOAD_OFF): cv.string,
      vol.Optional(CONF_PAYLOAD_ON, default=DEFAULT_PAYLOAD_ON): cv.string,
      vol.Optional(CONF_RGB_COMMAND_TEMPLATE): cv.template,
      vol.Optional(CONF_RGB_COMMAND_TOPIC): mqtt.valid_publish_topic,
      vol.Optional(CONF_RGB_STATE_TOPIC): mqtt.valid_subscribe_topic,
      vol.Optional(CONF_RGB_VALUE_TEMPLATE): cv.template,
      vol.Optional(CONF_STATE_VALUE_TEMPLATE): cv.template,
      vol.Optional(CONF_WHITE_VALUE_COMMAND_TOPIC): mqtt.valid_publish_topic,
      vol.Optional(CONF_WHITE_VALUE_SCALE, default=DEFAULT_WHITE_VALUE_SCALE):
          vol.All(vol.Coerce(int), vol.Range(min=1)),
      vol.Optional(CONF_WHITE_VALUE_STATE_TOPIC): mqtt.valid_subscribe_topic,
      vol.Optional(CONF_WHITE_VALUE_TEMPLATE): cv.template,
      vol.Optional(CONF_XY_COMMAND_TOPIC): mqtt.valid_publish_topic,
      vol.Optional(CONF_XY_STATE_TOPIC): mqtt.valid_subscribe_topic,
      vol.Optional(CONF_XY_VALUE_TEMPLATE): cv.template,
      vol.Optional(CONF_ON_COMMAND_TYPE, default=DEFAULT_ON_COMMAND_TYPE):
          vol.In(VALUES_ON_COMMAND_TYPE),
      vol.Optional(CONF_DEVICE): mqtt.MQTT_ENTITY_DEVICE_INFO_SCHEMA,
  }).extend(mqtt.MQTT_AVAILABILITY_SCHEMA.schema).extend(
      mqtt.MQTT_JSON_ATTRS_SCHEMA.schema)
  
  
  async def async_setup_entity_basic(hass, config, async_add_entities,
                                     discovery_hash=None):
      """Set up a MQTT Light."""
      config.setdefault(
          CONF_STATE_VALUE_TEMPLATE, config.get(CONF_VALUE_TEMPLATE))
  
      async_add_entities([MqttLight(config, discovery_hash)])
  
  
  # pylint: disable=too-many-ancestors
  class MqttLight(MqttAttributes, MqttAvailability, MqttDiscoveryUpdate,
                  MqttEntityDeviceInfo, Light, RestoreEntity):
      """Representation of a MQTT light."""
  
      def __init__(self, config, discovery_hash):
          """Initialize MQTT light."""
          self._state = False
          self._sub_state = None
          self._brightness = None
          self._hs = None
          self._color_temp = None
          self._effect = None
          self._white_value = None
  
          self._topic = None
          self._payload = None
          self._templates = None
          self._optimistic = False
          self._optimistic_rgb = False
          self._optimistic_brightness = False
          self._optimistic_color_temp = False
          self._optimistic_effect = False
          self._optimistic_hs = False
          self._optimistic_white_value = False
          self._optimistic_xy = False
          self._unique_id = config.get(CONF_UNIQUE_ID)
  
          # Load config
          self._setup_from_config(config)
  
          device_config = config.get(CONF_DEVICE)
  
          MqttAttributes.__init__(self, config)
          MqttAvailability.__init__(self, config)
          MqttDiscoveryUpdate.__init__(self, discovery_hash,
                                       self.discovery_update)
          MqttEntityDeviceInfo.__init__(self, device_config)
  
      async def async_added_to_hass(self):
          """Subscribe to MQTT events."""
          await super().async_added_to_hass()
          await self._subscribe_topics()
  
      async def discovery_update(self, discovery_payload):
          """Handle updated discovery message."""
          config = PLATFORM_SCHEMA_BASIC(discovery_payload)
          self._setup_from_config(config)
          await self.attributes_discovery_update(config)
          await self.availability_discovery_update(config)
          await self._subscribe_topics()
          self.async_schedule_update_ha_state()
  
      def _setup_from_config(self, config):
          """(Re)Setup the entity."""
          self._config = config
  
          topic = {
              key: config.get(key) for key in (
                  CONF_BRIGHTNESS_COMMAND_TOPIC,
                  CONF_BRIGHTNESS_STATE_TOPIC,
                  CONF_COLOR_TEMP_COMMAND_TOPIC,
                  CONF_COLOR_TEMP_STATE_TOPIC,
                  CONF_COMMAND_TOPIC,
                  CONF_EFFECT_COMMAND_TOPIC,
                  CONF_EFFECT_STATE_TOPIC,
                  CONF_HS_COMMAND_TOPIC,
                  CONF_HS_STATE_TOPIC,
                  CONF_RGB_COMMAND_TOPIC,
                  CONF_RGB_STATE_TOPIC,
                  CONF_STATE_TOPIC,
                  CONF_WHITE_VALUE_COMMAND_TOPIC,
                  CONF_WHITE_VALUE_STATE_TOPIC,
                  CONF_XY_COMMAND_TOPIC,
                  CONF_XY_STATE_TOPIC,
              )
          }
          self._topic = topic
          self._payload = {
              'on': config.get(CONF_PAYLOAD_ON),
              'off': config.get(CONF_PAYLOAD_OFF),
          }
          self._templates = {
              CONF_BRIGHTNESS: config.get(CONF_BRIGHTNESS_VALUE_TEMPLATE),
              CONF_COLOR_TEMP: config.get(CONF_COLOR_TEMP_VALUE_TEMPLATE),
              CONF_COLOR_TEMP_COMMAND_TEMPLATE:
                  config.get(CONF_COLOR_TEMP_COMMAND_TEMPLATE),
              CONF_EFFECT: config.get(CONF_EFFECT_VALUE_TEMPLATE),
              CONF_HS: config.get(CONF_HS_VALUE_TEMPLATE),
              CONF_RGB: config.get(CONF_RGB_VALUE_TEMPLATE),
              CONF_RGB_COMMAND_TEMPLATE: config.get(CONF_RGB_COMMAND_TEMPLATE),
              CONF_STATE: config.get(CONF_STATE_VALUE_TEMPLATE),
              CONF_WHITE_VALUE: config.get(CONF_WHITE_VALUE_TEMPLATE),
              CONF_XY: config.get(CONF_XY_VALUE_TEMPLATE),
          }
  
          optimistic = config.get(CONF_OPTIMISTIC)
          self._optimistic = optimistic or topic[CONF_STATE_TOPIC] is None
          self._optimistic_rgb = \
              optimistic or topic[CONF_RGB_STATE_TOPIC] is None
          self._optimistic_brightness = (
              optimistic or
              (topic[CONF_BRIGHTNESS_COMMAND_TOPIC] is not None and
               topic[CONF_BRIGHTNESS_STATE_TOPIC] is None) or
              (topic[CONF_BRIGHTNESS_COMMAND_TOPIC] is None and
               topic[CONF_RGB_STATE_TOPIC] is None))
          self._optimistic_color_temp = (
              optimistic or topic[CONF_COLOR_TEMP_STATE_TOPIC] is None)
          self._optimistic_effect = (
              optimistic or topic[CONF_EFFECT_STATE_TOPIC] is None)
          self._optimistic_hs = \
              optimistic or topic[CONF_HS_STATE_TOPIC] is None
          self._optimistic_white_value = (
              optimistic or topic[CONF_WHITE_VALUE_STATE_TOPIC] is None)
          self._optimistic_xy = \
              optimistic or topic[CONF_XY_STATE_TOPIC] is None
  
      async def _subscribe_topics(self):
          """(Re)Subscribe to topics."""
          topics = {}
          templates = {}
          for key, tpl in list(self._templates.items()):
              if tpl is None:
                  templates[key] = lambda value: value
              else:
                  tpl.hass = self.hass
                  templates[key] = tpl.async_render_with_possible_json_value
  
          last_state = await self.async_get_last_state()
  
          @callback
          def state_received(topic, payload, qos):
              """Handle new MQTT messages."""
              payload = templates[CONF_STATE](payload)
              if not payload:
                  _LOGGER.debug("Ignoring empty state message from '%s'", topic)
                  return
  
              if payload == self._payload['on']:
                  self._state = True
              elif payload == self._payload['off']:
                  self._state = False
              self.async_schedule_update_ha_state()
  
          if self._topic[CONF_STATE_TOPIC] is not None:
              topics[CONF_STATE_TOPIC] = {
                  'topic': self._topic[CONF_STATE_TOPIC],
                  'msg_callback': state_received,
                  'qos': self._config.get(CONF_QOS)}
          elif self._optimistic and last_state:
              self._state = last_state.state == STATE_ON
  
          @callback
          def brightness_received(topic, payload, qos):
              """Handle new MQTT messages for the brightness."""
              payload = templates[CONF_BRIGHTNESS](payload)
              if not payload:
                  _LOGGER.debug("Ignoring empty brightness message from '%s'",
                                topic)
                  return
  
              device_value = float(payload)
              percent_bright = \
                  device_value / self._config.get(CONF_BRIGHTNESS_SCALE)
              self._brightness = percent_bright * 255
              self.async_schedule_update_ha_state()
  
          if self._topic[CONF_BRIGHTNESS_STATE_TOPIC] is not None:
              topics[CONF_BRIGHTNESS_STATE_TOPIC] = {
                  'topic': self._topic[CONF_BRIGHTNESS_STATE_TOPIC],
                  'msg_callback': brightness_received,
                  'qos': self._config.get(CONF_QOS)}
              self._brightness = 255
          elif self._optimistic_brightness and last_state\
                  and last_state.attributes.get(ATTR_BRIGHTNESS):
              self._brightness = last_state.attributes.get(ATTR_BRIGHTNESS)
          elif self._topic[CONF_BRIGHTNESS_COMMAND_TOPIC] is not None:
              self._brightness = 255
          else:
              self._brightness = None
  
          @callback
          def rgb_received(topic, payload, qos):
              """Handle new MQTT messages for RGB."""
              payload = templates[CONF_RGB](payload)
              if not payload:
                  _LOGGER.debug("Ignoring empty rgb message from '%s'", topic)
                  return
  
              rgb = [int(val) for val in payload.split(',')]
              self._hs = color_util.color_RGB_to_hs(*rgb)
              if self._topic[CONF_BRIGHTNESS_STATE_TOPIC] is None:
                  percent_bright = \
                      float(color_util.color_RGB_to_hsv(*rgb)[2]) / 100.0
                  self._brightness = percent_bright * 255
              self.async_schedule_update_ha_state()
  
          if self._topic[CONF_RGB_STATE_TOPIC] is not None:
              topics[CONF_RGB_STATE_TOPIC] = {
                  'topic': self._topic[CONF_RGB_STATE_TOPIC],
                  'msg_callback': rgb_received,
                  'qos': self._config.get(CONF_QOS)}
              self._hs = (0, 0)
          if self._optimistic_rgb and last_state\
                  and last_state.attributes.get(ATTR_HS_COLOR):
              self._hs = last_state.attributes.get(ATTR_HS_COLOR)
          elif self._topic[CONF_RGB_COMMAND_TOPIC] is not None:
              self._hs = (0, 0)
  
          @callback
          def color_temp_received(topic, payload, qos):
              """Handle new MQTT messages for color temperature."""
              payload = templates[CONF_COLOR_TEMP](payload)
              if not payload:
                  _LOGGER.debug("Ignoring empty color temp message from '%s'",
                                topic)
                  return
  
              self._color_temp = int(payload)
              self.async_schedule_update_ha_state()
  
          if self._topic[CONF_COLOR_TEMP_STATE_TOPIC] is not None:
              topics[CONF_COLOR_TEMP_STATE_TOPIC] = {
                  'topic': self._topic[CONF_COLOR_TEMP_STATE_TOPIC],
                  'msg_callback': color_temp_received,
                  'qos': self._config.get(CONF_QOS)}
              self._color_temp = 150
          if self._optimistic_color_temp and last_state\
                  and last_state.attributes.get(ATTR_COLOR_TEMP):
              self._color_temp = last_state.attributes.get(ATTR_COLOR_TEMP)
          elif self._topic[CONF_COLOR_TEMP_COMMAND_TOPIC] is not None:
              self._color_temp = 150
          else:
              self._color_temp = None
  
          @callback
          def effect_received(topic, payload, qos):
              """Handle new MQTT messages for effect."""
              payload = templates[CONF_EFFECT](payload)
              if not payload:
                  _LOGGER.debug("Ignoring empty effect message from '%s'", topic)
                  return
  
              self._effect = payload
              self.async_schedule_update_ha_state()
  
          if self._topic[CONF_EFFECT_STATE_TOPIC] is not None:
              topics[CONF_EFFECT_STATE_TOPIC] = {
                  'topic': self._topic[CONF_EFFECT_STATE_TOPIC],
                  'msg_callback': effect_received,
                  'qos': self._config.get(CONF_QOS)}
              self._effect = 'none'
          if self._optimistic_effect and last_state\
                  and last_state.attributes.get(ATTR_EFFECT):
              self._effect = last_state.attributes.get(ATTR_EFFECT)
          elif self._topic[CONF_EFFECT_COMMAND_TOPIC] is not None:
              self._effect = 'none'
          else:
              self._effect = None
  
          @callback
          def hs_received(topic, payload, qos):
              """Handle new MQTT messages for hs color."""
              payload = templates[CONF_HS](payload)
              if not payload:
                  _LOGGER.debug("Ignoring empty hs message from '%s'", topic)
                  return
  
              try:
                  hs_color = [float(val) for val in payload.split(',', 2)]
                  self._hs = hs_color
                  self.async_schedule_update_ha_state()
              except ValueError:
                  _LOGGER.debug("Failed to parse hs state update: '%s'",
                                payload)
  
          if self._topic[CONF_HS_STATE_TOPIC] is not None:
              topics[CONF_HS_STATE_TOPIC] = {
                  'topic': self._topic[CONF_HS_STATE_TOPIC],
                  'msg_callback': hs_received,
                  'qos': self._config.get(CONF_QOS)}
              self._hs = (0, 0)
          if self._optimistic_hs and last_state\
                  and last_state.attributes.get(ATTR_HS_COLOR):
              self._hs = last_state.attributes.get(ATTR_HS_COLOR)
          elif self._topic[CONF_HS_COMMAND_TOPIC] is not None:
              self._hs = (0, 0)
  
          @callback
          def white_value_received(topic, payload, qos):
              """Handle new MQTT messages for white value."""
              payload = templates[CONF_WHITE_VALUE](payload)
              if not payload:
                  _LOGGER.debug("Ignoring empty white value message from '%s'",
                                topic)
                  return
  
              device_value = float(payload)
              percent_white = \
                  device_value / self._config.get(CONF_WHITE_VALUE_SCALE)
              self._white_value = percent_white * 255
              self.async_schedule_update_ha_state()
  
          if self._topic[CONF_WHITE_VALUE_STATE_TOPIC] is not None:
              topics[CONF_WHITE_VALUE_STATE_TOPIC] = {
                  'topic': self._topic[CONF_WHITE_VALUE_STATE_TOPIC],
                  'msg_callback': white_value_received,
                  'qos': self._config.get(CONF_QOS)}
              self._white_value = 255
          elif self._optimistic_white_value and last_state\
                  and last_state.attributes.get(ATTR_WHITE_VALUE):
              self._white_value = last_state.attributes.get(ATTR_WHITE_VALUE)
          elif self._topic[CONF_WHITE_VALUE_COMMAND_TOPIC] is not None:
              self._white_value = 255
          else:
              self._white_value = None
  
          @callback
          def xy_received(topic, payload, qos):
              """Handle new MQTT messages for xy color."""
              payload = templates[CONF_XY](payload)
              if not payload:
                  _LOGGER.debug("Ignoring empty xy-color message from '%s'",
                                topic)
                  return
  
              xy_color = [float(val) for val in payload.split(',')]
              self._hs = color_util.color_xy_to_hs(*xy_color)
              self.async_schedule_update_ha_state()
  
          if self._topic[CONF_XY_STATE_TOPIC] is not None:
              topics[CONF_XY_STATE_TOPIC] = {
                  'topic': self._topic[CONF_XY_STATE_TOPIC],
                  'msg_callback': xy_received,
                  'qos': self._config.get(CONF_QOS)}
              self._hs = (0, 0)
          if self._optimistic_xy and last_state\
                  and last_state.attributes.get(ATTR_HS_COLOR):
              self._hs = last_state.attributes.get(ATTR_HS_COLOR)
          elif self._topic[CONF_XY_COMMAND_TOPIC] is not None:
              self._hs = (0, 0)
  
          self._sub_state = await subscription.async_subscribe_topics(
              self.hass, self._sub_state,
              topics)
  
      async def async_will_remove_from_hass(self):
          """Unsubscribe when removed."""
          self._sub_state = await subscription.async_unsubscribe_topics(
              self.hass, self._sub_state)
          await MqttAttributes.async_will_remove_from_hass(self)
          await MqttAvailability.async_will_remove_from_hass(self)
  
      @property
      def brightness(self):
          """Return the brightness of this light between 0..255."""
          brightness = self._brightness
          if brightness:
              brightness = min(round(brightness), 255)
          return brightness
  
      @property
      def hs_color(self):
          """Return the hs color value."""
          return self._hs
  
      @property
      def color_temp(self):
          """Return the color temperature in mired."""
          return self._color_temp
  
      @property
      def white_value(self):
          """Return the white property."""
          white_value = self._white_value
          if white_value:
              white_value = min(round(white_value), 255)
          return white_value
  
      @property
      def should_poll(self):
          """No polling needed for a MQTT light."""
          return False
  
      @property
      def name(self):
          """Return the name of the device if any."""
          return self._config.get(CONF_NAME)
  
      @property
      def unique_id(self):
          """Return a unique ID."""
          return self._unique_id
  
      @property
      def is_on(self):
          """Return true if device is on."""
          return self._state
  
      @property
      def assumed_state(self):
          """Return true if we do optimistic updates."""
          return self._optimistic
  
      @property
      def effect_list(self):
          """Return the list of supported effects."""
          return self._config.get(CONF_EFFECT_LIST)
  
      @property
      def effect(self):
          """Return the current effect."""
          return self._effect
  
      @property
      def supported_features(self):
          """Flag supported features."""
          supported_features = 0
          supported_features |= (
              self._topic[CONF_RGB_COMMAND_TOPIC] is not None and
              (SUPPORT_COLOR | SUPPORT_BRIGHTNESS))
          supported_features |= (
              self._topic[CONF_BRIGHTNESS_COMMAND_TOPIC] is not None and
              SUPPORT_BRIGHTNESS)
          supported_features |= (
              self._topic[CONF_COLOR_TEMP_COMMAND_TOPIC] is not None and
              SUPPORT_COLOR_TEMP)
          supported_features |= (
              self._topic[CONF_EFFECT_COMMAND_TOPIC] is not None and
              SUPPORT_EFFECT)
          supported_features |= (
              self._topic[CONF_HS_COMMAND_TOPIC] is not None and SUPPORT_COLOR)
          supported_features |= (
              self._topic[CONF_WHITE_VALUE_COMMAND_TOPIC] is not None and
              SUPPORT_WHITE_VALUE)
          supported_features |= (
              self._topic[CONF_XY_COMMAND_TOPIC] is not None and SUPPORT_COLOR)
  
          return supported_features
  
      async def async_turn_on(self, **kwargs):
          """Turn the device on.
  
          This method is a coroutine.
          """
          should_update = False
          on_command_type = self._config.get(CONF_ON_COMMAND_TYPE)
  
          if on_command_type == 'first':
              mqtt.async_publish(
                  self.hass, self._topic[CONF_COMMAND_TOPIC],
                  self._payload['on'], self._config.get(CONF_QOS),
                  self._config.get(CONF_RETAIN))
              should_update = True
  
          # If brightness is being used instead of an on command, make sure
          # there is a brightness input.  Either set the brightness to our
          # saved value or the maximum value if this is the first call
          elif on_command_type == 'brightness':
              if ATTR_BRIGHTNESS not in kwargs:
                  kwargs[ATTR_BRIGHTNESS] = self._brightness if \
                                            self._brightness else 255
  
          if ATTR_HS_COLOR in kwargs and \
             self._topic[CONF_RGB_COMMAND_TOPIC] is not None:
  
              hs_color = kwargs[ATTR_HS_COLOR]
  
              # If there's a brightness topic set, we don't want to scale the RGB
              # values given using the brightness.
              if self._topic[CONF_BRIGHTNESS_COMMAND_TOPIC] is not None:
                  brightness = 255
              else:
                  brightness = kwargs.get(
                      ATTR_BRIGHTNESS, self._brightness if self._brightness else
                      255)
              rgb = color_util.color_hsv_to_RGB(
                  hs_color[0], hs_color[1], brightness / 255 * 100)
              tpl = self._templates[CONF_RGB_COMMAND_TEMPLATE]
              if tpl:
                  rgb_color_str = tpl.async_render({
                      'red': rgb[0],
                      'green': rgb[1],
                      'blue': rgb[2],
                  })
              else:
                  rgb_color_str = '{},{},{}'.format(*rgb)
  
              mqtt.async_publish(
                  self.hass, self._topic[CONF_RGB_COMMAND_TOPIC],
                  rgb_color_str, self._config.get(CONF_QOS),
                  self._config.get(CONF_RETAIN))
  
              if self._optimistic_rgb:
                  self._hs = kwargs[ATTR_HS_COLOR]
                  should_update = True
  
          if ATTR_HS_COLOR in kwargs and \
             self._topic[CONF_HS_COMMAND_TOPIC] is not None:
  
              hs_color = kwargs[ATTR_HS_COLOR]
              mqtt.async_publish(
                  self.hass, self._topic[CONF_HS_COMMAND_TOPIC],
                  '{},{}'.format(*hs_color), self._config.get(CONF_QOS),
                  self._config.get(CONF_RETAIN))
  
              if self._optimistic_hs:
                  self._hs = kwargs[ATTR_HS_COLOR]
                  should_update = True
  
          if ATTR_HS_COLOR in kwargs and \
             self._topic[CONF_XY_COMMAND_TOPIC] is not None:
  
              xy_color = color_util.color_hs_to_xy(*kwargs[ATTR_HS_COLOR])
              mqtt.async_publish(
                  self.hass, self._topic[CONF_XY_COMMAND_TOPIC],
                  '{},{}'.format(*xy_color), self._config.get(CONF_QOS),
                  self._config.get(CONF_RETAIN))
  
              if self._optimistic_xy:
                  self._hs = kwargs[ATTR_HS_COLOR]
                  should_update = True
  
          if ATTR_BRIGHTNESS in kwargs and \
             self._topic[CONF_BRIGHTNESS_COMMAND_TOPIC] is not None:
              percent_bright = float(kwargs[ATTR_BRIGHTNESS]) / 255
              brightness_scale = self._config.get(CONF_BRIGHTNESS_SCALE)
              device_brightness = \
                  min(round(percent_bright * brightness_scale), brightness_scale)
              mqtt.async_publish(
                  self.hass, self._topic[CONF_BRIGHTNESS_COMMAND_TOPIC],
                  device_brightness, self._config.get(CONF_QOS),
                  self._config.get(CONF_RETAIN))
  
              if self._optimistic_brightness:
                  self._brightness = kwargs[ATTR_BRIGHTNESS]
                  should_update = True
          elif ATTR_BRIGHTNESS in kwargs and ATTR_HS_COLOR not in kwargs and\
                  self._topic[CONF_RGB_COMMAND_TOPIC] is not None:
              rgb = color_util.color_hsv_to_RGB(
                  self._hs[0], self._hs[1], kwargs[ATTR_BRIGHTNESS] / 255 * 100)
              tpl = self._templates[CONF_RGB_COMMAND_TEMPLATE]
              if tpl:
                  rgb_color_str = tpl.async_render({
                      'red': rgb[0],
                      'green': rgb[1],
                      'blue': rgb[2],
                  })
              else:
                  rgb_color_str = '{},{},{}'.format(*rgb)
  
              mqtt.async_publish(
                  self.hass, self._topic[CONF_RGB_COMMAND_TOPIC],
                  rgb_color_str, self._config.get(CONF_QOS),
                  self._config.get(CONF_RETAIN))
  
              if self._optimistic_brightness:
                  self._brightness = kwargs[ATTR_BRIGHTNESS]
                  should_update = True
  
          if ATTR_COLOR_TEMP in kwargs and \
             self._topic[CONF_COLOR_TEMP_COMMAND_TOPIC] is not None:
              color_temp = int(kwargs[ATTR_COLOR_TEMP])
              tpl = self._templates[CONF_COLOR_TEMP_COMMAND_TEMPLATE]
  
              if tpl:
                  color_temp = tpl.async_render({
                      'value': color_temp,
                  })
  
              mqtt.async_publish(
                  self.hass, self._topic[CONF_COLOR_TEMP_COMMAND_TOPIC],
                  color_temp, self._config.get(CONF_QOS),
                  self._config.get(CONF_RETAIN))
  
              if self._optimistic_color_temp:
                  self._color_temp = kwargs[ATTR_COLOR_TEMP]
                  should_update = True
  
          if ATTR_EFFECT in kwargs and \
             self._topic[CONF_EFFECT_COMMAND_TOPIC] is not None:
              effect = kwargs[ATTR_EFFECT]
              if effect in self._config.get(CONF_EFFECT_LIST):
                  mqtt.async_publish(
                      self.hass, self._topic[CONF_EFFECT_COMMAND_TOPIC],
                      effect, self._config.get(CONF_QOS),
                      self._config.get(CONF_RETAIN))
  
                  if self._optimistic_effect:
                      self._effect = kwargs[ATTR_EFFECT]
                      should_update = True
  
          if ATTR_WHITE_VALUE in kwargs and \
             self._topic[CONF_WHITE_VALUE_COMMAND_TOPIC] is not None:
              percent_white = float(kwargs[ATTR_WHITE_VALUE]) / 255
              white_scale = self._config.get(CONF_WHITE_VALUE_SCALE)
              device_white_value = \
                  min(round(percent_white * white_scale), white_scale)
              mqtt.async_publish(
                  self.hass, self._topic[CONF_WHITE_VALUE_COMMAND_TOPIC],
                  device_white_value, self._config.get(CONF_QOS),
                  self._config.get(CONF_RETAIN))
  
              if self._optimistic_white_value:
                  self._white_value = kwargs[ATTR_WHITE_VALUE]
                  should_update = True
  
          if on_command_type == 'last':
              mqtt.async_publish(self.hass, self._topic[CONF_COMMAND_TOPIC],
                                 self._payload['on'], self._config.get(CONF_QOS),
                                 self._config.get(CONF_RETAIN))
              should_update = True
  
          if self._optimistic:
              # Optimistically assume that the light has changed state.
              self._state = True
              should_update = True
  
          if should_update:
              self.async_schedule_update_ha_state()
  
      async def async_turn_off(self, **kwargs):
          """Turn the device off.
  
          This method is a coroutine.
          """
          mqtt.async_publish(
              self.hass, self._topic[CONF_COMMAND_TOPIC], self._payload['off'],
              self._config.get(CONF_QOS), self._config.get(CONF_RETAIN))
  
          if self._optimistic:
              # Optimistically assume that the light has changed state.
              self._state = False
              self.async_schedule_update_ha_state()
  