text: """Support for Decora dimmers."""
  from __future__ import annotations
  
  import copy
  from functools import wraps
  import logging
  import time
  
  from bluepy.btle import BTLEException  # pylint: disable=import-error
  import decora  # pylint: disable=import-error
  import voluptuous as vol
  
  from homeassistant import util
  from homeassistant.components.light import (
      ATTR_BRIGHTNESS,
      COLOR_MODE_BRIGHTNESS,
      PLATFORM_SCHEMA,
      LightEntity,
  )
  from homeassistant.const import CONF_API_KEY, CONF_DEVICES, CONF_NAME
  from homeassistant.core import HomeAssistant
  import homeassistant.helpers.config_validation as cv
  from homeassistant.helpers.entity_platform import AddEntitiesCallback
  from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
  
  _LOGGER = logging.getLogger(__name__)
  
  
  def _name_validator(config):
      """Validate the name."""
      config = copy.deepcopy(config)
      for address, device_config in config[CONF_DEVICES].items():
          if CONF_NAME not in device_config:
              device_config[CONF_NAME] = util.slugify(address)
  
      return config
  
  
  DEVICE_SCHEMA = vol.Schema(
      {vol.Optional(CONF_NAME): cv.string, vol.Required(CONF_API_KEY): cv.string}
  )
  
  PLATFORM_SCHEMA = vol.Schema(
      vol.All(
          PLATFORM_SCHEMA.extend(
              {vol.Optional(CONF_DEVICES, default={}): {cv.string: DEVICE_SCHEMA}}
          ),
          _name_validator,
      )
  )
  
  
  def retry(method):
      """Retry bluetooth commands."""
  
      @wraps(method)
      def wrapper_retry(device, *args, **kwargs):
          """Try send command and retry on error."""
  
          initial = time.monotonic()
          while True:
              if time.monotonic() - initial >= 10:
                  return None
              try:
                  return method(device, *args, **kwargs)
              except (decora.decoraException, AttributeError, BTLEException):
                  _LOGGER.warning(
                      "Decora connect error for device %s. Reconnecting",
                      device.name,
                  )
                  # pylint: disable=protected-access
                  device._switch.connect()
  
      return wrapper_retry
  
  
  def setup_platform(
      hass: HomeAssistant,
      config: ConfigType,
      add_entities: AddEntitiesCallback,
      discovery_info: DiscoveryInfoType | None = None,
  ) -> None:
      """Set up an Decora switch."""
      lights = []
      for address, device_config in config[CONF_DEVICES].items():
          device = {}
          device["name"] = device_config[CONF_NAME]
          device["key"] = device_config[CONF_API_KEY]
          device["address"] = address
          light = DecoraLight(device)
          lights.append(light)
  
      add_entities(lights)
  
  
  class DecoraLight(LightEntity):
      """Representation of an Decora light."""
  
      _attr_color_mode = COLOR_MODE_BRIGHTNESS
      _attr_supported_color_modes = {COLOR_MODE_BRIGHTNESS}
  
      def __init__(self, device):
          """Initialize the light."""
  
          self._name = device["name"]
          self._address = device["address"]
          self._key = device["key"]
          self._switch = decora.decora(self._address, self._key)
          self._brightness = 0
          self._state = False
  
      @property
      def unique_id(self):
          """Return the ID of this light."""
          return self._address
  
      @property
      def name(self):
          """Return the name of the device if any."""
          return self._name
  
      @property
      def is_on(self):
          """Return true if device is on."""
          return self._state
  
      @property
      def brightness(self):
          """Return the brightness of this light between 0..255."""
          return self._brightness
  
      @property
      def assumed_state(self):
          """We can read the actual state."""
          return False
  
      @retry
      def set_state(self, brightness):
          """Set the state of this lamp to the provided brightness."""
          self._switch.set_brightness(int(brightness / 2.55))
          self._brightness = brightness
  
      @retry
      def turn_on(self, **kwargs):
          """Turn the specified or all lights on."""
          brightness = kwargs.get(ATTR_BRIGHTNESS)
          self._switch.on()
          self._state = True
  
          if brightness is not None:
              self.set_state(brightness)
  
      @retry
      def turn_off(self, **kwargs):
          """Turn the specified or all lights off."""
          self._switch.off()
          self._state = False
  
      @retry
      def update(self):
          """Synchronise internal state with the actual light state."""
          self._brightness = self._switch.get_brightness() * 2.55
          self._state = self._switch.get_on()
  