old_contents: """Support for Home Assistant Cloud binary sensors."""
  import asyncio
  
  from homeassistant.components.binary_sensor import (
      DEVICE_CLASS_CONNECTIVITY,
      BinarySensorEntity,
  )
  from homeassistant.helpers.dispatcher import async_dispatcher_connect
  
  from .const import DISPATCHER_REMOTE_UPDATE, DOMAIN
  
  WAIT_UNTIL_CHANGE = 3
  
  
  async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
      """Set up the cloud binary sensors."""
      if discovery_info is None:
          return
      cloud = hass.data[DOMAIN]
  
      async_add_entities([CloudRemoteBinary(cloud)])
  
  
  class CloudRemoteBinary(BinarySensorEntity):
      """Representation of an Cloud Remote UI Connection binary sensor."""
  
      def __init__(self, cloud):
          """Initialize the binary sensor."""
          self.cloud = cloud
          self._unsub_dispatcher = None
  
      @property
      def name(self) -> str:
          """Return the name of the binary sensor, if any."""
          return "Remote UI"
  
      @property
      def unique_id(self) -> str:
          """Return a unique ID."""
          return "cloud-remote-ui-connectivity"
  
      @property
      def is_on(self) -> bool:
          """Return true if the binary sensor is on."""
          return self.cloud.remote.is_connected
  
      @property
      def device_class(self) -> str:
          """Return the class of this device, from component DEVICE_CLASSES."""
          return DEVICE_CLASS_CONNECTIVITY
  
      @property
      def available(self) -> bool:
          """Return True if entity is available."""
          return self.cloud.remote.certificate is not None
  
      @property
      def should_poll(self) -> bool:
          """Return True if entity has to be polled for state."""
          return False
  
      async def async_added_to_hass(self):
          """Register update dispatcher."""
  
          async def async_state_update(data):
              """Update callback."""
              await asyncio.sleep(WAIT_UNTIL_CHANGE)
              self.async_write_ha_state()
  
          self._unsub_dispatcher = async_dispatcher_connect(
              self.hass, DISPATCHER_REMOTE_UPDATE, async_state_update
          )
  
      async def async_will_remove_from_hass(self):
          """Register update dispatcher."""
          if self._unsub_dispatcher is not None:
              self._unsub_dispatcher()
              self._unsub_dispatcher = None
  
new_contents: """Support for Home Assistant Cloud binary sensors."""
  import asyncio
  
  from homeassistant.components.binary_sensor import (
      DEVICE_CLASS_CONNECTIVITY,
      BinarySensorEntity,
  )
  from homeassistant.helpers.dispatcher import async_dispatcher_connect
  
  from .const import DISPATCHER_REMOTE_UPDATE, DOMAIN
  
  WAIT_UNTIL_CHANGE = 3
  
  
  async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
      """Set up the cloud binary sensors."""
      if discovery_info is None:
          return
      cloud = hass.data[DOMAIN]
  
      async_add_entities([CloudRemoteBinary(cloud)])
  
  
  class CloudRemoteBinary(BinarySensorEntity):
      """Representation of an Cloud Remote UI Connection binary sensor."""
  
      _attr_name = "Remote UI"
      _attr_device_class = DEVICE_CLASS_CONNECTIVITY
      _attr_should_poll = False
      _attr_unique_id = "cloud-remote-ui-connectivity"
  
      def __init__(self, cloud):
          """Initialize the binary sensor."""
          self.cloud = cloud
          self._unsub_dispatcher = None
  
      @property
      def is_on(self) -> bool:
          """Return true if the binary sensor is on."""
          return self.cloud.remote.is_connected
  
      @property
      def available(self) -> bool:
          """Return True if entity is available."""
          return self.cloud.remote.certificate is not None
  
      async def async_added_to_hass(self):
          """Register update dispatcher."""
  
          async def async_state_update(data):
              """Update callback."""
              await asyncio.sleep(WAIT_UNTIL_CHANGE)
              self.async_write_ha_state()
  
          self._unsub_dispatcher = async_dispatcher_connect(
              self.hass, DISPATCHER_REMOTE_UPDATE, async_state_update
          )
  
      async def async_will_remove_from_hass(self):
          """Register update dispatcher."""
          if self._unsub_dispatcher is not None:
              self._unsub_dispatcher()
              self._unsub_dispatcher = None
  
subject: Use entity class attributes for cloud (#53445)