Add binary sensor to Netatmo (#115119)

* Add binary sensor to Netatmo

* Update homeassistant/components/netatmo/binary_sensor.py

Co-authored-by: Jan-Philipp Benecke <github@bnck.me>

* Sigh

* Fix

* Fix

* Fix

---------

Co-authored-by: Jan-Philipp Benecke <github@bnck.me>

homeassistant/components/netatmo/binary_sensor.py

@@ -0,0 +1,60 @@
+"""Support for Netatmo binary sensors."""
+
+from homeassistant.components.binary_sensor import (
+    BinarySensorDeviceClass,
+    BinarySensorEntity,
+    BinarySensorEntityDescription,
+)
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant, callback
+from homeassistant.helpers.dispatcher import async_dispatcher_connect
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+
+from .const import NETATMO_CREATE_WEATHER_SENSOR
+from .data_handler import NetatmoDevice
+from .entity import NetatmoWeatherModuleEntity
+
+BINARY_SENSOR_TYPES: tuple[BinarySensorEntityDescription, ...] = (
+    BinarySensorEntityDescription(
+        key="reachable",
+        device_class=BinarySensorDeviceClass.CONNECTIVITY,
+    ),
+)
+
+
+async def async_setup_entry(
+    hass: HomeAssistant, entry: ConfigEntry, async_add_entities: AddEntitiesCallback
+) -> None:
+    """Set up Netatmo binary sensors based on a config entry."""
+
+    @callback
+    def _create_weather_binary_sensor_entity(netatmo_device: NetatmoDevice) -> None:
+        async_add_entities(
+            NetatmoWeatherBinarySensor(netatmo_device, description)
+            for description in BINARY_SENSOR_TYPES
+            if description.key in netatmo_device.device.features
+        )
+
+    entry.async_on_unload(
+        async_dispatcher_connect(
+            hass, NETATMO_CREATE_WEATHER_SENSOR, _create_weather_binary_sensor_entity
+        )
+    )
+
+
+class NetatmoWeatherBinarySensor(NetatmoWeatherModuleEntity, BinarySensorEntity):
+    """Implementation of a Netatmo binary sensor."""
+
+    def __init__(
+        self, device: NetatmoDevice, description: BinarySensorEntityDescription
+    ) -> None:
+        """Initialize a Netatmo binary sensor."""
+        super().__init__(device)
+        self.entity_description = description
+        self._attr_unique_id = f"{self.device.entity_id}-{description.key}"
+
+    @callback
+    def async_update_callback(self) -> None:
+        """Update the entity's state."""
+        self._attr_is_on = self.device.reachable
+        self.async_write_ha_state()