Add fjäråskupan sensor (#54921)

* Add fjäråskupan sensor

* Update homeassistant/components/fjaraskupan/sensor.py

Co-authored-by: Martin Hjelmare <marhje52@gmail.com>

* Type the return value of constructor

* Update __init__.py

Co-authored-by: Martin Hjelmare <marhje52@gmail.com>

.coveragerc

@@ -322,6 +322,7 @@ omit =
     homeassistant/components/fjaraskupan/const.py
     homeassistant/components/fjaraskupan/fan.py
     homeassistant/components/fjaraskupan/light.py
+    homeassistant/components/fjaraskupan/sensor.py
     homeassistant/components/fleetgo/device_tracker.py
     homeassistant/components/flexit/climate.py
     homeassistant/components/flic/binary_sensor.py

homeassistant/components/fjaraskupan/__init__.py

@@ -23,7 +23,7 @@ from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 
 from .const import DISPATCH_DETECTION, DOMAIN
 
-PLATFORMS = ["binary_sensor", "fan", "light"]
+PLATFORMS = ["binary_sensor", "fan", "light", "sensor"]
 
 _LOGGER = logging.getLogger(__name__)
 

homeassistant/components/fjaraskupan/sensor.py

@@ -0,0 +1,66 @@
+"""Support for sensors."""
+from __future__ import annotations
+
+from fjaraskupan import Device, State
+
+from homeassistant.components.sensor import (
+    DEVICE_CLASS_SIGNAL_STRENGTH,
+    STATE_CLASS_MEASUREMENT,
+    SensorEntity,
+)
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import SIGNAL_STRENGTH_DECIBELS_MILLIWATT
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity import DeviceInfo, Entity
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.typing import StateType
+from homeassistant.helpers.update_coordinator import (
+    CoordinatorEntity,
+    DataUpdateCoordinator,
+)
+
+from . import DeviceState, async_setup_entry_platform
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    config_entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Set up sensors dynamically through discovery."""
+
+    def _constructor(device_state: DeviceState) -> list[Entity]:
+        return [
+            RssiSensor(
+                device_state.coordinator, device_state.device, device_state.device_info
+            )
+        ]
+
+    async_setup_entry_platform(hass, config_entry, async_add_entities, _constructor)
+
+
+class RssiSensor(CoordinatorEntity[State], SensorEntity):
+    """Sensor device."""
+
+    def __init__(
+        self,
+        coordinator: DataUpdateCoordinator[State],
+        device: Device,
+        device_info: DeviceInfo,
+    ) -> None:
+        """Init sensor."""
+        super().__init__(coordinator)
+        self._attr_unique_id = f"{device.address}-signal-strength"
+        self._attr_device_info = device_info
+        self._attr_name = f"{device_info['name']} Signal Strength"
+        self._attr_device_class = DEVICE_CLASS_SIGNAL_STRENGTH
+        self._attr_state_class = STATE_CLASS_MEASUREMENT
+        self._attr_unit_of_measurement = SIGNAL_STRENGTH_DECIBELS_MILLIWATT
+        self._attr_entity_registry_enabled_default = False
+
+    @property
+    def native_value(self) -> StateType:
+        """Return the value reported by the sensor."""
+        if data := self.coordinator.data:
+            return data.rssi
+        return None