Use attr** in lightwave (#61881)

Co-authored-by: epenet <epenet@users.noreply.github.com>

homeassistant/components/lightwave/sensor.py

@@ -1,6 +1,10 @@
 """Support for LightwaveRF TRV - Associated Battery."""
-from homeassistant.components.sensor import STATE_CLASS_MEASUREMENT, SensorEntity
-from homeassistant.const import CONF_NAME, DEVICE_CLASS_BATTERY, PERCENTAGE
+from homeassistant.components.sensor import (
+    SensorDeviceClass,
+    SensorEntity,
+    SensorStateClass,
+)
+from homeassistant.const import CONF_NAME, PERCENTAGE
 
 from . import CONF_SERIAL, LIGHTWAVE_LINK
 
@@ -25,31 +29,20 @@ async def async_setup_platform(hass, config, async_add_entities, discovery_info=
 class LightwaveBattery(SensorEntity):
     """Lightwave TRV Battery."""
 
-    _attr_device_class = DEVICE_CLASS_BATTERY
+    _attr_device_class = SensorDeviceClass.BATTERY
     _attr_native_unit_of_measurement = PERCENTAGE
-    _attr_state_class = STATE_CLASS_MEASUREMENT
+    _attr_state_class = SensorStateClass.MEASUREMENT
 
     def __init__(self, name, lwlink, serial):
         """Initialize the Lightwave Trv battery sensor."""
-        self._name = name
-        self._state = None
+        self._attr_name = name
         self._lwlink = lwlink
         self._serial = serial
         self._attr_unique_id = f"{serial}-trv-battery"
 
-    @property
-    def name(self):
-        """Return the name of the sensor."""
-        return self._name
-
-    @property
-    def native_value(self):
-        """Return the state of the sensor."""
-        return self._state
-
     def update(self):
         """Communicate with a Lightwave RTF Proxy to get state."""
         (dummy_temp, dummy_targ, battery, dummy_output) = self._lwlink.read_trv_status(
             self._serial
         )
-        self._state = battery
+        self._attr_native_value = battery