Improve volvooncall (#34495)

* Add write_ha_state to switch

* Add unique_id to voc

homeassistant/components/volvooncall/__init__.py

@@ -281,3 +281,8 @@ class VolvoEntity(Entity):
             self.instrument.attributes,
             model=f"{self.vehicle.vehicle_type}/{self.vehicle.model_year}",
         )
+
+    @property
+    def unique_id(self) -> str:
+        """Return a unique ID."""
+        return f"{self.vin}-{self.component}-{self.attribute}"

homeassistant/components/volvooncall/switch.py

@@ -26,7 +26,9 @@ class VolvoSwitch(VolvoEntity, ToggleEntity):
     async def async_turn_on(self, **kwargs):
         """Turn the switch on."""
         await self.instrument.turn_on()
+        self.async_write_ha_state()
 
     async def async_turn_off(self, **kwargs):
         """Turn the switch off."""
         await self.instrument.turn_off()
+        self.async_write_ha_state()