Add unique id's to Vallox entities (#58459)

* Add unique id's to Vallox entities

* Cache uuid properties

Requested in code review.

Caching None isn't a problem as the underlying implementation of get_uuid
in the vallox_websocket_api library can never return None.

* Simplify get_uuid type check

Based on review comments.

* Set _attr_unique_id in init

* Import the library get_uuid under a different name

There are a few options here:

1. Rename the get_uuid method with a synonym
2. Import get_uuid under a different name
3. Convert get_uuid into a property
4. Rename get_uuid in the Vallox library

None of these options is that appealing. I'll start with option two,
anyways.

homeassistant/components/vallox/__init__.py

@@ -5,9 +5,11 @@ from dataclasses import dataclass, field
 import ipaddress
 import logging
 from typing import Any, NamedTuple
+from uuid import UUID
 
 from vallox_websocket_api import PROFILE as VALLOX_PROFILE, Vallox
 from vallox_websocket_api.exceptions import ValloxApiException
+from vallox_websocket_api.vallox import get_uuid as calculate_uuid
 import voluptuous as vol
 
 from homeassistant.const import CONF_HOST, CONF_NAME, EVENT_HOMEASSISTANT_STARTED
@@ -114,6 +116,13 @@ class ValloxState:
 
         return value
 
+    def get_uuid(self) -> UUID | None:
+        """Return cached UUID value."""
+        uuid = calculate_uuid(self.metric_cache)
+        if not isinstance(uuid, UUID):
+            raise ValueError
+        return uuid
+
 
 class ValloxDataUpdateCoordinator(DataUpdateCoordinator):
     """The DataUpdateCoordinator for Vallox."""

homeassistant/components/vallox/fan.py

@@ -99,6 +99,8 @@ class ValloxFan(CoordinatorEntity, FanEntity):
 
         self._attr_name = name
 
+        self._attr_unique_id = str(self.coordinator.data.get_uuid())
+
     @property
     def supported_features(self) -> int:
         """Flag supported features."""

homeassistant/components/vallox/sensor.py

@@ -52,6 +52,9 @@ class ValloxSensor(CoordinatorEntity, SensorEntity):
 
         self._attr_name = f"{name} {description.name}"
 
+        uuid = self.coordinator.data.get_uuid()
+        self._attr_unique_id = f"{uuid}-{description.key}"
+
     @property
     def native_value(self) -> StateType:
         """Return the value reported by the sensor."""