Add unique_id for Ring (#17497)

homeassistant/components/sensor/ring.py

@@ -100,6 +100,7 @@ class RingSensor(Entity):
             self._data.name, SENSOR_TYPES.get(self._sensor_type)[0])
         self._state = STATE_UNKNOWN
         self._tz = str(hass.config.time_zone)
+        self._unique_id = '{}-{}'.format(self._data.id, self._sensor_type)
 
     @property
     def name(self):
@@ -111,6 +112,11 @@ class RingSensor(Entity):
         """Return the state of the sensor."""
         return self._state
 
+    @property
+    def unique_id(self):
+        """Return a unique ID."""
+        return self._unique_id
+
     @property
     def device_state_attributes(self):
         """Return the state attributes."""