Generate unique ID for sensors

custom_components/attributes/sensor.py

@@ -17,6 +17,7 @@
 from homeassistant.helpers.event import async_track_state_change
 from homeassistant.helpers.restore_state import RestoreEntity
 from homeassistant.helpers import template as template_helper
+from homeassistant.util import slugify
 
 __version__ = '1.1.0'
 
@@ -165,6 +166,7 @@ def __init__(self, hass, device_id, friendly_name, unit_of_measurement,
         self.entity_id = async_generate_entity_id(ENTITY_ID_FORMAT, device_id,
                                                   hass=hass)
         self._name = friendly_name
+        self._unique_id = slugify(f"{entity_id}_{device_id}")
         self._unit_of_measurement = unit_of_measurement
         self._template = state_template
         self._state = None
@@ -200,6 +202,11 @@ def name(self):
         """Return the name of the sensor."""
         return self._name
 
+    @property
+    def unique_id(self):
+        """Return the unique ID of the sensor."""
+        return self._unique_id
+
     @property
     def state(self):
         """Return the state of the sensor."""