Add local_ip unique_id & icon and single_instance_allowed (#33483)

* Add config flow + sensor unique_id & icon to local_ip

* single_instance_allowed

* Fix test

* Martin's review

* Name deprecated

homeassistant/components/local_ip/sensor.py

@@ -1,20 +1,22 @@
 """Sensor platform for local_ip."""
 
-from homeassistant.core import HomeAssistant
+from homeassistant.const import CONF_NAME
 from homeassistant.helpers.entity import Entity
 from homeassistant.util import get_local_ip
 
+from .const import DOMAIN, SENSOR
 
-async def async_setup_entry(hass: HomeAssistant, config_entry, async_add_entities):
+
+async def async_setup_entry(hass, config_entry, async_add_entities):
     """Set up the platform from config_entry."""
-    name = config_entry.data["name"]
+    name = config_entry.data.get(CONF_NAME) or DOMAIN
     async_add_entities([IPSensor(name)], True)
 
 
 class IPSensor(Entity):
     """A simple sensor."""
 
-    def __init__(self, name: str):
+    def __init__(self, name):
         """Initialize the sensor."""
         self._state = None
         self._name = name
@@ -24,11 +26,21 @@ class IPSensor(Entity):
         """Return the name of the sensor."""
         return self._name
 
+    @property
+    def unique_id(self):
+        """Return the unique id of the sensor."""
+        return SENSOR
+
     @property
     def state(self):
         """Return the state of the sensor."""
         return self._state
 
+    @property
+    def icon(self):
+        """Return the icon of the sensor."""
+        return "mdi:ip"
+
     def update(self):
         """Fetch new state data for the sensor."""
         self._state = get_local_ip()