Add extra attributes for device scanner, Nmap and Unifi (IP, SSID, etc.) (#13673)

* Start of development

* Add extra attributes from unifi scanner

* Store IP of the device in the state attributes with nmap

* Allow not defining get_extra_attributes method in derived classes

homeassistant/components/device_tracker/__init__.py

@@ -605,6 +605,17 @@ class DeviceScanner(object):
         """
         return self.hass.async_add_job(self.get_device_name, device)
 
+    def get_extra_attributes(self, device: str) -> dict:
+        """Get the extra attributes of a device."""
+        raise NotImplementedError()
+
+    def async_get_extra_attributes(self, device: str) -> Any:
+        """Get the extra attributes of a device.
+
+        This method must be run in the event loop and returns a coroutine.
+        """
+        return self.hass.async_add_job(self.get_extra_attributes, device)
+
 
 def load_config(path: str, hass: HomeAssistantType, consider_home: timedelta):
     """Load devices from YAML configuration file."""
@@ -690,10 +701,20 @@ def async_setup_scanner_platform(hass: HomeAssistantType, config: ConfigType,
                 host_name = yield from scanner.async_get_device_name(mac)
                 seen.add(mac)
 
+            try:
+                extra_attributes = (yield from
+                                    scanner.async_get_extra_attributes(mac))
+            except NotImplementedError:
+                extra_attributes = dict()
+
             kwargs = {
                 'mac': mac,
                 'host_name': host_name,
-                'source_type': SOURCE_TYPE_ROUTER
+                'source_type': SOURCE_TYPE_ROUTER,
+                'attributes': {
+                    'scanner': scanner.__class__.__name__,
+                    **extra_attributes
+                }
             }
 
             zone_home = hass.states.get(zone.ENTITY_ID_HOME)

homeassistant/components/device_tracker/nmap_tracker.py

@@ -80,6 +80,8 @@ class NmapDeviceScanner(DeviceScanner):
         """Scan for new devices and return a list with found device IDs."""
         self._update_info()
 
+        _LOGGER.debug("Nmap last results %s", self.last_results)
+
         return [device.mac for device in self.last_results]
 
     def get_device_name(self, device):
@@ -91,6 +93,15 @@ class NmapDeviceScanner(DeviceScanner):
             return filter_named[0]
         return None
 
+    def get_extra_attributes(self, device):
+        """Return the IP pf the given device."""
+        filter_ip = [result.ip for result in self.last_results
+                     if result.mac == device]
+
+        if filter_ip:
+            return {'ip': filter_ip[0]}
+        return None
+
     def _update_info(self):
         """Scan the network for devices.
 

homeassistant/components/device_tracker/unifi.py

@@ -122,3 +122,9 @@ class UnifiScanner(DeviceScanner):
         name = client.get('name') or client.get('hostname')
         _LOGGER.debug("Device mac %s name %s", device, name)
         return name
+
+    def get_extra_attributes(self, device):
+        """Return the extra attributes of the device."""
+        client = self._clients.get(device, {})
+        _LOGGER.debug("Device mac %s attributes %s", device, client)
+        return client