Relay events for onoff and levelcontrol output clusters in ZHA (#19863)

* auto relay events for onoff and levelcontrol output clusters

* fix docstring

* correct copy/paste failure - review comment

* add space - review comment

homeassistant/components/zha/__init__.py

@@ -21,7 +21,7 @@ from homeassistant.helpers.entity_component import EntityComponent
 # Loading the config flow file will register the flow
 from . import config_flow  # noqa  # pylint: disable=unused-import
 from . import const as zha_const
-from .event import ZhaEvent
+from .event import ZhaEvent, ZhaRelayEvent
 from .const import (
     COMPONENTS, CONF_BAUDRATE, CONF_DATABASE, CONF_DEVICE_CONFIG,
     CONF_RADIO_TYPE, CONF_USB_PATH, DATA_ZHA, DATA_ZHA_BRIDGE_ID,
@@ -393,10 +393,18 @@ class ApplicationListener:
         if cluster.cluster_id in EVENTABLE_CLUSTERS:
             if cluster.endpoint.device.ieee not in self._events:
                 self._events.update({cluster.endpoint.device.ieee: []})
-            self._events[cluster.endpoint.device.ieee].append(ZhaEvent(
-                self._hass,
-                cluster
-            ))
+            from zigpy.zcl.clusters.general import OnOff, LevelControl
+            if discovery_attr == 'out_clusters' and \
+                    (cluster.cluster_id == OnOff.cluster_id or
+                     cluster.cluster_id == LevelControl.cluster_id):
+                self._events[cluster.endpoint.device.ieee].append(
+                    ZhaRelayEvent(self._hass, cluster)
+                )
+            else:
+                self._events[cluster.endpoint.device.ieee].append(ZhaEvent(
+                    self._hass,
+                    cluster
+                ))
 
         if cluster.cluster_id in profile_clusters:
             return

homeassistant/components/zha/event.py

@@ -67,3 +67,33 @@ class ZhaEvent():
             },
             EventOrigin.remote
         )
+
+
+class ZhaRelayEvent(ZhaEvent):
+    """Event relay that can be attached to zigbee clusters."""
+
+    @callback
+    def attribute_updated(self, attribute, value):
+        """Handle an attribute updated on this cluster."""
+        self.zha_send_event(
+            self._cluster,
+            'attribute_updated',
+            {
+                'attribute_id': attribute,
+                'attribute_name': self._cluster.attributes.get(
+                    attribute,
+                    ['Unknown'])[0],
+                'value': value
+            }
+        )
+
+    @callback
+    def cluster_command(self, tsn, command_id, args):
+        """Handle a cluster command received on this cluster."""
+        if self._cluster.server_commands is not None and\
+                self._cluster.server_commands.get(command_id) is not None:
+            self.zha_send_event(
+                self._cluster,
+                self._cluster.server_commands.get(command_id)[0],
+                args
+            )