seems to work

apps/homekit/accessories/outlet.py

@@ -0,0 +1,57 @@
+"""
+Outlet/Relay Accessory Implementation for HomeKit
+
+Implements simple relay/outlet (on/off switch):
+- On (read/write)
+- OutletInUse (always true)
+"""
+
+from pyhap.accessory import Accessory
+from pyhap.const import CATEGORY_OUTLET
+
+
+class OutletAccessory(Accessory):
+    """Relay/Outlet for simple on/off control."""
+    
+    category = CATEGORY_OUTLET
+    
+    def __init__(self, driver, device, api_client, display_name=None, *args, **kwargs):
+        """
+        Initialize the outlet accessory.
+        
+        Args:
+            driver: HAP driver instance
+            device: Device object from DeviceRegistry
+            api_client: ApiClient for sending commands
+            display_name: Optional display name (defaults to device.friendly_name)
+        """
+        name = display_name or device.friendly_name or device.name
+        super().__init__(driver, name, *args, **kwargs)
+        self.device = device
+        self.api_client = api_client
+        
+        # Add Outlet service
+        self.outlet_service = self.add_preload_service('Outlet')
+        
+        # Get On characteristic and set callback
+        self.on_char = self.outlet_service.get_characteristic('On')
+        self.on_char.setter_callback = self.set_on
+        
+        # OutletInUse is always true (relay is always functional)
+        self.in_use_char = self.outlet_service.get_characteristic('OutletInUse')
+        self.in_use_char.set_value(True)
+    
+    def set_on(self, value):
+        """Called when HomeKit wants to turn outlet on/off."""
+        power_state = "on" if value else "off"
+        payload = {
+            "type": "relay",
+            "payload": {"power": power_state}
+        }
+        self.api_client.post_device_set(self.device.device_id, payload["type"], payload["payload"])
+    
+    def update_state(self, state_payload):
+        """Update state from API event."""
+        if "power" in state_payload:
+            is_on = state_payload["power"] == "on"
+            self.on_char.set_value(is_on)