fix 4

apps/api/main.py

@@ -25,11 +25,27 @@ from packages.home_capabilities import (
     ThermostatState,
     ContactState,
     TempHumidityState,
-    RelayState
+    RelayState,
+    load_layout,
+)
+
+# Import resolvers (must be before router imports to avoid circular dependency)
+from apps.api.resolvers import (
+    DeviceDTO,
+    resolve_group_devices,
+    resolve_scene_step_devices,
+    load_device_rooms,
+    get_room,
+    clear_room_cache,
 )
 
 logger = logging.getLogger(__name__)
 
+
+# ============================================================================
+# STATE CACHES
+# ============================================================================
+
 # In-memory cache for last known device states
 # Will be populated from Redis pub/sub messages
 device_states: dict[str, dict[str, Any]] = {}
@@ -57,6 +73,13 @@ app.add_middleware(
 )
 
 
+@app.on_event("startup")
+async def startup_event():
+    """Include routers after app is initialized to avoid circular imports."""
+    from apps.api.routes.groups_scenes import router as groups_scenes_router
+    app.include_router(groups_scenes_router, prefix="")
+
+
 @app.get("/health")
 async def health() -> dict[str, str]:
     """Health check endpoint.
@@ -207,6 +230,50 @@ def get_mqtt_settings() -> tuple[str, int]:
     return host, port
 
 
+# ============================================================================
+# MQTT PUBLISH
+# ============================================================================
+
+async def publish_abstract_set(device_type: str, device_id: str, payload: dict[str, Any]) -> None:
+    """
+    Publish an abstract set command via MQTT.
+    
+    This function encapsulates MQTT publishing logic so that group/scene
+    execution doesn't need to know MQTT topic details.
+    
+    Topic format: home/{device_type}/{device_id}/set
+    Message format: {"type": device_type, "payload": payload}
+    
+    Args:
+        device_type: Device type (light, thermostat, relay, etc.)
+        device_id: Device identifier
+        payload: Command payload (e.g., {"power": "on", "brightness": 50})
+        
+    Example:
+        >>> await publish_abstract_set("light", "kueche_deckenlampe", {"power": "on", "brightness": 35})
+        # Publishes to: home/light/kueche_deckenlampe/set
+        # Message: {"type": "light", "payload": {"power": "on", "brightness": 35}}
+    """
+    mqtt_host, mqtt_port = get_mqtt_settings()
+    topic = f"home/{device_type}/{device_id}/set"
+    message = {
+        "type": device_type,
+        "payload": payload
+    }
+    
+    try:
+        async with Client(hostname=mqtt_host, port=mqtt_port) as client:
+            await client.publish(
+                topic=topic,
+                payload=json.dumps(message),
+                qos=1
+            )
+            logger.info(f"Published to {topic}: {message}")
+    except Exception as e:
+        logger.error(f"Failed to publish to {topic}: {e}")
+        raise
+
+
 def get_redis_settings() -> tuple[str, str]:
     """Get Redis settings from configuration.
     
@@ -291,8 +358,6 @@ async def get_layout() -> dict[str, Any]:
     Returns:
         dict: Layout configuration with rooms and device tiles
     """
-    from packages.home_capabilities import load_layout
-    
     try:
         layout = load_layout()
         
@@ -321,6 +386,23 @@ async def get_layout() -> dict[str, Any]:
         return {"rooms": []}
 
 
+@app.get("/devices/{device_id}/room")
+async def get_device_room(device_id: str) -> dict[str, str | None]:
+    """Get the room name for a specific device.
+    
+    Args:
+        device_id: Device identifier
+        
+    Returns:
+        dict: {"device_id": str, "room": str | null}
+    """
+    room = get_room(device_id)
+    return {
+        "device_id": device_id,
+        "room": room
+    }
+
+
 @app.post("/devices/{device_id}/set", status_code=status.HTTP_202_ACCEPTED)
 async def set_device(device_id: str, request: SetDeviceRequest) -> dict[str, str]:
     """Set device state.

apps/api/resolvers.py

@@ -0,0 +1,286 @@
+"""Group and scene resolution logic."""
+
+import logging
+from pathlib import Path
+from typing import Any, TypedDict
+
+from packages.home_capabilities import (
+    GroupConfig,
+    GroupsConfigRoot,
+    SceneStep,
+    get_group_by_id,
+    load_layout,
+)
+
+logger = logging.getLogger(__name__)
+
+
+# ============================================================================
+# TYPE DEFINITIONS
+# ============================================================================
+
+class DeviceDTO(TypedDict, total=False):
+    """Device Data Transfer Object.
+    
+    Represents a device as returned by /devices endpoint or load_devices().
+    
+    Required fields:
+        device_id: Unique device identifier
+        type: Device type (light, thermostat, relay, etc.)
+    
+    Optional fields:
+        name: Human-readable device name
+        features: Device capabilities (power, brightness, etc.)
+        technology: MQTT, zigbee2mqtt, simulator, etc.
+        topics: MQTT topic configuration
+        metadata: Additional device information
+    """
+    device_id: str
+    type: str
+    name: str
+    features: dict[str, Any]
+    technology: str
+    topics: dict[str, str]
+    metadata: dict[str, Any]
+
+
+# ============================================================================
+# DEVICE-ROOM MAPPING
+# ============================================================================
+
+# Global cache for device -> room mapping
+_device_room_cache: dict[str, str] = {}
+
+
+def load_device_rooms(path: str | Path | None = None) -> dict[str, str]:
+    """
+    Load device-to-room mapping from layout configuration.
+    
+    This function extracts a mapping of device_id -> room_name from the layout.yaml
+    file, which is useful for resolving selectors like {room: "Küche"}.
+    
+    Args:
+        path: Optional path to layout.yaml. If None, uses default path
+              (config/layout.yaml relative to workspace root)
+    
+    Returns:
+        Dictionary mapping device_id to room_name. Returns empty dict if:
+        - layout.yaml doesn't exist
+        - layout.yaml is malformed
+        - layout.yaml is empty
+        
+    Example:
+        >>> mapping = load_device_rooms()
+        >>> mapping['kueche_lampe1']
+        'Küche'
+    """
+    global _device_room_cache
+    
+    try:
+        # Load the layout using existing function
+        layout = load_layout(path)
+        
+        # Build device -> room mapping
+        device_rooms: dict[str, str] = {}
+        for room in layout.rooms:
+            for device in room.devices:
+                device_rooms[device.device_id] = room.name
+        
+        # Update global cache
+        _device_room_cache = device_rooms.copy()
+        
+        logger.info(f"Loaded device-room mapping: {len(device_rooms)} devices")
+        return device_rooms
+        
+    except (FileNotFoundError, ValueError, Exception) as e:
+        logger.warning(f"Failed to load device-room mapping: {e}")
+        logger.warning("Returning empty device-room mapping")
+        _device_room_cache = {}
+        return {}
+
+
+def get_room(device_id: str) -> str | None:
+    """
+    Get the room name for a given device ID.
+    
+    This function uses the cached device-room mapping loaded by load_device_rooms().
+    If the cache is empty, it will attempt to load it first.
+    
+    Args:
+        device_id: The device identifier to lookup
+        
+    Returns:
+        Room name if device is found, None otherwise
+        
+    Example:
+        >>> get_room('kueche_lampe1')
+        'Küche'
+        >>> get_room('nonexistent_device')
+        None
+    """
+    # Check if cache is populated
+    if not _device_room_cache:
+        logger.debug("Device-room cache empty, loading from layout...")
+        # Load mapping (this updates the global _device_room_cache)
+        load_device_rooms()
+    
+    # Access the cache after potential reload
+    return _device_room_cache.get(device_id)
+
+
+def clear_room_cache() -> None:
+    """
+    Clear the cached device-room mapping.
+    
+    This is useful for testing or when the layout configuration has changed
+    and needs to be reloaded.
+    """
+    _device_room_cache.clear()
+    logger.debug("Cleared device-room cache")
+
+
+# ============================================================================
+# GROUP & SCENE RESOLUTION
+# ============================================================================
+
+def resolve_group_devices(
+    group: GroupConfig,
+    devices: list[DeviceDTO],
+    device_rooms: dict[str, str]
+) -> list[DeviceDTO]:
+    """
+    Resolve devices for a group based on device_ids or selector.
+    
+    Args:
+        group: Group configuration with device_ids or selector
+        devices: List of all available devices
+        device_rooms: Mapping of device_id -> room_name
+        
+    Returns:
+        List of devices matching the group criteria (no duplicates)
+        
+    Example:
+        >>> # Group with explicit device_ids
+        >>> group = GroupConfig(id="test", name="Test", device_ids=["lamp1", "lamp2"])
+        >>> resolve_group_devices(group, all_devices, {})
+        [{"device_id": "lamp1", ...}, {"device_id": "lamp2", ...}]
+        
+        >>> # Group with selector (all lights in kitchen)
+        >>> group = GroupConfig(
+        ...     id="kitchen_lights",
+        ...     name="Kitchen Lights",
+        ...     selector=GroupSelector(type="light", room="Küche")
+        ... )
+        >>> resolve_group_devices(group, all_devices, device_rooms)
+        [{"device_id": "kueche_deckenlampe", ...}, ...]
+    """
+    # Case 1: Explicit device_ids
+    if group.device_ids:
+        device_id_set = set(group.device_ids)
+        return [d for d in devices if d["device_id"] in device_id_set]
+    
+    # Case 2: Selector-based filtering
+    if group.selector:
+        filtered = []
+        
+        for device in devices:
+            # Filter by type (required in selector)
+            if device["type"] != group.selector.type:
+                continue
+            
+            # Filter by room (optional)
+            if group.selector.room:
+                device_room = device_rooms.get(device["device_id"])
+                if device_room != group.selector.room:
+                    continue
+            
+            # Filter by tags (optional, future feature)
+            # if group.selector.tags:
+            #     device_tags = device.get("metadata", {}).get("tags", [])
+            #     if not any(tag in device_tags for tag in group.selector.tags):
+            #         continue
+            
+            filtered.append(device)
+        
+        return filtered
+    
+    # No device_ids and no selector → empty list
+    return []
+
+
+def resolve_scene_step_devices(
+    step: SceneStep,
+    groups_config: GroupsConfigRoot,
+    devices: list[DeviceDTO],
+    device_rooms: dict[str, str]
+) -> list[DeviceDTO]:
+    """
+    Resolve devices for a scene step based on group_id or selector.
+    
+    Args:
+        step: Scene step with group_id or selector
+        groups_config: Groups configuration for group lookup
+        devices: List of all available devices
+        device_rooms: Mapping of device_id -> room_name
+        
+    Returns:
+        List of devices matching the step criteria
+        
+    Raises:
+        ValueError: If group_id is specified but group not found
+        
+    Example:
+        >>> # Step with group_id
+        >>> step = SceneStep(group_id="kitchen_lights", action={...})
+        >>> resolve_scene_step_devices(step, groups_cfg, all_devices, device_rooms)
+        [{"device_id": "kueche_deckenlampe", ...}, ...]
+        
+        >>> # Step with selector
+        >>> step = SceneStep(
+        ...     selector=SceneSelector(type="light", room="Küche"),
+        ...     action={...}
+        ... )
+        >>> resolve_scene_step_devices(step, groups_cfg, all_devices, device_rooms)
+        [{"device_id": "kueche_deckenlampe", ...}, ...]
+    """
+    # Case 1: Group reference
+    if step.group_id:
+        # Look up the group
+        group = get_group_by_id(groups_config, step.group_id)
+        
+        if not group:
+            raise ValueError(
+                f"Scene step references unknown group_id: '{step.group_id}'. "
+                f"Available groups: {[g.id for g in groups_config.groups]}"
+            )
+        
+        # Resolve the group's devices
+        return resolve_group_devices(group, devices, device_rooms)
+    
+    # Case 2: Direct selector
+    if step.selector:
+        filtered = []
+        
+        for device in devices:
+            # Filter by type (optional in scene selector)
+            if step.selector.type and device["type"] != step.selector.type:
+                continue
+            
+            # Filter by room (optional)
+            if step.selector.room:
+                device_room = device_rooms.get(device["device_id"])
+                if device_room != step.selector.room:
+                    continue
+            
+            # Filter by tags (optional, future feature)
+            # if step.selector.tags:
+            #     device_tags = device.get("metadata", {}).get("tags", [])
+            #     if not any(tag in device_tags for tag in step.selector.tags):
+            #         continue
+            
+            filtered.append(device)
+        
+        return filtered
+    
+    # Should not reach here due to SceneStep validation (must have group_id or selector)
+    return []

apps/api/routes/__init__.py

@@ -0,0 +1 @@
+"""API routes package."""

apps/api/routes/groups_scenes.py

@@ -0,0 +1,454 @@
+"""Groups and Scenes API routes."""
+
+import asyncio
+import logging
+from pathlib import Path
+from typing import Any
+
+from fastapi import APIRouter, HTTPException, status
+from pydantic import BaseModel
+
+from packages.home_capabilities import (
+    GroupConfig,
+    GroupsConfigRoot,
+    SceneConfig,
+    ScenesConfigRoot,
+    get_group_by_id,
+    get_scene_by_id,
+    load_groups,
+    load_scenes,
+)
+
+# Import from parent modules
+import sys
+sys.path.insert(0, str(Path(__file__).parent.parent))
+from resolvers import (
+    DeviceDTO,
+    resolve_group_devices,
+    resolve_scene_step_devices,
+    load_device_rooms,
+)
+from main import load_devices, publish_abstract_set
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter()
+
+
+# ============================================================================
+# REQUEST/RESPONSE MODELS
+# ============================================================================
+
+class GroupResponse(BaseModel):
+    """Response model for a group."""
+    id: str
+    name: str
+    device_count: int
+    devices: list[str]
+    selector: dict[str, Any] | None = None
+    capabilities: dict[str, bool]
+
+
+class GroupSetRequest(BaseModel):
+    """Request to set state for all devices in a group."""
+    action: dict[str, Any]  # e.g., {"type": "light", "payload": {"power": "on", "brightness": 50}}
+
+
+class SceneResponse(BaseModel):
+    """Response model for a scene."""
+    id: str
+    name: str
+    steps: int
+
+
+class SceneRunRequest(BaseModel):
+    """Request to execute a scene (currently empty, future: override params)."""
+    pass
+
+
+class SceneExecutionResponse(BaseModel):
+    """Response after scene execution."""
+    scene_id: str
+    scene_name: str
+    steps_executed: int
+    devices_affected: int
+    execution_plan: list[dict[str, Any]]
+
+
+# ============================================================================
+# GROUPS ENDPOINTS
+# ============================================================================
+
+@router.get("/groups", response_model=list[GroupResponse], tags=["groups"])
+async def list_groups() -> list[GroupResponse]:
+    """
+    List all available groups.
+    
+    Returns:
+        list[GroupResponse]: List of groups with their devices
+    """
+    try:
+        # Load configuration
+        groups_config = load_groups(Path(__file__).parent.parent.parent.parent / "config" / "groups.yaml")
+        devices = load_devices()
+        device_rooms = load_device_rooms()
+        
+        # Build response for each group
+        response = []
+        for group in groups_config.groups:
+            # Resolve devices for this group
+            resolved_devices = resolve_group_devices(group, devices, device_rooms)
+            device_ids = [d["device_id"] for d in resolved_devices]
+            
+            # Convert selector to dict if present
+            selector_dict = None
+            if group.selector:
+                selector_dict = {
+                    "type": group.selector.type,
+                    "room": group.selector.room,
+                    "tags": group.selector.tags,
+                }
+            
+            response.append(GroupResponse(
+                id=group.id,
+                name=group.name,
+                device_count=len(device_ids),
+                devices=device_ids,
+                selector=selector_dict,
+                capabilities=group.capabilities,
+            ))
+        
+        return response
+        
+    except Exception as e:
+        logger.error(f"Error loading groups: {e}")
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to load groups: {str(e)}"
+        )
+
+
+@router.get("/groups/{group_id}", response_model=GroupResponse, tags=["groups"])
+async def get_group(group_id: str) -> GroupResponse:
+    """
+    Get details for a specific group.
+    
+    Args:
+        group_id: Group identifier
+        
+    Returns:
+        GroupResponse: Group details with resolved devices
+    """
+    try:
+        # Load configuration
+        groups_config = load_groups(Path(__file__).parent.parent.parent.parent / "config" / "groups.yaml")
+        devices = load_devices()
+        device_rooms = load_device_rooms()
+        
+        # Find the group
+        group = get_group_by_id(groups_config, group_id)
+        if not group:
+            available_groups = [g.id for g in groups_config.groups]
+            raise HTTPException(
+                status_code=status.HTTP_404_NOT_FOUND,
+                detail=f"Group '{group_id}' not found. Available groups: {available_groups}"
+            )
+        
+        # Resolve devices
+        resolved_devices = resolve_group_devices(group, devices, device_rooms)
+        device_ids = [d["device_id"] for d in resolved_devices]
+        
+        # Convert selector to dict if present
+        selector_dict = None
+        if group.selector:
+            selector_dict = {
+                "type": group.selector.type,
+                "room": group.selector.room,
+                "tags": group.selector.tags,
+            }
+        
+        return GroupResponse(
+            id=group.id,
+            name=group.name,
+            device_count=len(device_ids),
+            devices=device_ids,
+            selector=selector_dict,
+            capabilities=group.capabilities,
+        )
+        
+    except HTTPException:
+        raise
+    except Exception as e:
+        logger.error(f"Error getting group {group_id}: {e}")
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to get group: {str(e)}"
+        )
+
+
+@router.post("/groups/{group_id}/set", status_code=status.HTTP_202_ACCEPTED, tags=["groups"])
+async def set_group(group_id: str, request: GroupSetRequest) -> dict[str, Any]:
+    """
+    Set state for all devices in a group.
+    
+    This endpoint resolves the group to its devices and would send
+    the action to each device. Currently returns execution plan.
+    
+    Args:
+        group_id: Group identifier
+        request: Action to apply to all devices in the group
+        
+    Returns:
+        dict: Execution plan (devices and actions to be executed)
+    """
+    try:
+        # Load configuration
+        groups_config = load_groups(Path(__file__).parent.parent.parent.parent / "config" / "groups.yaml")
+        devices = load_devices()
+        device_rooms = load_device_rooms()
+        
+        # Find the group
+        group = get_group_by_id(groups_config, group_id)
+        if not group:
+            available_groups = [g.id for g in groups_config.groups]
+            raise HTTPException(
+                status_code=status.HTTP_404_NOT_FOUND,
+                detail=f"Group '{group_id}' not found. Available groups: {available_groups}"
+            )
+        
+        # Resolve devices
+        resolved_devices = resolve_group_devices(group, devices, device_rooms)
+        
+        if not resolved_devices:
+            logger.warning(f"Group '{group_id}' resolved to 0 devices")
+        
+        # Execute actions via MQTT
+        execution_plan = []
+        for device in resolved_devices:
+            device_type = device["type"]
+            device_id = device["device_id"]
+            payload = request.action.get("payload", {})
+            
+            # Publish MQTT command
+            try:
+                await publish_abstract_set(device_type, device_id, payload)
+                execution_plan.append({
+                    "device_id": device_id,
+                    "device_type": device_type,
+                    "action": request.action,
+                    "status": "published"
+                })
+            except Exception as e:
+                logger.error(f"Failed to publish to {device_id}: {e}")
+                execution_plan.append({
+                    "device_id": device_id,
+                    "device_type": device_type,
+                    "action": request.action,
+                    "status": "failed",
+                    "error": str(e)
+                })
+        
+        return {
+            "group_id": group_id,
+            "group_name": group.name,
+            "devices_affected": len(resolved_devices),
+            "execution_plan": execution_plan,
+            "status": "executed"
+        }
+        
+    except HTTPException:
+        raise
+    except Exception as e:
+        logger.error(f"Error setting group {group_id}: {e}")
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to set group: {str(e)}"
+        )
+
+
+# ============================================================================
+# SCENES ENDPOINTS
+# ============================================================================
+
+@router.get("/scenes", response_model=list[SceneResponse], tags=["scenes"])
+async def list_scenes() -> list[SceneResponse]:
+    """
+    List all available scenes.
+    
+    Returns:
+        list[SceneResponse]: List of scenes
+    """
+    try:
+        # Load configuration
+        scenes_config = load_scenes(Path(__file__).parent.parent.parent.parent / "config" / "scenes.yaml")
+        
+        # Build response for each scene
+        response = []
+        for scene in scenes_config.scenes:
+            response.append(SceneResponse(
+                id=scene.id,
+                name=scene.name,
+                steps=len(scene.steps),
+            ))
+        
+        return response
+        
+    except Exception as e:
+        logger.error(f"Error loading scenes: {e}")
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to load scenes: {str(e)}"
+        )
+
+
+@router.get("/scenes/{scene_id}", response_model=SceneResponse, tags=["scenes"])
+async def get_scene(scene_id: str) -> SceneResponse:
+    """
+    Get details for a specific scene.
+    
+    Args:
+        scene_id: Scene identifier
+        
+    Returns:
+        SceneResponse: Scene details
+    """
+    try:
+        # Load configuration
+        scenes_config = load_scenes(Path(__file__).parent.parent.parent.parent / "config" / "scenes.yaml")
+        
+        # Find the scene
+        scene = get_scene_by_id(scenes_config, scene_id)
+        if not scene:
+            available_scenes = [s.id for s in scenes_config.scenes]
+            raise HTTPException(
+                status_code=status.HTTP_404_NOT_FOUND,
+                detail=f"Scene '{scene_id}' not found. Available scenes: {available_scenes}"
+            )
+        
+        return SceneResponse(
+            id=scene.id,
+            name=scene.name,
+            steps=len(scene.steps),
+        )
+        
+    except HTTPException:
+        raise
+    except Exception as e:
+        logger.error(f"Error getting scene {scene_id}: {e}")
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to get scene: {str(e)}"
+        )
+
+
+@router.post("/scenes/{scene_id}/run", response_model=SceneExecutionResponse, tags=["scenes"])
+async def run_scene(scene_id: str, request: SceneRunRequest | None = None) -> SceneExecutionResponse:
+    """
+    Execute a scene.
+    
+    This endpoint resolves each step in the scene to its target devices
+    and would execute the actions. Currently returns execution plan.
+    
+    Args:
+        scene_id: Scene identifier
+        request: Optional execution parameters (reserved for future use)
+        
+    Returns:
+        SceneExecutionResponse: Execution plan and summary
+    """
+    try:
+        # Load configuration
+        scenes_config = load_scenes(Path(__file__).parent.parent.parent.parent / "config" / "scenes.yaml")
+        groups_config = load_groups(Path(__file__).parent.parent.parent.parent / "config" / "groups.yaml")
+        devices = load_devices()
+        device_rooms = load_device_rooms()
+        
+        # Find the scene
+        scene = get_scene_by_id(scenes_config, scene_id)
+        if not scene:
+            available_scenes = [s.id for s in scenes_config.scenes]
+            raise HTTPException(
+                status_code=status.HTTP_404_NOT_FOUND,
+                detail=f"Scene '{scene_id}' not found. Available scenes: {available_scenes}"
+            )
+        
+        # Execute scene steps
+        execution_plan = []
+        total_devices = 0
+        
+        for i, step in enumerate(scene.steps, 1):
+            # Resolve devices for this step
+            resolved_devices = resolve_scene_step_devices(step, groups_config, devices, device_rooms)
+            total_devices += len(resolved_devices)
+            
+            # Extract action payload
+            action_payload = step.action.get("payload", {})
+            
+            # Execute for each device
+            step_executions = []
+            for device in resolved_devices:
+                device_type = device["type"]
+                device_id = device["device_id"]
+                
+                try:
+                    await publish_abstract_set(device_type, device_id, action_payload)
+                    step_executions.append({
+                        "device_id": device_id,
+                        "status": "published"
+                    })
+                except Exception as e:
+                    logger.error(f"Failed to publish to {device_id} in step {i}: {e}")
+                    step_executions.append({
+                        "device_id": device_id,
+                        "status": "failed",
+                        "error": str(e)
+                    })
+            
+            # Build step info
+            step_info = {
+                "step": i,
+                "devices_affected": len(resolved_devices),
+                "device_ids": [d["device_id"] for d in resolved_devices],
+                "action": step.action,
+                "executions": step_executions,
+            }
+            
+            # Add targeting info
+            if step.group_id:
+                step_info["target"] = {"type": "group_id", "value": step.group_id}
+            elif step.selector:
+                step_info["target"] = {
+                    "type": "selector",
+                    "selector_type": step.selector.type,
+                    "room": step.selector.room,
+                }
+            
+            if step.delay_ms:
+                step_info["delay_ms"] = step.delay_ms
+                # Apply delay before next step
+                await asyncio.sleep(step.delay_ms / 1000.0)
+            
+            execution_plan.append(step_info)
+        
+        return SceneExecutionResponse(
+            scene_id=scene.id,
+            scene_name=scene.name,
+            steps_executed=len(scene.steps),
+            devices_affected=total_devices,
+            execution_plan=execution_plan,
+        )
+        
+    except HTTPException:
+        raise
+    except ValueError as e:
+        # Handle unknown group_id in scene step
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=str(e)
+        )
+    except Exception as e:
+        logger.error(f"Error running scene {scene_id}: {e}")
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to run scene: {str(e)}"
+        )

apps/rules/rule_interface.py

@@ -246,6 +246,23 @@ class RedisState:
         
         await self._execute_with_retry(_expire, key, ttl_secs)
     
+    async def delete(self, key: str) -> None:
+        """
+        Delete a key from Redis.
+        
+        Args:
+            key: Redis key to delete
+            
+        Example:
+            >>> state = RedisState("redis://localhost:6379/0")
+            >>> await state.set("rules:r1:temp", "22.5")
+            >>> await state.delete("rules:r1:temp")
+        """
+        async def _delete(client, k):
+            await client.delete(k)
+        
+        await self._execute_with_retry(_delete, key)
+    
     async def close(self) -> None:
         """
         Close Redis connection and cleanup resources.

apps/ui/static/favicon.svg

@@ -0,0 +1,13 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
+  <!-- Roof -->
+  <path d="M50 10 L90 45 L85 45 L85 50 L15 50 L15 45 L10 45 Z" fill="#667eea" stroke="#4c51bf" stroke-width="2" stroke-linejoin="round"/>
+  <!-- House body -->
+  <rect x="15" y="45" width="70" height="45" fill="#764ba2" stroke="#4c51bf" stroke-width="2"/>
+  <!-- Door -->
+  <rect x="35" y="60" width="15" height="30" fill="#4c51bf" rx="2"/>
+  <!-- Window -->
+  <rect x="60" y="60" width="20" height="15" fill="#fbbf24" stroke="#f59e0b" stroke-width="1"/>
+  <!-- Window panes -->
+  <line x1="70" y1="60" x2="70" y2="75" stroke="#f59e0b" stroke-width="1"/>
+  <line x1="60" y1="67.5" x2="80" y2="67.5" stroke="#f59e0b" stroke-width="1"/>
+</svg>

apps/ui/templates/dashboard.html

@@ -4,6 +4,7 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Home Automation</title>
+    <link rel="icon" type="image/svg+xml" href="/static/favicon.svg">
     <style>
         * {
             margin: 0;
@@ -165,6 +166,12 @@
             margin: 0;
         }
         
+        .room-title h2 {
+            font-size: 1.5rem;
+            font-weight: 700;
+            margin: 0;
+        }
+        
         .room-toggle {
             font-size: 1.5rem;
             color: #667eea;
@@ -358,32 +365,57 @@
             color: #999;
         }
         
-        .temp-controls {
-            display: flex;
-            gap: 0.5rem;
-            margin-bottom: 1rem;
+        /* Thermostat Slider Styles */
+        .thermostat-slider-control {
+            margin: 1rem 0;
         }
         
-        .temp-button {
-            flex: 1;
-            padding: 0.75rem;
-            border: none;
-            border-radius: 8px;
-            font-size: 1.125rem;
-            font-weight: 700;
+        .thermostat-slider-label {
+            font-size: 0.875rem;
+            color: #666;
+            display: block;
+            margin-bottom: 0.5rem;
+        }
+        
+        .thermostat-slider {
+            width: 100%;
+            height: 8px;
+            border-radius: 4px;
+            background: linear-gradient(to right, #667eea 0%, #764ba2 100%);
+            outline: none;
+            -webkit-appearance: none;
+            appearance: none;
             cursor: pointer;
-            transition: all 0.2s;
-            background: #667eea;
-            color: white;
-            min-height: 44px;
         }
         
-        .temp-button:hover {
-            background: #5568d3;
+        .thermostat-slider::-webkit-slider-thumb {
+            -webkit-appearance: none;
+            appearance: none;
+            width: 24px;
+            height: 24px;
+            border-radius: 50%;
+            background: white;
+            border: 3px solid #667eea;
+            cursor: pointer;
+            box-shadow: 0 2px 4px rgba(0,0,0,0.2);
         }
         
-        .temp-button:active {
-            transform: scale(0.95);
+        .thermostat-slider::-moz-range-thumb {
+            width: 24px;
+            height: 24px;
+            border-radius: 50%;
+            background: white;
+            border: 3px solid #667eea;
+            cursor: pointer;
+            box-shadow: 0 2px 4px rgba(0,0,0,0.2);
+        }
+        
+        .thermostat-slider-range {
+            display: flex;
+            justify-content: space-between;
+            margin-top: 0.25rem;
+            font-size: 0.75rem;
+            color: #999;
         }
         
         /* Contact Sensor Styles */
@@ -391,6 +423,7 @@
             display: flex;
             align-items: center;
             gap: 0.75rem;
+
             padding: 1rem;
             background: #f8f9fa;
             border-radius: 8px;
@@ -478,6 +511,208 @@
             text-align: center;
         }
         
+        /* Groups Section Styles */
+        .groups-section .devices {
+            display: grid;
+            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
+            gap: 1rem;
+        }
+        
+        .group-card {
+            background: white;
+            border-radius: 12px;
+            padding: 1.25rem;
+            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
+            transition: all 0.3s;
+        }
+        
+        .group-card:hover {
+            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
+            transform: translateY(-2px);
+        }
+        
+        .group-card-header {
+            margin-bottom: 1rem;
+        }
+        
+        .group-card-title {
+            font-size: 1.125rem;
+            font-weight: 600;
+            color: #333;
+            margin-bottom: 0.25rem;
+        }
+        
+        .group-card-subtitle {
+            font-size: 0.875rem;
+            color: #666;
+        }
+        
+        .group-card-actions {
+            display: flex;
+            gap: 0.5rem;
+        }
+        
+        .group-button {
+            flex: 1;
+            padding: 0.75rem;
+            border: none;
+            border-radius: 8px;
+            font-size: 0.875rem;
+            font-weight: 600;
+            cursor: pointer;
+            transition: all 0.2s;
+            min-height: 44px;
+            position: relative;
+        }
+        
+        .group-button.on {
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+            color: white;
+        }
+        
+        .group-button.on:hover {
+            background: linear-gradient(135deg, #5568d3 0%, #653a8e 100%);
+        }
+        
+        .group-button.off {
+            background: #f1f3f5;
+            color: #495057;
+        }
+        
+        .group-button.off:hover {
+            background: #e9ecef;
+        }
+        
+        .group-button:active {
+            transform: scale(0.95);
+        }
+        
+        .group-button:disabled {
+            opacity: 0.6;
+            cursor: not-allowed;
+        }
+        
+        .group-button .spinner {
+            display: inline-block;
+            width: 14px;
+            height: 14px;
+            border: 2px solid rgba(255, 255, 255, 0.3);
+            border-top-color: white;
+            border-radius: 50%;
+            animation: spin 0.6s linear infinite;
+        }
+        
+        /* Scenes Section Styles */
+        .scenes-section .devices {
+            display: grid;
+            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+            gap: 1rem;
+        }
+        
+        .scene-button {
+            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
+            color: white;
+            border: none;
+            border-radius: 12px;
+            padding: 1.25rem;
+            font-size: 1rem;
+            font-weight: 600;
+            cursor: pointer;
+            transition: all 0.3s;
+            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
+            min-height: 80px;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            position: relative;
+        }
+        
+        .scene-button:hover {
+            background: linear-gradient(135deg, #e082ea 0%, #e4465b 100%);
+            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
+            transform: translateY(-2px);
+        }
+        
+        .scene-button:active {
+            transform: translateY(0) scale(0.95);
+        }
+        
+        .scene-button:disabled {
+            opacity: 0.6;
+            cursor: not-allowed;
+        }
+        
+        .scene-button .spinner {
+            display: inline-block;
+            width: 16px;
+            height: 16px;
+            border: 2px solid rgba(255, 255, 255, 0.3);
+            border-top-color: white;
+            border-radius: 50%;
+            animation: spin 0.6s linear infinite;
+            margin-left: 0.5rem;
+        }
+        
+        @keyframes spin {
+            to { transform: rotate(360deg); }
+        }
+        
+        /* Toast Notification */
+        .toast {
+            position: fixed;
+            bottom: 2rem;
+            right: 2rem;
+            background: white;
+            padding: 1rem 1.5rem;
+            border-radius: 8px;
+            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
+            display: flex;
+            align-items: center;
+            gap: 0.75rem;
+            z-index: 1000;
+            animation: slideIn 0.3s ease;
+            max-width: 400px;
+        }
+        
+        @keyframes slideIn {
+            from {
+                transform: translateX(100%);
+                opacity: 0;
+            }
+            to {
+                transform: translateX(0);
+                opacity: 1;
+            }
+        }
+        
+        .toast.success {
+            border-left: 4px solid #51cf66;
+        }
+        
+        .toast.error {
+            border-left: 4px solid #ff6b6b;
+        }
+        
+        .toast-icon {
+            font-size: 1.5rem;
+        }
+        
+        .toast-message {
+            flex: 1;
+            color: #333;
+            font-size: 0.875rem;
+        }
+        
+        .toast-close {
+            background: none;
+            border: none;
+            color: #999;
+            cursor: pointer;
+            font-size: 1.25rem;
+            padding: 0;
+            line-height: 1;
+        }
+        
         .events {
             margin-top: 2rem;
             background: white;
@@ -534,6 +769,106 @@
             font-size: 0.875rem;
             color: #999;
         }
+        
+        /* Responsive Design */
+        @media (max-width: 768px) {
+            .container {
+                padding: 1rem;
+            }
+            
+            header {
+                padding: 1rem;
+            }
+            
+            .header-content h1 {
+                font-size: 1.5rem;
+            }
+            
+            .header-content p {
+                font-size: 0.75rem;
+            }
+            
+            .header-buttons {
+                gap: 0.5rem;
+            }
+            
+            .refresh-btn, .collapse-all-btn {
+                width: 36px;
+                height: 36px;
+                font-size: 1.25rem;
+            }
+            
+            .room {
+                padding: 1rem;
+            }
+            
+            .room-header h2 {
+                font-size: 1.125rem;
+            }
+            
+            .devices {
+                grid-template-columns: 1fr;
+            }
+            
+            /* Groups responsive */
+            .groups-section .devices {
+                grid-template-columns: 1fr;
+            }
+            
+            .group-card {
+                padding: 1rem;
+            }
+            
+            .group-card-title {
+                font-size: 1rem;
+            }
+            
+            /* Scenes responsive */
+            .scenes-section .devices {
+                grid-template-columns: 1fr;
+            }
+            
+            .scene-button {
+                min-height: 60px;
+                font-size: 0.9375rem;
+            }
+            
+            /* Toast responsive */
+            .toast {
+                bottom: 1rem;
+                right: 1rem;
+                left: 1rem;
+                max-width: none;
+            }
+            
+            /* Thermostat responsive */
+            .thermostat-display {
+                grid-template-columns: 1fr;
+                gap: 0.75rem;
+            }
+            
+            .temp-controls {
+                flex-direction: column;
+            }
+            
+            .temp-button {
+                width: 100%;
+            }
+        }
+        
+        @media (min-width: 769px) and (max-width: 1024px) {
+            .devices {
+                grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
+            }
+            
+            .groups-section .devices {
+                grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
+            }
+            
+            .scenes-section .devices {
+                grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
+            }
+        }
     </style>
 </head>
 <body>
@@ -656,13 +991,23 @@
                             </div>
                         </div>
                         
-                        <div class="temp-controls">
-                            <button class="temp-button" onclick="adjustTarget('{{ device.device_id }}', -1.0)">
-                                -1.0
-                            </button>
-                            <button class="temp-button" onclick="adjustTarget('{{ device.device_id }}', 1.0)">
-                                +1.0
-                            </button>
+                        <div class="thermostat-slider-control">
+                            <label for="slider-{{ device.device_id }}" class="thermostat-slider-label">
+                                🎯 Zieltemperatur: <span id="thermostat-slider-value-{{ device.device_id }}">21.0</span>°C
+                            </label>
+                            <input type="range" 
+                                   min="5" 
+                                   max="30" 
+                                   step="0.5" 
+                                   value="21.0" 
+                                   class="thermostat-slider"
+                                   id="slider-{{ device.device_id }}"
+                                   oninput="updateThermostatSliderValue('{{ device.device_id }}', this.value)"
+                                   onchange="setThermostatTarget('{{ device.device_id }}', this.value)">
+                            <div class="thermostat-slider-range">
+                                <span>5°C</span>
+                                <span>30°C</span>
+                            </div>
                         </div>
                         
                         {% elif device.type == "contact" or device.type == "contact_sensor" %}
@@ -712,6 +1057,38 @@
             </div>
         {% endif %}
         
+        <!-- Groups Section -->
+        <section class="room groups-section">
+            <div class="room-header" onclick="toggleRoom('groups-content')">
+                <div class="room-title">
+                    <h2>🎛️ Gruppen</h2>
+                    <span class="device-count" id="groups-count">Lädt...</span>
+                </div>
+                <span class="room-toggle collapsed" id="toggle-groups-content">▼</span>
+            </div>
+            <div class="room-content collapsed" id="groups-content">
+                <div class="devices" id="groups-container">
+                    <p style="color: #666;">Lade Gruppen...</p>
+                </div>
+            </div>
+        </section>
+        
+        <!-- Scenes Section -->
+        <section class="room scenes-section">
+            <div class="room-header" onclick="toggleRoom('scenes-content')">
+                <div class="room-title">
+                    <h2>🎬 Szenen</h2>
+                    <span class="device-count" id="scenes-count">Lädt...</span>
+                </div>
+                <span class="room-toggle collapsed" id="toggle-scenes-content">▼</span>
+            </div>
+            <div class="room-content collapsed" id="scenes-content">
+                <div class="devices" id="scenes-container">
+                    <p style="color: #666;">Lade Szenen...</p>
+                </div>
+            </div>
+        </section>
+        
         <div class="events">
             <h2>📡 Realtime Events</h2>
             <div class="event-list" id="event-list">
@@ -767,7 +1144,8 @@
         
         // Set room icons based on room name
         document.addEventListener('DOMContentLoaded', () => {
-            const roomTitles = document.querySelectorAll('.room-title');
+            // Only select room titles that are <h2> elements (exclude Groups/Scenes sections)
+            const roomTitles = document.querySelectorAll('.room-title:not(.groups-section .room-title):not(.scenes-section .room-title)');
             roomTitles.forEach(title => {
                 const roomName = title.textContent.trim().toLowerCase();
                 let icon = '🏠'; // Default
@@ -985,6 +1363,8 @@
         function updateThermostatUI(deviceId, current, target, mode) {
             const currentSpan = document.getElementById(`state-${deviceId}-current`);
             const targetSpan = document.getElementById(`state-${deviceId}-target`);
+            const slider = document.getElementById(`slider-${deviceId}`);
+            const sliderValueSpan = document.getElementById(`thermostat-slider-value-${deviceId}`);
             
             if (current !== undefined && currentSpan) {
                 currentSpan.textContent = current.toFixed(1);
@@ -994,6 +1374,14 @@
                 if (targetSpan) {
                     targetSpan.textContent = target.toFixed(1);
                 }
+                // Sync slider with actual state
+                if (slider) {
+                    slider.value = target;
+                }
+                // Sync slider value display
+                if (sliderValueSpan) {
+                    sliderValueSpan.textContent = target.toFixed(1);
+                }
                 thermostatTargets[deviceId] = target;
             }
         }
@@ -1259,6 +1647,317 @@
         loadDevices().then(() => {
             console.log('Initial states loaded, now connecting SSE...');
         });
+        
+        // ===== GROUPS & SCENES FUNCTIONALITY =====
+        
+        // Show toast notification
+        function showToast(message, type = 'success') {
+            // Remove existing toasts
+            document.querySelectorAll('.toast').forEach(t => t.remove());
+            
+            const toast = document.createElement('div');
+            toast.className = `toast ${type}`;
+            toast.innerHTML = `
+                <span class="toast-icon">${type === 'success' ? '✓' : '✗'}</span>
+                <span class="toast-message">${message}</span>
+                <button class="toast-close" onclick="this.parentElement.remove()">×</button>
+            `;
+            document.body.appendChild(toast);
+            
+            // Auto-remove after 4 seconds
+            setTimeout(() => {
+                toast.style.animation = 'slideIn 0.3s ease reverse';
+                setTimeout(() => toast.remove(), 300);
+            }, 4000);
+        }
+        
+        // Load and render groups
+        async function loadGroups() {
+            try {
+                const response = await fetch(api('/groups'));
+                if (!response.ok) throw new Error('Failed to load groups');
+                
+                const groups = await response.json();
+                const container = document.getElementById('groups-container');
+                const countSpan = document.getElementById('groups-count');
+                
+                if (groups.length === 0) {
+                    container.innerHTML = '<p style="color: #666;">Keine Gruppen konfiguriert.</p>';
+                    countSpan.textContent = '';
+                    return;
+                }
+                
+                countSpan.textContent = '';
+                
+                container.innerHTML = groups.map(group => `
+                    <div class="group-card">
+                        <div class="group-card-header">
+                            <div class="group-card-title">${group.name}</div>
+                            <div class="group-card-subtitle">${group.device_count} ${group.device_count === 1 ? 'Gerät' : 'Geräte'}</div>
+                        </div>
+                        ${group.capabilities.brightness ? `
+                        <div class="brightness-control">
+                            <label class="brightness-label">
+                                <span>🔆 Helligkeit</span>
+                                <span class="brightness-value" id="group-brightness-${group.id}">50%</span>
+                            </label>
+                            <input type="range" 
+                                   min="0" 
+                                   max="100" 
+                                   value="50" 
+                                   class="brightness-slider"
+                                   id="slider-group-${group.id}"
+                                   oninput="updateGroupBrightnessDisplay('${group.id}', this.value)"
+                                   onchange="setGroupBrightness('${group.id}', this.value)">
+                        </div>
+                        ` : ''}
+                        <div class="group-card-actions">
+                            <button class="group-button on" onclick="setGroup('${group.id}', 'on', this)">
+                                Alle An
+                            </button>
+                            <button class="group-button off" onclick="setGroup('${group.id}', 'off', this)">
+                                Alle Aus
+                            </button>
+                        </div>
+                    </div>
+                `).join('');
+                
+                console.log(`Loaded ${groups.length} groups`);
+            } catch (error) {
+                console.error('Failed to load groups:', error);
+                const container = document.getElementById('groups-container');
+                container.innerHTML = '<p style="color: #999;">Fehler beim Laden der Gruppen</p>';
+                showToast('Fehler beim Laden der Gruppen', 'error');
+            }
+        }
+        
+        // Update group brightness display value
+        function updateGroupBrightnessDisplay(groupId, value) {
+            const display = document.getElementById(`group-brightness-${groupId}`);
+            if (display) {
+                display.textContent = `${value}%`;
+            }
+        }
+        
+        // Set group brightness immediately when slider changes
+        async function setGroupBrightness(groupId, brightness) {
+            try {
+                const response = await fetch(api(`/groups/${groupId}/set`), {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({
+                        action: {
+                            type: 'power',
+                            payload: {
+                                power: 'on',
+                                brightness: parseInt(brightness)
+                            }
+                        }
+                    })
+                });
+                
+                if (!response.ok) {
+                    const error = await response.json();
+                    throw new Error(error.detail || 'Request failed');
+                }
+                
+                const result = await response.json();
+                const publishedCount = result.execution_plan.filter(p => p.status === 'published').length;
+                
+                console.log(`Group ${groupId} brightness set to ${brightness}%: ${publishedCount} devices`);
+                
+                addEvent({
+                    action: 'group_brightness',
+                    group_id: groupId,
+                    brightness: brightness,
+                    device_count: publishedCount
+                });
+                
+            } catch (error) {
+                console.error('Failed to set group brightness:', error);
+                showToast(`Fehler beim Setzen der Helligkeit: ${error.message}`, 'error');
+            }
+        }
+        
+        // Update thermostat slider value display while dragging
+        function updateThermostatSliderValue(deviceId, value) {
+            const valueSpan = document.getElementById(`thermostat-slider-value-${deviceId}`);
+            if (valueSpan) {
+                valueSpan.textContent = parseFloat(value).toFixed(1);
+            }
+        }
+        
+        // Set thermostat target temperature when slider is released
+        async function setThermostatTarget(deviceId, value) {
+            try {
+                const targetTemp = parseFloat(value);
+                
+                const response = await fetch(api(`/devices/${deviceId}/set`), {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({
+                        type: 'thermostat',
+                        payload: {
+                            target: targetTemp
+                        }
+                    })
+                });
+                
+                if (!response.ok) {
+                    const error = await response.json();
+                    throw new Error(error.detail || 'Request failed');
+                }
+                
+                console.log(`Thermostat ${deviceId} target set to ${targetTemp}°C`);
+                
+                addEvent({
+                    action: 'thermostat_set',
+                    device_id: deviceId,
+                    target_temperature: targetTemp
+                });
+                
+            } catch (error) {
+                console.error('Failed to set thermostat target:', error);
+                showToast(`Fehler beim Setzen der Zieltemperatur: ${error.message}`, 'error');
+            }
+        }
+        
+        // Execute group action
+        async function setGroup(groupId, power, buttonElement) {
+            const allButtons = buttonElement.parentElement.querySelectorAll('button');
+            allButtons.forEach(btn => btn.disabled = true);
+            
+            const originalHTML = buttonElement.innerHTML;
+            buttonElement.innerHTML = '<span class="spinner"></span>';
+            
+            // Get brightness value if slider exists
+            const slider = document.getElementById(`slider-group-${groupId}`);
+            const brightness = slider ? parseInt(slider.value) : null;
+            
+            try {
+                const payload = { power };
+                if (brightness !== null && power === 'on') {
+                    payload.brightness = brightness;
+                }
+                
+                const response = await fetch(api(`/groups/${groupId}/set`), {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({
+                        action: {
+                            type: 'power',
+                            payload: payload
+                        }
+                    })
+                });
+                
+                if (!response.ok) {
+                    const error = await response.json();
+                    throw new Error(error.detail || 'Request failed');
+                }
+                
+                const result = await response.json();
+                const publishedCount = result.execution_plan.filter(p => p.status === 'published').length;
+                
+                showToast(`Gruppe ${power === 'on' ? 'eingeschaltet' : 'ausgeschaltet'}: ${publishedCount} Geräte`, 'success');
+                console.log(`Group ${groupId} set to ${power}:`, result);
+                
+                addEvent({
+                    action: 'group_set',
+                    group_id: groupId,
+                    power: power,
+                    device_count: publishedCount
+                });
+                
+            } catch (error) {
+                console.error('Failed to set group:', error);
+                showToast(`Fehler: ${error.message}`, 'error');
+            } finally {
+                buttonElement.innerHTML = originalHTML;
+                allButtons.forEach(btn => btn.disabled = false);
+            }
+        }
+        
+        // Load and render scenes
+        async function loadScenes() {
+            try {
+                const response = await fetch(api('/scenes'));
+                if (!response.ok) throw new Error('Failed to load scenes');
+                
+                const scenes = await response.json();
+                const container = document.getElementById('scenes-container');
+                const countSpan = document.getElementById('scenes-count');
+                
+                if (scenes.length === 0) {
+                    container.innerHTML = '<p style="color: #666;">Keine Szenen konfiguriert.</p>';
+                    countSpan.textContent = '';
+                    return;
+                }
+                
+                countSpan.textContent = '';
+                
+                container.innerHTML = scenes.map(scene => `
+                    <button class="scene-button" onclick="runScene('${scene.id}', this)">
+                        ${scene.name}
+                    </button>
+                `).join('');
+                
+                console.log(`Loaded ${scenes.length} scenes`);
+            } catch (error) {
+                console.error('Failed to load scenes:', error);
+                const container = document.getElementById('scenes-container');
+                container.innerHTML = '<p style="color: #999;">Fehler beim Laden der Szenen</p>';
+                showToast('Fehler beim Laden der Szenen', 'error');
+            }
+        }
+        
+        // Execute scene
+        async function runScene(sceneId, buttonElement) {
+            buttonElement.disabled = true;
+            
+            const originalHTML = buttonElement.innerHTML;
+            buttonElement.innerHTML = `${originalHTML} <span class="spinner"></span>`;
+            
+            try {
+                const response = await fetch(api(`/scenes/${sceneId}/run`), {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' }
+                });
+                
+                if (!response.ok) {
+                    const error = await response.json();
+                    throw new Error(error.detail || 'Request failed');
+                }
+                
+                const result = await response.json();
+                const totalPublished = result.steps.reduce((sum, step) => 
+                    sum + step.devices.filter(d => d.status === 'published').length, 0
+                );
+                
+                showToast(`Szene ausgeführt: ${totalPublished} Aktionen`, 'success');
+                console.log(`Scene ${sceneId} executed:`, result);
+                
+                addEvent({
+                    action: 'scene_run',
+                    scene_id: sceneId,
+                    steps: result.steps.length,
+                    total_actions: totalPublished
+                });
+                
+            } catch (error) {
+                console.error('Failed to run scene:', error);
+                showToast(`Fehler: ${error.message}`, 'error');
+            } finally {
+                buttonElement.innerHTML = originalHTML;
+                buttonElement.disabled = false;
+            }
+        }
+        
+        // Load groups and scenes on page load
+        document.addEventListener('DOMContentLoaded', () => {
+            loadGroups();
+            loadScenes();
+        });
     </script>
 </body>
 </html>

config/groups.yaml

@@ -0,0 +1,36 @@
+version: 1
+groups:
+  - id: "kueche_lichter"
+    name: "Küche – alle Lampen"
+    selector:
+      type: "light"
+      room: "Küche"
+    capabilities:
+      power: true
+      brightness: true
+
+  - id: "alles_lichter"
+    name: "Alle Lichter"
+    selector:
+      type: "light"
+    capabilities:
+      power: true
+
+  - id: "schlafzimmer_lichter"
+    name: "Schlafzimmer – alle Lampen"
+    selector:
+      type: "light"
+      room: "Schlafzimmer"
+    capabilities:
+      power: true
+      brightness: true
+
+  - id: "schlafzimmer_schlummer_licht"
+    name: "Schlafzimmer – Schlummerlicht"
+    device_ids:
+      - bettlicht_patty
+      - bettlicht_wolfgang
+      - medusalampe_schlafzimmer
+    capabilities:
+      power: true
+      brightness: true

config/scenes.yaml

@@ -0,0 +1,24 @@
+version: 1
+scenes:
+  - id: "alles_aus"
+    name: "Alles aus"
+    steps:
+      - selector: { type: "light" }
+        action:
+          type: "light"
+          payload: { power: "off" }
+      - selector: { type: "relay" }
+        action:
+          type: "relay"
+          payload: { power: "off" }
+
+  - id: "kueche_gemuetlich"
+    name: "Küche gemütlich"
+    steps:
+      - group_id: "kueche_lichter"
+        action:
+          type: "light"
+          payload:
+            power: "on"
+            brightness: 35
+              

packages/home_capabilities/__init__.py

@@ -10,7 +10,25 @@ from packages.home_capabilities.temp_humidity_sensor import CAP_VERSION as TEMP_
 from packages.home_capabilities.temp_humidity_sensor import TempHumidityState
 from packages.home_capabilities.relay import CAP_VERSION as RELAY_VERSION
 from packages.home_capabilities.relay import RelayState
-from packages.home_capabilities.layout import DeviceTile, Room, UiLayout, load_layout
+from packages.home_capabilities.layout import (
+    DeviceTile,
+    Room,
+    UiLayout,
+    load_layout,
+)
+from packages.home_capabilities.groups_scenes import (
+    GroupConfig,
+    GroupsConfigRoot,
+    GroupSelector,
+    SceneConfig,
+    ScenesConfigRoot,
+    SceneSelector,
+    SceneStep,
+    get_group_by_id,
+    get_scene_by_id,
+    load_groups,
+    load_scenes,
+)
 
 __all__ = [
     "LightState",
@@ -27,4 +45,15 @@ __all__ = [
     "Room",
     "UiLayout",
     "load_layout",
+    "GroupConfig",
+    "GroupsConfigRoot",
+    "GroupSelector",
+    "SceneConfig",
+    "ScenesConfigRoot",
+    "SceneSelector",
+    "SceneStep",
+    "get_group_by_id",
+    "get_scene_by_id",
+    "load_groups",
+    "load_scenes",
 ]

packages/home_capabilities/groups_scenes.py

@@ -0,0 +1,229 @@
+"""
+Configuration models and loaders for groups and scenes.
+
+This module provides Pydantic models for validating groups.yaml and scenes.yaml,
+along with loader functions that parse YAML files into typed configuration objects.
+"""
+
+from pathlib import Path
+from typing import Any
+
+import yaml
+from pydantic import BaseModel, Field, field_validator, model_validator
+
+
+# ============================================================================
+# GROUP MODELS
+# ============================================================================
+
+class GroupSelector(BaseModel):
+    """Selector for automatically adding devices to a group."""
+    type: str = Field(..., description="Device type (e.g., 'light', 'thermostat')")
+    room: str | None = Field(None, description="Filter by room name")
+    tags: list[str] | None = Field(None, description="Filter by device tags")
+
+
+class GroupConfig(BaseModel):
+    """Configuration for a device group."""
+    id: str = Field(..., description="Unique group identifier")
+    name: str = Field(..., description="Human-readable group name")
+    selector: GroupSelector | None = Field(None, description="Auto-select devices by criteria")
+    device_ids: list[str] = Field(default_factory=list, description="Explicit device IDs")
+    capabilities: dict[str, bool] = Field(
+        default_factory=dict,
+        description="Supported capabilities (e.g., {'brightness': True})"
+    )
+
+
+class GroupsConfigRoot(BaseModel):
+    """Root configuration for groups.yaml."""
+    version: int = Field(..., description="Configuration schema version")
+    groups: list[GroupConfig] = Field(default_factory=list, description="List of groups")
+    
+    @field_validator('groups')
+    @classmethod
+    def validate_unique_ids(cls, groups: list[GroupConfig]) -> list[GroupConfig]:
+        """Ensure all group IDs are unique."""
+        ids = [g.id for g in groups]
+        duplicates = [id for id in ids if ids.count(id) > 1]
+        if duplicates:
+            raise ValueError(f"Duplicate group IDs found: {set(duplicates)}")
+        return groups
+
+
+# ============================================================================
+# SCENE MODELS
+# ============================================================================
+
+class SceneSelector(BaseModel):
+    """Selector for targeting devices in a scene step."""
+    type: str | None = Field(None, description="Device type (e.g., 'light', 'outlet')")
+    room: str | None = Field(None, description="Filter by room name")
+    tags: list[str] | None = Field(None, description="Filter by device tags")
+
+
+class SceneStep(BaseModel):
+    """A single step in a scene execution."""
+    selector: SceneSelector | None = Field(None, description="Select devices by criteria")
+    group_id: str | None = Field(None, description="Target a specific group")
+    action: dict[str, Any] = Field(..., description="Action to execute (type + payload)")
+    delay_ms: int | None = Field(None, description="Delay before next step (milliseconds)")
+    
+    @model_validator(mode='after')
+    def validate_selector_or_group(self) -> 'SceneStep':
+        """Ensure either selector OR group_id is specified, but not both."""
+        has_selector = self.selector is not None
+        has_group = self.group_id is not None
+        
+        if not has_selector and not has_group:
+            raise ValueError("SceneStep must have either 'selector' or 'group_id'")
+        
+        if has_selector and has_group:
+            raise ValueError("SceneStep cannot have both 'selector' and 'group_id'")
+        
+        return self
+
+
+class SceneConfig(BaseModel):
+    """Configuration for a scene."""
+    id: str = Field(..., description="Unique scene identifier")
+    name: str = Field(..., description="Human-readable scene name")
+    steps: list[SceneStep] = Field(..., description="Ordered list of actions")
+
+
+class ScenesConfigRoot(BaseModel):
+    """Root configuration for scenes.yaml."""
+    version: int = Field(..., description="Configuration schema version")
+    scenes: list[SceneConfig] = Field(default_factory=list, description="List of scenes")
+    
+    @field_validator('scenes')
+    @classmethod
+    def validate_unique_ids(cls, scenes: list[SceneConfig]) -> list[SceneConfig]:
+        """Ensure all scene IDs are unique."""
+        ids = [s.id for s in scenes]
+        duplicates = [id for id in ids if ids.count(id) > 1]
+        if duplicates:
+            raise ValueError(f"Duplicate scene IDs found: {set(duplicates)}")
+        return scenes
+
+
+# ============================================================================
+# LOADER FUNCTIONS
+# ============================================================================
+
+def load_groups(path: Path | str) -> GroupsConfigRoot:
+    """
+    Load and validate groups configuration from YAML file.
+    
+    Args:
+        path: Path to groups.yaml file
+        
+    Returns:
+        Validated GroupsConfigRoot object
+        
+    Raises:
+        FileNotFoundError: If config file doesn't exist
+        ValidationError: If configuration is invalid
+        ValueError: If duplicate group IDs are found or YAML is empty
+    """
+    path = Path(path)
+    
+    if not path.exists():
+        raise FileNotFoundError(f"Groups config file not found: {path}")
+    
+    with open(path, 'r', encoding='utf-8') as f:
+        data = yaml.safe_load(f)
+    
+    if data is None:
+        raise ValueError(f"Groups config file is empty: {path}")
+    
+    return GroupsConfigRoot.model_validate(data)
+
+
+def load_scenes(path: Path | str) -> ScenesConfigRoot:
+    """
+    Load and validate scenes configuration from YAML file.
+    
+    Args:
+        path: Path to scenes.yaml file
+        
+    Returns:
+        Validated ScenesConfigRoot object
+        
+    Raises:
+        FileNotFoundError: If config file doesn't exist
+        ValidationError: If configuration is invalid
+        ValueError: If duplicate scene IDs, invalid steps, or empty YAML are found
+    """
+    path = Path(path)
+    
+    if not path.exists():
+        raise FileNotFoundError(f"Scenes config file not found: {path}")
+    
+    with open(path, 'r', encoding='utf-8') as f:
+        data = yaml.safe_load(f)
+    
+    if data is None:
+        raise ValueError(f"Scenes config file is empty: {path}")
+    
+    return ScenesConfigRoot.model_validate(data)
+
+
+# ============================================================================
+# CONVENIENCE FUNCTIONS
+# ============================================================================
+
+def get_group_by_id(config: GroupsConfigRoot, group_id: str) -> GroupConfig | None:
+    """Find a group by its ID."""
+    for group in config.groups:
+        if group.id == group_id:
+            return group
+    return None
+
+
+def get_scene_by_id(config: ScenesConfigRoot, scene_id: str) -> SceneConfig | None:
+    """Find a scene by its ID."""
+    for scene in config.scenes:
+        if scene.id == scene_id:
+            return scene
+    return None
+
+
+# ============================================================================
+# EXAMPLE USAGE
+# ============================================================================
+
+if __name__ == "__main__":
+    from pathlib import Path
+    
+    # Example: Load groups configuration
+    try:
+        groups_path = Path(__file__).parent.parent / "config" / "groups.yaml"
+        groups = load_groups(groups_path)
+        print(f"✓ Loaded {len(groups.groups)} groups (version {groups.version})")
+        for group in groups.groups:
+            print(f"  - {group.id}: {group.name}")
+            if group.selector:
+                print(f"    Selector: type={group.selector.type}, room={group.selector.room}")
+            if group.device_ids:
+                print(f"    Devices: {', '.join(group.device_ids)}")
+    except Exception as e:
+        print(f"✗ Error loading groups: {e}")
+    
+    print()
+    
+    # Example: Load scenes configuration
+    try:
+        scenes_path = Path(__file__).parent.parent / "config" / "scenes.yaml"
+        scenes = load_scenes(scenes_path)
+        print(f"✓ Loaded {len(scenes.scenes)} scenes (version {scenes.version})")
+        for scene in scenes.scenes:
+            print(f"  - {scene.id}: {scene.name} ({len(scene.steps)} steps)")
+            for i, step in enumerate(scene.steps, 1):
+                if step.selector:
+                    print(f"    Step {i}: selector type={step.selector.type}")
+                elif step.group_id:
+                    print(f"    Step {i}: group_id={step.group_id}")
+                print(f"      Action: {step.action}")
+    except Exception as e:
+        print(f"✗ Error loading scenes: {e}")