Add LEDDeviceProvider abstraction and standby capability flag

Consolidate all device-type-specific logic into LEDDeviceProvider ABC
with provider registry. WLEDDeviceProvider handles client creation,
health checks, validation, mDNS discovery, and brightness control.
Routes now delegate to providers instead of using if/else type checks.

Add standby_required capability and expose device capabilities in API.
Target editor conditionally shows standby interval based on selected
device's capabilities.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/api/routes/devices.py

@@ -4,7 +4,11 @@ import httpx
 from fastapi import APIRouter, HTTPException, Depends
 
 from wled_controller.api.auth import AuthRequired
-from wled_controller.core.led_client import get_device_capabilities
+from wled_controller.core.led_client import (
+    get_all_providers,
+    get_device_capabilities,
+    get_provider,
+)
 from wled_controller.api.dependencies import (
     get_device_store,
     get_picture_target_store,
@@ -45,6 +49,7 @@ def _device_to_response(device) -> DeviceResponse:
         device_type=device.device_type,
         led_count=device.led_count,
         enabled=device.enabled,
+        capabilities=sorted(get_device_capabilities(device.device_type)),
         calibration=CalibrationSchema(**calibration_to_dict(device.calibration)),
         created_at=device.created_at,
         updated_at=device.updated_at,
@@ -66,53 +71,44 @@ async def create_device(
         logger.info(f"Creating {device_type} device: {device_data.name}")
 
         device_url = device_data.url.rstrip("/")
-        wled_led_count = 0
 
-        if device_type == "wled":
-            # Validate WLED device is reachable before adding
+        # Validate via provider
         try:
-                async with httpx.AsyncClient(timeout=5) as client:
-                    response = await client.get(f"{device_url}/json/info")
-                    response.raise_for_status()
-                    wled_info = response.json()
-                    wled_led_count = wled_info.get("leds", {}).get("count")
-                    if not wled_led_count or wled_led_count < 1:
+            provider = get_provider(device_type)
+        except ValueError:
             raise HTTPException(
-                            status_code=422,
-                            detail=f"WLED device at {device_url} reported invalid LED count: {wled_led_count}"
-                        )
-                    logger.info(
-                        f"WLED device reachable: {wled_info.get('name', 'Unknown')} "
-                        f"v{wled_info.get('ver', '?')} ({wled_led_count} LEDs)"
+                status_code=400,
+                detail=f"Unsupported device type: {device_type}"
             )
+
+        try:
+            result = await provider.validate_device(device_url)
+            led_count = result["led_count"]
         except httpx.ConnectError:
             raise HTTPException(
                 status_code=422,
-                    detail=f"Cannot reach WLED device at {device_url}. Check the URL and ensure the device is powered on."
+                detail=f"Cannot reach {device_type} device at {device_url}. Check the URL and ensure the device is powered on."
             )
         except httpx.TimeoutException:
             raise HTTPException(
                 status_code=422,
                 detail=f"Connection to {device_url} timed out. Check network connectivity."
             )
+        except ValueError as e:
+            raise HTTPException(status_code=422, detail=str(e))
         except HTTPException:
             raise
         except Exception as e:
             raise HTTPException(
                 status_code=422,
-                    detail=f"Failed to connect to WLED device at {device_url}: {e}"
-                )
-        else:
-            raise HTTPException(
-                status_code=400,
-                detail=f"Unsupported device type: {device_type}"
+                detail=f"Failed to connect to {device_type} device at {device_url}: {e}"
             )
 
         # Create device in storage
         device = store.create_device(
             name=device_data.name,
             url=device_data.url,
-            led_count=wled_led_count,
+            led_count=led_count,
             device_type=device_type,
         )
 
@@ -151,12 +147,17 @@ async def discover_devices(
     store: DeviceStore = Depends(get_device_store),
     timeout: float = 3.0,
 ):
-    """Scan the local network for WLED devices via mDNS."""
+    """Scan the local network for LED devices via all registered providers."""
+    import asyncio
     import time
-    from wled_controller.core.discovery import discover_wled_devices
 
     start = time.time()
-    discovered = await discover_wled_devices(timeout=min(timeout, 10.0))
+    capped_timeout = min(timeout, 10.0)
+    # Discover from all providers in parallel
+    providers = get_all_providers()
+    discover_tasks = [p.discover(timeout=capped_timeout) for p in providers.values()]
+    all_results = await asyncio.gather(*discover_tasks)
+    discovered = [d for batch in all_results for d in batch]
     elapsed_ms = (time.time() - start) * 1000
 
     existing_urls = {d.url.rstrip("/").lower() for d in store.get_all_devices()}
@@ -310,15 +311,12 @@ async def get_device_brightness(
         raise HTTPException(status_code=400, detail=f"Brightness control is not supported for {device.device_type} devices")
 
     try:
-        async with httpx.AsyncClient(timeout=5.0) as http_client:
-            resp = await http_client.get(f"{device.url}/json/state")
-            resp.raise_for_status()
-            state = resp.json()
-            bri = state.get("bri", 255)
+        provider = get_provider(device.device_type)
+        bri = await provider.get_brightness(device.url)
         return {"brightness": bri}
     except Exception as e:
-        logger.error(f"Failed to get WLED brightness for {device_id}: {e}")
-        raise HTTPException(status_code=502, detail=f"Failed to reach WLED device: {e}")
+        logger.error(f"Failed to get brightness for {device_id}: {e}")
+        raise HTTPException(status_code=502, detail=f"Failed to reach device: {e}")
 
 
 @router.put("/api/v1/devices/{device_id}/brightness", tags=["Settings"])
@@ -340,16 +338,12 @@ async def set_device_brightness(
         raise HTTPException(status_code=400, detail="brightness must be an integer 0-255")
 
     try:
-        async with httpx.AsyncClient(timeout=5.0) as http_client:
-            resp = await http_client.post(
-                f"{device.url}/json/state",
-                json={"bri": bri},
-            )
-            resp.raise_for_status()
+        provider = get_provider(device.device_type)
+        await provider.set_brightness(device.url, bri)
         return {"brightness": bri}
     except Exception as e:
-        logger.error(f"Failed to set WLED brightness for {device_id}: {e}")
-        raise HTTPException(status_code=502, detail=f"Failed to reach WLED device: {e}")
+        logger.error(f"Failed to set brightness for {device_id}: {e}")
+        raise HTTPException(status_code=502, detail=f"Failed to reach device: {e}")
 
 
 # ===== CALIBRATION ENDPOINTS =====

server/src/wled_controller/api/schemas/devices.py

@@ -85,6 +85,7 @@ class DeviceResponse(BaseModel):
     device_type: str = Field(default="wled", description="LED device type")
     led_count: int = Field(description="Total number of LEDs")
     enabled: bool = Field(description="Whether device is enabled")
+    capabilities: List[str] = Field(default_factory=list, description="Device type capabilities")
     calibration: Optional[Calibration] = Field(None, description="Calibration configuration")
     created_at: datetime = Field(description="Creation timestamp")
     updated_at: datetime = Field(description="Last update timestamp")

server/src/wled_controller/core/discovery.py

@@ -1,113 +0,0 @@
-"""Network discovery for LED devices (mDNS/DNS-SD)."""
-
-import asyncio
-from dataclasses import dataclass
-from typing import List, Optional
-
-import httpx
-from zeroconf import ServiceStateChange, Zeroconf
-from zeroconf.asyncio import AsyncServiceBrowser, AsyncServiceInfo, AsyncZeroconf
-
-from wled_controller.utils import get_logger
-
-logger = get_logger(__name__)
-
-WLED_MDNS_TYPE = "_wled._tcp.local."
-DEFAULT_SCAN_TIMEOUT = 3.0
-
-
-@dataclass
-class DiscoveredDevice:
-    """A device found via network discovery."""
-
-    name: str
-    url: str
-    device_type: str
-    ip: str
-    mac: str
-    led_count: Optional[int]
-    version: Optional[str]
-
-
-async def _enrich_wled_device(
-    url: str, fallback_name: str
-) -> tuple[str, Optional[str], Optional[int], str]:
-    """Probe a WLED device's /json/info to get name, version, LED count, MAC."""
-    try:
-        async with httpx.AsyncClient(timeout=2) as client:
-            resp = await client.get(f"{url}/json/info")
-            resp.raise_for_status()
-            data = resp.json()
-            return (
-                data.get("name", fallback_name),
-                data.get("ver"),
-                data.get("leds", {}).get("count"),
-                data.get("mac", ""),
-            )
-    except Exception as e:
-        logger.debug(f"Could not fetch WLED info from {url}: {e}")
-        return fallback_name, None, None, ""
-
-
-async def discover_wled_devices(
-    timeout: float = DEFAULT_SCAN_TIMEOUT,
-) -> List[DiscoveredDevice]:
-    """Scan the local network for WLED devices via mDNS."""
-    discovered: dict[str, AsyncServiceInfo] = {}
-
-    def on_state_change(**kwargs):
-        service_type = kwargs.get("service_type", "")
-        name = kwargs.get("name", "")
-        state_change = kwargs.get("state_change")
-        if state_change in (ServiceStateChange.Added, ServiceStateChange.Updated):
-            discovered[name] = AsyncServiceInfo(service_type, name)
-
-    aiozc = AsyncZeroconf()
-    browser = AsyncServiceBrowser(
-        aiozc.zeroconf, WLED_MDNS_TYPE, handlers=[on_state_change]
-    )
-
-    await asyncio.sleep(timeout)
-
-    # Resolve all discovered services
-    for info in discovered.values():
-        await info.async_request(aiozc.zeroconf, timeout=2000)
-
-    await browser.async_cancel()
-
-    # Build raw list with IPs, then enrich in parallel
-    raw: list[tuple[str, str, str]] = []  # (service_name, ip, url)
-    for name, info in discovered.items():
-        addrs = info.parsed_addresses()
-        if not addrs:
-            continue
-        ip = addrs[0]
-        port = info.port or 80
-        url = f"http://{ip}" if port == 80 else f"http://{ip}:{port}"
-        service_name = name.replace(f".{WLED_MDNS_TYPE}", "")
-        raw.append((service_name, ip, url))
-
-    # Enrich all devices in parallel
-    enrichment = await asyncio.gather(
-        *[_enrich_wled_device(url, sname) for sname, _, url in raw]
-    )
-
-    results: List[DiscoveredDevice] = []
-    for (service_name, ip, url), (wled_name, version, led_count, mac) in zip(
-        raw, enrichment
-    ):
-        results.append(
-            DiscoveredDevice(
-                name=wled_name,
-                url=url,
-                device_type="wled",
-                ip=ip,
-                mac=mac,
-                led_count=led_count,
-                version=version,
-            )
-        )
-
-    await aiozc.async_close()
-    logger.info(f"mDNS scan found {len(results)} WLED device(s)")
-    return results

server/src/wled_controller/core/led_client.py

@@ -1,4 +1,4 @@
-"""Abstract base class for LED device communication clients."""
+"""Abstract base class for LED device communication clients and provider registry."""
 
 from abc import ABC, abstractmethod
 from dataclasses import dataclass, field
@@ -22,6 +22,19 @@ class DeviceHealth:
     error: Optional[str] = None
 
 
+@dataclass
+class DiscoveredDevice:
+    """A device found via network discovery."""
+
+    name: str
+    url: str
+    device_type: str
+    ip: str
+    mac: str
+    led_count: Optional[int]
+    version: Optional[str]
+
+
 class LEDClient(ABC):
     """Abstract base for LED device communication.
 
@@ -128,36 +141,97 @@ class LEDClient(ABC):
         await self.close()
 
 
-# Per-device-type capability sets.
-# Used by API routes to gate type-specific features (e.g. brightness control).
-DEVICE_TYPE_CAPABILITIES = {
-    "wled": {"brightness_control"},
-}
+# ===== LED DEVICE PROVIDER =====
 
+class LEDDeviceProvider(ABC):
+    """Encapsulates everything about a specific LED device type.
 
-def get_device_capabilities(device_type: str) -> set:
-    """Return the capability set for a device type."""
-    return DEVICE_TYPE_CAPABILITIES.get(device_type, set())
+    Implement one subclass per device type (WLED, etc.) and register it
+    via register_provider(). All type-specific dispatch (client creation,
+    health checks, discovery, validation, brightness) goes through the provider.
+    """
 
+    @property
+    @abstractmethod
+    def device_type(self) -> str:
+        """Type identifier string, e.g. 'wled'."""
+        ...
 
-def create_led_client(device_type: str, url: str, **kwargs) -> LEDClient:
-    """Factory: create the right LEDClient subclass for a device type.
+    @property
+    def capabilities(self) -> set:
+        """Capability set for this device type. Override to add capabilities."""
+        return set()
 
-    Args:
-        device_type: Device type identifier (e.g. "wled")
-        url: Device URL
-        **kwargs: Passed to the client constructor
+    @abstractmethod
+    def create_client(self, url: str, **kwargs) -> LEDClient:
+        """Create a connected-ready LEDClient for this device type."""
+        ...
+
+    @abstractmethod
+    async def check_health(self, url: str, http_client, prev_health=None) -> DeviceHealth:
+        """Check device health without a full client connection."""
+        ...
+
+    @abstractmethod
+    async def validate_device(self, url: str) -> dict:
+        """Validate a device URL before adding it.
 
         Returns:
-        LEDClient instance
+            dict with at least {'led_count': int}
 
         Raises:
-        ValueError: If device_type is unknown
+            Exception on validation failure (caller converts to HTTP error).
         """
-    if device_type == "wled":
-        from wled_controller.core.wled_client import WLEDClient
-        return WLEDClient(url, **kwargs)
+        ...
+
+    async def discover(self, timeout: float = 3.0) -> List[DiscoveredDevice]:
+        """Discover devices on the network.
+
+        Override in providers that support discovery. Default: empty list.
+        """
+        return []
+
+    async def get_brightness(self, url: str) -> int:
+        """Get device brightness (0-255). Override if capabilities include brightness_control."""
+        raise NotImplementedError
+
+    async def set_brightness(self, url: str, brightness: int) -> None:
+        """Set device brightness (0-255). Override if capabilities include brightness_control."""
+        raise NotImplementedError
+
+
+# ===== PROVIDER REGISTRY =====
+
+_provider_registry: Dict[str, LEDDeviceProvider] = {}
+
+
+def register_provider(provider: LEDDeviceProvider) -> None:
+    """Register a device provider."""
+    _provider_registry[provider.device_type] = provider
+
+
+def get_provider(device_type: str) -> LEDDeviceProvider:
+    """Get the provider for a device type.
+
+    Raises:
+        ValueError: If device_type is unknown.
+    """
+    provider = _provider_registry.get(device_type)
+    if not provider:
         raise ValueError(f"Unknown LED device type: {device_type}")
+    return provider
+
+
+def get_all_providers() -> Dict[str, LEDDeviceProvider]:
+    """Return all registered providers."""
+    return dict(_provider_registry)
+
+
+# ===== FACTORY FUNCTIONS (delegate to providers) =====
+
+def create_led_client(device_type: str, url: str, **kwargs) -> LEDClient:
+    """Factory: create the right LEDClient subclass for a device type."""
+    return get_provider(device_type).create_client(url, **kwargs)
 
 
 async def check_device_health(
@@ -166,15 +240,23 @@ async def check_device_health(
     http_client,
     prev_health: Optional[DeviceHealth] = None,
 ) -> DeviceHealth:
-    """Factory: dispatch health check to the right LEDClient subclass.
+    """Factory: dispatch health check to the right provider."""
+    return await get_provider(device_type).check_health(url, http_client, prev_health)
 
-    Args:
-        device_type: Device type identifier
-        url: Device URL
-        http_client: Shared httpx.AsyncClient
-        prev_health: Previous health result
-    """
-    if device_type == "wled":
-        from wled_controller.core.wled_client import WLEDClient
-        return await WLEDClient.check_health(url, http_client, prev_health)
-    return DeviceHealth(online=True, last_checked=datetime.utcnow())
+
+def get_device_capabilities(device_type: str) -> set:
+    """Return the capability set for a device type."""
+    try:
+        return get_provider(device_type).capabilities
+    except ValueError:
+        return set()
+
+
+# ===== AUTO-REGISTER BUILT-IN PROVIDERS =====
+
+def _register_builtin_providers():
+    from wled_controller.core.wled_provider import WLEDDeviceProvider
+    register_provider(WLEDDeviceProvider())
+
+
+_register_builtin_providers()

server/src/wled_controller/core/wled_provider.py

@@ -0,0 +1,170 @@
+"""WLED device provider — consolidates all WLED-specific dispatch logic."""
+
+import asyncio
+from typing import List, Optional
+
+import httpx
+from zeroconf import ServiceStateChange
+from zeroconf.asyncio import AsyncServiceBrowser, AsyncServiceInfo, AsyncZeroconf
+
+from wled_controller.core.led_client import (
+    DeviceHealth,
+    DiscoveredDevice,
+    LEDClient,
+    LEDDeviceProvider,
+)
+from wled_controller.utils import get_logger
+
+logger = get_logger(__name__)
+
+WLED_MDNS_TYPE = "_wled._tcp.local."
+DEFAULT_SCAN_TIMEOUT = 3.0
+
+
+class WLEDDeviceProvider(LEDDeviceProvider):
+    """Provider for WLED LED controllers."""
+
+    @property
+    def device_type(self) -> str:
+        return "wled"
+
+    @property
+    def capabilities(self) -> set:
+        return {"brightness_control", "standby_required"}
+
+    def create_client(self, url: str, **kwargs) -> LEDClient:
+        from wled_controller.core.wled_client import WLEDClient
+        return WLEDClient(url, **kwargs)
+
+    async def check_health(self, url: str, http_client, prev_health=None) -> DeviceHealth:
+        from wled_controller.core.wled_client import WLEDClient
+        return await WLEDClient.check_health(url, http_client, prev_health)
+
+    async def validate_device(self, url: str) -> dict:
+        """Validate a WLED device URL by probing /json/info.
+
+        Returns:
+            dict with 'led_count' key.
+
+        Raises:
+            httpx.ConnectError: Device unreachable.
+            httpx.TimeoutException: Connection timed out.
+            ValueError: Invalid LED count.
+        """
+        url = url.rstrip("/")
+        async with httpx.AsyncClient(timeout=5) as client:
+            response = await client.get(f"{url}/json/info")
+            response.raise_for_status()
+            wled_info = response.json()
+            led_count = wled_info.get("leds", {}).get("count")
+            if not led_count or led_count < 1:
+                raise ValueError(
+                    f"WLED device at {url} reported invalid LED count: {led_count}"
+                )
+            logger.info(
+                f"WLED device reachable: {wled_info.get('name', 'Unknown')} "
+                f"v{wled_info.get('ver', '?')} ({led_count} LEDs)"
+            )
+            return {"led_count": led_count}
+
+    # ===== DISCOVERY =====
+
+    async def discover(self, timeout: float = DEFAULT_SCAN_TIMEOUT) -> List[DiscoveredDevice]:
+        """Scan the local network for WLED devices via mDNS."""
+        discovered: dict[str, AsyncServiceInfo] = {}
+
+        def on_state_change(**kwargs):
+            service_type = kwargs.get("service_type", "")
+            name = kwargs.get("name", "")
+            state_change = kwargs.get("state_change")
+            if state_change in (ServiceStateChange.Added, ServiceStateChange.Updated):
+                discovered[name] = AsyncServiceInfo(service_type, name)
+
+        aiozc = AsyncZeroconf()
+        browser = AsyncServiceBrowser(
+            aiozc.zeroconf, WLED_MDNS_TYPE, handlers=[on_state_change]
+        )
+
+        await asyncio.sleep(timeout)
+
+        # Resolve all discovered services
+        for info in discovered.values():
+            await info.async_request(aiozc.zeroconf, timeout=2000)
+
+        await browser.async_cancel()
+
+        # Build raw list with IPs, then enrich in parallel
+        raw: list[tuple[str, str, str]] = []  # (service_name, ip, url)
+        for name, info in discovered.items():
+            addrs = info.parsed_addresses()
+            if not addrs:
+                continue
+            ip = addrs[0]
+            port = info.port or 80
+            url = f"http://{ip}" if port == 80 else f"http://{ip}:{port}"
+            service_name = name.replace(f".{WLED_MDNS_TYPE}", "")
+            raw.append((service_name, ip, url))
+
+        # Enrich all devices in parallel
+        enrichment = await asyncio.gather(
+            *[self._enrich_device(url, sname) for sname, _, url in raw]
+        )
+
+        results: List[DiscoveredDevice] = []
+        for (service_name, ip, url), (wled_name, version, led_count, mac) in zip(
+            raw, enrichment
+        ):
+            results.append(
+                DiscoveredDevice(
+                    name=wled_name,
+                    url=url,
+                    device_type="wled",
+                    ip=ip,
+                    mac=mac,
+                    led_count=led_count,
+                    version=version,
+                )
+            )
+
+        await aiozc.async_close()
+        logger.info(f"mDNS scan found {len(results)} WLED device(s)")
+        return results
+
+    @staticmethod
+    async def _enrich_device(
+        url: str, fallback_name: str
+    ) -> tuple[str, Optional[str], Optional[int], str]:
+        """Probe a WLED device's /json/info to get name, version, LED count, MAC."""
+        try:
+            async with httpx.AsyncClient(timeout=2) as client:
+                resp = await client.get(f"{url}/json/info")
+                resp.raise_for_status()
+                data = resp.json()
+                return (
+                    data.get("name", fallback_name),
+                    data.get("ver"),
+                    data.get("leds", {}).get("count"),
+                    data.get("mac", ""),
+                )
+        except Exception as e:
+            logger.debug(f"Could not fetch WLED info from {url}: {e}")
+            return fallback_name, None, None, ""
+
+    # ===== BRIGHTNESS =====
+
+    async def get_brightness(self, url: str) -> int:
+        url = url.rstrip("/")
+        async with httpx.AsyncClient(timeout=5.0) as http_client:
+            resp = await http_client.get(f"{url}/json/state")
+            resp.raise_for_status()
+            state = resp.json()
+            return state.get("bri", 255)
+
+    async def set_brightness(self, url: str, brightness: int) -> None:
+        url = url.rstrip("/")
+        async with httpx.AsyncClient(timeout=5.0) as http_client:
+            resp = await http_client.post(
+                f"{url}/json/state",
+                json={"bri": brightness},
+            )
+            resp.raise_for_status()

server/src/wled_controller/static/app.js

@@ -873,6 +873,8 @@ async function fetchDeviceBrightness(deviceId) {
 }
 
 // Add device modal
+let _discoveryScanRunning = false;
+
 function showAddDevice() {
     const modal = document.getElementById('add-device-modal');
     const form = document.getElementById('add-device-form');
@@ -892,6 +894,8 @@ function showAddDevice() {
     modal.style.display = 'flex';
     lockBody();
     setTimeout(() => document.getElementById('device-name').focus(), 100);
+    // Auto-start discovery on open
+    scanForDevices();
 }
 
 function closeAddDeviceModal() {
@@ -901,6 +905,9 @@ function closeAddDeviceModal() {
 }
 
 async function scanForDevices() {
+    if (_discoveryScanRunning) return;
+    _discoveryScanRunning = true;
+
     const loading = document.getElementById('discovery-loading');
     const list = document.getElementById('discovery-list');
     const empty = document.getElementById('discovery-empty');
@@ -962,6 +969,8 @@ async function scanForDevices() {
         empty.style.display = 'block';
         empty.querySelector('small').textContent = t('device.scan.error');
         console.error('Device scan failed:', err);
+    } finally {
+        _discoveryScanRunning = false;
     }
 }
 
@@ -3906,6 +3915,15 @@ function closePPTemplateModal() {
 
 // ===== TARGET EDITOR MODAL =====
 let targetEditorInitialValues = {};
+let _targetEditorDevices = [];  // cached devices list for capability checks
+
+function _updateStandbyVisibility() {
+    const deviceSelect = document.getElementById('target-editor-device');
+    const standbyGroup = document.getElementById('target-editor-standby-group');
+    const selectedDevice = _targetEditorDevices.find(d => d.id === deviceSelect.value);
+    const caps = selectedDevice?.capabilities || [];
+    standbyGroup.style.display = caps.includes('standby_required') ? '' : 'none';
+}
 
 async function showTargetEditor(targetId = null) {
     try {
@@ -3917,6 +3935,7 @@ async function showTargetEditor(targetId = null) {
 
         const devices = devicesResp.ok ? (await devicesResp.json()).devices || [] : [];
         const sources = sourcesResp.ok ? (await sourcesResp.json()).streams || [] : [];
+        _targetEditorDevices = devices;
 
         // Populate device select
         const deviceSelect = document.getElementById('target-editor-device');
@@ -3929,6 +3948,7 @@ async function showTargetEditor(targetId = null) {
             opt.textContent = `${d.name} [${devType}]${shortUrl ? ' (' + shortUrl + ')' : ''}`;
             deviceSelect.appendChild(opt);
         });
+        deviceSelect.onchange = _updateStandbyVisibility;
 
         // Populate source select
         const sourceSelect = document.getElementById('target-editor-source');
@@ -3975,6 +3995,9 @@ async function showTargetEditor(targetId = null) {
             document.getElementById('target-editor-title').textContent = t('targets.add');
         }
 
+        // Show/hide standby interval based on selected device capabilities
+        _updateStandbyVisibility();
+
         targetEditorInitialValues = {
             name: document.getElementById('target-editor-name').value,
             device: deviceSelect.value,

server/src/wled_controller/static/index.html

@@ -336,7 +336,7 @@
                         <input type="range" id="target-editor-smoothing" min="0.0" max="1.0" step="0.05" value="0.3" oninput="document.getElementById('target-editor-smoothing-value').textContent = this.value">
                     </div>
 
-                    <div class="form-group">
+                    <div class="form-group" id="target-editor-standby-group">
                         <div class="label-row">
                             <label for="target-editor-standby-interval">
                                 <span data-i18n="targets.standby_interval">Standby Interval:</span>