Add software brightness control for Adalight devices

Emulates hardware brightness by multiplying pixel values before serial
send. Stored per-device and persisted across restarts.

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

server/src/wled_controller/core/adalight_provider.py

@@ -22,10 +22,10 @@ class AdalightDeviceProvider(LEDDeviceProvider):
 
     @property
     def capabilities(self) -> set:
-        # No hardware brightness control, no standby required
         # manual_led_count: user must specify LED count (can't auto-detect)
         # power_control: can blank LEDs by sending all-black pixels
-        return {"manual_led_count", "power_control"}
+        # brightness_control: software brightness (multiplies pixel values before sending)
+        return {"manual_led_count", "power_control", "brightness_control"}
 
     def create_client(self, url: str, **kwargs) -> LEDClient:
         from wled_controller.core.adalight_client import AdalightClient

server/src/wled_controller/core/processor_manager.py

@@ -166,6 +166,8 @@ class DeviceState:
     baud_rate: Optional[int] = None
     health: DeviceHealth = field(default_factory=DeviceHealth)
     health_task: Optional[asyncio.Task] = None
+    # Software brightness for devices without hardware brightness (e.g. Adalight)
+    software_brightness: int = 255
     # Calibration test mode (works independently of target processing)
     test_mode_active: bool = False
     test_mode_edges: Dict[str, Tuple[int, int, int]] = field(default_factory=dict)
@@ -281,6 +283,7 @@ class ProcessorManager:
         calibration: Optional[CalibrationConfig] = None,
         device_type: str = "wled",
         baud_rate: Optional[int] = None,
+        software_brightness: int = 255,
     ):
         """Register a device for health monitoring.
 
@@ -291,6 +294,7 @@ class ProcessorManager:
             calibration: Calibration config (creates default if None)
             device_type: LED device type (e.g. "wled")
             baud_rate: Serial baud rate (for adalight devices)
+            software_brightness: Software brightness 0-255 (for devices without hardware brightness)
         """
         if device_id in self._devices:
             raise ValueError(f"Device {device_id} already registered")
@@ -305,6 +309,7 @@ class ProcessorManager:
             calibration=calibration,
             device_type=device_type,
             baud_rate=baud_rate,
+            software_brightness=software_brightness,
         )
 
         self._devices[device_id] = state
@@ -775,6 +780,8 @@ class ProcessorManager:
                             if not state.is_running or state.led_client is None:
                                 break
                             brightness_value = int(led_brightness * 255)
+                            if device_state and device_state.software_brightness < 255:
+                                brightness_value = brightness_value * device_state.software_brightness // 255
                             if state.led_client.supports_fast_send:
                                 state.led_client.send_pixels_fast(state.previous_colors, brightness=brightness_value)
                             else:
@@ -803,6 +810,8 @@ class ProcessorManager:
                     if not state.is_running or state.led_client is None:
                         break
                     brightness_value = int(led_brightness * 255)
+                    if device_state and device_state.software_brightness < 255:
+                        brightness_value = brightness_value * device_state.software_brightness // 255
                     t_send_start = time.perf_counter()
                     if state.led_client.supports_fast_send:
                         state.led_client.send_pixels_fast(led_colors, brightness=brightness_value)