Fix numpy serialization and add comprehensive error logging

Server fixes:
- Fix numpy uint8 JSON serialization by converting to Python int
- Change WLED payload to flat array format [r,g,b,r,g,b,...]
- Add payload debugging logs (size, LED count, sample data)

Web UI improvements:
- Add comprehensive console logging for device errors
- Log actual error messages from state.errors array
- Log device operations (start/stop/add) with details
- Fix password field form validation warning

The HTTP API may have payload size limitations for large LED counts.
Consider UDP protocols (DDP/E1.31) for better real-time performance.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

server/CLAUDE.md

@@ -73,6 +73,10 @@ After restarting the server with new code:
 2. **Restart the server**
 3. Test with `GET /api/v1/config/displays`
 
+### Modifying server login:
+1. Update the logic.
+2. **Restart the server**
+
 ### Adding translations:
 1. Add keys to `static/locales/en.json` and `static/locales/ru.json`
 2. Add `data-i18n` attributes to HTML elements in `static/index.html`

server/src/wled_controller/core/wled_client.py

@@ -234,26 +234,35 @@ class WLEDClient:
         if not 0 <= brightness <= 255:
             raise ValueError(f"Brightness must be 0-255, got {brightness}")
 
-        # Validate pixel values
+        # Validate and convert pixel values to Python ints (handles numpy types)
+        # WLED expects a flat array: [r1, g1, b1, r2, g2, b2, ...]
+        flat_pixels = []
         for i, (r, g, b) in enumerate(pixels):
             if not (0 <= r <= 255 and 0 <= g <= 255 and 0 <= b <= 255):
                 raise ValueError(f"Invalid RGB values at index {i}: ({r}, {g}, {b})")
+            # Convert to Python int and flatten to [r, g, b, r, g, b, ...]
+            flat_pixels.extend([int(r), int(g), int(b)])
 
-        # Build WLED JSON state
+        # Build WLED JSON state with flat pixel array
         payload = {
             "on": True,
-            "bri": brightness,
+            "bri": int(brightness),  # Ensure brightness is also a Python int
             "seg": [
                 {
                     "id": segment_id,
-                    "i": pixels,  # Individual LED colors
+                    "i": flat_pixels,  # Individual LED colors as flat array
                 }
             ],
         }
 
+        # Log payload details for debugging
+        logger.debug(f"Sending {len(pixels)} LEDs ({len(flat_pixels)} values) to WLED")
+        logger.debug(f"Payload size: ~{len(str(payload))} bytes")
+        logger.debug(f"First 3 LEDs: {flat_pixels[:9] if len(flat_pixels) >= 9 else flat_pixels}")
+
         try:
             await self._request("POST", "/json/state", json_data=payload)
-            logger.debug(f"Sent {len(pixels)} pixel colors to WLED device")
+            logger.debug(f"Successfully sent pixel colors to WLED device")
             return True
 
         except Exception as e:

server/src/wled_controller/static/app.js

@@ -392,6 +392,28 @@ async function loadDevices() {
                     });
                     const metrics = await metricsResponse.json();
 
+                    // Log device info, especially if there are errors
+                    if (metrics.errors_count > 0) {
+                        console.warn(`[Device: ${device.name || device.id}] Has ${metrics.errors_count} error(s)`);
+
+                        // Log recent errors from state
+                        if (state.errors && state.errors.length > 0) {
+                            console.error('Recent errors:');
+                            state.errors.forEach((error, index) => {
+                                console.error(`  ${index + 1}. ${error}`);
+                            });
+                        }
+
+                        // Log last error from metrics
+                        if (metrics.last_error) {
+                            console.error('Last error:', metrics.last_error);
+                        }
+
+                        // Log full state and metrics for debugging
+                        console.log('Full state:', state);
+                        console.log('Full metrics:', metrics);
+                    }
+
                     return { ...device, state, metrics };
                 } catch (error) {
                     console.error(`Failed to load state for device ${device.id}:`, error);
@@ -492,6 +514,7 @@ function attachDeviceListeners(deviceId) {
 
 // Device actions
 async function startProcessing(deviceId) {
+    console.log(`[Device: ${deviceId}] Starting processing...`);
     try {
         const response = await fetch(`${API_BASE}/devices/${deviceId}/start`, {
             method: 'POST',
@@ -504,19 +527,22 @@ async function startProcessing(deviceId) {
         }
 
         if (response.ok) {
+            console.log(`[Device: ${deviceId}] Processing started successfully`);
             showToast('Processing started', 'success');
             loadDevices();
         } else {
             const error = await response.json();
+            console.error(`[Device: ${deviceId}] Failed to start:`, error);
             showToast(`Failed to start: ${error.detail}`, 'error');
         }
     } catch (error) {
-        console.error('Failed to start processing:', error);
+        console.error(`[Device: ${deviceId}] Failed to start processing:`, error);
         showToast('Failed to start processing', 'error');
     }
 }
 
 async function stopProcessing(deviceId) {
+    console.log(`[Device: ${deviceId}] Stopping processing...`);
     try {
         const response = await fetch(`${API_BASE}/devices/${deviceId}/stop`, {
             method: 'POST',
@@ -529,14 +555,16 @@ async function stopProcessing(deviceId) {
         }
 
         if (response.ok) {
+            console.log(`[Device: ${deviceId}] Processing stopped successfully`);
             showToast('Processing stopped', 'success');
             loadDevices();
         } else {
             const error = await response.json();
+            console.error(`[Device: ${deviceId}] Failed to stop:`, error);
             showToast(`Failed to stop: ${error.detail}`, 'error');
         }
     } catch (error) {
-        console.error('Failed to stop processing:', error);
+        console.error(`[Device: ${deviceId}] Failed to stop processing:`, error);
         showToast('Failed to stop processing', 'error');
     }
 }
@@ -697,6 +725,8 @@ async function handleAddDevice(event) {
     const url = document.getElementById('device-url').value;
     const led_count = parseInt(document.getElementById('device-led-count').value);
 
+    console.log(`Adding device: ${name} (${url}, ${led_count} LEDs)`);
+
     try {
         const response = await fetch(`${API_BASE}/devices`, {
             method: 'POST',
@@ -710,11 +740,14 @@ async function handleAddDevice(event) {
         }
 
         if (response.ok) {
+            const result = await response.json();
+            console.log('Device added successfully:', result);
             showToast('Device added successfully', 'success');
             event.target.reset();
             loadDevices();
         } else {
             const error = await response.json();
+            console.error('Failed to add device:', error);
             showToast(`Failed to add device: ${error.detail}`, 'error');
         }
     } catch (error) {

server/src/wled_controller/static/index.html

@@ -266,32 +266,34 @@
             <div class="modal-header">
                 <h2 data-i18n="auth.title">🔑 Login to WLED Controller</h2>
             </div>
-            <div class="modal-body">
-                <p class="modal-description" data-i18n="auth.message">
-                    Please enter your API key to authenticate and access the WLED Screen Controller.
-                </p>
-                <div class="form-group">
-                    <label for="api-key-input" data-i18n="auth.label">API Key:</label>
-                    <div class="password-input-wrapper">
-                        <input
-                            type="password"
-                            id="api-key-input"
-                            data-i18n-placeholder="auth.placeholder"
-                            placeholder="Enter your API key..."
-                            autocomplete="off"
-                        >
-                        <button type="button" class="password-toggle" onclick="togglePasswordVisibility()">
-                            👁️
-                        </button>
+            <form id="api-key-form" onsubmit="submitApiKey(event)">
+                <div class="modal-body">
+                    <p class="modal-description" data-i18n="auth.message">
+                        Please enter your API key to authenticate and access the WLED Screen Controller.
+                    </p>
+                    <div class="form-group">
+                        <label for="api-key-input" data-i18n="auth.label">API Key:</label>
+                        <div class="password-input-wrapper">
+                            <input
+                                type="password"
+                                id="api-key-input"
+                                data-i18n-placeholder="auth.placeholder"
+                                placeholder="Enter your API key..."
+                                autocomplete="off"
+                            >
+                            <button type="button" class="password-toggle" onclick="togglePasswordVisibility()">
+                                👁️
+                            </button>
+                        </div>
+                        <small class="input-hint" data-i18n="auth.hint">Your API key will be stored securely in your browser's local storage.</small>
                     </div>
-                    <small class="input-hint" data-i18n="auth.hint">Your API key will be stored securely in your browser's local storage.</small>
+                    <div id="api-key-error" class="error-message" style="display: none;"></div>
                 </div>
-                <div id="api-key-error" class="error-message" style="display: none;"></div>
-            </div>
-            <div class="modal-footer">
-                <button class="btn btn-secondary" onclick="closeApiKeyModal()" id="modal-cancel-btn" data-i18n="auth.button.cancel">Cancel</button>
-                <button class="btn btn-primary" onclick="submitApiKey()" data-i18n="auth.button.login">Login</button>
-            </div>
+                <div class="modal-footer">
+                    <button type="button" class="btn btn-secondary" onclick="closeApiKeyModal()" id="modal-cancel-btn" data-i18n="auth.button.cancel">Cancel</button>
+                    <button type="submit" class="btn btn-primary" data-i18n="auth.button.login">Login</button>
+                </div>
+            </form>
         </div>
     </div>
 
@@ -425,7 +427,11 @@
             document.body.classList.remove('modal-open');
         }
 
-        function submitApiKey() {
+        function submitApiKey(event) {
+            if (event) {
+                event.preventDefault();
+            }
+
             const input = document.getElementById('api-key-input');
             const error = document.getElementById('api-key-error');
             const key = input.value.trim();
@@ -454,15 +460,6 @@
                 startAutoRefresh();
             }
         }
-
-        // Handle Enter key in modal
-        document.addEventListener('DOMContentLoaded', () => {
-            document.getElementById('api-key-input').addEventListener('keypress', (e) => {
-                if (e.key === 'Enter') {
-                    submitApiKey();
-                }
-            });
-        });
     </script>
 </body>
 </html>