optimize AP mode

- save wifi data
- show status led

Signed-off-by: Peter Siegmund <developer@mars3142.org>

firmware/components/api-server/CMakeLists.txt

@@ -12,4 +12,5 @@ idf_component_register(SRCS
             esp_event
             json
             simulator
+            persistence-manager
 )

firmware/components/api-server/src/api_handlers.c

@@ -5,6 +5,7 @@
 #include <esp_http_server.h>
 #include <esp_log.h>
 #include <esp_wifi.h>
+#include <persistence_manager.h>
 #include <string.h>
 #include <sys/stat.h>
 
@@ -116,6 +117,17 @@ esp_err_t api_wifi_scan_handler(httpd_req_t *req)
     return res;
 }
 
+static void reboot_task(void *param)
+{
+    vTaskDelay(pdMS_TO_TICKS(100));
+    esp_restart();
+}
+
+static bool is_valid(const cJSON *string)
+{
+    return string && cJSON_IsString(string) && string->valuestring && strlen(string->valuestring) > 0;
+}
+
 esp_err_t api_wifi_config_handler(httpd_req_t *req)
 {
     ESP_LOGI(TAG, "POST /api/wifi/config");
@@ -128,12 +140,22 @@ esp_err_t api_wifi_config_handler(httpd_req_t *req)
     }
     buf[ret] = '\0';
 
-    // Passwort maskieren
     cJSON *json = cJSON_Parse(buf);
     if (json)
     {
+        cJSON *ssid = cJSON_GetObjectItem(json, "ssid");
         cJSON *pw = cJSON_GetObjectItem(json, "password");
-        if (pw && cJSON_IsString(pw) && pw->valuestring)
+        if (is_valid(ssid) && is_valid(pw))
+        {
+            persistence_manager_t pm;
+            if (persistence_manager_init(&pm, "wifi_config") == ESP_OK)
+            {
+                persistence_manager_set_string(&pm, "ssid", ssid->valuestring);
+                persistence_manager_set_string(&pm, "password", pw->valuestring);
+                persistence_manager_deinit(&pm);
+            }
+        }
+        if (is_valid(pw))
         {
             size_t pwlen = strlen(pw->valuestring);
             char *masked = malloc(pwlen + 1);
@@ -163,7 +185,9 @@ esp_err_t api_wifi_config_handler(httpd_req_t *req)
         ESP_LOGI(TAG, "Received WiFi config: %s", buf);
     }
 
-    // TODO: Parse JSON and connect to WiFi
+    // Define a reboot task function
+    xTaskCreate(reboot_task, "reboot_task", 2048, NULL, 5, NULL);
+
     set_cors_headers(req);
     httpd_resp_set_status(req, "200 OK");
     return httpd_resp_sendstr(req, "{\"status\":\"ok\"}");

firmware/components/api-server/src/websocket_handler.c

@@ -18,7 +18,7 @@ static void ws_clients_init(void)
 }
 
 // Add a client to the list
-static void add_client(int fd)
+static bool add_client(int fd)
 {
     for (int i = 0; i < WS_MAX_CLIENTS; i++)
     {
@@ -27,10 +27,11 @@ static void add_client(int fd)
             ws_clients[i] = fd;
             ws_client_count++;
             ESP_LOGI(TAG, "WebSocket client connected: fd=%d (total: %d)", fd, ws_client_count);
-            return;
+            return true;
         }
     }
     ESP_LOGW(TAG, "Max WebSocket clients reached, cannot add fd=%d", fd);
+    return false;
 }
 
 // Remove a client from the list
@@ -83,6 +84,13 @@ esp_err_t websocket_handler(httpd_req_t *req)
     {
         // This is the handshake
         ESP_LOGI(TAG, "WebSocket handshake");
+        int fd = httpd_req_to_sockfd(req);
+        if (!add_client(fd))
+        {
+            // Zu viele Clients, Verbindung schließen
+            httpd_sess_trigger_close(req->handle, fd);
+            return ESP_FAIL;
+        }
         return ESP_OK;
     }
 

firmware/components/connectivity-manager/src/dns_hijack.c

@@ -51,7 +51,6 @@ static void dns_server_task(void *pvParameters)
         // Fragen: 1, Antworten: 1
         buf[7] = 1;
         // Antwort anhängen (Name Pointer auf Frage)
-        int qlen = len - 12;
         int pos = len;
         buf[pos++] = 0xC0;
         buf[pos++] = 0x0C; // Name pointer

firmware/components/connectivity-manager/src/wifi_manager.c

@@ -16,204 +16,120 @@
 #include <lwip/sys.h>
 #include <mdns.h>
 #include <nvs_flash.h>
+#include <persistence_manager.h>
 #include <sdkconfig.h>
 #include <string.h>
 
-// Event group to signal when we are connected
+// Event group to signal WiFi connection status
 static EventGroupHandle_t s_wifi_event_group;
 
-// The bits for the event group
+// Event group bits
 #define WIFI_CONNECTED_BIT BIT0
 #define WIFI_FAIL_BIT BIT1
 
 static const char *TAG = "wifi_manager";
 
-static int s_retry_num = 0;
-static int s_current_network_index = 0;
-
-// WiFi network configuration structure
-typedef struct
+static void wifi_create_ap()
 {
-    const char *ssid;
-    const char *password;
-} wifi_network_config_t;
-
-// Array of configured WiFi networks
-static const wifi_network_config_t s_wifi_networks[] = {
-#if CONFIG_WIFI_ENABLED
-    {CONFIG_WIFI_SSID_1, CONFIG_WIFI_PASSWORD_1},
-#if CONFIG_WIFI_NETWORK_COUNT >= 2
-    {CONFIG_WIFI_SSID_2, CONFIG_WIFI_PASSWORD_2},
-#endif
-#if CONFIG_WIFI_NETWORK_COUNT >= 3
-    {CONFIG_WIFI_SSID_3, CONFIG_WIFI_PASSWORD_3},
-#endif
-#if CONFIG_WIFI_NETWORK_COUNT >= 4
-    {CONFIG_WIFI_SSID_4, CONFIG_WIFI_PASSWORD_4},
-#endif
-#if CONFIG_WIFI_NETWORK_COUNT >= 5
-    {CONFIG_WIFI_SSID_5, CONFIG_WIFI_PASSWORD_5},
-#endif
-#endif
-};
-
-static const int s_wifi_network_count = sizeof(s_wifi_networks) / sizeof(s_wifi_networks[0]);
-
-static void try_next_network(void);
-
-static void connect_to_network(int index)
-{
-#if CONFIG_WIFI_ENABLED
-    if (index >= s_wifi_network_count)
-    {
-        ESP_LOGE(TAG, "No more networks to try");
-        xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
-        return;
-    }
-
-    const wifi_network_config_t *network = &s_wifi_networks[index];
-
-    // Skip empty SSIDs
-    if (network->ssid == NULL || strlen(network->ssid) == 0)
-    {
-        ESP_LOGW(TAG, "Skipping empty SSID at index %d", index);
-        s_current_network_index++;
-        s_retry_num = 0;
-        try_next_network();
-        return;
-    }
-
-    ESP_DIAG_EVENT(TAG, "Trying to connect to network %d: %s", index + 1, network->ssid);
-
-    wifi_config_t wifi_config = {
-        .sta =
-            {
-                .threshold.authmode = WIFI_AUTH_WPA2_PSK,
-            },
-    };
-
-    strncpy((char *)wifi_config.sta.ssid, network->ssid, sizeof(wifi_config.sta.ssid) - 1);
-    strncpy((char *)wifi_config.sta.password, network->password, sizeof(wifi_config.sta.password) - 1);
-
-    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
-    esp_wifi_connect();
-#endif
-}
-
-static void try_next_network(void)
-{
-#if CONFIG_WIFI_ENABLED
-    s_current_network_index++;
-    s_retry_num = 0;
-
-    if (s_current_network_index < s_wifi_network_count)
-    {
-        connect_to_network(s_current_network_index);
-    }
-    else
-    {
-        ESP_LOGE(TAG, "Failed to connect to any configured network");
-        led_behavior_t led0_behavior = {
-            .index = 0,
-            .mode = LED_MODE_BLINK,
-            .color = {.red = 50, .green = 0, .blue = 0},
-            .on_time_ms = 1000,
-            .off_time_ms = 500,
-        };
-        led_status_set_behavior(led0_behavior);
-        xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
-    }
-#endif
-}
-
-static void event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data)
-{
-#if CONFIG_WIFI_ENABLED
-    if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START)
-    {
-        led_behavior_t led0_behavior = {
-            .index = 0,
-            .mode = LED_MODE_BLINK,
-            .color = {.red = 50, .green = 50, .blue = 0},
-            .on_time_ms = 200,
-            .off_time_ms = 200,
-        };
-        led_status_set_behavior(led0_behavior);
-
-        connect_to_network(s_current_network_index);
-    }
-    else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED)
-    {
-        if (s_retry_num < CONFIG_WIFI_CONNECT_RETRIES)
-        {
-            led_behavior_t led0_behavior = {
-                .index = 0,
-                .mode = LED_MODE_BLINK,
-                .color = {.red = 50, .green = 50, .blue = 0},
-                .on_time_ms = 200,
-                .off_time_ms = 200,
-            };
-            led_status_set_behavior(led0_behavior);
-
-            s_retry_num++;
-            ESP_DIAG_EVENT(TAG, "Retrying network %d (%d/%d)", s_current_network_index + 1, s_retry_num,
-                           CONFIG_WIFI_CONNECT_RETRIES);
-            esp_wifi_connect();
-            return;
-        }
-
-        // Retries exhausted for current network, try next one
-        ESP_LOGW(TAG, "Failed to connect to network %d after %d retries, trying next...", s_current_network_index + 1,
-                 CONFIG_WIFI_CONNECT_RETRIES);
-        try_next_network();
-    }
-    else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP)
-    {
-        led_behavior_t led0_behavior = {
-            .index = 0,
-            .mode = LED_MODE_SOLID,
-            .color = {.red = 0, .green = 50, .blue = 0},
-        };
-        led_status_set_behavior(led0_behavior);
-
-        ip_event_got_ip_t *event = (ip_event_got_ip_t *)event_data;
-        ESP_DIAG_EVENT(TAG, "Got IP address:" IPSTR " (network %d: %s)", IP2STR(&event->ip_info.ip),
-                       s_current_network_index + 1, s_wifi_networks[s_current_network_index].ssid);
-        s_retry_num = 0;
-        xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
-    }
-#endif
-}
-
-void wifi_manager_init()
-{
-    s_wifi_event_group = xEventGroupCreate();
-    s_retry_num = 0;
-
-    ESP_ERROR_CHECK(esp_netif_init());
-    ESP_ERROR_CHECK(esp_event_loop_create_default());
-
-    // Access Point erstellen
-    esp_netif_create_default_wifi_ap();
-
-    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
-    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
-
+    ESP_ERROR_CHECK(esp_wifi_stop());
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_AP));
     wifi_config_t ap_config = {.ap = {.ssid = "system-control",
                                       .ssid_len = strlen("system-control"),
                                       .password = "",
                                       .max_connection = 4,
                                       .authmode = WIFI_AUTH_OPEN}};
-    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_AP));
     ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_AP, &ap_config));
     ESP_ERROR_CHECK(esp_wifi_start());
+    ESP_LOGI(TAG, "Access Point 'system-control' started");
+    dns_server_start("192.168.4.1");
 
-    ESP_LOGI(TAG, "Access Point 'system-control' gestartet");
+    led_behavior_t led_behavior = {
+        .color = {.red = 50, .green = 0, .blue = 0},
+        .index = 0,
+        .mode = LED_MODE_SOLID,
+    };
+    led_status_set_behavior(led_behavior);
+}
 
-    // DNS Hijack Server starten (alle DNS-Anfragen auf AP-IP umleiten)
-    dns_server_start("192.168.4.1"); // ggf. dynamisch ermitteln
+void wifi_manager_init()
+{
+    s_wifi_event_group = xEventGroupCreate();
 
-    // API-Server starten
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+
+    // Try to load stored WiFi configuration
+    persistence_manager_t pm;
+    char ssid[33] = {0};
+    char password[65] = {0};
+    bool have_ssid = false, have_password = false;
+    if (persistence_manager_init(&pm, "wifi_config") == ESP_OK)
+    {
+        persistence_manager_get_string(&pm, "ssid", ssid, sizeof(ssid), "");
+        persistence_manager_get_string(&pm, "password", password, sizeof(password), "");
+        have_ssid = strlen(ssid) > 0;
+        have_password = strlen(password) > 0;
+    }
+
+    if (have_ssid && have_password)
+    {
+        led_behavior_t led_behavior = {
+            .on_time_ms = 250,
+            .off_time_ms = 100,
+            .color = {.red = 50, .green = 50, .blue = 0},
+            .index = 0,
+            .mode = LED_MODE_BLINK,
+        };
+        led_status_set_behavior(led_behavior);
+
+        ESP_LOGI(TAG, "Found WiFi configuration: SSID='%s'", ssid);
+        wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+        ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+        ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
+        wifi_config_t wifi_config = {0};
+        strncpy((char *)wifi_config.sta.ssid, ssid, sizeof(wifi_config.sta.ssid) - 1);
+        strncpy((char *)wifi_config.sta.password, password, sizeof(wifi_config.sta.password) - 1);
+        wifi_config.sta.threshold.authmode = WIFI_AUTH_WPA2_PSK;
+        ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
+        ESP_ERROR_CHECK(esp_wifi_start());
+
+        int retries = 0;
+        EventBits_t bits;
+        do
+        {
+            esp_wifi_connect();
+            bits = xEventGroupWaitBits(s_wifi_event_group, WIFI_CONNECTED_BIT | WIFI_FAIL_BIT, pdFALSE, pdFALSE,
+                                       5000 / portTICK_PERIOD_MS);
+            if (bits & WIFI_CONNECTED_BIT)
+            {
+                led_behavior_t led_behavior = {
+                    .index = 0,
+                    .color = {.red = 0, .green = 50, .blue = 0},
+                    .mode = LED_MODE_SOLID,
+                };
+                led_status_set_behavior(led_behavior);
+                ESP_LOGI(TAG, "WiFi connection established successfully");
+                break;
+            }
+            retries++;
+        } while (!(bits & WIFI_CONNECTED_BIT) && retries < CONFIG_WIFI_CONNECT_RETRIES);
+
+        if (!(bits & WIFI_CONNECTED_BIT))
+        {
+            ESP_LOGW(TAG, "WiFi connection failed, switching to Access Point mode");
+            wifi_create_ap();
+        }
+    }
+    else
+    {
+        // Create Access Point
+        esp_netif_create_default_wifi_ap();
+        wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+        ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+        wifi_create_ap();
+    }
+
+    // API server start
     api_server_config_t s_config = API_SERVER_CONFIG_DEFAULT();
     ESP_ERROR_CHECK(api_server_start(&s_config));
 }

firmware/components/led-manager/include/color.h

@@ -12,9 +12,9 @@ typedef struct
 
 typedef struct
 {
-    uint8_t h;
-    uint8_t s;
-    uint8_t v;
+    float h;
+    float s;
+    float v;
 } hsv_t;
 
 __BEGIN_DECLS

firmware/components/led-manager/src/color.c

@@ -45,10 +45,10 @@ rgb_t interpolate_color_hsv(rgb_t start, rgb_t end, float factor)
 
     // Interpolate HSV values
     hsv_t interpolated_hsv;
-    interpolated_hsv.h = fmod(h1 + (h2 - h1) * factor, 360.0);
-    if (interpolated_hsv.h < 0)
+    interpolated_hsv.h = fmodf(h1 + (h2 - h1) * factor, 360.0f);
+    if (interpolated_hsv.h < 0.0f)
     {
-        interpolated_hsv.h += 360.0;
+        interpolated_hsv.h += 360.0f;
     }
     interpolated_hsv.s = start_hsv.s + (end_hsv.s - start_hsv.s) * factor;
     interpolated_hsv.v = start_hsv.v + (end_hsv.v - start_hsv.v) * factor;

firmware/components/persistence-manager/include/persistence_manager.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <esp_err.h>
 #include <nvs.h>
 #include <nvs_flash.h>
 #include <stdbool.h>
@@ -33,14 +34,14 @@ extern "C"
      * @param pm Pointer to the persistence manager structure.
      * @param nvs_namespace Namespace to use for NVS operations.
      */
-    void persistence_manager_init(persistence_manager_t *pm, const char *nvs_namespace);
+    esp_err_t persistence_manager_init(persistence_manager_t *pm, const char *nvs_namespace);
 
     /**
      * @brief Deinitialize the persistence manager and release resources.
      *
      * @param pm Pointer to the persistence manager structure.
      */
-    void persistence_manager_deinit(persistence_manager_t *pm);
+    esp_err_t persistence_manager_deinit(persistence_manager_t *pm);
 
     /**
      * @brief Check if the persistence manager is initialized.

firmware/components/persistence-manager/src/persistence_manager.c

@@ -4,10 +4,10 @@
 
 #define TAG "persistence_manager"
 
-void persistence_manager_init(persistence_manager_t *pm, const char *nvs_namespace)
+esp_err_t persistence_manager_init(persistence_manager_t *pm, const char *nvs_namespace)
 {
     if (!pm)
-        return;
+        return ESP_ERR_INVALID_ARG;
     strncpy(pm->nvs_namespace, nvs_namespace ? nvs_namespace : "config", sizeof(pm->nvs_namespace) - 1);
     pm->nvs_namespace[sizeof(pm->nvs_namespace) - 1] = '\0';
     pm->initialized = false;
@@ -16,20 +16,20 @@ void persistence_manager_init(persistence_manager_t *pm, const char *nvs_namespa
     {
         pm->initialized = true;
         ESP_LOGI(TAG, "Initialized with namespace: %s", pm->nvs_namespace);
+        return ESP_OK;
     }
-    else
-    {
-        ESP_LOGE(TAG, "Failed to open NVS handle: %s", esp_err_to_name(err));
-    }
+    ESP_LOGE(TAG, "Failed to open NVS handle: %s", esp_err_to_name(err));
+    return err;
 }
 
-void persistence_manager_deinit(persistence_manager_t *pm)
+esp_err_t persistence_manager_deinit(persistence_manager_t *pm)
 {
     if (pm && pm->initialized)
     {
         nvs_close(pm->nvs_handle);
         pm->initialized = false;
     }
+    return ESP_OK;
 }
 
 bool persistence_manager_is_initialized(const persistence_manager_t *pm)

firmware/main/app_task.cpp

@@ -186,10 +186,7 @@ void app_task(void *args)
     setup_buttons();
     init_ui();
 
-#if CONFIG_WIFI_ENABLED
     wifi_manager_init();
-    analytics_init();
-#endif
 
     start_simulation();
 

firmware/storage/www/captive.html

@@ -27,25 +27,9 @@
                 </button>
             </div>
             <h1>🚂 System Control</h1>
-            <p data-i18n="captive.subtitle">WLAN-Einrichtung</p>
         </div>
 
         <div class="card">
-            <div id="scan-section">
-                <button class="btn btn-secondary" onclick="scanNetworks()" data-i18n="captive.scan">
-                    📡 Netzwerke suchen
-                </button>
-
-                <div id="loading" class="loading">
-                    <div class="spinner"></div>
-                    <p data-i18n="captive.scanning">Suche nach Netzwerken...</p>
-                </div>
-
-                <div id="network-list" class="network-list" style="display: none;"></div>
-            </div>
-
-            <div class="divider"><span data-i18n="captive.or.manual">oder manuell eingeben</span></div>
-
             <div class="form-group">
                 <label for="ssid" data-i18n="wifi.ssid">WLAN-Name (SSID)</label>
                 <input type="text" id="ssid" data-i18n-placeholder="wifi.ssid.placeholder"
@@ -62,7 +46,8 @@
             </div>
 
             <div class="btn-group">
-                <button class="btn btn-primary" onclick="saveWifi()" data-i18n="captive.connect">
+                <button class="btn btn-primary" id="connect-btn" onclick="saveWifi()" data-i18n="captive.connect"
+                    disabled>
                     💾 Verbinden
                 </button>
             </div>
@@ -112,12 +97,21 @@
             setTheme(current === 'dark' ? 'light' : 'dark');
         }
 
+        // Button aktivieren/deaktivieren
+        function updateConnectBtn() {
+            const ssid = document.getElementById('ssid').value;
+            const pw = document.getElementById('password').value;
+            const btn = document.getElementById('connect-btn');
+            btn.disabled = !(ssid.length > 0 && pw.length > 0);
+        }
+
         // Initialize on load
         document.addEventListener('DOMContentLoaded', () => {
             initTheme();
             initI18n();
-            // Auto-scan on load
-            setTimeout(scanNetworks, 500);
+            document.getElementById('ssid').addEventListener('input', updateConnectBtn);
+            document.getElementById('password').addEventListener('input', updateConnectBtn);
+            updateConnectBtn();
         });
 
         // Toggle password visibility

firmware/storage/www/css/captive.css

@@ -39,6 +39,15 @@ body {
     box-shadow: 0 4px 20px var(--shadow);
 }
 
+#connect-btn:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+    pointer-events: none;
+    box-shadow: none;
+    background-color: #888 !important;
+}
+}
+
 /* Form Group - More spacing */
 .form-group {
     margin-bottom: 16px;

firmware/storage/www/index.html

@@ -16,7 +16,6 @@
 <body>
     <div class="container">
         <div class="header">
-            <h1>🚂 System Control</h1>
             <div class="header-controls">
                 <button class="lang-toggle" onclick="toggleLanguage()" aria-label="Sprache wechseln">
                     <span class="lang-flag" id="lang-flag">🇩🇪</span>
@@ -27,6 +26,7 @@
                     <span class="theme-toggle-label" id="theme-label">Dark</span>
                 </button>
             </div>
+            <h1>🚂 System Control</h1>
         </div>
 
         <div class="tabs">

firmware/storage/www/js/wifi-shared.js

@@ -43,6 +43,13 @@ async function scanNetworks() {
 
     try {
         const response = await fetch('/api/wifi/scan');
+        if (!response.ok) {
+            // Fehlerhafte API-Antwort, aber ESP32 ist erreichbar
+            const errorText = await response.text();
+            showStatus('wifi-status', t('wifi.error.scan') + ': ' + errorText, 'error');
+            if (loading) loading.classList.remove('active');
+            return;
+        }
         const networks = await response.json();
 
         if (loading) {
@@ -92,43 +99,43 @@ async function scanNetworks() {
         if (loading) {
             loading.classList.remove('active');
         }
-
-        // Demo mode for local testing
-        const demoNetworks = [
-            { ssid: 'Demo-Netzwerk', rssi: -45 },
-            { ssid: 'Gast-WLAN', rssi: -67 },
-            { ssid: 'Nachbar-WiFi', rssi: -82 }
-        ];
-
-        if (networkList) {
-            demoNetworks.forEach(network => {
-                const signalIcon = getSignalIcon(network.rssi);
-                const item = document.createElement('div');
-                item.className = 'network-item';
-                item.onclick = () => selectNetwork(network.ssid, item);
-                item.innerHTML = `
-                    <span class="network-name">
-                        <span class="signal-icon">${signalIcon}</span>
-                        ${escapeHtml(network.ssid)}
-                    </span>
-                    <span class="network-signal">${network.rssi} dBm</span>
-                `;
-                networkList.appendChild(item);
-            });
-            networkList.style.display = 'block';
+        // Nur bei Netzwerkfehlern Demo-Daten anzeigen
+        if (error instanceof TypeError) {
+            const demoNetworks = [
+                { ssid: 'Demo-Netzwerk', rssi: -45 },
+                { ssid: 'Gast-WLAN', rssi: -67 },
+                { ssid: 'Nachbar-WiFi', rssi: -82 }
+            ];
+            if (networkList) {
+                demoNetworks.forEach(network => {
+                    const signalIcon = getSignalIcon(network.rssi);
+                    const item = document.createElement('div');
+                    item.className = 'network-item';
+                    item.onclick = () => selectNetwork(network.ssid, item);
+                    item.innerHTML = `
+                        <span class="network-name">
+                            <span class="signal-icon">${signalIcon}</span>
+                            ${escapeHtml(network.ssid)}
+                        </span>
+                        <span class="network-signal">${network.rssi} dBm</span>
+                    `;
+                    networkList.appendChild(item);
+                });
+                networkList.style.display = 'block';
+            }
+            if (select) {
+                select.innerHTML = `<option value="">${t('wifi.scan.hint')}</option>`;
+                demoNetworks.forEach(network => {
+                    const option = document.createElement('option');
+                    option.value = network.ssid;
+                    option.textContent = `${network.ssid} (${network.rssi} dBm)`;
+                    select.appendChild(option);
+                });
+            }
+            showStatus('wifi-status', 'Demo: ' + t('wifi.networks.found', { count: demoNetworks.length }), 'info');
+        } else {
+            showStatus('wifi-status', t('wifi.error.scan') + ': ' + error.message, 'error');
         }
-
-        if (select) {
-            select.innerHTML = `<option value="">${t('wifi.scan.hint')}</option>`;
-            demoNetworks.forEach(network => {
-                const option = document.createElement('option');
-                option.value = network.ssid;
-                option.textContent = `${network.ssid} (${network.rssi} dBm)`;
-                select.appendChild(option);
-            });
-        }
-
-        showStatus('wifi-status', 'Demo: ' + t('wifi.networks.found', { count: demoNetworks.length }), 'info');
     }
 }