Fix crash with reboot (GwWifi + PageNavigation)

lib/gwwifi/GwWifi.cpp

@@ -132,18 +132,40 @@ void GwWifi::loop(){
             {
                 LOG_DEBUG(GwLog::LOG,"wifiClient: retry connect to %s", wifiSSID->asCString());
 
-                // CRITICAL SECTION: WiFi-Operationen müssen serialisiert werden
+                // Keep locked sections short to avoid cross-core stalls/WDT.
                 if (acquireMutex()){
                     WiFi.disconnect(true);
-                    delay(300);
-                    esp_wifi_stop();
-                    delay(100);
-                    esp_wifi_start();
                     releaseMutex();
+                }
+                else{
+                    LOG_DEBUG(GwLog::ERROR,"GwWifi: mutex timeout in loop (disconnect)");
+                }
+
+                delay(300);
+
+                if (acquireMutex()){
+                    esp_err_t stopErr=esp_wifi_stop();
+                    releaseMutex();
+                    if (stopErr != ESP_OK){
+                        LOG_DEBUG(GwLog::ERROR,"GwWifi: esp_wifi_stop failed: %d",(int)stopErr);
+                    }
+                }
+                else{
+                    LOG_DEBUG(GwLog::ERROR,"GwWifi: mutex timeout in loop (stop)");
+                }
+
+                delay(100);
+
+                if (acquireMutex()){
+                    esp_err_t startErr=esp_wifi_start();
+                    releaseMutex();
+                    if (startErr != ESP_OK){
+                        LOG_DEBUG(GwLog::ERROR,"GwWifi: esp_wifi_start failed: %d",(int)startErr);
+                    }
                     connectInternal();
                 }
                 else{
-                    LOG_DEBUG(GwLog::ERROR,"GwWifi: mutex timeout in loop");
+                    LOG_DEBUG(GwLog::ERROR,"GwWifi: mutex timeout in loop (start)");
                 }
             }
         }

lib/obp60task/OBP60Extensions.h

@@ -316,6 +316,9 @@ inline void drawMonochromeBitmap(
                 getdisplay().drawPixel(x + xx, y + yy, color);
             }
         }
+        if ((yy & 0x0F) == 0) {
+            yield();
+        }
     }
     #else
     // E‑Paper: just hand over to driver (expects MSB‑first horizontal)

lib/obp60task/PageNavigation.cpp

@@ -394,8 +394,20 @@ bool showValues = false; // Show values HDT, SOG, DBT in navigation map
             int numPix = json["number_pixels"] | 0; // Read number of pixels
             imgWidth = json["width"] | 0;           // Read width of image
             imgHeight = json["height"] | 0;         // Read height og image
+            size_t requiredBytes = 0;
+            if (imgWidth > 0 && imgHeight > 0){
+                requiredBytes = (size_t)((imgWidth + 7) / 8) * (size_t)imgHeight;
+            }
+            if (requiredBytes == 0){
+                LOG_DEBUG(GwLog::ERROR,"Error PageNavigation: invalid image geometry w=%d h=%d",imgWidth,imgHeight);
+                return PAGE_UPDATE;
+            }
 
             const char* b64src = json["picture_base64"].as<const char*>();  // Read picture as Base64 content
+            if (b64src == nullptr){
+                LOG_DEBUG(GwLog::ERROR,"Error PageNavigation: picture_base64 missing");
+                return PAGE_UPDATE;
+            }
             size_t b64len = strlen(b64src);                                 // Calculate length of Base64 content
             // Copy Base64 content in PSRAM
             char* b64 = (char*) heap_caps_malloc(b64len + 1, MALLOC_CAP_SPIRAM);    // Allcate PSRAM for Base64 content
@@ -407,7 +419,10 @@ bool showValues = false; // Show values HDT, SOG, DBT in navigation map
 
             // Set image buffer in PSRAM
             //size_t imgSize = getdisplay().width() * getdisplay().height();
-            size_t imgSize = numPix;    // Calculate image size
+            size_t imgSize = (numPix > 0) ? (size_t)numPix : requiredBytes;    // Calculate image size
+            if (imgSize < requiredBytes){
+                imgSize = requiredBytes;
+            }
             uint8_t* imageData = (uint8_t*) heap_caps_malloc(imgSize, MALLOC_CAP_SPIRAM);           // Allocate PSRAM for image
             if (!imageData) {
                 LOG_DEBUG(GwLog::ERROR,"Error PageNavigation: PSRAM alloc image buffer failed");
@@ -417,17 +432,30 @@ bool showValues = false; // Show values HDT, SOG, DBT in navigation map
 
             // Decode Base64 content to image
             size_t decodedSize = 0;
-            decoder.decodeBase64(b64, imageData, imgSize, decodedSize);
+            bool decodeOk = decoder.decodeBase64(b64, imageData, imgSize, decodedSize);
+            if (!decodeOk || decodedSize < requiredBytes){
+                LOG_DEBUG(GwLog::ERROR,
+                    "Error PageNavigation: decode failed (ok=%d, decoded=%u, required=%u)",
+                    decodeOk ? 1 : 0,
+                    (unsigned int)decodedSize,
+                    (unsigned int)requiredBytes
+                );
+                free(b64);
+                free(imageData);
+                return PAGE_UPDATE;
+            }
 
             // Copy actual navigation man to ackup map
             imageBackupWidth  = imgWidth;
             imageBackupHeight = imgHeight;
             imageBackupSize   = imgSize;
-            if (decodedSize > 0) {
+            if (decodedSize > 0 && imageBackupData != nullptr) {
-                memcpy(imageBackupData, imageData, decodedSize);
+                size_t backupCapacity = (size_t)GxEPD_WIDTH * (size_t)GxEPD_HEIGHT;
-                imageBackupSize = decodedSize;
+                size_t copySize = (decodedSize > backupCapacity) ? backupCapacity : decodedSize;
+                memcpy(imageBackupData, imageData, copySize);
+                imageBackupSize = copySize;
             }
-            hasImageBackup = true;
+            hasImageBackup = (imageBackupData != nullptr);
             lostCounter = 0;
 
             // Show image (navigation map)