Added Telemetry data report to the App

vesper/src/FileManager/FileManager.cpp

@@ -175,6 +175,52 @@ size_t FileManager::getFileSize(const String& filePath) {
     return size;
 }
 
+bool FileManager::writeJsonFile(const String& filePath, JsonDocument& doc) {
+    if (!initializeSD()) {
+        return false;
+    }
+    
+    File file = SD.open(filePath.c_str(), FILE_WRITE);
+    if (!file) {
+        LOG_ERROR("Failed to open file for writing: %s", filePath.c_str());
+        return false;
+    }
+    
+    if (serializeJson(doc, file) == 0) {
+        LOG_ERROR("Failed to write JSON to file: %s", filePath.c_str());
+        file.close();
+        return false;
+    }
+    
+    file.close();
+    LOG_DEBUG("JSON file written successfully: %s", filePath.c_str());
+    return true;
+}
+
+bool FileManager::readJsonFile(const String& filePath, JsonDocument& doc) {
+    if (!initializeSD()) {
+        return false;
+    }
+    
+    File file = SD.open(filePath.c_str(), FILE_READ);
+    if (!file) {
+        LOG_ERROR("Failed to open file for reading: %s", filePath.c_str());
+        return false;
+    }
+    
+    DeserializationError error = deserializeJson(doc, file);
+    file.close();
+    
+    if (error) {
+        LOG_ERROR("Failed to parse JSON from file: %s, error: %s", 
+                 filePath.c_str(), error.c_str());
+        return false;
+    }
+    
+    LOG_DEBUG("JSON file read successfully: %s", filePath.c_str());
+    return true;
+}
+
 // ════════════════════════════════════════════════════════════════════════════
 // HEALTH CHECK IMPLEMENTATION
 // ════════════════════════════════════════════════════════════════════════════