Remove all files but the pin_mapping.json from filesystem on factory reset

This allows to create more user defined files and get them deleted on factory reset.

include/Utils.h

@@ -11,4 +11,5 @@ public:
     static int getTimezoneOffset();
     static void restartDtu();
     static bool checkJsonAlloc(const DynamicJsonDocument& doc, const char* function, const uint16_t line);
+    static void removeAllFiles();
 };

src/Utils.cpp

@@ -6,7 +6,9 @@
 #include "Display_Graphic.h"
 #include "Led_Single.h"
 #include "MessageOutput.h"
+#include "PinMapping.h"
 #include <Esp.h>
+#include <LittleFS.h>
 
 uint32_t Utils::getChipId()
 {
@@ -76,3 +78,17 @@ bool Utils::checkJsonAlloc(const DynamicJsonDocument& doc, const char* function,
 
     return true;
 }
+
+/// @brief Remove all files but the PINMAPPING_FILENAME
+void Utils::removeAllFiles()
+{
+    auto root = LittleFS.open("/");
+    auto file = root.getNextFileName();
+
+    while (file != "") {
+        if (file != PINMAPPING_FILENAME) {
+            LittleFS.remove(file);
+        }
+        file = root.getNextFileName();
+    }
+}

src/WebApi_config.cpp

@@ -108,7 +108,7 @@ void WebApiConfigClass::onConfigDelete(AsyncWebServerRequest* request)
     response->setLength();
     request->send(response);
 
-    LittleFS.remove(CONFIG_FILENAME);
+    Utils::removeAllFiles();
     Utils::restartDtu();
 }