[ESP32] Fixed build failure in lighting-app and readme update

examples/lighting-app/esp32/README.md

@@ -120,6 +120,10 @@ make sure the IDF_PATH has been exported(See the manual setup steps above).
     export PATH=$PATH:path/to/connectedhomeip/out/host
     ```
 
+-   To erase flash of the chip.
+
+        $ idf.py -p /dev/tty.SLAB_USBtoUART erase-flash
+
     Below mentioned command generates the nvs image with test DAC with
     VID:0xFFF2 and PID:8001
 
@@ -171,6 +175,9 @@ make sure the IDF_PATH has been exported(See the manual setup steps above).
 
         $ idf.py -p /dev/tty.SLAB_USBtoUART monitor
 
+-   Commissioning over ble after flashing script, change the passcode, replace
+    `20202021` with `99663300`.
+
 ## Commissioning over BLE using chip-tool
 
 -   Please build the standalone chip-tool as described [here](../../chip-tool)

examples/lighting-app/esp32/main/main.cpp

@@ -31,6 +31,10 @@
 #include <app/server/Dnssd.h>
 #include <app/server/OnboardingCodesUtil.h>
 
+#if CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER
+#include <platform/ESP32/ESP32FactoryDataProvider.h>
+#endif // CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER
+
 using namespace ::chip;
 using namespace ::chip::DeviceManager;
 using namespace ::chip::DeviceLayer;
@@ -39,6 +43,12 @@ static const char * TAG = "light-app";
 
 static AppDeviceCallbacks EchoCallbacks;
 
+namespace {
+#if CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER
+ESP32FactoryDataProvider sFactoryDataProvider;
+#endif // CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER
+} // namespace
+
 static void InitServer(intptr_t context)
 {
     // Print QR Code URL
@@ -68,7 +78,6 @@ extern "C" void app_main()
 #if CONFIG_ENABLE_CHIP_SHELL
     chip::LaunchShell();
 #endif
-
     CHIPDeviceManager & deviceMgr = CHIPDeviceManager::GetInstance();
 
     CHIP_ERROR error = deviceMgr.Init(&EchoCallbacks);

examples/platform/esp32/common/Esp32AppServer.h

@@ -23,4 +23,4 @@
 
 namespace Esp32AppServer {
 void Init(AppDelegate * context = nullptr);
-}
+} // namespace Esp32AppServer