Patch for ESP-IDF

Since some bug fixes of esp-idf may not be synced to GitHub, you need to manually apply some patches to build the example.

Apply Patch

You can apply the patch by entering the following command on the command line / terminal:

If you need to use SDIO NIC function, you need to apply idf_patch_x_x.patch.

cd $IDF_PATH
git apply /path/to/esp-gateway/idf_patch/idf_patch_x_x.patch

If you need to communicate between different data forwarding interfaces (ESP-IDF Release/v5.0), you need to apply ip4_forward.patch.
```
cd $IDF_PATH/components/lwip/lwip
git apply /path/to/esp-gateway/idf_patch/ip4_forward.patch
```