Setup for debugging Arduino and LwIP behaviour under full ESP-IDF build system.

1. Init submodules

git submodule update --init --recursive

Due to a Arduino having C++-ish compilation rules a patch in components/AsyncTCP/CMakeLists.txt is required to compile the project.

target_compile_options(${COMPONENT_TARGET} PRIVATE -fno-rtti -Wno-error=address)

2. Setup the ESP-IDF environment

Install recommended ESP-IDF extension for VSCode. Run >ESP-IDF: Configure ESP-IDF Extension and follow configuration steps.

Personally I have installed the ESP-IDF toolchain files to seperate folders to accomodate multiple versions of the ESP-IDF:

~/esp-idf
    v4/
    tools-v4/
    v5/
    tools-v5/

To do this select Advanced installation and set the ESP-IDF Path and ESP-IDF Tools Path to the appropriate folders.

3. Setup and build

Open terminal via >ESP-IDF: Open ESP-IDF Terminal task and setup WiFi in Example Connection Configuration menu:

idf.py menuconfig

Exit and save the configuration. Then build the project:

idf.py build

4. Flash and monitor

idf.py flash monitor
# or use a better serial monitor
idf.py flash && tio /dev/ttyACM0 -b 115200

Built-in monitor can by closed by pressing Ctrl+]. To close tio press Ctrl+t q.

Launch Launch configuration in VSCode Run and Debug tab. This will start the GDB server and attach to the target. You can now set breakpoints and inspect the code.

Good luck.