Arduino can be built with C20/C++20 or C17/C++17 by switching to the latest gcc-arm-none-eabi. Below shows 2 different ways one using arduino-cli and the other using a Makefile included in this repo.

This is an Arduino as IDF Project to build an ESP-Matter over Thread RGB Light using ESP32-C5/C6/H2 and ESP-Matter Arduino API This example shall work with Arduino 3.3.2+ and also IDF 5.5.1+ It is ...