I'm working with fschuetz on this project. We are working with the Espressif platform 6.8.0 which uses the framework-espidf 5.3.0. The toolchain is toolchain-xtensa-esp-elf version 13.2.0+20240530. According to the espressif/crosstool-NG repository, this toolchain is built with: CT_NEWLIB_DEVEL_URL=...