Hello, I've read all your requirements.
I have rich experience in c++ programming and embedded firmware developments.
I developed several AI products(Smart Face Lock, Facial Recognition Module, and Facial Recognition Access Control) with the v3s, allwinner a20, and rv1108 on embedded Linux.
I also have experience in developing arm 9 series STM32 and nuvoton firmware.
I'd like to discuss your projects.
Best Regards.