Use light weight OS [0] and/or build/setup own custom os/software setuplinux from scratch [1]; Yocto [2]; internet of things related os/software, contiki [3]

[0] : https://en.wikipedia.org/wiki/Light-weight_Linux_distributio...

[1] Linux from scratch : https://www.linuxfromscratch.org/

[2] Yocto : https://www.yoctoproject.org/

[3] Contiki : https://docs.contiki-ng.org/en/develop/