ntshell as an esp-idf component (currently arduino port only, can be used without arduino core as well
Thanks to:
Natural Tiny Shell (NT-Shell) : https://www.cubeatsystems.com/ntshell/index.html credits: Shinichiro Nakamura (CuBeatSystems)
ABShell for ArduBoy, based on arduino core and ntshell : https://github.com/boochow/abshell credits: boochow