We have a new choice to write firmware for microcomputers(microcontrollers). It's mruby/c.
This talk shows how to introduce mruby/c firmware programming. And besides, my actual IoT project for Japanese Sake brewery will be described.
Since mruby/c is still a young growing tool, you will know there are several(many?) things you can help it to become better.

RubyKaigi 2018 https://rubykaigi.org/2018/presentations/hasumon

RubyKaigi 2018