* https://technomancy.us/talks/fennel-nodemcu
* https://www.arduino.cc/
* https://www.raspberrypi.org/
* http://esp8266.net/
* https://wiki.wemos.cc/products:d1:d1_mini
* https://www.lua.org/
* https://fennel-lang.org/
* https://nodemcu.readthedocs.io/en/master/
* https://nodemcu-build.com/
* https://p.hagelb.org/hello-joe.gif