Special note !

Several developers have gotten together to work out the serial protocol. Check our work on this wiki: https://github.com/ccutrer/balboa_worldwide_app/wiki

My research on Google Docs

https://docs.google.com/document/d/1s4A0paeGc89k6Try2g3ok8V9BcYm5CXhDr1ys0qUT4s/edit?usp=drivesdk&authuser=0

Initial steps

npm install serialport

Need to enable serial port

sudo raspi-config no to login over serial yes to enable serial

If using Pi zero W, Pi 3 or 4 (so any Pis with bluetooth), watch out !

As per serialport/node-serialport#1583, you must disable bluetooth: Add "dtoverlay=pi3-disable-bt" in /boot/config.txt

crontab

@reboot /home/pi/spaControl/start_hotTub.sh

Uses port 9000