Image Install Method

Oasis Spa can be installed most simply by starting with a full pre-installed image. This method will allow you to simply download a full OS image and drop it on a SD card, put it in a Pi and boot it up. The only thing to do is to configure the web interface and if your tub has MQTT devices configure the Hallonlarm.config file.

In this WIKI page, the only instructions supplied are high-level. I'll assume you know you how to image your RPi SD card and boot it up.

check the releases, download the latest image file
Unzip it
Use some sort of image writing program such as Etcher to write the file
Put it in your Raspberry and boot it.
Run 'raspi-config' to setup stuff, and things

Expand File system -> reboot

Figure out your Network Settings. Highly recommended that you make the address static, really. The IoT switches will be looking for a specific IP
Open a browser, the DNS name of Oasis Spa is http://Oasis-Spa you may have to use http://RPi-IPADDRESS if dns isn't working for you. 7a. figure out DNS, your wife will thank you. Actually, she won't notice because it will 'just work'
Configure Switches/Relays, Sensors to your specific setup. If you are going full IoT, then the quickest way is to have your Pump listen to tub/pump/relay/0 and tub/heater/relay/0 this is the default Hallonlarm.conf setup. Sensors need to be individulally configured, see Sensors Wiki section.

Original code by Rick Feenstra used with permission Instructables