This plugin will connect to Spas/Hot-tubs via their Balboa wifi module, and expose a set of controls (pumps, lights, etc) and the spa temperature, and temperature control thermostat, in HomeKit. It ...
Let's be honest here...I have a day job...this is me hacking over weekends and nights to figure this out. I used a logic analyzer to snoop on the bus (it is serial BTW) and then found some people ...