To save power and as a fun project I'd like to make a remote interface for my 2005 Hot Spring Sovereign so I can adjust the temperature from my phone. It has an IQ2020 controller which has an i2c interface. Do you know how I can get a manual documenting this interface? Or is there someone in the SF Bay Area with a Navigator RF Remote which I can watch operate using a Saleae logic analyzer? Can you help in any other way?
So far I've been decoding the messages on the bus using a python script, but it will take a while to work out enough of the bits to have confidence to start sending messages back. I'm guessing the controller reads from the remote on 7-bit address 18, 3E, 36, or 44. I've only seen the remotes on sale for >$400, pricy given that I expect the parts for a wireless internet remote to be under $100. I understand that I am likely voiding the warranty but suspect fiddling with i2c is fairly low risk of damage beyond what can be fixed by power cycling or replacing the controller board.
I found a similar thread from years ago, but it seems to have died.
Thanks!