Welcome to My Vintage Tech Blog

Below are previews of the latest posts:

• Reverse Engineering the Resideo Thermostat API: Full Home Assistant Control Without a Developer Key

  The Honeywell Lyric T6 Pro WiFi (TH6320WF2003) is a perfectly good thermostat with a perfectly broken Home Assistant integration story. The official HA integration requires a developer API key from Resideo. The developer program has been effectively dead for years — applications sit in “pending review” indefinitely, and the few developers who got keys report chronic API outages.

• Reverse Engineering the Govee Pool Thermometer: Getting H5109 Data Into Home Assistant

  The Govee H5109 is a floating pool thermometer that pairs with an H5042 WiFi gateway hub. Temperature shows up in the Govee app just fine. Getting it into Home Assistant? That’s a different story.

• Reverse Engineering the Gulfstream Compass WiFi Pool Heater: A Complete API Guide for Home Assistant

  If you own a Gulfstream pool heat pump with the Compass WiFi controller, you’ve probably experienced the app. The reviews on Google Play tell the story: 1.71 stars, connection issues, no temperature history, no third-party integration. The Compass WiFi system is a walled garden — your pool heater data goes into their cloud and the only way to get it out is through their mediocre app.

• Dissecting the HDOS Diskette

  By E. Tom Jorgenson — Microcomputing, July 1981

  Digitized and extended by Igor Biletski, 2025.