Home Assistant Integration
The Pod Management app is a fork of Home Assistant Companion apps: https://github.com/home-assistant/android and https://github.com/home-assistant/iOS
The Home Assistant Companion apps are part of a software ecosystem that the Home Assistant team is maintaining. Our pods will be running an instance of Home Assistant on a Raspberry Pi (actually using https://github.com/home-assistant/operating-system, that includes Home Assistant core and some extras). That HA instance is configured for accepting remote connections.
All the hardware is connected to the Raspberry Pi using different physical connections and different protocols. A breakdown of what connections/protocols are used and documentation on the hardware side of things can be found in the Home Automation documentation.