I agree it was very strange. But again, it was the CNI unit itself that was changing on me (I could see this using the IP utility on Windows), not the homebridge or cgate configs. Which reminds me, it would be great if the instructions made it very clear to a newbie that the Homebridge CBUS plugin talks to a local cgate daemon, which itself talks to the CNI hardware, which itself talks to the rest of the CBUS hardware. The cgate install is not at all obvious from the outset, and I imagine a lot of people have started tweaking the homebridge config to point to the CNI directly (like I did along the way somewhere before I realised).