@Neep This is maybe not the answer you’re wanting.
I do not really use the official integration any more…
All my development time is with ramses_cc (and ramses_rf), which is available to add (manually) via HACS.
The ramses_cc integration can (or will eventually) do everything that the API-based integration can do, and a lot more.
It does not need the internet (but does need a USB dongle, about £40 - or cheaper if you make one).