From Hentschel
/* Homekit setup */
== Homekit setup ==
* setup instructions here: https://docs.openhab.org/addons/bindings/mqtt1/readme.html
* there is a issue with the homekit addon overwriting the generated mac address on exit (I think). See https://github.com/openhab/openhab2-addons/issues/1822
** for now, after successful pairing, set /var/lib/openhab2/jsondb/homekit.json read only after successful pairing. May have to undo to re-create a new pairing