Thank you for these explanations - rfxcom configuration makes much more sense to me now !
I thought that the “pencil” icon meant that I was in “edit mode” so I was surprised at the lack of settable parameters and it did not occur to me that it was actually a button to do just that… The “checkmark” button has “Save” tooltip - maybe the “pencil” button should have an “edit settings” tooltip ? Should I file an UI bug ? I looked at https://github.com/openhab/ but can’t find the repository for the PaperUI…
Since I had my Oregon Scientific probes working, I guess I got it right once… And forgot about it… Lack of sleep because of 3 AM tinkering doesn’t help memory and I was looking at configuration/bindings/rfxcom instead of configuration/things/view/rfxcom:bridge
And back to the matter that got me here - I got Openhab to work with the Chacon DiO 54781 433Mhz door sensor, with the AC protocol through the Rfxlan… I’m pleased !