Hey @Ltty and @Ondrej_Pecta,
I sent Ondrej my “fresh” log files. As soon as there is a diagnosis, one of us will surely share it here.
An addition to my previous post: during the time OpenHAB returns Authentication Challenge errors and I can’t control Somfy equipment through OpenHAB, I still can login and use the equipment just fine using the Tahoma and Connexoon apps on my phone. I don’t know if this information helps, but the more info the better I guess.
Cheers,
Gregory