Bticino fc80gt

Hallo Giovanni and welcome to the community.
The device you refer to is part of the new Living Now series by BTicino, not compatible with the OpenWebNet protocol, this is why the OpenWebNet (BTicino/Legrand) binding does not support it.

There was an initial idea to support the “Works with Legrand” API, thus the mentioned FC80GT gateway, by a new binding for openHAB here: