Actually @markus7017 already started one, I’ll try to make it useable and contribute to it (carnet)
https://github.com/markus7017/openhab-addons/tree/carnet_snapshot/bundles/org.openhab.binding.carnet
Cf this thread: https://community.openhab.org/t/interest-in-carnet-binding-myaudi/92378