Hello Jan_Brede_Boen, and welcome!
I realize you are a new member, but I’d like to say it"s sort of pointless to create new topics for existing app devices when there’s a dedicated app topic available.
App developers don’t scan the complete forum all day 
and other users can’t help you on this one.
When posting your request in the matching app topic, the dev gets nudged.
There’s multiple Sonoff apps by the way:
When it’s about an “official” app, look for contact info on the app page at the homey.app store as well, because not every app gets accompanied by a matching forum topic.
