It wolud be great if we would have a kind of database of ladder programs that would implement basic smart activities like dimmers, roller shutters, lights, scenes etc. ready to use in conjuction with OpenHAB.
But if you do not know the ladder, this database will be useless, the ladder is specific, sometimes it is easier to write the code from scratch than to adopt it.
BTW. I currently rather recommend to use modbus binding instead of fatek binding as it works in my opinion currently much better (in opposite to the previous generation of modbus binding).
Why? Modbus binding is only TCP, Fatek binding works on UDP wich is much faster and does not load the local network so much, opposition to TCP.