Currently I am working on an openhab implementation for the KSE Wallbox (made in Germany).
For now I just do it the “quick&dirty” way. But if anyone is interested in the implementation I would share it with the community.
The Wallbox communicates through Modbus and comes with a lot of features. It is easy to write rules for surplus-charging and you are even able to switch between 1 and 3 Phase loading by on Modbus-command.
Just let me know.