@mpvader not sure if this is still of interest.
Kostal Plenticore Plus G2 pure detection is fixed with the new modbus config options which is great.
Also all data seem to be available.
However limiting is not working. The limits are calculated but not sent to the device.
I fixed it by creating the simple NR Flow as somehow the built-in limiting function does not manage to get the limit to the inverter.
From a testing perspectice I am also limited 
at the moment due to weather conditions.