Homelynk modbus 1 byte unsigned integer

[RagingBull]

I forgot to mention that I've already tried to add the modbus datatypes with no success. When I try to do the reset, modbus error log returns "write failed: illegal function".

Here's the manual for the modbus gateway of the heatpump:
https://www.nibe.fi/nibedocuments/14059/031725-5.pdf

Any examples for the script? I'm not familiar with those.