You can create your nibe heat pump via SG-Ready with a Shelly Plus 1.
VVM S320 / S2125 installation manual:
https://assetstore.nibe.se/hcms/v2.4/entity/document/875886/storage/ODc1ODg2LzAvbWFzdGVy/download/Installateurhandbuch_Luft%2FWasser-W%C3%A4rmepumpen_VVM%20S320_631802-4.pdf
In the installation manual, the instructions for connection and activation can be found on page 25/26.
If you work with a single Shelly, you can bridge a contact in order to change between both contacts or to change both contacts (overcapacity mode, normal operation).
SMO S40 installer instructions:
https://assetstore.nibe.se/hcms/v2.3/entity/document/877309/storage/ODc3MzA5LzAvbWFzdGVy
From page 26 you will find the connection and setting.
After the 2 aux were connected to the Shelly entrance and a cable to GND and Shelly output, SG-Ready must be placed on the two AUX connections in menu 7.4.
SG-Ready can then be acted in 4.2.3.