Hi @Topaz,
In Monitoring Your Samsung ASHP Controller I outlined one method of accessing the controller inputs/outputs (I/O) on a PC, using a low-cost dongle connected to F1/F2, and the Samsung SNET-Pro2 software.
This approach had the advantage of simplicity, requiring no RPi or coding, nor any knowledge of Modbus/MQTT (whatever they are 
). But SNET is somewhat limited – although it offers the option of changing FSVs remotely, it doesn’t display all the information available at the remote controller (the MWR-WW10N) such as Outdoor Unit power consumption (instantaneous and integrated).
Is it possible for you to summarise what hardware/software you need for the Modbus/MQTT approach, how you go about learning to do the necessary coding, and what controller information you can access as a result? (In the above thread I had anticipated that another user would add this information but I haven’t heard from him since.)
Many thanks…