@wattba as a new member you may have missed the threads that describe running HA via F1/F2 rather than F3/F4, which leaves the latter to communicate solely with the WRC. (As a minimum all you need for the F1/F2 to HA setup is an RS485-to-Ethernet or RS485-to-USB adapter, and @pantherale0’s Samsung Integration. The Integration may require a VM such as VirtualBox to run it - see the Samsung ASHP NASA Messages - Updated Table thread for details and links.)