It appears Home Assistant’s official PrusaLink integration is not yet compatible with the PrusaLink API shipped with a MK4 printer. This project was put together as a temp solution to fix my existing automations requiring various metrics from the Printer’s API.
You can follow the HA issue here:
https://github.com/home-assistant/core/issues/95529
Same with MainsailOS/Klipper. It’s been great being able to view my PiCam from anywhere to see how the print is doing. Now I just need a reliable lighting solution.