Looks like this module makes AC settings accessible through http: Mitsubishi-WF-RAC-Integration/custom_components/mitsubishi_wf_rac/wfrac/repository.py at main · jeatheak/Mitsubishi-WF-RAC-Integration · GitHub with some base64 encoded byte sequences: Mitsubishi-WF-RAC-Integration/custom_components/mitsubishi_wf_rac/wfrac/rac_parser.py at main · jeatheak/Mitsubishi-WF-RAC-Integration · GitHub. AFAIR there was some discussion recently about MHI. Can you have a look or recent posts in Best Air Conditioner for OpenHAB integration in 2023?
