Anyone integrated into Honeywell Hawk HVAC?

Hi all,

I live in a apartment building with centralised heating and air cooling. I am upgrading from Control4 to home assistant to enjoy the DIY and save the cost.

The C4 is integrated into a Honeywell Hawk control for heating and air con. It seems to be a whole building unit. I can see the username, password and licence code in the C4 settings. Anyone have any experience on how to integrate this to HA without going through the C4, which I want to replace.