Using Homeatic with Home Assistant

I would like to know if there is someone that has some experience with integrating Homeatic into home assistant. I need a couple of devices for managing the heating system in a friends house. On the website they have there own access point for connecting it al together, but after some research I found that it’s possible to purchase a usb dongle to make the Hassio instance the hub for controlling the devices. Is there someone that could explain me how this is working. and what I need to make the systeem free of cloud services and also make it controllable from Homeassistant.