RFD 868x Radio Modem

Hi
First of all, I’m a newbie on AGOpenGPS.
I’ve been using John Deere GPS gear (antennas, displays, steering wheels, ISOBus…) in the last ten years, now I have 3 spare Starfire ITC antennas.
In the last couple of weeks I managed to get a refurbished Surface GO (2018) working with Agopengps and a Starfire ITC antenna. This initial test went well.
Now i need to go further.
My brother has a few gps gear that he uses with is Pixhawk drone, he uses RFD 868x to comuunicate with the drone and send RTK data.
Is it possible to use RFD 868x + Starfire ITC (base station and rover) to get RTK in AGOpenGPS?
How to accomplish it?