Indoor positioning using DWM1000

Hi All!
I have DWM1000 (pozyx uses the same thing) which sends local position (x,y,z) to Raspberry Pi which is connected by UART to Pixracer (with Copter 3.5.0 firmware). The copter should flight indoor and has no gps signal.
I want to use DroneKit to send position to copter. As I understand “Guided No GPS” mode should be used in this case.
My question is - do I need some additional settings to be able to use guided mode without gps?
And how can I pass position to copter from DroneKit ?
Thanks!