How to setup multi throttle control over network (UDP) for HIL simulation with QGroundControl (PX4)

Question

I am trying to get a network connection between X-PLane 11 and QGroundControl with a connected Pixhawk controller to perform a Hardware In the Loop simulation (HIL) to setup the right parameters in the Pixhawk controller.

My simulated plane has 4 engines which I want to control independently from QGroundControl.

So far I only got a UDP connection between x-Plane and QGroundControl which controls all 4 engines with the same input value.

Which network parameters / simulation parameters allow the independent control of all 4 or even 6 engines?

Thanks a lot for some hints.

Best

Sven