I would like to test a real antenna tracker, driven by a Pixhawk and the antenna tracker firmware, which is setup "in the middle" : on one side the antenna tracker is linked via 3DR radio to the vehicle, on the other side, it is linked to a PC running Mission planner with a second radio link.
(thus not in a configuration where mission planner is in the middle).
I am running SITL on Windows on a PC to simulate a quadcopter; so far so good.
But I can't find a way to make SITL send the quadcopter's mavlink to the COM port where the 3DR radio is connected to establish the link to the Pixhawk's telemetry port on the real antenna tracker.
(I have read the wiki in detail for SITL & Mavproxy, nothing found. The Mavproxy "ouput add" command does not work to forward a mavlink ouput to a COM port; it only works for UDP which is not a solution in my case)
So I need some help from the community. Has anyone done that succesfully and if yes, how ?