[Missino Planner] SITL with external waypoints

Hi,

I’ve set up an Arduino to calculate waypoints and send it over to my drone within a MAVLINK-command (TELEM2-port on Pixhawk, Arducopter V3.3). The drone now is controlled by the arduino if the flight mode is set as “GUIDED” via the RC.
Now I want to simulate the correct positions. For this, I want to use the simulation that is implemented in Mission Planner as I can observe the drone’s position on a map.

My question is:

Can I simulate external waypoint commands with the Mission-Planner simulation tool? When I tried it the first time it just used the “Go here”-commands I made with mouse clicks, but no reaction on the Arduino-commands.
If no: Is there another possibility to test this function (Simulate the drones movement on a map by reading the input commands from the arduino)? I don’t want to test it with running hardware as it should not crash into buildings etc. when something fails here…

Thanks and kind regards,

Armin