ugrpquadcopter
commented
2 years ago 
We are having difficulties in the HILS process.
Attitude Control Expert is running.
We are using Pixhawk 4 and proceeded with the method introduced in the book.
I tried to upload firmware to PX4Upload and HILS using Coptersim, but the following message popped up. I gave him an order with a controller, but he didn't move.
Can you tell me how to solve this problem?