Thank you for answer William. The main problem is that I have to test what happen if pixhawk 1 would work and how it would behave with a lot of computational loads. I don’t have hardware for now. But I have to prepared for hardware coming.
I’m sorry, I passed wrong reference, here with hitl for Px4 : HITL Simulation · PX4 Developer Guide. Would it work correct with Px1. Also, for testing I did Gazeebo SITL as defined in “Running ArduSub SITL with Gazebo” article. But I install gazeboo 9. I have the same problem as described in Setting up a simulation environment - #31 by griz. Would it work with hitl in such scenario?