I have tried using HITL gazebo without ROS on ubuntu but it seems there is no connection between my hardware and the simulation (or QGC). The are no errors printed at all, but after gazebo opens, there is not response from the pixhawk and there is no response after opening QGC. I am using px4_fmu-v3 and I have followed the HITL SImulation instructions.
I can use SITL gazebo though, so I really don’t know what could be the problem. Is there anything I should look at for possible errors?