I want to use offboard control, I do not have an odroid or raspberry boards, I am using a ubuntu pc with a long usb cable and I want run the mavros offboard control example code (https://dev.px4.io/en/ros/mavros_offboard.html).
So, I have enable the companion computer interface (SYS_COMPANION TELEM2 to 921600 baudrate).
I am reading this tutorial: http://ardupilot.org/dev/docs/odroid-via-mavlink.html and I am using a USB to Serial interface.
I have a db9 connector and I am connecting Tx , Dx and ground to telem2 pixhawk.
When I run “rosrun mavros mavros_node _fcu_url:=/dev/ttyUSB0:921600”, I can’t start mavros.
What is the problem?
Maybe is my db9?
Do I have to use another interfaces serial ?