I am trying to use an RPi 3 as my companion computer. I’ve flashed the raspbian image onto the pi, loaded firmware onto the Pixhawk and set up the static IP on my surface computer. I am connected to the pi via ethernet and I have the pixhawk connected via USB, but when I start up QGroundControl, no vehicle connection is detected. I tried testing the MAVproxy as instructed on the troubleshooting page of the Ardusub gitbook, and i got the output shown below.
pi@raspberrypi:~ screen -r mavproxy There is no screen to be resumed matching mavproxy. pi@raspberrypi:~ ~/companion/scripts/start_mavproxy_telem_splitter.sh
Connect /dev/serial/by-id/usb-3D_Robotics_PX4_FMU_v2.x_0-if00,115200 source_system=200
Failed to connect to /dev/serial/by-id/usb-3D_Robotics_PX4_FMU_v2.x_0-if00,115200 : [Errno 2] could not open port /dev/serial/by-id/usb-3D_Robotics_PX4_FMU_v2.x_0-if00: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-3D_Robotics
Are there any additional steps that I need to take in order to make mavproxy work? Any help would be appreciated.