First, plug flight controller into your computer, and go onto QGroundControl.
Params to Set:
In order to connect the VOXL2 to an external FCU, you will need to set the baudrate of the telemetry connection to 921600. You can use TELEM1 or TELEM2 for this. I chose to use TELEM2.
So I set SERIAL2_BAUD to 921600
You can find this under Vehicle Setup -> Parameters
Connect VOXL2 to Cube:
Connections:
VOXL2 ESC UART (J18):
You will need to connect from the 4 pin UART ESC on the VOXL2 to TELEM2 on the Cube