Herelink Tablet Joystick Sending Data


I am analyzing herelink Joystick class. I could not understand how does herelink send data. In the mavlink qgroundcontrol repo, when i was analyzing run function at i was able to send joystick values to rover. However from cubepilot qgroundconrol repo i cannot send joystick values from another tablet and through ethernet cable.

Could you please explain how does joystick values transmitted to rover and how can i drive rover over ethernet?

Thanks in advance