MAVROS offboard mode support

I have a MAVROS running on an Odroid which is connected to QGC via UDP and to the FCU via 3DR radio. I want to know when I change the mode to offboard, a continuous stream of setpoints is being sent to the FCU but who is responsible for sending the setpoints, is it the MAVROS on Odroid or QGroundControl ?
Thank You

mavros is a bridge between px4 and your odroid only. you need to code your own publisher who is publishing your setpoint with five hertz as minimum.