Mavlink Android - Manual Control

I am currently trying to create an Android application that connects to a Mavlink-device via a TCP socket and I am albe to arm the drone in the SITL (Mission Planner built in). I have joystick values and mapped them to the needed range of -1000 - +1000 and I send them via the following command:

Do I have to do anything else in order to manually control the drone and how often do I have to send the MANUAL_CONTROL-Command?