How to trigger camera in a mission using MAVROS

Hi,
I want to trigger camera (AUX5 or AUX6) in one mission when the vehicle reaches the set waypoint. Should I call mavros/cmd/trigger_control services or use ‘mavros/mission/push’ and modify the parameters? I tried the mavros/cmd/trigger_control but there was no voltage output from AUX5 or AUX6.

Hi,
I am looking for the right mavros message to control one of the AUX ports too. Did you find out how to do it?
From my understanding there is no voltage output at the AUX channels you have to supply your servo externally.