The gimbal camera reports what it is doing

InformationRangefinder, optical flow, camera, OSD and other devices

What ArduPilot says:

… get/set … res:N
… recording …
… tracking Lost
… get/set string … res:…
… … started
… tracking ON

Also explained here: 7 more

… … focus
… … unsupported lens
… datetime set …
… … waiting
… … stopped
… tracking searching
… tracking OFF

State lines from a Viewpro, Topotek, Xacti or XFRobot gimbal camera, each naming the brand: recording ON or OFF, object tracking started, stopped, waiting, searching or lost, manual or auto focus, the date and time sent to the camera. In a log they tell you when the recording really started and whether the camera kept its target. “tracking Lost” means the camera no longer sees the object it was following; choose the target again.

The code that sends it

… get/set … res:N

libraries/AP_Mount/AP_Mount_Xacti.cpp AP_Mount_Xacti::handle_param_get_set_response_int() · Open in ArduPilot Copter-4.7.1

… recording …

libraries/AP_Mount/AP_Mount_Topotek.cpp AP_Mount_Topotek::gimbal_record_analyse() · Open in ArduPilot Copter-4.7.1

libraries/AP_Mount/AP_Mount_Viewpro.cpp AP_Mount_Viewpro::process_packet() · Open in ArduPilot Copter-4.7.1

libraries/AP_Mount/AP_Mount_XFRobot.cpp AP_Mount_XFRobot::process_packet() · Open in ArduPilot Copter-4.7.1

… tracking Lost

libraries/AP_Mount/AP_Mount_Viewpro.cpp AP_Mount_Viewpro::process_packet() · Open in ArduPilot Copter-4.7.1

… get/set string … res:…

libraries/AP_Mount/AP_Mount_Xacti.cpp AP_Mount_Xacti::handle_param_get_set_response_string() · Open in ArduPilot Copter-4.7.1

And 9 more messages, sent from the same places.