Here is a solution from a company in Germany for one of the Tetracam multispectral cams.
This is a full integration. Autotrigger by programing the missionplanner as usual, GPS, timestamp and IMU fed in to the camera from the H520 FC.
This as a modul to fly the H520 without a camera. It takes over the WIFI bridge for upload of missions and download of telemetry. Works on 2,4GHz and uses the little antenna that is inside the ST16s.
( No video input)