PWM Camera Trigger

I am currently an undergraduate mechanical engineering student who recently got into developing and have a question about a project I am working on.

Here’s what I have:
• Pixhawk Flight Controller (Px4)
• ODROID C2 (Running Linux Ubuntu 16.04)
• oCam-1MGN-U (Rev. 16 A)

Here’s what I have done:
• Running oCam viewer within Linux
• Set up companion computer (ODROID C2) communication to flight controller (Pixhawk) via MAVLink (note: I did this by following this guide , for what it’s worth, I connected telem2 with an FTDI cable.)

Here’s what I want to do
• Once I plan my drone’s flight via mission planner, I want the flight controller to trigger the camera via PWM signal carrying the metadata such as latitude, longitude, orientation altitude. I then want the companion computer to be able to accept the PWM signal and store sed images with metadata attached.

If there are any resources or tips you all would like to share for developing a code for this all is welcome. If there are any extra questions as far as equipment or anything else just ask and I will be happy to provide.