I am working on a RPi3b+/Navio2 drone and I would like to activate (from long range) a python script saved on the Pi. I have bi-directional radio telemetry module on the drone and on my laptop and I have Mission Planner set up. I was thinking to use MP’s mission command DO_SET_SERVO on a certain servo rail pin, and then configure that pin to operate as a GPIO (input pin), and have a code (which will always be running) that will listen for PWM input on that pin to initialize a certain python script that is saved on the RPi itself. Is this doable? I am quite new to electronics and such. Thank you very much for your help.