"Can I ask what you change/edit on mission planner to receive information from the arduino?
At the moment I use the serial monitor on the arduino IDE but it just spits out interpretable info which is unhelpful"
I realise this is 3 years late but I was using your code to work on the same project as yours. To interface pixhawk and arduino uno and programme it to arm/disarm and to make it autonomous at one point.
Unfortunately i wont be able to help as im struggling with the same with but with a pixhawk.
Would it possible for you to send me your code that you used for the interfacing the apm to the arduino? Also are you using the newest version…"