I am having the same issue. I cannot make the Dronekit connect.
It is not a hardware problem for sure. There are very few tutorials on Navio2 available, and when you find something, they are not clear enough and miss some steps.
I have the Navio2 with everything updated. I can connect the mission control app and also my RC normally. The only thing I can’t make work is the connection with dronekit to run python scripts.
And this is the mavproxy.py command line:
mavproxy.py --master 127.0.0.1:5760 --out 127.0.0.1:14550 --out 127.0.0.1:14551
Can you please help?