Hi everyone,
we are making an underwater vehicle as a team. I use jetson nano, pixhawk. We want to arm and start the vehicle engines, but we got some errors like that “disconnected or multiple access on port”
how can we fix that?
we use codes on Pymavlink · GitBook
Hi @duygucatkin, welcome to the forum 
What other code/programs are you running on your Jetson Nano?
In particular, are you trying to connect to the same port from multiple connections / could there be something else that’s also trying to use the port your pymavlink script is connecting to?
Hi Eliot Thank you for replying me
Actually we thought about that ,.I guess ,as you say problem is trying to connect to the same port from multiple connections but I couldnt find them,what are these connections,I dont know we just using one companion computer and topside computer.We use pymavlink and Q Ground Control,
Also when we write codes showing the ports at ubuntu terminal,we see many IP address and port…