I am using dronekit-python in a docker container and am attempting to connect to an instance of MAVProxy running on my host machine (Mac OSX) using the following command:
vehicle = connect('udp:host.docker.internal:14551', wait_ready=True)
but am getting the following error:
File "/usr/local/lib/python3.7/site-packages/pymavlink/mavutil.py", line 1015, in __init__
self.port.bind((a[0], int(a[1])))
OSError: [Errno 99] Cannot assign requested address
Does anyone know what the issue is here? I am able to successfully connect using the above command when I run the python script locally on host but not when I have it running in a docker container.
I found a similar stackoverflow question here but the accepted answer did not work for me. Not sure if I need to be exposing ports or something like that.
Here is the command that I am running on my host machine to kick off MAVProxy:
mavproxy.py --master=127.0.0.1:14550 --out udp:127.0.0.1:14551 --out udp:10.55.222.120:14550 --out udp:127.0.0.1:14552
I ended up getting MAVProxy on host and dronekit-python in the docker flask container properly connected.
Seemus790's answer in this gitter thread did the trick.
Working solution: MAVProxy on host machine (Mac OS in my case)
mavproxy.py --master=127.0.0.1:14550 --out udp:127.0.0.1:14551 --out udp:10.55.222.120:14550 --out=tcpin:0.0.0.0:14552
dronekit-python command in docker container:
vehicle = connect('tcp:host.docker.internal:14552', wait_ready=True)
The trick was the --out=tcpin:0.0.0.0:14552 part of the mavproxy command which is documented here