Vehicle.commands.download() timeout when called multiple times on a telemetry link brokered by MAVProxy

When calling Vehicle.commands.download() and Vehicle.commands.wait_ready() repeatedly through MAVProxy, the wait_ready() always fail after a number of trials:

  File "/usr/local/lib/python2.7/dist-packages/dronekit/__init__.py", line 2650, in wait_ready
    return self._vehicle.wait_ready('commands', **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/dronekit/__init__.py", line 2182, in wait_ready
    timeout)
dronekit.APIException: wait_ready experienced a timeout after 30 seconds.

The above error is guaranteed to be thrown when running the following integration test:

https://gist.github.com/tribbloid/13d1bb022c0b681a9ee4a65f1067376e

I don’t know if its a DK issue or MAVProxy issue. So I’ll just submit a failed test to both projects. Please resolve it if DK is not the culprit.

[tizianofiorenzani]

Assuming that your connection string is ok, sometimes you just need to extend the timeout period to get rid of the issue. Here is what I do:

1. vehicle = connect(…, wait_ready=None) --> or do not set wait_ready
2. vehicle.wait_ready(True, timeout=<timeout_in_seconds>)

This will connect with the vehicle and then wait until all the main messages have been received up to timeout_in_seconds

[eminakgun]

#1039 is the implementation here.