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I found that if I set the usb compatibility of the vmware to usb 3.0 (for a ubuntu 18.04), the process for close link will too slow (~20 seconds) compared to the usb2.0 compability (~3 seconds). After tracing the execution of the crazyflie-lib-python, I found it is the close() function for class Crazyradio that takes so long. The self.dev.reset() will take tens of seconds to return. I want to know how to solve this problem.

You can try to remove the div.reset() call. It was mostly done as a precaution and should not be required.

arnaud wrote: ↑Wed Nov 27, 2019 8:26 am You can try to remove the div.reset() call. It was mostly done as a precaution and should not be required.

It doesn't works, if I remove the reset(), the scripts like scan.py or ramp.py will work but I can't flash the firmware. During the flash, it shows the "usb.core ... Resource busy". But I finally find the solution: replace the by , now it works.

That sounds great, thanks for writing back the solution!

I am creating an issue in the lib's github project (https://github.com/bitcraze/crazyflie-l ... issues/130) . If you want to do a pull-request please do! Otherwise, when I have time to look at it I can test and change it myself.