PyUSB timeout fix

[Alex Rodrigues]

A few weeks ago I was having problems connecting to an NXT with PyUSB, libusb-win32 and nxt-python. Only today did I figure out the solution and I thought I would put it here in case anybody ever has the same problem.  The first trick was getting libusb-win32 installed properly. This is explained very well here: http://www.youtube.com/watch?v=1nTaI-N0TCs. (Note, however that you do have to manually copy the files that he moves with install.bat)

Once I got libusb-win32 working, I would get the error:

USBError: [Errno None] libusb0-dll:err [_usb_reap_async] timeout error

In order to fix this I had to go into C:\Python27\Lib\site-packages\usb\legacy.py and on line 150 change:

 def bulkRead(self, endpoint, size, timeout = 100):

to:

 def bulkRead(self, endpoint, size, timeout = 1000):

Increasing the timeout could also probably be done from the nxt-python side. I would reccommend that change as this was a problem on 2 different computers I tried (64-bit win-7 and 64-bit win-8).

Hope this helps somebody,

- Alex