Hardware is Dell Precision Tower 3000 Series.
>
> down vote
> <>favorite
>
> <https://stackoverflow.com/questions/47087054/pyusb-usb-scanner-read-fails-on-centos-7#>
>
> I'm trying to implement driver mechanism for usb barcode scanner on Centos.
>
> Using PyUSB,
>
> Here is high-level code. I am trying to achieve is to be able to read
> QR-Codes and BarCodes when someone scans and send it to message queue without
> user interaction.
>
> dev = usb.core.find(idVendor=VENDOR_ID, idProduct=PRODUCT_ID)
> if dev.is_kernel_driver_active(0) is True:
> dev.detach_kernel_driver(0)
> dev.set_configuration()
> dev.reset()
> data = dev.read(endpoint.bEndpointAddress, 120,
> timeout=10000)
> currentData = list(chunks(data))
> This code work fine on the same system with Ubuntu operating system. But on
> Centos 7 , All I hear rapid beeps, and nothing read from the scanner.
>
> Here is everything installed on Centos, almost similar to Ubuntu that I ran
> on the same machine.
>
> "libgusb.x86_64 0.2.9-1.el7 @base
> libgusb-devel.x86_64 0.2.9-1.el7 @base
> libusb.x86_64 1:0.1.4-3.el7 @base
> libusb-devel.x86_64 1:0.1.4-3.el7 @base
> libusbmuxd.x86_64 1.0.10-5.el7 @base
> libusbmuxd-devel.x86_64 1.0.10-5.el7 @base
> libusbmuxd-utils.x86_64 1.0.10-5.el7 @base
> libusbx.x86_64 1.0.20-1.el7 @base
> libusbx-devel.x86_64 1.0.20-1.el7 @base
> pyusb.noarch 1.0.0-0.11.b1.el7 @base
> usb_modeswitch.x86_64 2.4.0-5.el7 @base
> usb_modeswitch-data.noarch 20160612-2.el7 @base
> usbmuxd.x86_64 1.1.0-1.el7 @base
> usbredir.x86_64 0.7.1-2.el7 @base
> usbutils.x86_64 007-5.el7 @base"
> Not sure what's the isse.
>
> If I run, bellow block in loop,
>
> print("Waiting to Read")
> data = dev.read(endpoint.bEndpointAddress, 120,
> timeout=10000)
> currentData = list(chunks(data))
> Output is Waiting to read
>
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