Re: How to use libusb for CDC devices

standard cdc/acm can be associated to default window driver by writing a
simple inf file 
you can start from linux cdc acm gadget .inf from here
https://www.kernel.org/doc/Documentation/usb/linux-cdc-acm.inf

replace the vid/pid (VID_0525&PID_A4A7)  in line below 

[DeviceList]
%DESCRIPTION%=DriverInstall, USB\VID_0525&PID_A4A7,
USB\VID_1D6B&PID_0104&MI_02, USB\VID_1D6B&PID_0106&MI_00

[DeviceList.NTamd64]
%DESCRIPTION%=DriverInstall, USB\VID_0525&PID_A4A7,
USB\VID_1D6B&PID_0104&MI_02, USB\VID_1D6B&PID_0106&MI_00

with yours (you can find them from device manager, driver/device  detail ,
information drop down ids)
you can also change name decription  etc ...  as well 

note that it is common for u-controller serial over usb not to have any 
rts/cts  dtr/dsr etc ...  but just rx/tx lines, 
The usb standards class request for that to be supported are usually empty
and may not return fail on most  device firmware implementation. 




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