How to set `libusb_transfer.flags`

[WeiminWangKolmostar]

First, thanks for your awesome work.

I noticed that libusb doesn't provide an api to set the flag member of libusb_transfer, and python-libusb1 doesn't expose the libusb_transfer's members (code).

So is there a way to set libusb_transfer.flags in python-libusb1.

[WeiminWangKolmostar]

Update: I found python-libusb1 does set libusb_transfer's members (see here)

So the following code can be used to set the libusb_transfer.flags:

transfer = usb_device_handle.getTransfer()
transfer._USBTransfer__transfer.contents.flags = 1  # LIBUSB_TRANSFER_SHORT_NOT_OK

[WeiminWangKolmostar]

Add a PR to provide a method to do this.