Hi there,
After some experimentation a couple of weeks ago...
libusb_claim_interface() grants exclusive access to the USB device and blocks any more instances until the first has
released the interface. However if a second instance calls libusb_detach_kernel_driver() beforehand then
libusb_claim_interface() will grant access. This has likely just broken the first instance.
Don't call libusb_detach_kernel_interface() regardless; if you really need to detach a kernel driver then you can
unbind it by doing this sort of thing:
echo "3-3:1.0" > /sys/module/usbserial/holders/ftdi_sio/drivers/usb:ftdi_sio/unbind
Cheers, Steve
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