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Many USB devices are composite devices that contain multiple interfaces. If such a device has two or more serial ports (comm ports) then they have the same VID, PID and Serial Number. Because of this, it is currently impossible to distinguish between multiple ports on the same USB composite device. It would be nice to be able to differentiate such devices at the USB level. This patch has the device info return the interface number (MI) in addition to the USB VID and PID.
Tested and works on Window and Linux. I think a very similar change could be done to OSX for this to work on a MAC, but I do not have a MAC to test on.
(New pull request but same content as #124 since #124 is from wrong branch and I will close)