Henry Vermaak wrote:

You can use some kind of usb snooping software to reverse engineer all
the transfers.  I've used this approach with success.  It's important
for you to familiarise yourself with the usb protocol, though.

The thing one has to be careful of here is when the same pid:vid can refer to several different implementations. The Windows software knows how to pick up a private submodel number, somebody reverse-engineering the transfer doesn't.

Note that there aren't any fpc bindings for libusb 1 (that I know of),
but that should be easy to generate.

http://wiki.lazarus.freepascal.org/Hardware_Access#libusb

--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]

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