Re: [pyusb-users] Input/Output error when trying to follow tutorial

[Sergio A. Q. <ser...@gm...>]

thank you Tormod, the usb sniffer actually provided me with enough
information of what i needed. i was trying to configure the device through
the usb port, but what i'm getting from the IN endpoint is quite enough.


On Tue, Jan 8, 2019 at 1:32 PM Tormod Volden <lis...@gm...> wrote:

> On Tue, Jan 8, 2019 at 8:26 PM Sergio A. Quiroga wrote:
> >
> > my device is a thermometer, it came with a software, and i can take
> readings with the application included. however i'm trying to include it to
> a python scripted environment, and need to take readings directly from the
> thermometer.
> >
> > anyway, i can find the device, set the configuration, and identify the
> endpoints of it. but when i try to send the 'test' message (or any message,
> whatsoever), i keep getting 'Input/output error' from the libusb1.py script.
>
> Hi Sergio,
>
> Often an OUT endpoint used for requests is not a text stream where you
> will send text commands, but is rather expecting some structured
> command packet. And maybe you just need to read the IN endpoint to
> start with. Anyway, if the USB protocol is not documented, you can use
> a USB sniffer to see what the delivered (presumably closed source)
> software is doing.
>
> Regards,
> Tormod
>
>
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-- 
SQ