Re: [libusb] DOMException: Failed to execute 'controlTransferIn' on 'USBDevice': A transfer error has occurred.

[<jo...@be...>]

Hi,

>The above Wiki has a link to the following blog post which talks about the difficulties
> in enumerating the devices using web applications.
>https://web.dev/articles/porting-libusb-to-webusb#using-the-port

Thanks. After some more debug, I think the problem relates to the value of MAX_CTRL_BUFFER_LENGTH in emscripten_webusb.cpp. It's currently 4096. There's a comment that says transfers may fail if this is too big - and reducing it to 255 seems to enable the code to work on Windows.

>If that does not help, please create a new issue in libusb github.
>https://github.com/libusb/libusb/issues

Have added: https://github.com/libusb/libusb/issues/1493 with some more details.

Cheers,
Jon