Hi, One way to move forward if you want help from others, is to create an issue here: https://gitlab.com/sane-project/backends/-/issues ... and attach a USB capture trace. It would also provide a permanent record for others to take it on at a later time if you do not take it further.
Or you could send one to me directly and I could take a quick look to see if I recognise it. Cheers, Ralph On Fri, Nov 21, 2025 at 12:55 PM Djordje Dragic <[email protected]> wrote: > Its ScanJet 3770. I'm currently using it with VueScan in Windows on qemu. > > On Fri, Nov 21, 2025 at 7:17 PM Ralph Little <[email protected]> wrote: > >> Hi, >> >> On Thu, Nov 20, 2025 at 10:00 AM Djordje Dragic <[email protected]> >> wrote: >> >>> Can we use usb sniffer to help develop drivers? I got hp scanjet that is >>> unsupported in linux. >>> >> >> Yes, it is possible and commonly how it is done. Firstly, a developer >> would probably want to know if the device uses a protocol that is already >> supported. >> Otherwise, writing a new backend is not very difficult but some knowledge >> of the API is required. Usually, it is easier to take an existing backend >> and modify it to suit, at least I found it so. >> >> Out of interest, which ScanJet do you have? >> >> Cheers, >> Ralph >> >
