[sane-devel] escl backend and ippusbxd
till.kamppeter at gmail.com
Fri Mar 20 11:26:44 GMT 2020
Rolf, please do not add a break dependency against ippusbxd. It is most
probably only some models which cause problems.
If you want to use eSCL via the network it does not matter whether
ippusbxd is running or not. You only need to make sure to select the
correct scanner entry in the client software.
The selected entry should nowhere contain "USB".
Principally eSCL scanning works also via IPP-over-USB, with the device
connected via USB and either ippusbxd or ipp-usb running. ipp-usb is the
more reliable of the two but it is rather new and does not have the wide
penetration in Linux distributions therefore. It is also written in Go
and some OS vendors (like Google with Chrome OS) refuse Go applications
because of there larger memory footprint.
To select scanning through this connection use entries with "USB" in
your scanning client software.
I am able to both print and scan via network and USB and with one of
ippusbxd or ipp-usb permanently running, with both the "escl" and
"airscan" backends. This I have tested on two HP devices, the HP DeskJet
2540 and the HP OfficeJet Pro 8730.
To reach this state I have done a lot of debugging with the authors of
the two SANE backends, Thierry and Alexander. I appreciate their great
collaboration a lot and they will most probably help you, too, if your
device does not work, independent whether you want to use it via network
or USB. Please speak up on the list here or post an issue at the
appropriate backend or IPP-over-USB daemon upstream.
Naturally it can happen that things do not work for one or another
hardware model, it already happens with the two eSCL/AirScan backends
alone. So please report if you have a problem.
On 20/03/2020 12:04, Rolf Bensch wrote:
> I've seen that some people need to purge |ippusbxd| before they can use
> their scanner with escl backend (e.g.
> Is this a fix rule? Then I'd like to add a break dependency to
> |ippusbxd| in my Ubuntu ppa.
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