[sane-devel] Is there any plan to support Web Devices Services (WDS) protocol?

Steven Santos steven at simplycircus.com
Sat Feb 24 17:08:45 UTC 2018

This is a great project.  If it is successful, you will open up a ton of
scanners for use with SANE

More importantly, it gives a path for supporting just about ANY
windows-only scanner in SANE, as seems windows 10 can export any local
scanner via WSD

I am assuming you found this documentation?


On Tue, Feb 6, 2018 at 11:10 AM, Patrick Roncagliolo <ronca.pat at gmail.com>

> Hi all,
> I found http://ws4d.org/dpws-explorer/ . It has a linux version, it can
> help a bit with device detection and browse properties while developing a
> proper scan software.
> Here <https://sourceforge.net/projects/ws4d-javame/> is a java
> implementation of the DPWS standard, and here
> <http://trac.e-technik.uni-rostock.de/projects/ws4d-gsoap> a C/C++ one.
> However, I found another batch of documentation of the standard, so
> developing a simple working implementation targeted mainly to scan
> capabilities isn't going to be difficult.
> The C/C++ library posted above might be not suitable for sane backend
> implementation, I don't think sane devs would allow adding such a large
> gen-purpose dependency to codebase, and a lightweight implementation is
> better IMHO.
> Il giorno mar 6 feb 2018 alle ore 00:05 Patrick Roncagliolo <
> ronca.pat at gmail.com> ha scritto:
>> Hi,
>> you can find a basic implementation of a WSD discovery scanner here:
>> https://github.com/roncapat/WSD-python
>> Here is a sample output (it detects a response from my MB2350):
>> EndPoint Reference Address:
>> urn:uuid:00000000-0000-1000-8000-f4813944662e
>> Implemented Types:
>> wsdp:Device
>> wprt:PrintDeviceType
>> wscn:ScanDeviceType
>> Transport addresses:
>> Basically, it retrieves an unique identifier, the capabilities of the
>> devices (MB2350 is both printer and scanner), and an HTTP address for later
>> use.
>> More coming. Understanding the protocol with an easy language as Python
>> with no API constraints helps to bootstrap a working implementation, but
>> ideally the next step would be a true backend implementation.
>> Patrick Roncagliolo
>> Il giorno lun 5 feb 2018 alle ore 16:25 Patrick Roncagliolo <
>> ronca.pat at gmail.com> ha scritto:
>>> Hi Till,
>>> WSD came in with Windows Vista IIRC.
>>> It is HTTP/XML based, so yeah, it works only on network, in fact my
>>> canon maxify uses an entirely different protocol on USB (similar, if not
>>> equal, to the BJNP network protocol used by Canon for basic Linux LAN
>>> support).
>>> It defines a discovery protocol, a scan service, a print service, but
>>> probably there are more, unrelated with the printer/multifunction/scanner
>>> world (I started today to dig the docs).
>>> By the way, I managed to fix the script found in the github repo I
>>> linked, and maybe the first step for me to get comfortable with the
>>> protocol will be to play a bit more from python, extending as much as I can
>>> the short script as a more complete CLI tool with discovery support and all
>>> the possible options. Then, I could manage to reimplement the protocol as a
>>> sane backend, which I think is a bit more hard (I need to study sane api
>>> first).
>>> Beware I'm a student with not-so-much spare time, but I'm interested in
>>> learning something new and get my canon working at best, and obviously
>>> contribute as much as I can. I'd like to add or expand wireshark dissectors
>>> for WSD and BJNP too. We'll see how much I can do.
>>> NB. if in the coming days I start a github repo for a WSD python
>>> playground, I'll share here the link.
>>> Here are a few links:
>>> -WS-Discovery (full spec) http://specs.xmlsoap.
>>> org/ws/2005/04/discovery/ws-discovery.pdf
>>> -WS-Print (at the bottom of the page there are links to all print & scan
>>> XML schemas and tech specifications) https://docs.
>>> microsoft.com/en-us/windows-hardware/drivers/print/ws-print-v1-1
>>> -WS-Print 2.0 (only printing? 3d printers? have no time to check)
>>> http://go.microsoft.com/fwlink/p/?LinkId=534008
>>> Il giorno lun 5 feb 2018 alle ore 15:54 Till Kamppeter <
>>> till.kamppeter at gmail.com> ha scritto:
>>>> On 02/05/2018 01:32 PM, Patrick Roncagliolo wrote:
>>>> > WDS is a protocol based on http connection with devices such as
>>>> > scanners, printers and so on. Most of the work is based on a bunch of
>>>> > XML schemas, that are publicly available on MSDN. Searched a lot, but
>>>> > for Linux I only found this (https://github.com/al42and/WSDolefuls),
>>>> > that fails to parse the scanner response, but succeeds to start the
>>>> scan
>>>> > job.
>>>> > I tried to search around SANE for WDS support, but I understood there
>>>> > isn't.
>>>> >
>>>> > Is there a technical motivation behind the lack of support for WDS? or
>>>> > it's just not the top priority? Could it be possible to create a
>>>> backend
>>>> > for this protocol? A lot of Canon printers would work like a charm
>>>> with
>>>> > a single good implementation, and I think it would be the same with a
>>>> > lot of modern hardware. I could try to start a simple implementation
>>>> if
>>>> > someone instructs me with the basics of the SANE internal API for
>>>> > backends and working principles, I'm a student with (not much) free
>>>> time
>>>> > and it could be great to help a bit (and learn something) if possible.
>>>> >
>>>> This looks like a second driverless (meaning no device/model-specific
>>>> software or data (aka driver) required) scanning method after PWG's
>>>> (Printer Working Group, http://www.pwg.org/) IPP Scanning which I
>>>> mentioned in another post on this list.
>>>> It seems that WDS exists already for longer time and is already
>>>> established, so that there are actually several scanners using it. Am I
>>>> right? Which manufacturers are participating? Does it only work on
>>>> network devices? Or only on USB? Does it only work on printer/scanner MF
>>>> devices or also on stand-alone scanners?
>>>> Patrick, it would be great if you could make a SANE module for that.
>>>> Another step to making a scanner as easy to connect under Linux as a USB
>>>> stick. Also great for MF devices which happily print with PWG's
>>>> driverless IPP printing but do not support IPP scanning.
>>>>     Till
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