[sane-devel] Canon I-Sensys MF4780w "push mode" scanning

[Alexander Lyashuk]

Thanks for the suggestion, but I actually don't have any windows machine
that I can use for that.

I only started windows in a virtualbox to observe the network traffic
between it and the scanner.
(and also I reboot my laptop to windows sometimes, mentioning that just to
explain why I used "windows machines" in plural in my previous message)

If you suggest that the scanner itself would upload documents via SMB,
unfortunately MF4780w is quite old and doesn't support that, as well as
other convenient options like scanning to email, so unless I'm missing
something I'm stuck with using either MFNP or WSD.

On Sun, Aug 15, 2021 at 7:36 PM Jörn-Ingo Weigert <jiweigert at gmail.com>
wrote:

> Just a guess without having that scanner model:
>
> You should be able to use your desired mode, when you share a folder on
> windows and set  both access and security to "everyone" in the properties
> of the shared folder.
>
> In the settings of your scanner you should enable "SMB" protocol too.
>
> Hope that help you
>
> Alexander Lyashuk <mooskagh at gmail.com> schrieb am So., 15. Aug. 2021,
> 12:31:
>
>> One more thing to add, maybe WSD will be an easier option.
>>
>> It's possible to enable WSD support for this scanner.
>>
>> In that case, I also can scan in "Remote scanner" mode through the
>> sane-airscan backend.
>> I can also start scanning to the windows machines from the scanner
>> through WSD (when I select "Scan" -> "Computer", all windows machines in my
>> local network appear, even ones without Canon drivers, unlike it was with
>> MFNP-only mode).
>>
>> However, when I do `scanimage --device-name=airscan:w0:mf4780w -A`
>> similarly to what I attempted with MFNP mode, no new lines appear in the
>> list of destinations.
>> Also `scanimage -A` doesn't show the state of buttons in this case.
>>
>>
>> On Sun, Aug 15, 2021 at 11:43 AM Alexander Lyashuk <mooskagh at gmail.com>
>> wrote:
>>
>>> Hi sane-devel,
>>>
>>> I have a Canon i-Sensys MF4780w network scanner/printer.
>>>
>>> It has two ways to start scanning:
>>> - "Remote scanner" / "pull mode", when you enable that mode on the
>>> device and then continue on the computer.
>>> - "Computer" / "push mode", where you select the destination and
>>> initiate scanning from the scanner itself.
>>>
>>> My scanner works well in "Remote scanner" mode (through the pixma
>>> backend, I've added "mfnp://10.162.0.7" to pixma.conf).
>>> I'd like to be able to initiate the scans from the scanner (in
>>> "Computer"/push mode) though, so that I can set up a headless server which
>>> will upload documents to Google Drive.
>>>
>>> So far I failed to set it up that way, and I wonder whether there is any
>>> hope.
>>>
>>> When I select "Scan" -> "Computer" on my scanner,
>>> - First I have to select the destination.
>>> - Then I select the mode (Color/BnW/Custom1/Custom2).
>>>
>>> I checked what Windows does to appear in the list of destinations, and
>>> it seems that it sends an MFNP message to the scanner every 5 seconds and
>>> so.
>>>
>>> I tried to do the same from Linux by calling `scanimage -A` in the loop.
>>> When I did that, a selectable extra empty line indeed appeared in the list
>>> of destinations on the scanner. I checked the messages from Windows and
>>> Linux in network sniffer and it appears that Windows sends the hostname in
>>> ASCII format, while on Linux it's UTF-16, that's the likely reason why the
>>> scanner cannot display the destination name properly.
>>> I wouldn't mind having an empty line as a hostname though as long as it
>>> would work.
>>>
>>> When I select "Scan" -> "Computer" -> "empty line" -> "Custom 1" (or
>>> BnW/Custom2/Color), both --button-1 and --button-2 still show value [0] in
>>> `scanimage -A`, so I cannot find any way to know I should start scanning.
>>>
>>> I also tried to use scanbd, but it appears not to be able to find the
>>> scanner at all:
>>>
>>> [root]# SANE_CONFIG_DIR=/usr/local/etc/scanbd/ ./scanbd -f -d7
>>> ./scanbd: reading config file /usr/local/etc/scanbd/scanbd.conf
>>> ./scanbd: debug on: level: 7
>>> ./scanbd: dropping privs to uid root
>>> ./scanbd: dropping privs to gid scanner
>>> ./scanbd: drop privileges to gid: 96
>>> ./scanbd: Running as effective gid 96
>>> ./scanbd: drop privileges to uid: 0
>>> ./scanbd: Running as effective uid 0
>>> ./scanbd: dbus_init
>>> ./scanbd: dbus match
>>> type='signal',interface='org.freedesktop.Hal.Manager'
>>> ./scanbd: SANE_CONFIG_DIR=/usr/local/etc/scanbd/
>>> ./scanbd: sane version 1.0
>>> ./scanbd: Scanning for local-only devices
>>> ./scanbd: start_sane_threads
>>> ./scanbd: no devices, not starting any polling thread
>>> ./scanbd: start dbus thread
>>> ./scanbd: Not Primary Owner (-1)
>>> ./scanbd: Name Error (Connection ":1.219" is not allowed to own the
>>> service "de.kmux.scanbd.server" due to security policies in the
>>> configuration file)
>>> ./scanbd: udev init
>>> ./scanbd: get udev monitor
>>> ./scanbd: udev fd is non-blocking, now setting to blocking mode
>>> ./scanbd: start udev thread
>>> ./scanbd: udev thread started
>>>
>>> Note the string "Scanning for local-only devices", does it mean it
>>> doesn't attempt to scan network devices?
>>>
>>> Any suggestions on what to try next would be very appreciated.
>>>
>>> Thanks!
>>>
>>>
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