====== CUPS ======

====== Cups webinterface ======
[[http://localhost:631/]]

By default it uses normal system users and their passwords (root for admin).
By default CUPS **@SYSTEM** group is mapped to system **lpadmin** group, so user should be added into **lpadmin** group.

To create internal CUPS users:
<code bash>
lppaswd -g lpadmin -a username
</code>
and file **/etc/cups/passwd.md5** will be created/updated

For more permissions look into **/etc/cups/cupsd.conf**

====== cups-pdf ======

<file | /etc/cups/cups-pdf.conf>
LogType 7
</file>

Error: "failed to set file mode"
Issue not related to apparmor (not enabled).

Solution:
  Error is generated by cups-pdf but is relative to ghostscript rights. Ghostscript seems to need full rights in its temp work dir.
  Setting "GSTmp /tmp" instead of "GSTmp /var/tmp" in /etc/cups/cups-pdf.conf solves the problem for me.


====== Brother DCP-7055W ======

<code bash>
lpadmin -p DCP7055W -v lpd://192.168.179.1/binary_p1 -E -P /usr/share/cups/model/brother-DCP-7055W-cups-en.ppd
</code>


====== Samsung ML-1640 ======
<code bash>
apt-get install splix
</code>
In printer settings, add new network printer. Choose Samsung and ML-1640 model.
Device URI:
 <code>socket://192.168.1.3:9100</code>

======  HP LaserJet Pro MFP M127fw ======

<code bash>sudo apt-get install hplip-gui</code>

New GUI application ''HPLIP Toolbox'' will be installed. 
  * Run app and add network printer using network discovery.
  * Let download plugin from Hp server

===== Network scanner =====

<code bash>
sudo apt-get install sane-utils
sudo apt-get install snmp-mibs-downloader
</code>

<file | /etc/default/saned>
RUN=yes
</file>

<file | /etc/sane.d/saned.conf>
192.168.0.0/22
</file>

<code bash>service saned restart</code>
<code>
Failed to restart saned.service: Unit saned.service is masked.
</code>
Which is correct when systemd is used. Saned service is activated by ''saned.socket'' on TCP:6566
<code bash>systemctl enable saned.socket</code>

Enable proper backend in /etc/sane.d/dll.conf

<code bash>
scanimage -L
scanimage > test.ppm
</code>

Problem is that remote saned clients has to known ''hpaio'' driver to use it. 
So it is not possible to use it on Android.

<code>
Options specific to device `hpaio:/net/HP_LaserJet_Pro_MFP_M127fw?ip=192.168.1.107':
  Scan mode:
    --mode Lineart|Gray|Color [Lineart]
        Selects the scan mode (e.g., lineart, monochrome, or color).
    --resolution 75|100|150|200|300|600|1200dpi [75]
        Sets the resolution of the scanned image.
    --source Flatbed|ADF [Flatbed]
        Selects the scan source (such as a document-feeder).
  Advanced:
    --brightness -1000..1000 [0]
        Controls the brightness of the acquired image.
    --contrast -1000..1000 [0]
        Controls the contrast of the acquired image.
    --compression None|JPEG [JPEG]
        Selects the scanner compression method for faster scans, possibly at
        the expense of image quality.
    --jpeg-quality 0..100 [inactive]
        Sets the scanner JPEG compression factor. Larger numbers mean better
        compression, and smaller numbers mean better image quality.
  Geometry:
    -l 0..215.9mm [0]
        Top-left x position of scan area.
    -t 0..296.926mm [0]
        Top-left y position of scan area.
    -x 0..215.9mm [215.9]
        Width of scan-area.
    -y 0..296.926mm [296.926]
        Height of scan-area.

</code>

==== Issue: unable to load library libm.so  ====
Not possible to scan. Every software which is using ''sane'' timeouts with:
<code>
/hp-scan: common/utils.c 188: unable to load library libm.so: /usr/lib/x86_64-linux-gnu/libm.so: invalid ELF header
xsane: io/hpmud/jd.c 678: timeout read_channel sec=45 hp:/net/HP_LaserJet_Pro_MFP_M127fw?ip=192.168.1.107
xsane: http.c 189: timeout reading data sec_timeout=45
error: SANE: Error during device I/O (code=9)
</code>

===== Sane web frontends =====
[[http://www.sane-project.org/sane-frontends.html]]
  * [[https://github.com/sbs20/scanserv]]
    * NodeJS based [[https://github.com/sbs20/scanservjs]]
  * [[https://sourceforge.net/projects/phpsane/]]
    * requires <code bash>apt-get install php-zip</code>
  * [[https://sourceforge.net/projects/sanewi/]]