NAME

       ipp-usb - Daemon for IPP over USB printer support

DESCRIPTION

       ipp-usb  daemon  enables driver-less printing and scanning on USB-only AirPrint-compatible
       printers and MFPs.

       It works by connecting to the device by USB using IPP-over-USB protocol, and exposing  the
       device to the network, including DNS-SD (ZeroConf) advertising.

       IPP printing, eSCL scanning and web console are fully supported.

SYNOPSIS

   Usage:
       ipp-usb mode [options]

   Modes are:
       standalone
              run forever, automatically discover IPP-over-USB devices and serve them all

       udev   like standalone, but exit when last IPP-over-USB device is disconnected

       debug  logs duplicated on console, -bg option is ignored

       check  check configuration and exit

   Options are
       -bg    run in background (ignored in debug mode)

CONFIGURATION

       ipp-usb searched for its configuration file in two places: 1. /etc/ipp-usb/ipp-usb.conf 2.
       ipp-usb.conf in the directory where executable file is located

       Configuration file syntax is very similar to  .INI  files  syntax.  It  consist  of  named
       sections,  and each section contains a set of named variables. Comments are started from #
       or ; characters and continues until end of line:

           # This is a comment
           [section 1]
           variable 1 = value 1  ; and another comment
           variable 2 = value 2

   Network parameters
       Network parameters are all in the [network] section:

           [network]
             # TCP ports for HTTP will be automatically allocated in the following range
             http-min-port = 60000
             http-max-port = 65535

             # Enable or disable DNS-SD advertisement
             dns-sd = enable      # enable | disable

             # Network interface to use. Set to `all` if you want to expose you
             # printer to the local network. This way you can share your printer
             # with other computers in the network, as well as with iOS and Android
             # devices.
             interface = loopback # all | loopback

             # Enable or disable IPv6
             ipv6 = enable        # enable | disable

   Logging configuration
       Logging parameters are all in the [logging] section:

           [logging]
             # device-log  - what logs are generated per device
             # main-log    - what common logs are generated
             # console-log - what of generated logs goes to console
             #
             # parameter contains a comma-separated list of
             # the following keywords:
             #   error     - error messages
             #   info      - informative messages
             #   debug     - debug messages
             #   trace-ipp, trace-escl, trace-http - very detailed per-protocol traces
             #   all       - all logs
             #   trace-all - alias to all
             #
             # Note, trace-* implies debug, debug implies info, info implies error
             device-log    = all
             main-log      = debug
             console-log   = debug

             # Log rotation parameters:
             #   log-file-size    - max log file before rotation. Use suffix M
             #                      for megabytes or K for kilobytes
             #   log-backup-files - how many backup files to preserve during rotation
             #
             max-file-size    = 256K
             max-backup-files = 5

             # Enable or disable ANSI colors on console
             console-color = enable # enable | disable

   Quirks
       Some devices, due to their firmware bugs, require special handling, called device-specific
       quirks.  ipp-usb loads quirks from the /usr/share/ipp-usb/quirks/*.conf files and from the
       /etc/ipp-usb/quirks/*.conf files. The /etc/ipp-usb/quirks directory is for  system  quirks
       overrides  or admin changes. These files have .INI-file syntax with the content that looks
       like this:

           [HP LaserJet MFP M28-M31]
             http-connection = keep-alive

           [HP OfficeJet Pro 8730]
             http-connection = close

           [HP Inc. HP Laser MFP 135a]
             blacklist = true

           # Default configuration
           [*]
             http-connection = ""

       For each discovered device, its model name is  matched  against  sections  of  the  quirks
       files.    The    section   name   contains   an   exact   model   name,   which   contains
       iManufacturer+iProduct entries from lsusb -v command output, or it may contain  glob-style
       wildcards:  *  that  matches  any  sequence  of characters and ? , that matches any single
       character. To match one of these characters (* and ?) literally, use backslash as escape.

       All matching sections from all quirks files are taken in  consideration,  and  applied  in
       priority order. Priority is computed using the following algorithm:

       ○   When  matching  model  name  against  section  name,  amount  of  non-wildcard matched
           characters is counted, and the longer match wins

       ○   Otherwise, section loaded first wins. Files are loaded in alphabetical order, sections
           read sequentially

       If  some  parameter  exist  in  multiple  sections,  used its value from the most priority
       section

       The following parameters are defined:

       blacklist = true | false
              If true, the matching device is ignored by the ipp-usb

       http-XXX = YYY
              Set XXX header of the HTTP requests forwarded to device to YYY.  If  YYY  is  empty
              string, XXX header is removed

       usb-max-interfaces = N
              Don't use more that N USB interfaces, even if more is available

       In  case  of you found out about your device needs a quirk to work properly or it does not
       work with ipp-usb at all, although it provides IPP-over-USB interface, please  report  the
       isues at https://github.com/OpenPrinting/ipp-usb. The possible quirk for the device can be
       added to the project itself and fix the situation for all device's owners.

FILES

       ○   /etc/ipp-usb/ipp-usb.conf: the daemon configuration file

       ○   /var/log/ipp-usb/main.log: the main log file

       ○   /var/log/ipp-usb/<DEVICE>.log: per-device log files

       ○   /var/ipp-usb/dev/<DEVICE>.state: device state (HTTP port allocation, DNS-SD name)

       ○   /var/ipp-usb/lock/ipp-usb.lock: lock file, that helps to prevent  multiple  copies  of
           daemon to run simultaneously

       ○   /usr/share/ipp-usb/quirks/*.conf: device-specific quirks (see above)

       ○   /etc/ipp-usb/quirks/*.conf: device-specific quirks defined by sysadmin (see above)

COPYRIGHT

       Copyright (c) by Alexander Pevzner (pzz@apevzner.com)
       All rights reserved.

       This program is licensed under 2-Clause BSD license. See LICENSE file for details.

SEE ALSO

       cups(1)

                                            April 2023                                 IPP-USB(8)