Brother scanner not detected

Help
1

I have this printer
Brother MFC-L2710DW series
and it is named by the system Unknown
I want to use it for scanning.
my config has
hardware.sane.enable = true;
and
extraGroups = [ "networkmanager" "wheel" "vboxusers" "scanner" "lp" ];
but simple-scanner says “No Scanners Detected”
My printer is turned on, and connected by ipp://.

CUPS says

Unknown	Unknown		Brother MFC-L2710DW series, using brlaser v6	Idle

I am on unstable branch.

I saw some threads recommending this service
https://search.nixos.org/options?channel=unstable&from=0&size=50&sort=relevance&type=packages&query=hardware.sane.brscan5.netDevices
but I am unsure how to configure it by ipp

config:

# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix
    ];

  hardware.sane.enable = true; # enables support for SANE scanners

  # Bootloader.
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  networking.hostName = "nixos"; # Define your hostname.
  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.

  # Configure network proxy if necessary
  # networking.proxy.default = "http://user:password@proxy:port/";
  # networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";

  # Enable networking
  networking.networkmanager.enable = true;

  # Set your time zone.
  time.timeZone = "Asia/Jerusalem";

  #local time
  time.hardwareClockInLocalTime = true;

  # Select internationalisation properties.
  i18n.defaultLocale = "en_US.UTF-8";

  i18n.extraLocaleSettings = {
    LC_ADDRESS = "en_US.UTF-8";
    LC_IDENTIFICATION = "en_US.UTF-8";
    LC_MEASUREMENT = "en_US.UTF-8";
    LC_MONETARY = "en_US.UTF-8";
    LC_NAME = "en_US.UTF-8";
    LC_NUMERIC = "en_US.UTF-8";
    LC_PAPER = "en_US.UTF-8";
    LC_TELEPHONE = "en_US.UTF-8";
    LC_TIME = "en_US.UTF-8";
  };

  # Enable the X11 windowing system.
  services.xserver.enable = true;

  # Enable the KDE Plasma Desktop Environment.
  services.xserver.displayManager.sddm.enable = true;
  services.xserver.desktopManager.plasma5.enable = true;

  # Configure keymap in X11
  services.xserver = {
   xkb.layout = "us";
    xkb.variant = "";
  };

  # Enable CUPS to print documents.
  services.printing.enable = true;

 #Brother printer
  services.printing.drivers = [
    pkgs.brlaser
    pkgs.brgenml1lpr
    pkgs.brgenml1cupswrapper
];

  # Enable sound with pipewire.
  sound.enable = true;
  hardware.pulseaudio.enable = false;
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    alsa.support32Bit = true;
    pulse.enable = true;
    # If you want to use JACK applications, uncomment this
    #jack.enable = true;

    # use the example session manager (no others are packaged yet so this is enabled by default,
    # no need to redefine it in your config for now)
    #media-session.enable = true;
  };

  # Enable touchpad support (enabled default in most desktopManager).
  # services.xserver.libinput.enable = true;

#NTFS
  boot.supportedFilesystems = [ "ntfs" ];
  
  #Automount      
    
  fileSystems."/run/media/shmuel/Timeshift" = {
       device = "/dev/disk/by-uuid/701FE3AE54D4CE16";
};

fileSystems."/run/media/shmuel/VM" = {
    device = "/dev/disk/by-uuid/f8c56958-b308-4a9c-a8e6-f2ba9a148860";
};

fileSystems."/run/media/shmuel/PersonalData" = {
    device = "/dev/disk/by-uuid/22EC446AEC4439F5";
}; 

  # Define a user account. Don't forget to set a password with ‘passwd’.
  users.users.shmuel = {
    isNormalUser = true;
    description = "shmuel";
    extraGroups = [ "networkmanager" "wheel" "vboxusers" "scanner" "lp" ];
    packages = with pkgs; [
      firefox
      kate
    #  thunderbird
    ];
  };

#Shell
  users.users.shmuel.shell = pkgs.zsh;
  
  #Automatic updates
  system.autoUpgrade.enable  = true;
  system.autoUpgrade.allowReboot  = false;

  # Allow unfree packages
  nixpkgs.config.allowUnfree = true;

  # List packages installed in system profile. To search, run:
  # $ nix search wget
  environment.systemPackages = with pkgs; [
  #  vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
  #  wget
  pkgs.deja-dup
  pkgs.ntfs3g
  pkgs.google-chrome
  pkgs.caffeine-ng
  pkgs.audacious
  pkgs.timeshift
  pkgs.gparted
  pkgs.neofetch
  pkgs.lolcat
  pkgs.conky
  pkgs.goldendict-ng
  pkgs.losslesscut-bin
  pkgs.vlc
  pkgs.smplayer
  pkgs.libreoffice
  pkgs.handbrake
  pkgs.media-downloader
  pkgs.inxi
  pkgs.kio-admin
  pkgs.zram-generator
  pkgs.xfce.mousepad
  pkgs.git
  pkgs.konsave
  pkgs.simple-scan
  ];

  virtualisation.virtualbox.host.enable = true;
  virtualisation.virtualbox.host.enableExtensionPack = true;

  # Some programs need SUID wrappers, can be configured further or are
  # started in user sessions.
  # programs.mtr.enable = true;
    programs.zsh.enable = true;
  # programs.gnupg.agent = {
  #   enable = true;
  #   enableSSHSupport = true;
  # };

  # List services that you want to enable:

  services.flatpak.enable = true;

  # Enable the OpenSSH daemon.
  # services.openssh.enable = true;

  # Open ports in the firewall.
  # networking.firewall.allowedTCPPorts = [ ... ];
  # networking.firewall.allowedUDPPorts = [ ... ];
  # Or disable the firewall altogether.
  # networking.firewall.enable = false;

  # This value determines the NixOS release from which the default
  # settings for stateful data, like file locations and database versions
  # on your system were taken. It‘s perfectly fine and recommended to leave
  # this value at the release version of the first install of this system.
  # Before changing this value read the documentation for this option
  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
  system.stateVersion = "23.11"; # Did you read the comment?

}

# Set channel by running this command:
# sudo nix-channel --add https://channels.nixos.org/nixos-unstable
# sudo nix-channel --update

# Configure printer:
# ipp://192.168.150.170:631
# Brother MFC-L2710DW series, using brlaser v6
2

I tried the following, to no avail:

{
  imports =
    [ # Include the results of the hardware scan.
      <nixpkgs/nixos/modules/services/hardware/sane_extra_backends/brscan4.nix>
      ./hardware-configuration.nix
    ];

  #  hardware.sane.enable = true; # enables support for SANE scanners

brscan4.nix:

{ config, lib, pkgs, ... }:

with lib;

let
  cfg = config.hardware.sane.brscan4;

  netDeviceList = attrValues cfg.netDevices;

  etcFiles = pkgs.callPackage ./brscan4_etc_files.nix { netDevices = netDeviceList; };

  netDeviceOpts = { name, ... }: {

    options = {

      name = mkOption {
        type = types.str;
        description = lib.mdDoc ''
          The friendly name you give to the network device. If undefined,
          the name of attribute will be used.
        '';

        example = "office1";
      };

      model = mkOption {
        type = types.str;
        description = lib.mdDoc ''
          The model of the network device.
        '';

        example = "MFC-7860DW";
      };

      ip = mkOption {
        type = with types; nullOr str;
        default = null;
        description = lib.mdDoc ''
          The ip address of the device. If undefined, you will have to
          provide a nodename.
        '';

        example = "192.168.1.2";
      };

      nodename = mkOption {
        type = with types; nullOr str;
        default = null;
        description = lib.mdDoc ''
          The node name of the device. If undefined, you will have to
          provide an ip.
        '';

        example = "BRW0080927AFBCE";
      };

    };


    config =
      { name = mkDefault name;
      };
  };

in

{
  options = {

    hardware.sane.brscan4.enable = true;
      mkEnableOption (lib.mdDoc "Brother's brscan4 scan backend") // {
      description = lib.mdDoc ''
        When enabled, will automatically register the "brscan4" sane
        backend and bring configuration files to their expected location.
      '';
    };

    hardware.sane.brscan4.netDevices = mkOption {
      default = { model = "MFC-L2710DW"; ipp = "192.168.150.170:631" };
      example =

          office2 = { model = "MFC-7860DW"; nodename = "BRW0080927AFBCE"; };
        };
      type = with types; attrsOf (submodule netDeviceOpts);
      description = lib.mdDoc ''
        The list of network devices that will be registered against the brscan4
        sane backend.
      '';
    };
  };

  config = mkIf (config.hardware.sane.enable && cfg.enable) {

    hardware.sane.extraBackends = [
      pkgs.brscan4
    ];

    environment.etc."opt/brother/scanner/brscan4" =
      { source = "${etcFiles}/etc/opt/brother/scanner/brscan4"; };

    assertions = [
      { assertion = all (x: !(null != x.ip && null != x.nodename)) netDeviceList;
        message = ''
          When describing a network device as part of the attribute list
          `hardware.sane.brscan4.netDevices`, only one of its `ip` or `nodename`
          attribute should be specified, not both!
        '';
      }
    ];

  };
}

This is where I added my printer:

hardware.sane.brscan4.netDevices = mkOption {
      default = { model = "MFC-L2710DW"; ipp = "192.168.150.170:631" };
3

Then I tried both with and without brscan4.nix, after adding this line in my config

hardware.sane.extraBackends = [ pkgs.sane-airscan ];

still no luck

4

make sure avahi-daemon service is running, it’s used to discover devices on the network, it requires port UDP/5353 to be opened as well (but if you enable it through nix config, it should also open the port as well)

5

thank you…