Unable to find wireless printer/scanner (Canon Pixma MG2950) on Guix.

[Luigi Salamone]

Hi!

My Canon Pixma MG2950 works fine on Parabola, after configuring avahi with
nss-mdns. But on Guix I can't find neither the printer nor the scanner.
Tried with "system-config-printer" and via "lpinfo". What can I do? Here
the salient lines of my /etc/config.scm:

...
(use-package-modules cups scanner)
....

 (packages (append (list (specification->package "cups")
                         (specification->package "cups-filters")
                         (specification->package "cups-filters")
                         (specification->package "cups-pk-helper")
                         (specification->package "foomatic-filters")
                         (specification->package "ghostscript")
                         (specification->package "sane-backends")
                         (specification->package "simple-scan")
                         (specification->package "nss-mdns")
                         (specification->package "avahi")
....
(services
  (const* (service cups-service-type
                    (cups-configuration
                      (extensions
                        (list cups-filters foomatic-filters hplip))
                      (web-interface? #t)
                      (default-paper-size "A4")))
     (modify-services %desktop-services
                        (sane-service-type _ =>
                                           sane-backends)

Thanks!

Luigi