[cups] make browsed printers available on workstation commandline

Hi

I am currently working in a lab environment trying to understand
autoconfigure before implementing this in production.

The lab has 3 vlans; print - server - worklab. Printer is a Samsung
CLP-680ND, and server and workstations is running openSUSE 15.2 with
cups-2.2.7

I have successfully setup the server to print, although using the
generic driver I was unable to access some of the printers capabilities,
like duplex. I therefore switched to use the ppd file from Samsung and
everything bow seems to work from the server.

On the server I can print from Firefox, KDE apps, and the commandline
whitout problems. I have kept cups-browsed disabled here, to avoid
double printer registration:

klaus@raagi:~> lpstat -a
a4laser accepting requests since søn 01 aug 2021 15:07:12 CEST
klaus@raagi:~> lpr -P a4laser -o sides=two-sided-long-edge long.txt

produces a double sided printout as I would wish/expect :-)

-----------------
The goal is to share this printer via the server.

So I configured avahi on the server, allowed it trough firewall, added
avahi repeater between server lan on worklab lan on the firewall, and
enabled ipp-client on the workstation.

I can now see avahi picks up the printer on the workstation:
klaus@ituska:~> avahi-browse -rt _ipp._tcp
+  wlan0 IPv4 Samsung CLP-680ND @ raagi                     Internet
Printer     local
=  wlan0 IPv4 Samsung CLP-680ND @ raagi                     Internet
Printer     local
   hostname = [raagi.local]
   address = [172.16.191.8]
   port = [631]
   txt = ["printer-type=0x80105E" "printer-state=4" "Copies=T"
"Duplex=T" "Color=T" "TLS=1.2"
"UUID=83cfee6a-2882-32f6-7771-e157d42a8110"
"pdl=application/octet-stream,application/pdf,application/postscript,image/jpeg,image/png,image/pwg-raster"
"product=(Samsung CLP-680 Series)" "priority=0" "note=Hobbystue"
"adminurl=https://raagi.local.:631/printers/a4laser" "ty=Samsung CLP-680
Series PS" "rp=printers/a4laser" "qtotal=1" "txtvers=1"]

Firefox and Thunderbird also happily picks up the printer, shows status
and is capable of double sided printout as well.

But I am unable to access the printer from the commandline and KDE Apps:

klaus@ituska:~> lpstat -a
lpstat: No destinations added.

Searching for this problem I have seen various howto's using lpadmin to
configuring the printer

sudo lpadmin -p a4laser -v
dnssd://Samsung%20CLP-680ND%20%40%20raagi._ipp._tcp.local/cups?uuid=83....very
long uuid here

but that seems manual, labor intensive and error prone to me. Is it not
possible to have command line printing autoconfigured?

In cups/error_log I see:
E [01/Aug/2021:13:05:11 +0200] [Client 10016] Returning IPP
client-error-bad-request for Create-Printer-Subscriptions (/) from localhost

Does this indicate that cups-browsed is missing some permission to
create the printer it found?

-- 
Regards
Klaus
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