ipp-usb: Unable to add printer Ricoh with IPP-over-USB

Printer is Ricoh SP 377SFNwx. Using openSUSE Leap 15.4, installed from scratch (no upgrade).

As network printer, with URI ipp:// and driver “everywhere”, seemingly no problems until now.

Wanted to try with IPP-over-USB. So connected printer via USB, and tried “lpinfo -v”. There was this found URI “direct usb://UNKNOWN/Printer[…]”. Did internet search and found that an additional daemon was needed: https://github.com/OpenPrinting/ipp-usb So manually downloaded the RPM package and installed. Now shown URI was “direct usb://RICOH/SP[…]” (cannot remember it exactly)

So tried adding it, and got:

# lpadmin -p <a_name> -Ev usb://RICOH/SP[...] -m everywhere; echo $?
lpadmin: Unable to connect to "RICOH:0": Name or service not known
1

Tried several things: —Double-checking that firewalld was -temporarily- disabled (otherwise “lpinfo -v” wouldn’t even have worked) —Trying URI ipp://RICOH/SP[…] instead —Trying the “lsusb” advice here https://wiki.debian.org/CUPSDriverlessPrinting#IPP-over-USB:_The_Basics ; and I did get the right output like there says, so printer does have support for this

Could someone help please? Thanks for your attention.