Re: CUPS - how to match autodetected printers to physical ones
On Mon 11 Apr 2022, at 19:23, Brian <ad44@cityscape.co.uk> wrote:
> On Mon 11 Apr 2022 at 13:55:03 -0400, Greg Wooledge wrote:
>
>> On Mon, Apr 11, 2022 at 06:47:59PM +0100, Brian wrote:
>> > BTW. I am interested in how using /usr/lib/cups/backend/snmp went.
>> > Its drawback is that not all printers provide an snmp service.
>>
>> wooledg:~$ /usr/lib/cups/backend/snmp
>> network socket://10.76.172.120 "HP LaserJet 4250" "hp LaserJet 4250" "MFG:Hewlett-Packard;CMD:PJL,MLC,PCLXL,PCL,PJL,POSTSCRIPT;1284.4DL:4d,4e,1;MDL:hp LaserJet 4250;CLS:PRINTER;DES:Hewlett-Packard LaserJet 4250;" "W01-0224"
>> network socket://10.76.172.88 "HP LaserJet 4100 Series" "HP LaserJet 4100 Series" "MFG:Hewlett-Packard;CMD:PJL,MLC,PCL,POSTSCRIPT,PCLXL,PJL;MDL:HP LaserJet 4100 Series ;CLS:PRINTER;DES:Hewlett-Packard LaserJet 4100 Series;" ""
>> network socket://10.76.173.60:9100 "HP LaserJet P3010 Series" "HP LaserJet P3010 Series" "MFG:Hewlett-Packard;CMD:PJL,BIDI-ECP,PJL,POSTSCRIPT,PDF,PCLXL,PCL;MDL:HP LaserJet P3010 Series;CLS:PRINTER;DES:Hewlett-Packard LaserJet P3010 Series;" ""
>>
>> Looks like that doesn't contain anything for the Canon printers.
>
> Although used by other vendors, a socket://... URI is really an HP
> thing, used by JetDirect appliances, so not surprising. Anyway, this
> very useful info of yours would prompt me to discard advising the use
> of snmp to match IP address with printer model. We are back to
> avahi-browse.
>
> I appreciate you print to that printer infrequently but would suggest a
> manually set up queue may suit you.
>
> Execute
>
> driverless
>
> to get its URI. (I am sure you can sort out which one it is).
>
> Then
>
> lpadmin -p SENSIBLE_PRINTER_NAME -L MYOFFICE -v URI -E -m everywhere
>
> --
> Brian.
I've been searching for documentation on CUPS "implicitclass" but can't find much.
I did find this:
'CUPS can automatically merge multiple identical network printers into "implicit classes". This allows clients to send jobs to the implicit class and have them print on the first available printer or server.' [though the doc predates CUPS driverless printing by some margin]
https://www.cups.org/test/testfile.pdf (p4)
The above is similar (though possibly quite different) to
https://opensource.apple.com/source/cups/cups-87/doc/sam.shtml#PRINTER_CLASSES
(2nd para under 'The Basics')
Assuming implicitclass is the mechanism of first resort in auto-detection (my own setup suggests so), does anyone know if this means that, with multiple devices of the same type, there's no guarantee from which device printing from the same queue will emerge, or are implicit classes resulting from auto-detection implemented as implicit classes of one?
Thanks,
Gareth
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