==== Network Printing CUPS ====

825gen2 has CUPS (Common Unix Printing System)

lpinfo does show it

{{{
card825gen2:/mnt/nfs/arm825_nand/bin$ /usr/sbin/lpinfo -v
network socket
network lpd
network ipp
network http
direct usb://SANEI/SK1-311%20Presenter%20(STR-001)
network dnssd://Canon%20TX-3000._ipp._tcp.local/?uuid=00000000-0000-1000-8000-001832104e5a
network dnssd://Canon%20iPR%20Svr%20G250%20V2.1%20US(64%3A59%3AA5)._printer._tcp.local/
network dnssd://HP%20Designjet%20T520%2024in%20%5BD50233%5D._ipp._tcp.local/?uuid=abcd9e8e-4886-85c2-2167-b143d1c2344a
network dnssd://HP%20LaserJet%20P2055dn%20%5B82FCF4%5D._pdl-datastream._tcp.local/
network dnssd://Lexmark%20C2240._ipp._tcp.local/?uuid=584bdd81-d230-49f3-a210-d39ac56492d0
}}}

To just show any dnssd printers

{{{
card825gen2:/mnt/nfs/arm825_nand/bin$ /usr/sbin/lpinfo --include-schemes dnssd -v
}}}

Many network printers support a protocol known as Bonjour. Bonjour is a combination of zero-configuration networking ("ZeroConf"), multicast DNS (mDNS), and DNS service discovery (DNS-SD) standards published by the Internet Engineering Task Force (IETF), the same group that defined TCP/IP and all of the networking we use today.

A printer that supports Bonjour can be found automatically using the dnssd backend. Run the lpinfo(8) command to find your printer's URI: