Regarding comment #9 "a separated CUPS-Browsing-daemon":

The CUPS Browse Protocol is described at
http://www.cups.org/documentation.php/doc-1.5/spec-browsing.html

What TYPE is can be found in the cups-1.5.3 sources in cups/cups.h
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typedef unsigned cups_ptype_t;          /**** Printer type/capability bits ****/
enum cups_ptype_e                       /**** Printer type/capability bit constants ****/
{                                       /* Not a typedef'd enum so we can OR */
  CUPS_PRINTER_LOCAL = 0x0000,          /* Local printer or class */
  CUPS_PRINTER_CLASS = 0x0001,          /* Printer class */
  CUPS_PRINTER_REMOTE = 0x0002,         /* Remote printer or class */
  CUPS_PRINTER_BW = 0x0004,             /* Can do B&W printing */
  CUPS_PRINTER_COLOR = 0x0008,          /* Can do color printing */
  CUPS_PRINTER_DUPLEX = 0x0010,         /* Can do duplexing */
  CUPS_PRINTER_STAPLE = 0x0020,         /* Can staple output */
  CUPS_PRINTER_COPIES = 0x0040,         /* Can do copies */
  CUPS_PRINTER_COLLATE = 0x0080,        /* Can collage copies */
  CUPS_PRINTER_PUNCH = 0x0100,          /* Can punch output */
  CUPS_PRINTER_COVER = 0x0200,          /* Can cover output */
  CUPS_PRINTER_BIND = 0x0400,           /* Can bind output */
  CUPS_PRINTER_SORT = 0x0800,           /* Can sort output */
  CUPS_PRINTER_SMALL = 0x1000,          /* Can do Letter/Legal/A4 */
  CUPS_PRINTER_MEDIUM = 0x2000,         /* Can do Tabloid/B/C/A3/A2 */
  CUPS_PRINTER_LARGE = 0x4000,          /* Can do D/E/A1/A0 */
  CUPS_PRINTER_VARIABLE = 0x8000,       /* Can do variable sizes */
  CUPS_PRINTER_IMPLICIT = 0x10000,      /* Implicit class */
  CUPS_PRINTER_DEFAULT = 0x20000,       /* Default printer on network */
  CUPS_PRINTER_FAX = 0x40000,           /* Fax queue */
  CUPS_PRINTER_REJECTING = 0x80000,     /* Printer is rejecting jobs */
  CUPS_PRINTER_DELETE = 0x100000,       /* Delete printer @since CUPS 1.2/Mac OS X 10.5@ */
  CUPS_PRINTER_NOT_SHARED = 0x200000,   /* Printer is not shared @since CUPS 1.2/Mac OS X 10.5@ */
  CUPS_PRINTER_AUTHENTICATED = 0x400000,/* Printer requires authentication @since CUPS 1.2/Mac OS X 10.5@ */
  CUPS_PRINTER_COMMANDS = 0x800000,     /* Printer supports maintenance commands @since CUPS 1.2/Mac OS X 10.5@ */
  CUPS_PRINTER_DISCOVERED = 0x1000000,  /* Printer was automatically discovered and added @since CUPS 1.3/Mac OS X 10
.5@ */
  CUPS_PRINTER_SCANNER = 0x2000000,     /* Scanner-only device @since CUPS 1.4/Mac OS X 10.6@ */
  CUPS_PRINTER_MFP = 0x4000000,         /* Printer with scanning capabilities @since CUPS 1.4/Mac OS X 10.6@ */
  CUPS_PRINTER_OPTIONS = 0x6fffc        /* ~(CLASS | REMOTE | IMPLICIT | DEFAULT | FAX | REJECTING | DELETE | NOT_SHA
RED | AUTHENTICATED | COMMANDS | DISCOVERED) @private@ */
};
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What STATE is can be found in the cups-1.5.3 sources in cups/ipp.h
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typedef enum ipp_pstate_e               /**** Printer states ****/
{
  IPP_PRINTER_IDLE = 3,                 /* Printer is idle */
  IPP_PRINTER_PROCESSING,               /* Printer is working */
  IPP_PRINTER_STOPPED                   /* Printer is stopped */
} ipp_pstate_t;
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Accordingly a simple proof-of-concept how to submit CUPS Browsing info
with hardcoded TYPE = CUPS_PRINTER_REMOTE = 0x0002
and hardcoded STATE = IPP_PRINTER_IDLE = 3
to a single remote host is the following bash command
(there is exactly one space between each field):
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echo '2 3 ipp://PRINT.SERVER.IP.ADDRESS:631/printers/QUEUE-NAME "Location" "Description" "Make and Model" lease-duration=300 job-sheets=none,none' >/dev/udp/REMOTE:HOST:IP:ADDRESS/631
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lease-duration=300 means that after 300 seconds the remote host
discards these Browsing info (i.e. it removes the matching entry from
/var/cache/cups/remote.cache (/etc/cups/yes/remote.cache for CUPS < 1.4).