Service Location Working Group Mikael Pahmp
INTERNET DRAFT Axis Communications
2 December 1998
Definition of printer:raw-tcp: URLs for use with Service Location
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This document defines the raw-tcp 'printer:raw-tcp' service type which and the
attributes associated with it. It is a concrete service type of the
abstract printer service type defined in .
This template is designed to be used in conjuction with  for the Service Location Protocol, version
Procotocol, Version 2 defined in .
Status of This Memo i
1. Introduction 1
2. Raw TCP printing 1
2.1. Service Attributes. . . . . . . . . . . . . . . . . . . . 1
3. Printer Service Template 2
A. References 3
Service Type templates are used to describe in a standard way those
services which use the service: URL. The template described in this
document extends the abstract service type described in , called
printer, with another concrete printer service type, called raw-tcp.
2. Raw TCP printing
Printing using TCP for transparent communication between a client
and a print service is common today. How print data, status,
messages, etc is formatted when exchanged across the TCP connection
varies. It is up to the printing client to determine how data should
be formatted and interpreted. This may be determined based on the
information available in the service attributes.
For example, a client without any prior configuration may
use the 'ieee-1284-device-id' attribute, described below, to select a
printer driver for the advertised printer. The client can then let
the printer driver communicate transparently with the printer service
by opening a TCP connection to the host and port indicated by the
2.1. Service Attributes
Attributes of the Raw TCP printing raw-tcp print service includes those defined
in . The following additional semantics applies.
The 'concrete-protocols' attribute value should always be 'tcp'.
The 'abstract-protocols' attribute is optional in  and should
not be advertised with the Raw TCP printing service since data
exchanged across the TCP connection isn't defined by the service.
A a new optional attribute 'device-id' is 'ieee-1284-device-id' defined for the Raw TCP
in this service template. This attribute is the Device ID string
of the advertised printer as defined in IEEE 1284  which may be used to uniqely identify a printer and
match it with a software driver on the printing client. .
3. Printer 'printer:raw-tcp' Service Template
The service template defined below, conforms to the grammar
described in "Service Templates and service: Schemes". Please refer
to  for detailed explaination of the syntax.
Name of submitter: Mikael Pahmp <Mikael.Pahmp@axis.com>
Language of service template: en
This service neither adds nor detracts from the security of the
opaque raw-tcp data stream itself. The service could be used to obfuscate
or lie about See also the service endpoint's characteristics if SLP
authentication blocks are not used. security
considerations of the 'printer:' template .
-------------------------template begins here-----------------------
template-type = printer:raw-tcp
template-version = 0.1
The printer:raw-tcp: URL describes a transparent bidirectional
communication channel for printing. Print data, status, messages,
etc is written or read by opening a TCP connection to the port in
the service URL. How data is formatted and sent across the
connection is decided by the printing client and the print printer
service and is not defined in by this document. template.
url-path = ippurl / lprurl / raw-tcp-url
concrete-protocols = STRING L M
# The names of the concrete protocol types supported
# by This template adds 'raw-tcp-url' to the printer abstract service type. Example values
# include http url-path
; definition in .
; 'ippurl' and lpr.
# Is always 'tcp' for this concrete service.
abstract-protocol 'lprurl' as defined in .
raw-tcp-url = STRING L O
# "raw-tcp://" hostport
; raw-tcp URLs don't have a path section.
hostport = host ":" port
; raw-tcp doesn't have a well-known port assigned by
; IANA. The name of the abstract protocol which may be run over
# any concrete types listed. For example, the abstract
# protocol 'ipp' may be run over the concrete types of http
# or 'mailto'.
# Should not port must therefor be advertised with this concrete service.
device-id= specified in all
; raw-tcp URLs.
; 'host' and 'port' as defined in .
ieee-1284-device-id = STRING L O
# The Device ID string of this printer as defined in IEEE 1284 
# which uniqely identifies
# a the printer type and model. type, model, etc.
--------------------------template ends here------------------------
Note: The 'concrete-protocols' and 'abstract-protocol' attributes is
defined in  but is given a more narrow definition here when used
with the Raw TCP printing service. The 'device-id' attribute is a new
attribute defined for this concrete service type.
 St. Pierre, P., Isaccson., S. Isaccson. and I. McDonald,
"Definition of printer: URLs for use with Service Location", Work
<draft-ietf-svrloc-printer-scheme-03.txt> (work in Progress, March 1998.
 Guttman, C. E., Perkins, C., Veizades, J. Veizades and M. Day. Day, "Service
Location Protocol, Protocol Version 2", Work in Progress, November 1998. RFC 2608, June 1999.
 "IEEE Std.1284-1994 Standard Signaling Method for a
Bi-directional Parallel Peripheral Interface for Personal
 Guttman, C. E., Perkins, C. and J. Kempf, "Service Templates and
service: Schemes", Work in Progress, November, 1998 RFC 2609, June 1999.
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