Multipart Media Type Encoding for CoAP
draft-fossati-core-multipart-ct-00

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Last updated 2012-04-08
Replaced by draft-ietf-core-multipart-ct
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Internet Engineering Task Force                               T. Fossati
Internet-Draft                                                 KoanLogic
Intended status: Standards Track                           April 8, 2012
Expires: October 10, 2012

                 Multipart Media Type Encoding for CoAP
                   draft-fossati-core-multipart-ct-00

Abstract

   This memo defines a new media type encoding that can be used to
   combine several different media types into a single CoAP message-
   body.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on October 10, 2012.

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Fossati                 Expires October 10, 2012                [Page 1]
Internet-Draft   Multipart Media Type Encoding for CoAP       April 2012

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . . . 3
   2.  Multipart Media Type Encoding . . . . . . . . . . . . . . . . . 3
   3.  Length Encoding . . . . . . . . . . . . . . . . . . . . . . . . 3
     3.1.  Short . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     3.2.  Extended  . . . . . . . . . . . . . . . . . . . . . . . . . 4
     3.3.  Constraints . . . . . . . . . . . . . . . . . . . . . . . . 4
     3.4.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . 4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
   6.  Normative References  . . . . . . . . . . . . . . . . . . . . . 5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 5

Fossati                 Expires October 10, 2012                [Page 2]
Internet-Draft   Multipart Media Type Encoding for CoAP       April 2012

1.  Introduction

   This memo defines a new media type encoding that can be used to
   combine several different media types into a single CoAP message-
   body.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

2.  Multipart Media Type Encoding

   Multipart encoding uses multiple adjacent frames each of which
   represents a single media.  Every frame can further be broken in
   three logical pieces: the type of the framed media (T), its length in
   bytes (L), and the media payload itself (V) as depicted in the
   following figure.

             ,------------------ multi part -----------------.
             +------+------+------+     +------+------+------+
             | T[0] | L[0] | V[0] | ... | T[n] | L[n] | V[n] |
             +------+------+------+     +------+------+------+
             `------ part 0 ------'     `------ part n ------'

   The semantics associated to the TLV atoms is as follows:

   T: is one of the numeric media type identifiers defined in the CoAP
      Media Type registry (Section 11.3 of [I-D.ietf-core-coap]), and is
      encoded as a 16-bit uint (Appendix A of [I-D.ietf-core-coap]).

   L: is the lentgh in bytes of the following V frame, and has two
      possible encodings: short or extended (see Section 3).  It
      determines the offset of the next part, or the end of the
      multipart representation when applied to the last frame.

   V: is the media, encoded as implied by the preceeding T field.

3.  Length Encoding

   Two different encodings are defined for the L value: short for parts
   where length(V) measured in bytes is in range [0, 32767]; extended
   for parts with length(V) in range (32767, 2^127-1].
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