CoAP Protocol Negotiation
draft-silverajan-core-coap-protocol-negotiation-07

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CoRE Working Group                                         B. Silverajan
Internet-Draft                                                       TUT
Intended status: Informational                                   M. Ocak
Expires: May 3, 2018                                            Ericsson
                                                        October 30, 2017

                       CoAP Protocol Negotiation
           draft-silverajan-core-coap-protocol-negotiation-07

Abstract

   CoAP has been standardised as an application-level REST-based
   protocol.  When multiple transport protocols exist for exchanging
   CoAP resource representations, this document introduces a way forward
   for CoAP endpoints as well as intermediaries to agree upon alternate
   transport and protocol configurations as well as URIs for CoAP
   messaging.  Several mechanisms are proposed: Extending the CoRE
   Resource Directory with new parameter types, introducing a new CoAP
   Option with which clients can interact directly with servers without
   needing the Resource Directory, and finally a new CoRE Link Attribute
   allowing exposing alternate locations on a per-resource basis.

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   Copyright (c) 2017 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
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   (https://trustee.ietf.org/license-info) in effect on the date of

Silverajan & Ocak          Expires May 3, 2018                  [Page 1]
Internet-Draft          CoAP Protocol Negotiation           October 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Aim . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Overcoming Middlebox Issues . . . . . . . . . . . . . . .   4
     2.2.  Better resource caching and serving in proxies  . . . . .   5
   3.  Node Types based on Transport Availability  . . . . . . . . .   6
   4.  New Resource Directory Parameters . . . . . . . . . . . . . .   7
     4.1.  The 'at' RD parameter . . . . . . . . . . . . . . . . . .   7
     4.2.  The 'tt' RD parameter . . . . . . . . . . . . . . . . . .   9
   5.  CoAP Alternative-Transport Option . . . . . . . . . . . . . .   9
   6.  The 'ol' CoRE Link Attribute  . . . . . . . . . . . . . . . .  13
     6.1.  Using /.well-known/core . . . . . . . . . . . . . . . . .  13
     6.2.  Using CoRE Resource Directory . . . . . . . . . . . . . .  14
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  15
     10.2.  Informative References . . . . . . . . . . . . . . . . .  15
   Appendix A.  Change Log . . . . . . . . . . . . . . . . . . . . .  15
     A.1.  From -06 to -07 . . . . . . . . . . . . . . . . . . . . .  15
     A.2.  From -05 to -06 . . . . . . . . . . . . . . . . . . . . .  16
     A.3.  From -04 to -05 . . . . . . . . . . . . . . . . . . . . .  16
     A.4.  From -03 to -04 . . . . . . . . . . . . . . . . . . . . .  16
     A.5.  From -02 to -03 . . . . . . . . . . . . . . . . . . . . .  16
     A.6.  From -01 to -02 . . . . . . . . . . . . . . . . . . . . .  16
     A.7.  From -00 to -01 . . . . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   The Constrained Application Protocol (CoAP) [RFC7252] allows clients,
   origin servers and proxies, to exchange and manipulate resource
   representations using REST-based methods over UDP or DTLS.  CoAP
   messaging is however being extended to use other alternative
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