CoRE Resource Directory
draft-ietf-core-resource-directory-26
CoRE C. Amsüss, Ed.
Internet-Draft
Intended status: Standards Track Z. Shelby
Expires: 6 May 2021 ARM
M. Koster
SmartThings
C. Bormann
Universitaet Bremen TZI
P. van der Stok
consultant
2 November 2020
CoRE Resource Directory
draft-ietf-core-resource-directory-26
Abstract
In many IoT applications, direct discovery of resources is not
practical due to sleeping nodes, or networks where multicast traffic
is inefficient. These problems can be solved by employing an entity
called a Resource Directory (RD), which contains information about
resources held on other servers, allowing lookups to be performed for
those resources. The input to an RD is composed of links and the
output is composed of links constructed from the information stored
in the RD. This document specifies the web interfaces that an RD
supports for web servers to discover the RD and to register,
maintain, lookup and remove information on resources. Furthermore,
new target attributes useful in conjunction with an RD are defined.
Note to Readers
Discussion of this document takes place on the CORE Working Group
mailing list (core@ietf.org), which is archived at
https://mailarchive.ietf.org/arch/browse/core/
(https://mailarchive.ietf.org/arch/browse/core/).
Source for this draft and an issue tracker can be found at
https://github.com/core-wg/resource-directory (https://github.com/
core-wg/resource-directory).
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Amsüss, et al. Expires 6 May 2021 [Page 1]
Internet-Draft CoRE Resource Directory November 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Architecture and Use Cases . . . . . . . . . . . . . . . . . 6
3.1. Principles . . . . . . . . . . . . . . . . . . . . . . . 7
3.2. Architecture . . . . . . . . . . . . . . . . . . . . . . 7
3.3. RD Content Model . . . . . . . . . . . . . . . . . . . . 8
3.4. Link-local addresses and zone identifiers . . . . . . . . 12
3.5. Use Case: Cellular M2M . . . . . . . . . . . . . . . . . 12
3.6. Use Case: Home and Building Automation . . . . . . . . . 13
3.7. Use Case: Link Catalogues . . . . . . . . . . . . . . . . 14
4. RD discovery and other interface-independent components . . . 14
4.1. Finding a Resource Directory . . . . . . . . . . . . . . 15
4.1.1. Resource Directory Address Option (RDAO) . . . . . . 17
4.1.2. Using DNS-SD to discover a Resource Directory . . . . 19
4.2. Payload Content Formats . . . . . . . . . . . . . . . . . 19
4.3. URI Discovery . . . . . . . . . . . . . . . . . . . . . . 19
5. Registration . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1. Simple Registration . . . . . . . . . . . . . . . . . . . 27
5.2. Third-party registration . . . . . . . . . . . . . . . . 29
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