CoRE Resource Directory
draft-shelby-core-resource-directory-03
CoRE Z. Shelby
Internet-Draft Sensinode
Intended status: Standards Track S. Krco
Expires: November 18, 2012 Ericsson
May 17, 2012
CoRE Resource Directory
draft-shelby-core-resource-directory-03
Abstract
In many M2M applications, direct discovery of resources is not
practical due to sleeping nodes, disperse networks, or networks where
multicast traffic is inefficient. These problems can be solved by
employing an entity called a Resource Directory (RD), which hosts
descriptions of resources held on other servers, allowing lookups to
be performed for those resources. This document specifies the web
interfaces that a Resource Directory supports in order for web
servers to discover the RD and to register, maintain, lookup and
remove resources descriptions. Furthermore, new link attributes
useful in conjunction with an RD are defined.
Status of this Memo
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This Internet-Draft will expire on November 18, 2012.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Architecture and Use Cases . . . . . . . . . . . . . . . . . . 4
3.1. Use Case: Cellular M2M . . . . . . . . . . . . . . . . . . 5
3.2. Use Case: Home and Building Automation . . . . . . . . . . 6
4. Resource Directory Function Set . . . . . . . . . . . . . . . 6
4.1. Discovery . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2. Registration . . . . . . . . . . . . . . . . . . . . . . . 8
4.3. Update . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.4. Validation . . . . . . . . . . . . . . . . . . . . . . . . 12
4.5. Removal . . . . . . . . . . . . . . . . . . . . . . . . . 13
5. RD Lookup Function Set . . . . . . . . . . . . . . . . . . . . 14
6. New Link-Format Attributes . . . . . . . . . . . . . . . . . . 16
6.1. Export 'exp' attribute . . . . . . . . . . . . . . . . . . 16
7. Security Considerations . . . . . . . . . . . . . . . . . . . 17
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 17
10. Changelog . . . . . . . . . . . . . . . . . . . . . . . . . . 17
11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18
11.1. Normative References . . . . . . . . . . . . . . . . . . . 18
11.2. Informative References . . . . . . . . . . . . . . . . . . 19
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 19
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1. Introduction
The Constrained RESTful Environments (CoRE) working group aims at
realizing the REST architecture in a suitable form for the most
constrained nodes (e.g. 8-bit microcontrollers with limited RAM and
ROM) and networks (e.g. 6LoWPAN). CoRE is aimed at machine-to-
machine (M2M) applications such as smart energy and building
automation.
The discovery of resources offered by a constrained server is very
important in machine-to-machine applications where there are no
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