RESTful Design for Internet of Things Systems
draft-irtf-t2trg-rest-iot-02
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Network Working Group A. Keranen
Internet-Draft Ericsson
Intended status: Informational M. Kovatsch
Expires: April 26, 2019 Siemens AG
K. Hartke
Ericsson
October 23, 2018
RESTful Design for Internet of Things Systems
draft-irtf-t2trg-rest-iot-02
Abstract
This document gives guidance for designing Internet of Things (IoT)
systems that follow the principles of the Representational State
Transfer (REST) architectural style. This document is a product of
the IRTF Thing-to-Thing Research Group (T2TRG).
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
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on April 26, 2019.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
Keranen, et al. Expires April 26, 2019 [Page 1]
Internet-Draft RESTful Design for IoT Systems October 2018
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1. Architecture . . . . . . . . . . . . . . . . . . . . . . 6
3.2. System design . . . . . . . . . . . . . . . . . . . . . . 8
3.3. Uniform Resource Identifiers (URIs) . . . . . . . . . . . 9
3.4. Representations . . . . . . . . . . . . . . . . . . . . . 10
3.5. HTTP/CoAP Methods . . . . . . . . . . . . . . . . . . . . 11
3.5.1. GET . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5.2. POST . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5.3. PUT . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5.4. DELETE . . . . . . . . . . . . . . . . . . . . . . . 13
3.5.5. FETCH . . . . . . . . . . . . . . . . . . . . . . . . 13
3.5.6. PATCH . . . . . . . . . . . . . . . . . . . . . . . . 13
3.6. HTTP/CoAP Status/Response Codes . . . . . . . . . . . . . 13
4. REST Constraints . . . . . . . . . . . . . . . . . . . . . . 14
4.1. Client-Server . . . . . . . . . . . . . . . . . . . . . . 14
4.2. Stateless . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3. Cache . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4. Uniform Interface . . . . . . . . . . . . . . . . . . . . 16
4.5. Layered System . . . . . . . . . . . . . . . . . . . . . 17
4.6. Code-on-Demand . . . . . . . . . . . . . . . . . . . . . 17
5. Hypermedia-driven Applications . . . . . . . . . . . . . . . 18
5.1. Motivation . . . . . . . . . . . . . . . . . . . . . . . 18
5.2. Knowledge . . . . . . . . . . . . . . . . . . . . . . . . 19
5.3. Interaction . . . . . . . . . . . . . . . . . . . . . . . 19
5.4. Hypermedia-driven Design Guidance . . . . . . . . . . . . 20
6. Design Patterns . . . . . . . . . . . . . . . . . . . . . . . 20
6.1. Collections . . . . . . . . . . . . . . . . . . . . . . . 20
6.2. Calling a Procedure . . . . . . . . . . . . . . . . . . . 21
6.2.1. Instantly Returning Procedures . . . . . . . . . . . 21
6.2.2. Long-running Procedures . . . . . . . . . . . . . . . 21
6.2.3. Conversion . . . . . . . . . . . . . . . . . . . . . 22
6.2.4. Events as State . . . . . . . . . . . . . . . . . . . 22
6.3. Server Push . . . . . . . . . . . . . . . . . . . . . . . 23
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