CoAP over GATT (Bluetooth Low Energy Generic Attributes)
draft-amsuess-core-coap-over-gatt-01

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CoRE                                                           C. Amsüss
Internet-Draft                                           2 November 2020
Intended status: Experimental                                           
Expires: 6 May 2021

        CoAP over GATT (Bluetooth Low Energy Generic Attributes)
                  draft-amsuess-core-coap-over-gatt-01

Abstract

   Interaction from computers and cell phones to constrained devices is
   limited by the different network technologies used, and by the
   available APIs.  This document describes a transport for the
   Constrained Application Protocol (CoAP) that uses Bluetooth GATT
   (Generic Attribute Profile) and its use cases.

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://gitlab.com/chrysn/coap-over-gatt/ (https://gitlab.com/chrysn/
   coap-over-gatt/-/tree/master).

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
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   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 6 May 2021.

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Copyright Notice

   Copyright (c) 2020 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 the Trust Legal Provisions and are
   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Procedural status . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Appplication example  . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Protocol description  . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Requests and responses  . . . . . . . . . . . . . . . . .   4
     3.2.  Addresses . . . . . . . . . . . . . . . . . . . . . . . .   5
       3.2.1.  Scheme-free alternative . . . . . . . . . . . . . . .   5
     3.3.  Compression and reinterpretation of non-CoAP
           characteristics . . . . . . . . . . . . . . . . . . . . .   6
   4.  IANA considerations . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Uniform Resource Identifier (URI) Schemes . . . . . . . .   6
   5.  Security considerations . . . . . . . . . . . . . . . . . . .   6
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Appendix A.  Change log . . . . . . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   The Constrained Application Protocol (CoAP) [RFC7252] can be used
   with different network and transport technologies, for example UDP on
   6LoWPAN networks.

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   Not all those network technologies are available at end user devices
   in the vicinity of the constrained devices, which inhibits direct
   communication and necessitates the use of gateway devices or cloud
   services.  In particular, 6LoWPAN is not available at all in typical
   end user devices, and while 6LoWPAN-over-BLE (IPSP, the Internet
   Protocol Support Profile of Bluetooth Low Energy (BLE), [RFC7668])
   might be compatible from a radio point of view, many operating
   systems or platforms lack support for it, especially in a user-
   accessible way.

   As a workaround to access constrained CoAP devices from end user
   devices, this document describes a way encapsulate generic CoAP