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Core Status Pages

Constrained RESTful Environments (Concluded WG)
Art Area: Francesca Palombini, Murray Kucherawy | 2010-Mar-10 —  

2021-07-28 charter

Constrained RESTful Environments (core)


 Current Status: Active

     Jaime Jimenez <jaime@iki.fi>
     Marco Tiloca <marco.tiloca@ri.se>

 Applications and Real-Time Area Directors:
     Murray Kucherawy <superuser@gmail.com>
     Francesca Palombini <francesca.palombini@ericsson.com>

 Applications and Real-Time Area Advisor:
     Francesca Palombini <francesca.palombini@ericsson.com>

 Mailing Lists:
     General Discussion: core@ietf.org
     To Subscribe:       https://www.ietf.org/mailman/listinfo/core
     Archive:            https://mailarchive.ietf.org/arch/browse/core/

Description of Working Group:

  CoRE provides a framework for resource-oriented applications intended to
  run on constrained IP networks. A constrained IP network has limited
  packet sizes, may exhibit a high degree of packet loss, and may have a
  substantial number of devices that may be powered off at any point in
  time but periodically "wake up" for brief periods of time. These
  networks and the nodes within them are characterized by severe limits on
  throughput, available power, and particularly on the complexity that can
  be supported with limited code size and limited RAM per node [RFC 7228].
  More generally, we speak of constrained node networks whenever at least
  some of the nodes and networks involved exhibit these characteristics.
  Low-Power Wireless Personal Area Networks (LoWPANs) are an example of
  this type of network. Constrained networks can occur as part of home and
  building automation, energy management, and the Internet of Things.

  The CoRE working group will define a framework for a limited class of
  applications: those that deal with the manipulation of simple resources
  on constrained networks. This includes applications to monitor simple
  sensors (e.g. temperature sensors, light switches, and power meters), to
  control actuators (e.g. light switches, heating controllers, and door
  locks), and to manage devices.

  The general architecture consists of nodes on the constrained network,
  called Devices, that are responsible for one or more Resources that may
  represent sensors, actuators, combinations of values, and/or other
  information. Devices send messages to change and query resources on
  other Devices. Devices can send notifications about changed resource
  values to Devices that have expressed their interest to receive
  notification about changes. A Device can also publish or be queried
  about its resources. (Typically a single physical host on the network
  would have just one Device but a host might represent multiple logical
  Devices.  The specific terminology to be used here is to be decided by
  the working group.)  As part of the framework for building these
  applications, the working group has defined a Constrained Application
  Protocol (CoAP) for the manipulation of Resources on a Device.

  CoAP is designed for use between Devices on the same constrained
  network, between Devices and general nodes on the Internet, and between
  Devices on different constrained networks both joined by an internet.
  (CoAP is also being used via other mechanisms, such as SMS on mobile
  communication networks.)  CoAP targets the type of operating
  environments defined in the ROLL and 6Lo working groups which have
  additional constraints compared to normal IP networks, but the CoAP
  protocol also operates over traditional IP networks.

  There also may be proxies that interconnect between other Internet
  protocols and the Devices using the CoAP protocol. It is worth noting
  that proxy does not have to occur at the boundary between the
  constrained network and the more general network, but can be deployed at
  various locations in the less-constrained network.

  CoAP supports various forms of "caching".  Beyond the benefits of
  caching already well known from REST, caching can be used to increase
  energy savings of low-power nodes by allowing them to be normally-off
  [RFC 7228].  For example, a temperature sensor might wake up every five
  minutes and send the current temperature to a proxy that has expressed
  interest in notifications; when the proxy receives a request over CoAP
  or HTTP for that temperature resource, it can respond with the last
  notified value (instead of trying to query the Device which may not be
  reachable at this time).  The working group will continue to evolve this
  model to increase its practical applicability.

  The working group will perform maintenance on its first four
  standards-track specifications:
  - RFC 6690
  - RFC 7252
  - RFC 7641
  - draft-ietf-core-block
  and will continue to evolve the experimental group communications
  support (RFC 7390).  The working group will not develop a reliable
  multicast solution.

  CoAP today works over UDP and DTLS.  The working group will define
  transport mappings for alternative transports as required, both IP
  (starting with TCP and a secure version over TLS) and non-IP (e.g., SMS,
  working with the security area on potentially addressing the security gap); this
  includes defining appropriate URI schemes.  Continued compatibility with
  CoAP over SMS as defined in OMA LWM2M will be considered.

  CoRE will continue and complete its work on
  draft-ietf-core-resource-directory, as already partially adopted by OMA
  LWM2M.  Interoperability with DNS-SD (and the work of the dnssd working
  group) will be a primary consideration.  The working group will also
  work on a specification enabling broker-based publish-subscribe-style
  communication over CoAP.

  CoRE will work on related data formats, such as alternative
  representations of RFC 6690 link format and RFC 7390 group communication
  information.  The working group will complete the SenML specification,
  again with consideration to its adoption in OMA LWM2M.

  RFC 7252 defines a basic HTTP mapping for CoAP, with further discussion
  in draft-ietf-core-http-mapping.  This mapping will be evolved and
  supported by further documents.

  Besides continuing to examine operational and manageability aspects of
  the CoAP protocol itself, CoRE will also develop a way to make
  RESTCONF-style management functions available via CoAP that is
  appropriate for constrained node networks.  This will require very close
  coordination with NETCONF and other operations and management working
  groups.  YANG data models will be used for manageability. Note that
  the YANG modeling language is not a target for change in
  this process, though additional mechanisms that support YANG
  modules may be employed in specific cases where significant
  performance gains are both attainable and required.  The working
  group will continue to consider the OMA LWM2M management functions
  as a well-accepted alternative form of management and provide
  support at the CoAP protocol level where required.

  The working group has selected DTLS as the basis for the communications
  security in CoAP.  CoRE will work with the TLS working group on the
  efficiency of this solution.  The preferred cipher suites will evolve in
  cooperation with the TLS working group and CFRG.  The ACE working group
  is expected to provide solutions to authorization that may need
  complementary elements on the CoRE side.  Object security as defined in
  JOSE and being adapted to the constrained node network requirements in
  COSE also may need additions on the CoRE side.

  The working group will coordinate on requirements from many
  organizations and SDO. The working group will closely coordinate with
  other IETF working groups, particularly of the constrained node networks
  cluster (6Lo, 6TiSCH, LWIG, ROLL, ACE, COSE), and appropriate
  groups in the IETF OPS and Security areas.  Work on these subjects, as
  well as on interaction models and design patterns (including follow-up
  work around the CoRE Interfaces draft) may benefit from close
  cooperation with the proposed Thing-to-Thing Research Group.

Goals and Milestones:
  Dec 2017 - Media Types for Sensor Measurement Lists (SenML) submitted to IESG for PS
  Dec 2017 - CBOR Encoding of Data Modeled with YANG submitted to IESG for PS
  Dec 2017 - Object Security for Constrained RESTful Environments (OSCORE)
  Jan 2018 - Management over CoAP submitted to IESG for PS
  Mar 2018 - CoRE Resource Directory submitted to IESG for PS
  Dec 2099 - CoRE Interfaces submitted to IESG
  Done     - Blockwise transfers in CoAP submitted to IESG
  Done     - Best Practices for HTTP-CoAP Mapping Implementation submitted to IESG
  Done     - Representing CoRE Link Collections in JSON submitted to IESG
  Done     - Patch and Fetch Methods for CoAP submitted to IESG for PS
  Done     - WG adoption for Management over CoAP
  Done     - CoAP over TCP, TLS, and WebSockets submitted to IESG for PS

All charter page changes, including changes to draft-list, rfc-list and milestones:

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