Publish-Subscribe Broker for the Constrained Application Protocol (CoAP)

Document Type Expired Internet-Draft (core WG)
Authors Michael Koster  , Ari Keränen  , Jaime Jimenez 
Last updated 2020-09-10 (latest revision 2019-09-30)
Replaces draft-koster-core-coap-pubsub
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state WG Document
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The Constrained Application Protocol (CoAP), and related extensions are intended to support machine-to-machine communication in systems where one or more nodes are resource constrained, in particular for low power wireless sensor networks. This document defines a publish- subscribe Broker for CoAP that extends the capabilities of CoAP for supporting nodes with long breaks in connectivity and/or up-time. There is work in progress to resolve some of the transfer layer issues by using a more RESTful approach. Please see


Michael Koster (
Ari Keränen (
Jaime Jimenez (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)