First public review of this draft specification - ends September 29th
OASIS and the OASIS Open Command and Control (OpenC2) TC are pleased to announce that Specification for Transfer of OpenC2 Messages via MQTT Version 1.0 is now available for public review and comment. This is the first public review for this specification.
Open Command and Control (OpenC2) is a concise and extensible language to enable the command and control of cyber defense components, subsystems and/or systems in a manner that is agnostic of the underlying products, technologies, transport mechanisms or other aspects of the implementation. Message Queuing Telemetry Transport (MQTT) is a widely-used publish / subscribe (pub/sub) transfer protocol. This specification describes the use of MQTT Version 5.0 as a transfer mechanism for OpenC2 messages.
The documents and related files are available here:
Specification for Transfer of OpenC2 Messages via MQTT Version 1.0
Committee Specification Draft 04
18 August 2021
Editable source (Authoritative):
For your convenience, OASIS provides a complete package of the specification document and any related files in ZIP distribution files. You can download the ZIP file at:
How to Provide Feedback
OASIS and the OpenC2 TC value your feedback. We solicit input from developers, users and others, whether OASIS members or not, for the sake of improving the interoperability and quality of our technical work.
The public review starts 31 August 2021 at 00:00 UTC and ends 29 September 2021 23:59 UTC.
Comments may be submitted to the TC by any person through the use of the OASIS TC Comment Facility, which can be used by following the instructions on the TC’s “Send A Comment” page (https://www.oasis-open.org/committees/comments/index.php?wg_abbrev=openc2).
Comments submitted by TC non-members for this work and for other work of this TC are publicly archived and can be viewed at:
All comments submitted to OASIS are subject to the OASIS Feedback License, which ensures that the feedback you provide carries the same obligations at least as the obligations of the TC members. In connection with this public review, we call your attention to the OASIS IPR Policy  applicable especially  to the work of this technical committee. All members of the TC should be familiar with this document, which may create obligations regarding the disclosure and availability of a member’s patent, copyright, trademark and license rights that read on an approved OASIS specification.
OASIS invites any persons who know of any such claims to disclose these if they may be essential to the implementation of the above specification, so that notice of them may be posted to the notice page for this TC’s work.
Additional information about the specification and the OpenC2 TC can be found at the TC’s public home page:
Additional information related to this public review can be found in the public review metadata document .
 Public review metadata document: