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Specification for Transfer of OpenC2 Messages via MQTT v1.0 from OpenC2 TC approved as a Committee Specification

"Transfer via MQTT" is ready for testing and implementation

OASIS is pleased to announce that Specification for Transfer of OpenC2 Messages via MQTT Version 1.0 from the OASIS Open Command and Control (OpenC2) TC [1] has been approved as an OASIS Committee 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.

This Committee Specification is an OASIS deliverable, completed and approved by the TC and fully ready for testing and implementation.

The prose specifications and related files are available here:

Specification for Transfer of OpenC2 Messages via MQTT Version 1.0
Committee Specification 01
19 November 2021

Editable source: (Authoritative)

Details of non-material changes since the previous public review are redlined in:

Distribution ZIP file

For your convenience, OASIS provides a complete package of the prose specification and related files in a ZIP distribution file. You can download the ZIP file here:

Members of the OpenC2 TC [1] approved this specification by Special Majority Vote. The specification had been released for public review as required by the TC Process [2]. The vote to approve as a Committee Specification passed [3], and the document is now available online in the OASIS Library as referenced above.

Our congratulations to the TC on achieving this milestone and our thanks to the reviewers who provided feedback on the specification drafts to help improve the quality of the work.

Additional references

[1] OASIS Open Command and Control (OpenC2) TC

[2] Public review and comment resolution timeline:
– Most recent comment resolution log:

[3] Approval ballot: