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MQTT Version 3.1.1 Errata 01

OASIS Approved Errata

10 December 2015

Specification URIs

This version: (Authoritative)

Previous version: (Authoritative)

Latest version: (Authoritative)

Technical Committee:

OASIS Message Queuing Telemetry Transport (MQTT) TC


Raphael J Cohn (, Individual

Richard J Coppen (, IBM


Andrew Banks (, IBM

Rahul Gupta (, IBM

Additional artifacts:

This prose specification is one component of a Work Product that also includes:

·         MQTT Version 3.1.1 Plus Errata 01. Edited by Andrew Banks and Rahul Gupta. 10 December 2015. OASIS Standard Incorporating Approved Errata 01.

Related work:

This specification is related to:

·         MQTT and the NIST Cybersecurity Framework Version 1.0. Edited by Geoff Brown and Louis-Philippe Lamoureux. Latest version:


This document lists errata for MQTT Version 3.1.1.


This document was last revised or approved by the OASIS Message Queuing Telemetry Transport (MQTT) TC on the above date. The level of approval is also listed above. Check the “Latest version” location noted above for possible later revisions of this document. Any other numbered Versions and other technical work produced by the Technical Committee (TC) are listed at

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MQTT Version 3.1.1 Errata 01. Edited by Andrew Banks and Rahul Gupta. 10 December 2015. OASIS Approved Errata. Latest version:



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Table of Contents

1        Introduction. 5

1.1 Terminology. 5

1.2 Normative References. 5

2        Approved Errata. 6

2.1 Remaining length range check. 6

3        Conformance. 7

Appendix A. Acknowledgments. 8

Appendix B. Revision History. 10



1      Introduction

This document lists the approved errata to the MQTT V3.1.1 OASIS Standard.

Each one is listed as a subsection of Approved Errata (Section 2), in order of their insertion.

As required by the OASIS Technical Committee Process, the approved errata represent changes that are not “substantive”.


Text to be removed from or added to the original specification is marked as follows:



The text to be removed.



Text to be added.



1.1 Terminology

The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in this document are to be interpreted as described in [RFC2119].

1.2 Normative References

[RFC2119]               Bradner, S., “Key words for use in RFCs to Indicate Requirement Levels”, BCP 14, RFC 2119, March 1997.

[MQTT311]              MQTT Version 3.1.1. Edited by Andrew Banks and Rahul Gupta. 29 October 2014. OASIS Standard.

2      Approved Errata

The following are approved errata to the OASIS MQTT Version 3.1.1 standard and its related works.

2.1 Remaining length range check.

The pseudocode in section 2.2.3 of the MQTT V3.1.1 specification [MQTT311], does not correctly detect a fixed header remaining length greater than 2,097,151 bytes. To correct the pseudocode move the range check so that it precedes the multiplier update.


multiplier = 1

value = 0


     encodedByte = 'next byte from stream'

     value += (encodedByte AND 127) * multiplier

     multiplier *= 128

     if (multiplier > 128*128*128)

        throw Error(Malformed Remaining Length)

while ((encodedByte AND 128) != 0)




multiplier = 1

value = 0


     encodedByte = 'next byte from stream'

     value += (encodedByte AND 127) * multiplier

     if (multiplier > 128*128*128)

        throw Error(Malformed Remaining Length)

     multiplier *= 128

while ((encodedByte AND 128) != 0)

3      Conformance

No changes to conformance.

Appendix A. Acknowledgments

The following individuals have participated in the creation of these errata and are gratefully acknowledged:


·         Sanjay Aiyagari (VMware, Inc.)

·         Ben Bakowski (IBM)

·         Andrew Banks (IBM)

·         Arthur Barr (IBM)

·         William Bathurst (Machine-to-Machine Intelligence (M2MI) Corporation)

·         Ken Borgendale (IBM)

·         Geoff Brown (Machine-to-Machine Intelligence (M2MI) Corporation)

·         James Butler (Cimetrics Inc.)

·         Marco Carrer (Eurotech S.p.A.)

·         Raphael Cohn (Individual)

·         Sarah Cooper (Machine-to-Machine Intelligence (M2MI) Corporation)

·         Richard Coppen (IBM)

·         AJ Dalola (Telit Communications S.p.A.)

·         Mark Darbyshire (TIBCO Software Inc.)

·         Scott deDeugd  (IBM)

·         Paul Duffy (Cisco Systems)

·         Phili DesAutels (LogMeIn Inc.)

·         John Fallows (Kaazing)

·         Pradeep Fernando (WSO2)

·         Paul Fremantle (WSO2)

·         Thomas Glover (Cognizant Technology Solutions)

·         Rahul Gupta (IBM)

·         Steve Huston (Individual)

·         Wes Johnson (Eurotech S.p.A.)

·         Christopher Kelley (Cisco Systems)

·         David Kemper (TIBCO Software Inc.)

·         James Kirkland (Red Hat)

·         Alex Kritikos (Software AG, Inc.)

·         Louis-P. Lamoureux (Machine-to-Machine Intelligence (M2MI) Corporation)

·         David Locke (IBM)

·         Shawn McAllister (Solace Systems)

·         Dale Moberg (Axway Software)

·         Manu Namboodiri (Machine-to-Machine Intelligence (M2MI) Corporation)

·         Peter Niblett (IBM)

·         Arlen Nipper (Individual)

·         Julien Niset (Machine-to-Machine Intelligence (M2MI) Corporation)

·         Mark Nixon (Emerson Process Management)

·         Nicholas O'Leary (IBM)

·         Sandor Palfy (LogMeIn Inc.)

·         Dominik Obermaier (dc-square GmbH)

·         Pavan Reddy (Cisco Systems)

·         Andrew Schofield (IBM)

·         Wadih Shaib (BlackBerry)

·         Ian Skerrett (Eclipse Foundation)

·         Joe Speed (IBM)

·         Allan Stockdill-Mander (IBM)

·         Gary Stuebing (Cisco Systems)

·         Steve Upton (IBM)

·         James Wert jr. (Telit Communications S.p.A.)

·         T. Wyatt (Individual)

·         SHAWN XIE (Machine-to-Machine Intelligence (M2MI) Corporation)

·         Dominik Zajac (dc-square GmbH)

·         Ed Briggs, Microsoft

Appendix B. Revision History




Changes Made


26 August 2015

Andrew Banks, Rahul Gupta

Initial Version.

Add errata 1, remaining length range check.