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From "ASF subversion and git services (JIRA)" <>
Subject [jira] [Commented] (AMQ-6345) [MQTT] ping response without CONNECT
Date Wed, 06 Jul 2016 16:02:10 GMT


ASF subversion and git services commented on AMQ-6345:

Commit 6dacef1c9552edbad656c31d784179c2cd179b2e in activemq's branch refs/heads/master from
[;h=6dacef1 ]

The MQTT transport will now throw an exception if a PINGREQ is sent to
the broker if a CONNECT packet has not been received first as the spec
says CONNECT must be the first packet sent.

> [MQTT] ping response without CONNECT
> ------------------------------------
>                 Key: AMQ-6345
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: MQTT
>    Affects Versions: 5.13.3
>         Environment: Ubuntu Linux 14.04 
>            Reporter: Martin Tappler
>            Assignee: Christopher L. Shannon
>            Priority: Minor
> I am currently investigating the behavior of several MQTT brokers and noticed that the
ActiveMQ broker responds to PINGREQ packets with PINGRESP packets even if no CONNECT packet
has been sent before. 
> This would be a violation of MQTT-3.1.0-1 and MQTT-4.8.0-1 of MQTT v3.1.1 while MQTT
v3.1 is not that strict about this issue, but does also state "When a TCP/IP socket connection
is established from a client to a server, a protocol level session must be created using a
CONNECT flow." (
> Since ActiveMQ supports MQTT v3.1 according to,
> but also MQTT v3.1.1 according to Issue AMQ-4990, I am not sure whether this should actually
be considered a bug. 

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