[jira] [Resolved] (ARTEMIS-3781) Send PUBREC on duplicate PUBLISH for MQTT QoS 2

["Justin Bertram (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARTEMIS-3781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Justin Bertram resolved ARTEMIS-3781.
-------------------------------------
    Fix Version/s: 2.22.0
       Resolution: Fixed

> Send PUBREC on duplicate PUBLISH for MQTT QoS 2
> -----------------------------------------------
>
>                 Key: ARTEMIS-3781
>                 URL: https://issues.apache.org/jira/browse/ARTEMIS-3781
>             Project: ActiveMQ Artemis
>          Issue Type: Bug
>            Reporter: Justin Bertram
>            Assignee: Justin Bertram
>            Priority: Major
>             Fix For: 2.22.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> The [MQTT 5|https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901237] (and 3.1.1) specification states:
> bq. Until it has received the corresponding PUBREL packet, the receiver MUST acknowledge any subsequent PUBLISH packet with the same Packet Identifier by sending a PUBREC. It MUST NOT cause duplicate messages to be delivered to any onward recipients in this case [MQTT-4.3.3-10].
> The broker prevents a duplicate message, but it doesn't response with a {{PUBREC}}.



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