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https://issues.apache.org/jira/browse/ARTEMIS-3781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Clebert Suconic closed ARTEMIS-3781.
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> 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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