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https://issues.apache.org/jira/browse/CAMEL-20754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-20754.
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Resolution: Fixed
> Support MQTT5 Publish Properties in Paho-MQTT5 component
> --------------------------------------------------------
>
> Key: CAMEL-20754
> URL: https://issues.apache.org/jira/browse/CAMEL-20754
> Project: Camel
> Issue Type: New Feature
> Components: camel-paho-mqtt5
> Reporter: Henning Sudbrock
> Priority: Major
> Fix For: 4.7.0
>
>
> Currently, for publishing MQTT5 messages, the camel-paho-mqtt5 supports
> setting the desired topic, QoS, and retained flag. It does not support adding
> the additional publish properties that were introduced with MQTT5. Those
> additional publish properties include, i.a., content type, response topic,
> message expiry interval, and a list of user properties (cf. section 3.3.2.3
> in the [MQTT5
> spec|https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html]).
> These MQTT5-specific properties should be made available as message headers
> in camel-paho-mqtt5 (both for extracting them from incoming MQTT5 messages,
> and for setting them in outgoing MQTT5 messages).
> Technically, the underlying library, Eclipse Paho, supports setting these
> properties (cf.
> [MqttMessage#setProperties|https://github.com/eclipse/paho.mqtt.java/blob/master/org.eclipse.paho.mqttv5.client/src/main/java/org/eclipse/paho/mqttv5/common/MqttMessage.java#L278]),
> but they should be exposed as Camel message headers and, in case of outgoing
> messages, be added to the message passed to Eclipse Paho
> [here|https://github.com/apache/camel/blob/ba4bf712e66e17fd8c47536e9c45564b6637bb99/components/camel-paho-mqtt5/src/main/java/org/apache/camel/component/paho/mqtt5/PahoMqtt5Producer.java#L50-L52].
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