[jira] [Created] (CAMEL-20754) Support MQTT5 Publish Properties in Paho-MQTT5 component

["Henning Sudbrock (Jira)" <ji...@apache.org>]

Henning Sudbrock created CAMEL-20754:
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             Summary: 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


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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