How to change the MQTT messages format?

Hello,
the KURA MQTT cloud client publishes messages respecting the following formula:
#account-name/#client-id/#API-ID/topic
I want to send MQTT messages with my own format, I dont want to send the account name and the client id in the MQTT message
how can I do that?
I already tried to change the configuration in the KURA web interface -> MQTTData transport and I have deleted the content of "lwt.topic" but without success.
Thanks in advance for your help!

The following link is an iot-based Greenhouse Application Prototype:
https://github.com/kartben/kura-greenhouse-demo/blob/master/org.eclipse.iot.greenhouse.publisher/src/main/java/org/eclipse/iot/greenhouse/publisher/GreenhousePublisher.java
Here, you can see the proper usage of DataService and DataServiceListener to communicate with the Message Broker.
For, further reading, go through the following links:
http://download.eclipse.org/kura/releases/1.2.0/docs/apidocs/org/eclipse/kura/data/DataService.html
http://download.eclipse.org/kura/releases/1.2.0/docs/apidocs/org/eclipse/kura/data/DataServiceListener.html
Thanks

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