When I connected me to MQTT server with the MQTTKit for IOS (https://github.com/jmesnil/MQTTKit), I received the last message published but I don't want it
How can I do ?
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That message was published with the Retained bit set to true.
This flag tells the broker to deliver the last message on a give topic with this bit set to be sent to any client that subscribes to that topic.
You can clear the message by sending an empty (null) message to the same topic with the retained bit set.
HiveMQ have a article which explains in more details: http://www.hivemq.com/mqtt-essentials-part-8-retained-messages/