Follow mqtt 3.1.1 protocol number 3.3.1-2 : The DUP flag MUST be set to 0 for all QoS 0 messages. If the qos of the publish message is not 0, then set dup to true
Follow mqtt 3.1.1 protocol number 3.3.1-2 : The DUP flag MUST be set to 0 for all QoS 0 messages. If the qos of the publish message is not 0, then set dup to true