open fun publish(topic: String, payload: Buffer, qosLevel: MqttQoS, isDup: Boolean, isRetain: Boolean): MqttClient
Sends the PUBLISH message to the remote MQTT server
topic - topic on which the message is published
isDup - if the message is a duplicate
isRetain - if the message needs to be retained
Return
current MQTT client instance
open fun publish(topic: String, payload: Buffer, qosLevel: MqttQoS, isDup: Boolean, isRetain: Boolean, publishSentHandler: Handler<AsyncResult<Int>>): MqttClient
Sends the PUBLISH message to the remote MQTT server
topic - topic on which the message is published
isDup - if the message is a duplicate
isRetain - if the message needs to be retained
publishSentHandler - handler called after PUBLISH packet sent with packetid (not when QoS 0)
Return
current MQTT client instance