suspend fun MqttEndpoint.publishAwait(topic: String, payload: Buffer, qosLevel: MqttQoS, isDup: Boolean, isRetain: Boolean): Int
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 a packetId
Returncurrent
MQTT client instance *