public ushort Publish(
MqttConnection connection,
string topic,
byte[] message,
byte qosLevel,
bool retain)
{
var publish = new MqttMsgPublish(topic, message, false, qosLevel, retain);
publish.MessageId = connection.GetMessageId();
// enqueue message to publish into the inflight queue
EnqueueInflight(connection, publish, MqttMsgFlow.ToPublish);
return(publish.MessageId);
}