当mqttnet服务器不运行时,publishAsync不会失败。

我正在使用.NET库mqtt net,从下面的链接进行基于mqtt的通信。

https://github.com/chkr1011/MQTTnet

我正在使用 managed MQTT Client 从下方链接

https://github.com/chkr1011/MQTTnet/wiki/ManagedClient

我有以下代码 publish 消息发送至 MQTT server .

 var messagePayload = new MqttApplicationMessageBuilder()
                                      .WithTopic("Topic1")
                                      .WithPayload(message)
                                      .WithExactlyOnceQoS()
                                      .WithRetainFlag()
                                      .Build();

    try
    {
          await mqttClient.PublishAsync(messagePayload);                  
    }
    catch (Exception ex)
    {
         //Why I am not getting exception? 
    }