QMqttClient客户端，pub消息后，其他客户端收不到，其他客户端只能收到Will Message

 if(m_mqttclient == NULL)

        {

            m_mqttclient = new QMqttClient();

        }



        if (m_mqttclient->state() == QMqttClient::Disconnected)

        {

            m_mqttclient->setHostname(centerip);

            m_mqttclient->setPort(1883);

            m_mqttclient->setUsername("front");

            m_mqttclient->setPassword("front");

            m_mqttclient->setClientId("we_are_gantry_front");

            m_mqttclient->setProtocolVersion(QMqttClient::MQTT_3_1);

            m_mqttclient->setKeepAlive(120);

            m_mqttclient->setCleanSession(1);



            m_mqttclient->setWillMessage("goodbye gantry");

            m_mqttclient->setWillTopic("11/22/33");

            m_mqttclient->setWillQoS(2);

            m_mqttclient->setWillRetain(true);



            m_mqttclient->connectToHost();

            qDebug()<<centerip<<"mqtt connect";

        }

        if(m_mqttclient->state() == QMqttClient::Connected)

        {

            QString publish_topic=QString("%1/%2).arg(province_id).arg(ii);

            int publish_code = m_mqttclient->publish(publish_topic,msg.toUtf8(),2,true);

            qDebug()<<publish_topic<<msg<<publish_code;

        }else{

            qDebug()<<centerip<<"mqtt not connect";

        }