修改mqtt心跳时间

MqttSubscriber.cpp

@@ -80,7 +80,7 @@ void MqttSubscriber::start() {
     
     
     // 设置连接选项
     // 设置连接选项
     MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
     MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
-    conn_opts.keepAliveInterval = 20;
+    conn_opts.keepAliveInterval = 35;
     conn_opts.cleansession = 1;
     conn_opts.cleansession = 1;
     
     
     QByteArray bUsername = config.username.toUtf8();
     QByteArray bUsername = config.username.toUtf8();
@@ -165,7 +165,7 @@ void MqttSubscriber::onSubscribeFailure(MQTTAsync_failureData* response) {
 }
 }
 
 
 void MqttSubscriber::connectionLost(char* cause) {
 void MqttSubscriber::connectionLost(char* cause) {
-    qInfo() << "连接丢失";
+    qInfo() << "连接丢失"<<cause;
     if (cause) {
     if (cause) {
         qInfo() << "Cause:" << cause;
         qInfo() << "Cause:" << cause;
     }
     }