mqtt断线重连,配置修改重新创建连接07

MqttSubscriber.cpp

 #include "MqttSubscriber.h"
 #include "mainwindow.h"
 #include "CameraHandle.h"
+#include "HttpService.h"  // 确保包含 HttpService 头文件
+#include <QTimer>
 
 MqttSubscriber* MqttSubscriber::instance = nullptr;
 
@@ -12,10 +14,20 @@ MqttSubscriber* MqttSubscriber::getInstance(QObject* parent) {
 }
 
 void MqttSubscriber::init(vides_data::MqttConfig &config, QString &httpUrl, QString &serialNumber) {
-    // 清理之前的客户端资源
+    // 如果客户端已存在，先断开连接再销毁
     if (client != nullptr) {
-        MQTTAsync_destroy(&client);  // 释放之前的MQTT客户端
-        client = nullptr;  // 确保指针清空
+        if (MQTTAsync_isConnected(client)) {
+            // 断开连接
+            MQTTAsync_disconnectOptions disc_opts = MQTTAsync_disconnectOptions_initializer;
+            int rc = MQTTAsync_disconnect(client, &disc_opts);
+            if (rc != MQTTASYNC_SUCCESS) {
+                qInfo() << "客户端断开连接失败，返回编码" << rc;
+            }
+        }
+
+        // 销毁现有的MQTT客户端
+        MQTTAsync_destroy(&client);
+        client = nullptr;  // 重置客户端指针
     }
 
     // 保存配置信息
@@ -23,13 +35,19 @@ void MqttSubscriber::init(vides_data::MqttConfig &config, QString &httpUrl, QStr
     this->httpUrl = httpUrl;
     this->serialNumber = serialNumber;
 
-    // 初始化MQTT客户端
+    // 初始化新的MQTT客户端
     QByteArray bAddress = config.address.toUtf8();
     char* cAddress = bAddress.data();
     QByteArray bClientId = config.clientId.toUtf8();
     char* cClientId = bClientId.data();
 
-    MQTTAsync_create(&client, cAddress, cClientId, MQTTCLIENT_PERSISTENCE_NONE, nullptr);
+    int rc = MQTTAsync_create(&client, cAddress, cClientId, MQTTCLIENT_PERSISTENCE_NONE, nullptr);
+    if (rc != MQTTASYNC_SUCCESS) {
+        qInfo() << "MQTT客户端创建失败，返回编码" << rc;
+        return;
+    }
+
+    // 设置回调函数
     MQTTAsync_setCallbacks(client, this, [](void* context, char* cause) {
         static_cast<MqttSubscriber*>(context)->connectionLost(cause);
     }, [](void* context, char* topicName, int topicLen, MQTTAsync_message* m) {
@@ -38,7 +56,7 @@ void MqttSubscriber::init(vides_data::MqttConfig &config, QString &httpUrl, QStr
 }
 
 MqttSubscriber::MqttSubscriber(QObject* parent)
-    : QObject(parent), retryTimer(new QTimer(this)) {
+    : QObject(parent), retryTimer(new QTimer(this)), client(nullptr) {
 
     // 连接信号和槽
     connect(this, &MqttSubscriber::connectionLostSignal, this, &MqttSubscriber::reconnectAndFetchConfig, Qt::QueuedConnection);
@@ -56,18 +74,10 @@ MqttSubscriber::~MqttSubscriber() {
 }
 
 void MqttSubscriber::start() {
-    // 确保每次开始连接前停止定时器
+    // 确保定时器停止
     retryTimer->stop();
 
-    // 如果客户端已经连接，应该先断开旧的连接
-    if (client != nullptr) {
-        MQTTAsync_disconnectOptions disc_opts = MQTTAsync_disconnectOptions_initializer;
-        int rc = MQTTAsync_disconnect(client, &disc_opts);
-        if (rc != MQTTASYNC_SUCCESS) {
-            qInfo() << "旧连接断开失败，返回编码" << rc;
-        }
-    }
-
+    // 设置连接选项
     MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
     conn_opts.keepAliveInterval = 20;
     conn_opts.cleansession = 1;
@@ -88,12 +98,14 @@ void MqttSubscriber::start() {
     };
     conn_opts.context = this;
 
+    // 启动连接
     int rc;
     if ((rc = MQTTAsync_connect(client, &conn_opts)) != MQTTASYNC_SUCCESS) {
         qInfo() << "启动连接失败，返回编码" << rc;
     }
 }
 
+
 void MqttSubscriber::onConnect(MQTTAsync_successData* response) {
     retryTimer->stop();
     MQTTAsync_responseOptions opts = MQTTAsync_responseOptions_initializer;
@@ -128,17 +140,19 @@ void MqttSubscriber::reconnectAndFetchConfig() {
         re_config.mqttConfig.topic = topic;
         this->config = re_config.mqttConfig;
         this->init(re_config.mqttConfig, httpUrl, serialNumber);
-        start();
+        this->start();
     } else {
         qInfo() << "配置拉取失败，等待10秒后重试";
         instace.deleteObj(res);
-        retryTimer->start();  // 启动定时器，10秒后重试
+        QMetaObject::invokeMethod(retryTimer, "start", Qt::QueuedConnection);
     }
 }
 
 void MqttSubscriber::onConnectFailure(MQTTAsync_failureData* response) {
     qInfo() << "连接失败, rc" << (response ? response->code : -1);
-    retryTimer->start();
+    retryTimer->stop();  // 确保定时器在启动前被停止
+    // 确保定时器在主线程启动
+    QMetaObject::invokeMethod(retryTimer, "start", Qt::QueuedConnection);
 }
 
 void MqttSubscriber::onSubscribe(MQTTAsync_successData* response) {
@@ -240,4 +254,3 @@ void MqttSubscriber::onPublishSuccess(MQTTAsync_successData* response) {
 void MqttSubscriber::onPublishFailure(MQTTAsync_failureData* response) {
     qInfo() << "消息发布失败, rc" << (response ? response->code : -1);
 }
-