diff --git a/src/mqtt_client_wrapper.cpp b/src/mqtt_client_wrapper.cpp
index dac8abe..69bafb3 100644
--- a/src/mqtt_client_wrapper.cpp
+++ b/src/mqtt_client_wrapper.cpp
@@ -39,6 +39,26 @@ static void on_mqtt_connected()
 {
     LOG_INFO("[MQTT] Connected to broker: " + g_app_config.mqtt.server_ip);
 
+    // --- ★关键！MQTT 重连后立即执行全局复位 ---
+    g_streaming = false; // 清除推流状态
+    {
+        std::lock_guard<std::mutex> lock(g_dispatch_id_mutex);
+        g_dispatch_id.clear(); // 清除旧任务 ID
+    }
+
+    // 停掉所有流，清理 RTSP 状态
+    for (const auto &cam : g_app_config.cameras)
+    {
+        if (RTSPManager::is_streaming(cam.name))
+        {
+            RTSPManager::unmount_camera(cam);
+            LOG_WARN("[MQTT] Reconnected -> force unmount camera: " + cam.name);
+        }
+    }
+    // -------------------------------------------------------
+
+    send_heartbeat();
+
     const auto &topics = g_app_config.mqtt.topics;
     mqtt_client->subscribe(topics.video_down);
     mqtt_client->subscribe(topics.substream_down);
@@ -90,11 +110,14 @@ static void on_mqtt_message_received(const std::string &topic, const std::string
                     if (!cam.enabled)
                         continue;
 
-                    if (!RTSPManager::is_streaming(cam.name))
+                    if (RTSPManager::is_streaming(cam.name))
                     {
-                        RTSPManager::mount_camera(cam);
-                        LOG_INFO("[MQTT] Started streaming: " + cam.name);
+                        RTSPManager::unmount_camera(cam);
+                        LOG_WARN("[MQTT] Start-before-unmount: " + cam.name);
                     }
+
+                    RTSPManager::mount_camera(cam);
+                    LOG_INFO("[MQTT] Started streaming: " + cam.name);
                 }
             }
             else if (status == 1)
@@ -160,6 +183,14 @@ static void on_mqtt_message_received(const std::string &topic, const std::string
 
             LOG_WARN("[MQTT] Reset command received, errorCode=" + errCode + ", des=" + des);
 
+            // --- ★★ 新增：重置全局 streaming 状态与 dispatchId ---
+            g_streaming = false;
+            {
+                std::lock_guard<std::mutex> lock(g_dispatch_id_mutex);
+                g_dispatch_id.clear();
+            }
+            // ------------------------------------------------------
+
             // 停止所有流，相当于复位
             for (const auto &cam : g_app_config.cameras)
             {