diff --git a/DeviceConnection.cpp b/DeviceConnection.cpp
index b1f4d32..d4fa8a4 100644
--- a/DeviceConnection.cpp
+++ b/DeviceConnection.cpp
@@ -392,7 +392,7 @@ void DeviceConnection::requestOta(const QString &firmware, const QString &file)
         killTimer(m_heartbeatTimerId);
         m_heartbeatTimerId = -1;
     }
-    if (!m_requests.empty()) {
+    while (!m_requests.empty()) { // 清除之前的命令
         m_requests.pop();
     }
     Task task;
@@ -693,6 +693,9 @@ void DeviceConnection::onConnected() {
         if (m_otaTimer != nullptr) {
             m_otaTimer->stop();
         }
+        if (m_requestTimerId < 0) {
+            m_requestTimerId = startTimer(HeartbeatInterval);
+        }
     } else if (socket == m_h264Socket) {
         if (m_videoEnabled) {
             setLiveStreamEnabled(true);
@@ -703,6 +706,10 @@ void DeviceConnection::onConnected() {
 void DeviceConnection::onDisconnected() {
     auto socket = dynamic_cast<QTcpSocket *>(sender());
     if (socket == m_commandSocket) {
+        if (m_requestTimerId > 0) {
+            killTimer(m_requestTimerId);
+            m_requestTimerId = -1;
+        }
         if (m_heartbeatTimerId > 0) {
             killTimer(m_heartbeatTimerId);
             m_heartbeatTimerId = -1;
@@ -786,6 +793,7 @@ void DeviceConnection::timerEvent(QTimerEvent *event) {
             }
             heartbeats++;
         }
+    } else if (event->timerId() == m_requestTimerId) {
         if (!m_requests.empty()) {
             auto &command = m_requests.front();
             auto elapsed = duration_cast<milliseconds>(system_clock::now() - command.time);
diff --git a/DeviceConnection.h b/DeviceConnection.h
index bc6108d..2d6c80e 100644
--- a/DeviceConnection.h
+++ b/DeviceConnection.h
@@ -137,6 +137,7 @@ private:
 
     H264FrameCallback m_frameCallback;
     std::queue<Task> m_requests;
+    int m_requestTimerId = -1;
     int m_heartbeatTimerId = -1;
     int heartbeats = 0;
     NetworkInfomation m_networkInfomation;