1.添加一些ota升级调试信息。

OtaUpdate/CdcUpdater.cpp

@@ -87,13 +87,17 @@ bool CdcUpdater::write(Command command, const uint8_t *data, uint32_t size) {
 void CdcUpdater::timerEvent(QTimerEvent *event) {
     const auto serialPortInfos = QSerialPortInfo::availablePorts();
     for (const QSerialPortInfo &portInfo : serialPortInfos) {
+        LOG(info) << "portName:" << portInfo.portName().toStdString()
+                  << ", vendorIdentifier: " << portInfo.vendorIdentifier();
         if (portInfo.vendorIdentifier() == 0xffff) {
             LOG(info) << "founded device: " << portInfo.portName().toStdString();
             emit deviceDiscovered(portInfo);
             killTimer(m_timerId);
             m_timerId = -1;
+            break;
         }
     }
+    LOG(info) << "----------";
 }
 
 void CdcUpdater::transferBin() {