diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
index c6c69c03..ef029acc 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
@@ -567,6 +567,10 @@ public class MpMasterService extends Service {
         if (appConfig.heartbeat > 0) {
             mMpHeartbeatDuration = appConfig.heartbeat * 60000;
         }
+        if(TextUtils.isEmpty(appConfig.cmdid))
+        {
+            appConfig.cmdid = SysApi.getSerialNo(getApplicationContext());
+        }
 
         logger.warning("Start Mntn report: " + masterUrl + " MntnMode=" + (mMntnMode ? "1" : "0") + " QuickHB=" + (mQuickHbMode ? "1" : "0"));