diff --git a/mpmaster/src/main/cpp/mpmaster.cpp b/mpmaster/src/main/cpp/mpmaster.cpp
index 54d16081..a7da0674 100644
--- a/mpmaster/src/main/cpp/mpmaster.cpp
+++ b/mpmaster/src/main/cpp/mpmaster.cpp
@@ -79,6 +79,15 @@ int setGpioInt(int cmd, int val)
     }
     return -1;
 }
+extern "C" JNIEXPORT jstring JNICALL
+Java_com_xypower_mpmaster_MpMasterService_getSerialNumber(
+        JNIEnv* env,
+        jclass cls) {
+
+    char value[PROP_VALUE_MAX] = { 0 };
+    __system_property_get("ro.serialno", value);
+    return env->NewStringUTF(value);
+}
 
 extern "C" JNIEXPORT jint JNICALL
 Java_com_xypower_mpmaster_MpMasterService_setInt(JNIEnv* env, jclass cls, jint cmd, jint val) {
diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
index c6c69c03..c8582795 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 = MpMasterService.getSerialNumber();
+        }
 
         logger.warning("Start Mntn report: " + masterUrl + " MntnMode=" + (mMntnMode ? "1" : "0") + " QuickHB=" + (mQuickHbMode ? "1" : "0"));
 
@@ -1347,6 +1351,7 @@ public class MpMasterService extends Service {
 
     public native static int getInt(int cmd);
     public native static int setInt(int cmd, int val);
+    public static native String getSerialNumber();
     public native static int[] getStats(long ts);
     public native static String getSystemProperty(String key);
     public native static void rebootDevice();