diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
index ed616f40..a55fa83e 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
@@ -20,7 +20,6 @@ import android.os.Handler;
 import android.os.IBinder;
 import android.os.Message;
 import android.os.PowerManager;
-import android.os.SystemClock;
 import android.telephony.SignalStrength;
 import android.telephony.SubscriptionInfo;
 import android.telephony.SubscriptionManager;
@@ -42,13 +41,13 @@ import com.xypower.mpmaster.sms.SmsSendReceiver;
 import org.json.JSONObject;
 
 import java.io.File;
+import java.text.SimpleDateFormat;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.util.Arrays;
-import java.util.Calendar;
+import java.util.Collections;
 import java.util.Date;
 import java.util.List;
-import java.util.TimeZone;
 import java.util.logging.FileHandler;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -239,13 +238,6 @@ public class MpMasterService extends Service {
         IntentFilter intentFilter;
         intentFilter = new IntentFilter(SimUtil.SMS_SEND_ACTION);
         registerReceiver(mSmsSnedReceiver, intentFilter);
-
-        // AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
-
-        // startMaster(false);
-        startMpApp();
-
-        registerHeartbeatTimer();
     }
 
     public String getIccid(int number) {
@@ -300,6 +292,9 @@ public class MpMasterService extends Service {
         mUsingAbsHbTime = masterConfig.usingAbsHbTime != 0;
         mHeartbeatDuration = masterConfig.heartbeat * 60;   // minute to second
         mAbsHeartbeatTimes = masterConfig.absHeartbeats;
+        if (mAbsHeartbeatTimes != null && mAbsHeartbeatTimes.length > 0) {
+            Arrays.sort(mAbsHeartbeatTimes);
+        }
         mSeparateNetwork = masterConfig.separateNetwork != 0;
         mTimeOfMpAppAlive = masterConfig.mpappMonitorTimeout;
     }
@@ -456,7 +451,7 @@ public class MpMasterService extends Service {
 
         MicroPhotoContext.AppConfig appConfig = MicroPhotoContext.getMpAppConfig(getApplicationContext());
 
-        logger.warning("Start Mntn report:" + masterUrl);
+        logger.warning("Start Mntn report:" + masterUrl + " Mntn Mode=" + Boolean.toString(mMntnMode) + " QuickHB=" + Boolean.toString(mQuickHbMode));
 
         AppMaster appMaster = new AppMaster(this, masterUrl, appConfig.cmdid, bundleWithMpApp);
         appMaster.start();
@@ -475,6 +470,7 @@ public class MpMasterService extends Service {
             if (TextUtils.equals(ACTION_HEARTBEAT, action)) {
                 mService.logger.info("Heartbeat Timer Fired ACTION=" + action);
 
+                mService.mPreviousHB = null;
                 mService.registerHeartbeatTimer();
 
                 mService.startMaster(false);
@@ -550,10 +546,10 @@ public class MpMasterService extends Service {
         long timeout = mHeartbeatDuration;
         if (mMntnMode && mQuickHbMode) {
             timeout = mQuickHeartbeatDuration;
-            registerHeartbeatTimer(SystemClock.elapsedRealtime() + timeout * 1000);
+            registerHeartbeatTimer(System.currentTimeMillis() + timeout * 1000);
         } else {
             long closestTime = -1;
-            if (mAbsHeartbeatTimes != null && mAbsHeartbeatTimes.length > 0) {
+            if (mUsingAbsHbTime) {
                 Date dt = new Date();
                 long ts = dt.getTime();
                 ts -= ts % 1000;
@@ -564,21 +560,29 @@ public class MpMasterService extends Service {
 
                 long zeroPoint = dt.getTime();
                 zeroPoint -= zeroPoint % 1000;
-
                 long offsetTs = (ts - zeroPoint) / 1000;
-                for (int i = 0; i < mAbsHeartbeatTimes.length; i++) {
-                    if (mAbsHeartbeatTimes[i] >= offsetTs) {
-                        closestTime = mAbsHeartbeatTimes[i];
-                        break;
+
+                if (mAbsHeartbeatTimes != null && mAbsHeartbeatTimes.length > 0) {
+
+                    for (int i = 0; i < mAbsHeartbeatTimes.length; i++) {
+                        if (mAbsHeartbeatTimes[i] > offsetTs) {
+                            closestTime = mAbsHeartbeatTimes[i];
+                            break;
+                        }
                     }
-                }
 
-                if (closestTime == -1) {
-                    // next day
-                    closestTime = mAbsHeartbeatTimes[0] + 86400;
+                    if (closestTime == -1) {
+                        // next day
+                        closestTime = mAbsHeartbeatTimes[0] + 86400;
+                    }
+                } else {
+                    closestTime = 9 * 3600 + 13 * 60;
+                    if (offsetTs > closestTime) {
+                        closestTime += 86400;
+                    }
                 }
 
-                registerAbsHeartbeatTimer(zeroPoint + closestTime * 1000);
+                registerHeartbeatTimer(zeroPoint + closestTime * 1000);
             } else {
                 registerHeartbeatTimer(System.currentTimeMillis() + timeout * 1000);
             }
@@ -591,6 +595,7 @@ public class MpMasterService extends Service {
         if (mPreviousHB != null) {
             try {
                 alarmManager.cancel(mPreviousHB);
+                mPreviousHB = null;
             } catch (Exception ex) {
             }
             mPreviousHeartbeatTime = 0;
@@ -599,25 +604,9 @@ public class MpMasterService extends Service {
         alarmIntent.setAction(ACTION_HEARTBEAT);
         PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent, 0);
 
-        mPreviousHB = pendingIntent;
-        mPreviousHeartbeatTime = triggerTime;
-        alarmManager.setExactAndAllowWhileIdle(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggerTime, pendingIntent);
-    }
-
-    private void registerAbsHeartbeatTimer(long triggerTime) {
-
-        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
-        if (mPreviousHB != null) {
-            try {
-                alarmManager.cancel(mPreviousHB);
-            } catch (Exception ex) {
-            }
-            mPreviousHeartbeatTime = 0;
-        }
-        Intent alarmIntent = new Intent();
-        alarmIntent.setAction(ACTION_HEARTBEAT);
-        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent, 0);
-
+        Date dt = new Date(triggerTime);
+        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+        logger.info(String.format("Register HB:" + format.format(dt)));
         mPreviousHB = pendingIntent;
         mPreviousHeartbeatTime = triggerTime;
         alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, triggerTime, pendingIntent);
@@ -653,6 +642,9 @@ public class MpMasterService extends Service {
 
                 Log.i(TAG, "AppPath=" + appPath + " cmdid=" + cmdid);
 
+                // startMaster(false);
+                startMpApp();
+
                 registerHeartbeatTimer();
 
                 startMaster(false);