diff --git a/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java b/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
index a2befe3a..a951f22e 100644
--- a/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
+++ b/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
@@ -95,7 +95,7 @@ public class MicroPhotoService extends Service {
     public static final String ACTION_START = "com.xypower.mpapp.ACT_START";
     public static final String ACTION_STOP = "com.xypower.mpapp.ACT_STOP";
     public static final String ACTION_MAIN = "com.xypower.mpapp.ACT_MAIN";
-    private static final String ACTION_HEARTBEAT = "com.xypower.mpapp.ACT_HB";
+    private static final String ACTION_HEARTBEAT = MicroPhotoContext.ACTION_HEARTBEAT_MP;
     private static final String ACTION_TAKE_PHOTO = "com.xypower.mpapp.ACT_TP";
 
     private static final String ACTION_IMP_PUBKRY = "com.xypower.mpapp.ACT_IMP_PUBKEY";
@@ -225,20 +225,7 @@ public class MicroPhotoService extends Service {
             if (aci == null) {
                 break;
             }
-
-            /*
-            if (aci.getShowIntent().isBroadcast()) {
-                // alarmManager.cancel(aci.getShowIntent());
-            }
-
-             */
         }
-        // alarmManager.cancel();
-
-        // boolean res = false;
-        // Environment.getExternalStoragePublicDirectory(String)
-
-        // registerHeartbeatTimer(getHeartbeatDuration());
 
         enableGps(true);
         requestPosition();
diff --git a/common/src/main/java/com/xypower/common/MicroPhotoContext.java b/common/src/main/java/com/xypower/common/MicroPhotoContext.java
index 0f7cfc03..79e92995 100644
--- a/common/src/main/java/com/xypower/common/MicroPhotoContext.java
+++ b/common/src/main/java/com/xypower/common/MicroPhotoContext.java
@@ -25,6 +25,8 @@ public class MicroPhotoContext {
 
     public static final String PACKAGE_NAME_MPAPP = "com.xypower.mpapp";
     public static final String PACKAGE_NAME_MPMASTER = "com.xypower.mpmaster";
+    public static final String ACTION_HEARTBEAT_MP = "com.xypower.mpapp.ACT_HB";
+
     public final static String DEFAULT_MASTER_URL = "http://180.166.218.222:40101/";
     public final static String MASTER_URL_CMDID = "cmdid";
     public final static int DEFAULT_PROTOCOL = 0xFF00;
diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
index 3a3040c4..c02ef15d 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
@@ -114,6 +114,9 @@ public class MpMasterService extends Service {
 
     private boolean mSeparateNetwork = false;
 
+    private PendingIntent mPreviousHB = null;
+    private long mPreviousHeartbeatTime = 0;
+
     public MpMasterService() {
     }
     @Override
@@ -199,6 +202,9 @@ public class MpMasterService extends Service {
             intentFilter.addAction(ACTION_MSG_BROADCAST);
             intentFilter.addAction(ACTION_UPDATE_CONFIGS);
             intentFilter.addAction(ACTION_UPD_OTA);
+            if (!mSeparateNetwork) {
+                intentFilter.addAction(MicroPhotoContext.ACTION_HEARTBEAT_MP);
+            }
             registerReceiver(mAlarmReceiver, intentFilter);
         }
 
@@ -400,6 +406,15 @@ public class MpMasterService extends Service {
                 mService.startMaster();
                 mService.startMpApp();
 
+            } else if (TextUtils.equals(MicroPhotoContext.ACTION_HEARTBEAT_MP, action)) {
+                if (!mService.mSeparateNetwork && !mService.mMntnMode && !mService.mQuickHbMode) {
+                    mService.logger.info("Heartbeat Timer Fired By MpAPP ACTION=" + action);
+
+                    mService.registerHeartbeatTimer(mService.mPreviousHeartbeatTime + mService.mHeartbeatDuration * 1000);
+
+                    mService.startMaster();
+                    mService.startMpApp();
+                }
             } else if (TextUtils.equals(ACTION_UPDATE_CONFIGS, action)) {
                 int restart = intent.getIntExtra("restart", 0);
                 mService.logger.info("Update Config Fired ACTION=" + action + " restart=" + restart);
@@ -413,21 +428,9 @@ public class MpMasterService extends Service {
             }
         }
     }
-    private void registerHeartbeatTimer(int duration) {
-        int orgHeartbeatDuration = mHeartbeatDuration;
-        mHeartbeatDuration = duration;
-        if (orgHeartbeatDuration == 0) {
-            registerHeartbeatTimer();
-        }
 
-    }
     private void registerHeartbeatTimer() {
 
-        Intent alarmIntent = new Intent();
-        alarmIntent.setAction(ACTION_HEARTBEAT);
-        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent, 0);
-
-        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
         long timeout = mHeartbeatDuration;
         if (mMntnMode && mQuickHbMode) {
             timeout = mQuickHeartbeatDuration;
@@ -435,7 +438,26 @@ public class MpMasterService extends Service {
 
         }
 
-        alarmManager.setExactAndAllowWhileIdle(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + timeout * 1000, pendingIntent);
+        registerHeartbeatTimer(SystemClock.elapsedRealtime() + timeout * 1000);
+    }
+
+    private void registerHeartbeatTimer(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);
+
+        mPreviousHB = pendingIntent;
+        mPreviousHeartbeatTime = triggerTime;
+        alarmManager.setExactAndAllowWhileIdle(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggerTime, pendingIntent);
     }
 
     @Override