diff --git a/app/src/main/cpp/SensorsProtocol.cpp b/app/src/main/cpp/SensorsProtocol.cpp
index 7c0c97b7..a3eea8ac 100644
--- a/app/src/main/cpp/SensorsProtocol.cpp
+++ b/app/src/main/cpp/SensorsProtocol.cpp
@@ -1901,7 +1901,7 @@ void CameraPhotoPortDataProcess(SIO_PARAM_SERIAL_DEF *curserial)
 			iNo = rtumsg.MsgData[i + 1] + rtumsg.MsgData[i] * 256;
 			if((0xFF == rtumsg.MsgData[i+2]) && (3 == datalen))
 			{
-				curserial->SerialCmdidx = iNo + 1;
+				curserial->SerialCmdidx = iNo;
 				break;
 			}
 
diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
index 4e2cabe9..c599aad3 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
@@ -416,7 +416,7 @@ public class MpMasterService extends Service {
 
             long tempduration = mMpHeartbeatDuration;
             if(mMpHeartbeatDuration < 600000)
-                tempduration = 300000;
+                tempduration = 290000;
             if (mPreviousMpHbTime <= ts && ts - mPreviousMpHbTime > tempduration * 2) {
                 // MpApp is not running
                 if (ts - mTimeToStartMpApp >= 1800000) {