[IOT-1391] fix BLE scan logic which create thread.
[platform/upstream/iotivity.git] / resource / csdk / connectivity / src / bt_le_adapter / android / caleclient.c
index 4f5ee5c..d66408d 100644 (file)
 
 #define MICROSECS_PER_SEC 1000000
 #define WAIT_TIME_WRITE_CHARACTERISTIC 10 * MICROSECS_PER_SEC
+#define WAIT_TIME_SCAN_INTERVAL_DEFAULT 10
+#define WAIT_TIME_SCANNED_CHECKING 30
+
+#define GATT_CONNECTION_PRIORITY_BALANCED   0
+#define GATT_FAILURE                        257
+#define GATT_INSUFFICIENT_AUTHENTICATION    5
+#define GATT_INSUFFICIENT_ENCRYPTION        15
+#define GATT_INVALID_ATTRIBUTE_LENGTH       13
+#define GATT_INVALID_OFFSET                 7
+#define GATT_READ_NOT_PERMITTED             2
+#define GATT_REQUEST_NOT_SUPPORTED          6
+#define GATT_WRITE_NOT_PERMITTED            3
 
 static ca_thread_pool_t g_threadPoolHandle = NULL;
 
@@ -58,8 +70,6 @@ static jobjectArray g_uuidList = NULL;
 
 // it will be prevent to start send logic when adapter has stopped.
 static bool g_isStartedLEClient = false;
-static bool g_isStartedMulticastServer = false;
-static bool g_isStartedScan = false;
 
 static jbyteArray g_sendBuffer = NULL;
 static uint32_t g_targetCnt = 0;
@@ -82,11 +92,185 @@ static ca_mutex g_deviceListMutex = NULL;
 static ca_mutex g_gattObjectMutex = NULL;
 static ca_mutex g_deviceStateListMutex = NULL;
 
-static ca_mutex g_scanMutex = NULL;
+static ca_mutex g_deviceScanRetryDelayMutex = NULL;
+static ca_cond g_deviceScanRetryDelayCond = NULL;
+
+static ca_mutex g_threadScanIntervalMutex = NULL;
+static ca_cond g_threadScanIntervalCond = NULL;
+
+static ca_mutex g_threadSendStateMutex = NULL;
+
+static int32_t g_scanIntervalTime = WAIT_TIME_SCAN_INTERVAL_DEFAULT;
+static int32_t g_scanIntervalTimePrev = WAIT_TIME_SCAN_INTERVAL_DEFAULT;
+static int32_t g_intervalCount = 0;
+static bool g_isWorkingScanThread = false;
+static CALEScanState_t g_scanningStep = BLE_SCAN_DISABLE;
 
 static CABLEDataReceivedCallback g_CABLEClientDataReceivedCallback = NULL;
 
-static jboolean g_autoConnectFlag = JNI_FALSE;
+/**
+ * check if retry logic for connection routine has to be stopped or not.
+ * in case of error value including this method, connection routine has to be stopped.
+ * since there is no retry logic for this error reason in this client.
+ * @param state constant value of bluetoothgatt.
+ * @return true - waiting for background connection in BT platform.
+ *         false - connection routine has to be stopped.
+ */
+static bool CALECheckConnectionStateValue(jint state)
+{
+    switch(state)
+    {
+        case GATT_CONNECTION_PRIORITY_BALANCED:
+        case GATT_FAILURE:
+        case GATT_INSUFFICIENT_AUTHENTICATION:
+        case GATT_INSUFFICIENT_ENCRYPTION:
+        case GATT_INVALID_ATTRIBUTE_LENGTH:
+        case GATT_INVALID_OFFSET:
+        case GATT_READ_NOT_PERMITTED:
+        case GATT_REQUEST_NOT_SUPPORTED:
+        case GATT_WRITE_NOT_PERMITTED:
+            return true;
+        default:
+            return false;
+    }
+}
+
+void CALEClientSetScanInterval(int32_t intervalTime, int32_t workingCount)
+{
+    OIC_LOG_V(DEBUG, TAG, "CALEClientSetScanInterval : %d -> %d",
+              g_scanIntervalTime, intervalTime);
+
+    // previous time should be stored.
+    if (0 < workingCount)
+    {
+        g_scanIntervalTimePrev = g_scanIntervalTime;
+    }
+    g_scanIntervalTime = intervalTime;
+    g_intervalCount = workingCount;
+}
+
+void CALERestartScanWithInterval(int32_t intervalTime, int32_t workingCount)
+{
+    // restart scan with interval
+    CALEClientSetScanInterval(intervalTime, workingCount);
+    ca_cond_signal(g_threadScanIntervalCond);
+}
+
+static void CALEScanThread(void* object)
+{
+    (void)object;
+
+    bool isAttached = false;
+    JNIEnv* env = NULL;
+    jint res = (*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6);
+    if (JNI_OK != res)
+    {
+        OIC_LOG(INFO, TAG, "Could not get JNIEnv pointer");
+        res = (*g_jvm)->AttachCurrentThread(g_jvm, &env, NULL);
+
+        if (JNI_OK != res)
+        {
+            OIC_LOG(ERROR, TAG, "AttachCurrentThread has failed");
+            return;
+        }
+        isAttached = true;
+    }
+
+    ca_mutex_lock(g_threadScanIntervalMutex);
+    while(g_isWorkingScanThread)
+    {
+        OIC_LOG(DEBUG, TAG, "scan waiting time out");
+        if (BLE_SCAN_ENABLE == g_scanningStep)
+        {
+            //stop scan
+            CAResult_t ret = CALEClientStopScan();
+            if (CA_STATUS_OK != ret)
+            {
+                OIC_LOG(INFO, TAG, "CALEClientStopScan has failed");
+            }
+        }
+        else
+        {
+            //start scan
+            CAResult_t ret = CALEClientStartScan();
+            if (CA_STATUS_OK != ret)
+            {
+                OIC_LOG(INFO, TAG, "CALEClientStartScan has failed");
+            }
+        }
+
+        OIC_LOG_V(DEBUG, TAG, "wait for Scan Interval Time during %d sec", g_scanIntervalTime);
+        if (CA_WAIT_SUCCESS == ca_cond_wait_for(g_threadScanIntervalCond,
+                                                g_threadScanIntervalMutex,
+                                                g_scanIntervalTime * MICROSECS_PER_SEC))
+        {
+            // called signal scan thread will be terminated
+            OIC_LOG(DEBUG, TAG, "signal scanInterval waiting");
+            g_scanningStep = BLE_SCAN_DISABLE;
+        }
+        else
+        {
+           if (BLE_SCAN_ENABLE == g_scanningStep)
+           {
+               if (g_intervalCount > 0)
+               {
+                   if (g_intervalCount == 1)
+                   {
+                       OIC_LOG(DEBUG, TAG, "reset default time");
+                       CALEClientSetScanInterval(g_scanIntervalTimePrev, 0);
+                   }
+                   g_intervalCount--;
+                   OIC_LOG_V(DEBUG, TAG, "interval count : %d", g_intervalCount);
+               }
+               g_scanningStep = BLE_SCAN_DISABLE;
+           }
+           else
+           {
+               g_scanningStep = BLE_SCAN_ENABLE;
+           }
+        }
+    }
+    ca_mutex_unlock(g_threadScanIntervalMutex);
+
+    if (isAttached)
+    {
+        (*g_jvm)->DetachCurrentThread(g_jvm);
+    }
+}
+
+CAResult_t CALEClientStartScanWithInterval()
+{
+    OIC_LOG(DEBUG, TAG, "IN - CALEClientStartScanWithInterval");
+
+    if (g_isWorkingScanThread)
+    {
+        OIC_LOG(DEBUG, TAG, "scan interval logic already running");
+        return CA_STATUS_OK;
+    }
+
+    // initialize scan flags
+    g_scanningStep = BLE_SCAN_DISABLE;
+    g_isWorkingScanThread = true;
+    g_intervalCount = 0;
+    g_scanIntervalTime = g_scanIntervalTimePrev;
+
+    if (CA_STATUS_OK != ca_thread_pool_add_task(g_threadPoolHandle,
+                                                CALEScanThread, NULL))
+    {
+        OIC_LOG(ERROR, TAG, "Failed to create read thread!");
+        g_isWorkingScanThread = false;
+        return CA_STATUS_FAILED;
+    }
+
+    OIC_LOG(DEBUG, TAG, "OUT - CALEClientStartScanWithInterval");
+    return CA_STATUS_OK;
+}
+
+void CALEClientStopScanWithInterval()
+{
+    g_isWorkingScanThread = false;
+    ca_cond_signal(g_threadScanIntervalCond);
+}
 
 //getting jvm
 void CALEClientJniInit()
@@ -118,7 +302,7 @@ CAResult_t CALECreateJniInterfaceObject()
     }
 
     bool isAttached = false;
-    JNIEnv* env;
+    JNIEnv* env = NULL;
     jint res = (*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6);
     if (JNI_OK != res)
     {
@@ -133,6 +317,24 @@ CAResult_t CALECreateJniInterfaceObject()
         isAttached = true;
     }
 
+    jmethodID mid_getApplicationContext = CAGetJNIMethodID(env, "android/content/Context",
+                                                           "getApplicationContext",
+                                                           "()Landroid/content/Context;");
+
+    if (!mid_getApplicationContext)
+    {
+        OIC_LOG(ERROR, TAG, "Could not get getApplicationContext method");
+        return CA_STATUS_FAILED;
+    }
+
+    jobject jApplicationContext = (*env)->CallObjectMethod(env, g_context,
+                                                           mid_getApplicationContext);
+    if (!jApplicationContext)
+    {
+        OIC_LOG(ERROR, TAG, "Could not get application context");
+        return CA_STATUS_FAILED;
+    }
+
     jclass jni_LEInterface = (*env)->FindClass(env, "org/iotivity/ca/CaLeClientInterface");
     if (!jni_LEInterface)
     {
@@ -148,7 +350,7 @@ CAResult_t CALECreateJniInterfaceObject()
         goto error_exit;
     }
 
-    (*env)->NewObject(env, jni_LEInterface, LeInterfaceConstructorMethod, g_context);
+    (*env)->NewObject(env, jni_LEInterface, LeInterfaceConstructorMethod, jApplicationContext);
     OIC_LOG(DEBUG, TAG, "Create instance for CaLeClientInterface");
 
     if (isAttached)
@@ -181,7 +383,7 @@ CAResult_t CALEClientInitialize()
     }
 
     bool isAttached = false;
-    JNIEnv* env;
+    JNIEnv* env = NULL;
     jint res = (*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6);
     if (JNI_OK != res)
     {
@@ -228,6 +430,8 @@ CAResult_t CALEClientInitialize()
     // init mutex for send logic
     g_threadCond = ca_cond_new();
     g_threadWriteCharacteristicCond = ca_cond_new();
+    g_deviceScanRetryDelayCond = ca_cond_new();
+    g_threadScanIntervalCond =  ca_cond_new();
 
     CALEClientCreateDeviceList();
     CALEClientJNISetContext();
@@ -278,7 +482,7 @@ void CALEClientTerminate()
     }
 
     bool isAttached = false;
-    JNIEnv* env;
+    JNIEnv* env = NULL;
     jint res = (*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6);
     if (JNI_OK != res)
     {
@@ -296,21 +500,25 @@ void CALEClientTerminate()
     if (g_leScanCallback)
     {
         (*env)->DeleteGlobalRef(env, g_leScanCallback);
+        g_leScanCallback = NULL;
     }
 
     if (g_leGattCallback)
     {
         (*env)->DeleteGlobalRef(env, g_leGattCallback);
+        g_leGattCallback = NULL;
     }
 
     if (g_sendBuffer)
     {
         (*env)->DeleteGlobalRef(env, g_sendBuffer);
+        g_sendBuffer = NULL;
     }
 
     if (g_uuidList)
     {
         (*env)->DeleteGlobalRef(env, g_uuidList);
+        g_uuidList = NULL;
     }
 
     CAResult_t ret = CALEClientRemoveAllDeviceState();
@@ -331,9 +539,7 @@ void CALEClientTerminate()
         OIC_LOG(ERROR, TAG, "CALEClientRemoveAllGattObjs has failed");
     }
 
-    g_isStartedMulticastServer = false;
-    CALEClientSetScanFlag(false);
-    CALEClientSetSendFinishFlag(false);
+    CALEClientSetSendFinishFlag(true);
 
     CALEClientTerminateGattMutexVariables();
     CALEClientDestroyJniInterface();
@@ -341,12 +547,19 @@ void CALEClientTerminate()
     ca_cond_free(g_deviceDescCond);
     ca_cond_free(g_threadCond);
     ca_cond_free(g_threadWriteCharacteristicCond);
+    ca_cond_free(g_deviceScanRetryDelayCond);
+    ca_cond_free(g_threadScanIntervalCond);
 
     g_deviceDescCond = NULL;
     g_threadCond = NULL;
     g_threadWriteCharacteristicCond = NULL;
+    g_deviceScanRetryDelayCond = NULL;
+    g_threadScanIntervalCond = NULL;
+
     g_isSignalSetFlag = false;
-    CALEClientSetAutoConnectFlag(JNI_FALSE);
+
+    // stop scanning
+    CALEClientStopScanWithInterval();
 
     if (isAttached)
     {
@@ -365,7 +578,7 @@ CAResult_t CALEClientDestroyJniInterface()
     }
 
     bool isAttached = false;
-    JNIEnv* env;
+    JNIEnv* env = NULL;
     jint res = (*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6);
     if (JNI_OK != res)
     {
@@ -465,7 +678,7 @@ CAResult_t CALEClientSendMulticastMessage(const uint8_t* data,
     }
 
     bool isAttached = false;
-    JNIEnv* env;
+    JNIEnv* env = NULL;
     jint res = (*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6);
     if (JNI_OK != res)
     {
@@ -496,6 +709,9 @@ CAResult_t CALEClientSendMulticastMessage(const uint8_t* data,
 
 CAResult_t CALEClientStartUnicastServer(const char* address)
 {
+#ifndef TB_LOG
+    (void)address;
+#endif
     OIC_LOG_V(DEBUG, TAG, "it is not needed in this platform (%s)", address);
 
     return CA_NOT_SUPPORTED;
@@ -503,49 +719,9 @@ CAResult_t CALEClientStartUnicastServer(const char* address)
 
 CAResult_t CALEClientStartMulticastServer()
 {
-    OIC_LOG(DEBUG, TAG, "CALEClientStartMulticastServer");
-
-    if (g_isStartedMulticastServer)
-    {
-        OIC_LOG(ERROR, TAG, "server is already started..it will be skipped");
-        return CA_STATUS_FAILED;
-    }
-
-    if (!g_jvm)
-    {
-        OIC_LOG(ERROR, TAG, "g_jvm is null");
-        return CA_STATUS_FAILED;
-    }
-
-    bool isAttached = false;
-    JNIEnv* env;
-    jint res = (*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6);
-    if (JNI_OK != res)
-    {
-        OIC_LOG(INFO, TAG, "Could not get JNIEnv pointer");
-        res = (*g_jvm)->AttachCurrentThread(g_jvm, &env, NULL);
-
-        if (JNI_OK != res)
-        {
-            OIC_LOG(ERROR, TAG, "AttachCurrentThread has failed");
-            return CA_STATUS_FAILED;
-        }
-        isAttached = true;
-    }
-
-    g_isStartedMulticastServer = true;
-    CAResult_t ret = CALEClientStartScan();
-    if (CA_STATUS_OK != ret)
-    {
-        OIC_LOG(ERROR, TAG, "CALEClientStartScan has failed");
-    }
-
-    if (isAttached)
-    {
-        (*g_jvm)->DetachCurrentThread(g_jvm);
-    }
+    OIC_LOG(DEBUG, TAG, "it is not needed in this platform");
 
-    return ret;
+    return CA_NOT_SUPPORTED;
 }
 
 void CALEClientStopUnicastServer()
@@ -556,13 +732,6 @@ void CALEClientStopUnicastServer()
 void CALEClientStopMulticastServer()
 {
     OIC_LOG(DEBUG, TAG, "CALEClientStopMulticastServer");
-    g_isStartedMulticastServer = false;
-    CAResult_t res = CALEClientStopScan();
-    if (CA_STATUS_OK != res)
-    {
-        OIC_LOG(ERROR, TAG, "CALEClientStartScan has failed");
-        return;
-    }
 }
 
 void CALEClientSetCallback(CAPacketReceiveCallback callback)
@@ -575,14 +744,18 @@ void CASetBLEClientErrorHandleCallback(CABLEErrorHandleCallback callback)
     g_clientErrorCallback = callback;
 }
 
-CAResult_t CALEClientIsThereScannedDevices()
+CAResult_t CALEClientIsThereScannedDevices(JNIEnv *env, const char* address)
 {
+    VERIFY_NON_NULL(env, TAG, "env");
+
     if (!g_deviceList)
     {
+        OIC_LOG(ERROR, TAG, "g_deviceList is not available");
         return CA_STATUS_FAILED;
     }
 
-    if (0 == u_arraylist_length(g_deviceList))
+    if (0 == u_arraylist_length(g_deviceList) // multicast
+            || (address && !CALEClientIsDeviceInScanDeviceList(env, address))) // unicast
     {
         // Wait for LE peripherals to be discovered.
 
@@ -592,32 +765,79 @@ CAResult_t CALEClientIsThereScannedDevices()
         static uint64_t const TIMEOUT =
             2 * MICROSECS_PER_SEC;  // Microseconds
 
+        // set scan interval and start scan
+        CALERestartScanWithInterval(WAIT_TIME_SCANNED_CHECKING, 1);
+
         bool devicesDiscovered = false;
-        for (size_t i = 0;
-             0 == u_arraylist_length(g_deviceList) && i < RETRIES;
-             ++i)
+        for (size_t i = 0; i < RETRIES; ++i)
         {
+            OIC_LOG(DEBUG, TAG, "waiting for target device");
             if (ca_cond_wait_for(g_deviceDescCond,
                                  g_threadSendMutex,
                                  TIMEOUT) == CA_WAIT_SUCCESS)
             {
-                devicesDiscovered = true;
-                break;
+                ca_mutex_lock(g_deviceListMutex);
+                size_t scannedDeviceLen = u_arraylist_length(g_deviceList);
+                ca_mutex_unlock(g_deviceListMutex);
+
+                if (0 < scannedDeviceLen)
+                {
+                    if (!address  // multicast
+                        || (address && CALEClientIsDeviceInScanDeviceList(env, address))) // unicast
+                    {
+                      devicesDiscovered = true;
+                      break;
+                    }
+                    else
+                    {
+                        if (address)
+                        {
+                            OIC_LOG(INFO, TAG, "waiting..");
+
+                            ca_mutex_lock(g_deviceScanRetryDelayMutex);
+                            if (ca_cond_wait_for(g_deviceScanRetryDelayCond,
+                                                 g_deviceScanRetryDelayMutex,
+                                                 MICROSECS_PER_SEC) == CA_WAIT_SUCCESS)
+                            {
+                                OIC_LOG(INFO, TAG, "finish to waiting for target device");
+                                ca_mutex_unlock(g_deviceScanRetryDelayMutex);
+                                break;
+                            }
+                            ca_mutex_unlock(g_deviceScanRetryDelayMutex);
+                            // time out
+
+                            // checking whether a target device is found while waiting for time-out.
+                            if (CALEClientIsDeviceInScanDeviceList(env, address))
+                            {
+                                devicesDiscovered = true;
+                                break;
+                            }
+                        }
+                    }
+                }
             }
         }
 
+        // reset scan interval time after checking scanned devices
+        CALERestartScanWithInterval(g_scanIntervalTimePrev, 0);
+
         // time out for scanning devices
         if (!devicesDiscovered)
         {
             return CA_STATUS_FAILED;
         }
     }
+    else
+    {
+        OIC_LOG(DEBUG, TAG, "there is a target device in the scanned devices");
+    }
 
     return CA_STATUS_OK;
 }
 
+
 CAResult_t CALEClientSendUnicastMessageImpl(const char* address, const uint8_t* data,
-                                      const uint32_t dataLen)
+                                            const uint32_t dataLen)
 {
     OIC_LOG_V(DEBUG, TAG, "CALEClientSendUnicastMessageImpl, address: %s, data: %p", address,
               data);
@@ -631,7 +851,7 @@ CAResult_t CALEClientSendUnicastMessageImpl(const char* address, const uint8_t*
     }
 
     bool isAttached = false;
-    JNIEnv* env;
+    JNIEnv* env = NULL;
     jint res = (*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6);
     if (JNI_OK != res)
     {
@@ -649,7 +869,7 @@ CAResult_t CALEClientSendUnicastMessageImpl(const char* address, const uint8_t*
 
     CALEClientSetSendFinishFlag(false);
 
-    CAResult_t ret = CALEClientIsThereScannedDevices();
+    CAResult_t ret = CALEClientIsThereScannedDevices(env, address);
     if (CA_STATUS_OK != ret)
     {
         OIC_LOG(INFO, TAG, "there is no scanned device");
@@ -687,14 +907,7 @@ CAResult_t CALEClientSendUnicastMessageImpl(const char* address, const uint8_t*
             if (!strcmp(setAddress, address))
             {
                 (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
-
-                // connect to gatt server
-                ret = CALEClientStopScan();
-                if (CA_STATUS_OK != ret)
-                {
-                    OIC_LOG(ERROR, TAG, "CALEClientStopScan has failed");
-                    goto error_exit;
-                }
+                (*env)->DeleteLocalRef(env, jni_setAddress);
 
                 if (g_sendBuffer)
                 {
@@ -719,6 +932,7 @@ CAResult_t CALEClientSendUnicastMessageImpl(const char* address, const uint8_t*
                 break;
             }
             (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
+            (*env)->DeleteLocalRef(env, jni_setAddress);
         }
     }
 
@@ -740,44 +954,36 @@ CAResult_t CALEClientSendUnicastMessageImpl(const char* address, const uint8_t*
         (*g_jvm)->DetachCurrentThread(g_jvm);
     }
 
-    // start LE Scan again
-    ret = CALEClientStartScan();
-    if (CA_STATUS_OK != ret)
+    ca_mutex_unlock(g_threadSendMutex);
+    OIC_LOG(INFO, TAG, "unicast - send logic has finished");
+    if (CALEClientIsValidState(address, CA_LE_SEND_STATE,
+                               STATE_SEND_SUCCESS))
     {
-        OIC_LOG(ERROR, TAG, "CALEClientStartScan has failed");
-        ca_mutex_unlock(g_threadSendMutex);
-        return res;
+        ret = CA_STATUS_OK;
+    }
+    else
+    {
+        ret = CA_SEND_FAILED;
     }
 
-    ca_mutex_unlock(g_threadSendMutex);
-    OIC_LOG(INFO, TAG, "unicast - send success");
-    return CA_STATUS_OK;
-
-    // error label.
-error_exit:
-
-    // start LE Scan again
-    ret = CALEClientStartScan();
-    if (CA_STATUS_OK != ret)
+    // reset send state
+    CAResult_t resetRet = CALEClientUpdateDeviceState(address, CA_LE_SEND_STATE,
+                                                      STATE_SEND_NONE);
+    if (CA_STATUS_OK != resetRet)
     {
-        OIC_LOG(ERROR, TAG, "CALEClientStartScan has failed");
-        ca_mutex_unlock(g_threadSendMutex);
-        if (isAttached)
-        {
-            (*g_jvm)->DetachCurrentThread(g_jvm);
-        }
-        return res;
+        OIC_LOG_V(ERROR, TAG, "CALEClientUpdateDeviceState has failed (%d)", resetRet);
+        ret = CA_SEND_FAILED;
     }
 
+    return ret;
+
+    // error label.
+error_exit:
     if (isAttached)
     {
         (*g_jvm)->DetachCurrentThread(g_jvm);
     }
 
-    if (g_clientErrorCallback)
-    {
-        g_clientErrorCallback(address, data, dataLen, CA_SEND_FAILED);
-    }
     ca_mutex_unlock(g_threadSendMutex);
     return CA_SEND_FAILED;
 }
@@ -806,21 +1012,13 @@ CAResult_t CALEClientSendMulticastMessageImpl(JNIEnv *env, const uint8_t* data,
         g_sendBuffer = NULL;
     }
 
-    CAResult_t res = CALEClientIsThereScannedDevices();
+    CAResult_t res = CALEClientIsThereScannedDevices(env, NULL);
     if (CA_STATUS_OK != res)
     {
         OIC_LOG(INFO, TAG, "there is no scanned device");
         goto error_exit;
     }
 
-    // connect to gatt server
-    res = CALEClientStopScan();
-    if (CA_STATUS_OK != res)
-    {
-        OIC_LOG(ERROR, TAG, "CALEClientStopScan has failed");
-        ca_mutex_unlock(g_threadSendMutex);
-        return res;
-    }
     uint32_t length = u_arraylist_length(g_deviceList);
     g_targetCnt = length;
 
@@ -842,22 +1040,6 @@ CAResult_t CALEClientSendMulticastMessageImpl(JNIEnv *env, const uint8_t* data,
         {
             OIC_LOG(ERROR, TAG, "BT device - send has failed");
         }
-
-        jstring jni_address = CALEGetAddressFromBTDevice(env, jarrayObj);
-        if (!jni_address)
-        {
-            OIC_LOG(ERROR, TAG, "CALEGetAddressFromBTDevice has failed");
-            continue;
-        }
-
-        const char* address = (*env)->GetStringUTFChars(env, jni_address, NULL);
-        if (!address)
-        {
-            OIC_LOG(ERROR, TAG, "address is not available");
-            continue;
-        }
-
-        (*env)->ReleaseStringUTFChars(env, jni_address, address);
     }
 
     OIC_LOG(DEBUG, TAG, "connection routine is finished for multicast");
@@ -871,57 +1053,16 @@ CAResult_t CALEClientSendMulticastMessageImpl(JNIEnv *env, const uint8_t* data,
         OIC_LOG(DEBUG, TAG, "the data was sent");
     }
     ca_mutex_unlock(g_threadMutex);
-
-    // start LE Scan again
-    res = CALEClientStartScan();
-    if (CA_STATUS_OK != res)
-    {
-        OIC_LOG(ERROR, TAG, "CALEClientStartScan has failed");
-        ca_mutex_unlock(g_threadSendMutex);
-        return res;
-    }
-
     ca_mutex_unlock(g_threadSendMutex);
     OIC_LOG(DEBUG, TAG, "OUT - CALEClientSendMulticastMessageImpl");
     return CA_STATUS_OK;
 
 error_exit:
-    res = CALEClientStartScan();
-    if (CA_STATUS_OK != res)
-    {
-        OIC_LOG(ERROR, TAG, "CALEClientStartScan has failed");
-        ca_mutex_unlock(g_threadSendMutex);
-        return res;
-    }
-
     ca_mutex_unlock(g_threadSendMutex);
-    OIC_LOG(DEBUG, TAG, "OUT - CALEClientSendMulticastMessageImpl");
+    OIC_LOG(ERROR, TAG, "OUT - CALEClientSendMulticastMessageImpl");
     return CA_SEND_FAILED;
 }
 
-CAResult_t CALECheckSendState(const char* address)
-{
-    VERIFY_NON_NULL(address, TAG, "address is null");
-
-    ca_mutex_lock(g_deviceStateListMutex);
-    CALEState_t* state = CALEClientGetStateInfo(address);
-    if (NULL == state)
-    {
-        OIC_LOG(ERROR, TAG, "state is null");
-        ca_mutex_unlock(g_deviceStateListMutex);
-        return CA_SEND_FAILED;
-    }
-
-    if (STATE_SEND_SUCCESS != state->sendState)
-    {
-        OIC_LOG(ERROR, TAG, "sendstate is not STATE_SEND_SUCCESS");
-        ca_mutex_unlock(g_deviceStateListMutex);
-        return CA_SEND_FAILED;
-    }
-    ca_mutex_unlock(g_deviceStateListMutex);
-    return CA_STATUS_OK;
-}
-
 CAResult_t CALEClientSendData(JNIEnv *env, jobject device)
 {
     OIC_LOG(DEBUG, TAG, "IN - CALEClientSendData");
@@ -944,7 +1085,6 @@ CAResult_t CALEClientSendData(JNIEnv *env, jobject device)
         ca_mutex_lock(g_deviceStateListMutex);
         state = CALEClientGetStateInfo(address);
         ca_mutex_unlock(g_deviceStateListMutex);
-        (*env)->ReleaseStringUTFChars(env, jni_address, address);
     }
 
     if (!state)
@@ -955,13 +1095,6 @@ CAResult_t CALEClientSendData(JNIEnv *env, jobject device)
         // if there is gatt object in g_gattObjectList.
         if (jni_address)
         {
-            address = (char*)(*env)->GetStringUTFChars(env, jni_address, NULL);
-            if (!address)
-            {
-                OIC_LOG(ERROR, TAG, "address is not available");
-                return CA_STATUS_FAILED;
-            }
-
             jobject gatt = CALEClientGetGattObjInList(env, address);
             if (gatt)
             {
@@ -975,7 +1108,8 @@ CAResult_t CALEClientSendData(JNIEnv *env, jobject device)
         }
 
         // connection request
-        jobject newGatt = CALEClientConnect(env, device, CALEClientGetAutoConnectFlag());
+        jobject newGatt = CALEClientConnect(env, device,
+                                            JNI_FALSE);
         if (NULL == newGatt)
         {
             OIC_LOG(ERROR, TAG, "CALEClientConnect has failed");
@@ -984,21 +1118,10 @@ CAResult_t CALEClientSendData(JNIEnv *env, jobject device)
     }
     else
     {
-        if (STATE_CONNECTED == state->connectedState)
+        if (CALEClientIsValidState(address, CA_LE_CONNECTION_STATE,
+                                   STATE_SERVICE_CONNECTED))
         {
             OIC_LOG(INFO, TAG, "GATT has already connected");
-            if (!jni_address)
-            {
-                OIC_LOG(ERROR, TAG, "jni_address is not available");
-                return CA_STATUS_FAILED;
-            }
-
-            address = (char*)(*env)->GetStringUTFChars(env, jni_address, NULL);
-            if (!address)
-            {
-                OIC_LOG(ERROR, TAG, "address is not available");
-                return CA_STATUS_FAILED;
-            }
 
             jobject gatt = CALEClientGetGattObjInList(env, address);
             if (!gatt)
@@ -1017,7 +1140,13 @@ CAResult_t CALEClientSendData(JNIEnv *env, jobject device)
             }
             (*env)->ReleaseStringUTFChars(env, jni_address, address);
         }
-        else
+        else if(CALEClientIsValidState(address, CA_LE_CONNECTION_STATE,
+                                       STATE_CONNECTED))
+        {
+            OIC_LOG(INFO, TAG, "service connecting...");
+        }
+        else if(CALEClientIsValidState(address, CA_LE_CONNECTION_STATE,
+                                       STATE_DISCONNECTED))
         {
             OIC_LOG(INFO, TAG, "STATE_DISCONNECTED - start to connect LE");
 
@@ -1025,13 +1154,6 @@ CAResult_t CALEClientSendData(JNIEnv *env, jobject device)
             // if there is gatt object in g_gattObjectList.
             if (jni_address)
             {
-                address = (char*)(*env)->GetStringUTFChars(env, jni_address, NULL);
-                if (!address)
-                {
-                    OIC_LOG(ERROR, TAG, "address is not available");
-                    return CA_STATUS_FAILED;
-                }
-
                 jobject gatt = CALEClientGetGattObjInList(env, address);
                 if (gatt)
                 {
@@ -1045,7 +1167,10 @@ CAResult_t CALEClientSendData(JNIEnv *env, jobject device)
             }
 
             OIC_LOG(DEBUG, TAG, "start to connect LE");
-            jobject gatt = CALEClientConnect(env, device, JNI_TRUE);
+            jobject gatt = CALEClientConnect(env, device,
+                                             CALEClientGetFlagFromState(env, jni_address,
+                                                                        CA_LE_AUTO_CONNECT_FLAG));
+
             if (NULL == gatt)
             {
                 OIC_LOG(ERROR, TAG, "CALEClientConnect has failed");
@@ -1062,15 +1187,8 @@ jstring CALEClientGetAddressFromGattObj(JNIEnv *env, jobject gatt)
     VERIFY_NON_NULL_RET(gatt, TAG, "gatt is null", NULL);
     VERIFY_NON_NULL_RET(env, TAG, "env is null", NULL);
 
-    jclass jni_cid_gattdevice_list = (*env)->FindClass(env, CLASSPATH_BT_GATT);
-    if (!jni_cid_gattdevice_list)
-    {
-        OIC_LOG(ERROR, TAG, "jni_cid_gattdevice_list is null");
-        return NULL;
-    }
-
-    jmethodID jni_mid_getDevice = (*env)->GetMethodID(env, jni_cid_gattdevice_list, "getDevice",
-                                                      "()Landroid/bluetooth/BluetoothDevice;");
+    jmethodID jni_mid_getDevice = CAGetJNIMethodID(env, CLASSPATH_BT_GATT, "getDevice",
+                                                   "()Landroid/bluetooth/BluetoothDevice;");
     if (!jni_mid_getDevice)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_getDevice is null");
@@ -1104,16 +1222,9 @@ CAResult_t CALEClientGattClose(JNIEnv *env, jobject bluetoothGatt)
     VERIFY_NON_NULL(bluetoothGatt, TAG, "bluetoothGatt is null");
     VERIFY_NON_NULL(env, TAG, "env is null");
 
-    // get BluetoothGatt class
-    OIC_LOG(DEBUG, TAG, "get BluetoothGatt class");
-    jclass jni_cid_BluetoothGatt = (*env)->FindClass(env, CLASSPATH_BT_GATT);
-    if (!jni_cid_BluetoothGatt)
-    {
-        OIC_LOG(ERROR, TAG, "jni_cid_BluetoothGatt is null");
-        return CA_STATUS_FAILED;
-    }
-
-    jmethodID jni_mid_closeGatt = (*env)->GetMethodID(env, jni_cid_BluetoothGatt, "close", "()V");
+    // get BluetoothGatt method
+    OIC_LOG(DEBUG, TAG, "get BluetoothGatt method");
+    jmethodID jni_mid_closeGatt = CAGetJNIMethodID(env, CLASSPATH_BT_GATT, "close", "()V");
     if (!jni_mid_closeGatt)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_closeGatt is null");
@@ -1137,15 +1248,9 @@ CAResult_t CALEClientGattClose(JNIEnv *env, jobject bluetoothGatt)
 
 CAResult_t CALEClientStartScan()
 {
-    if (!g_isStartedMulticastServer)
+    if (!g_isStartedLEClient)
     {
-        OIC_LOG(ERROR, TAG, "server is not started yet..scan will be passed");
-        return CA_STATUS_FAILED;
-    }
-
-    if (!g_isStartedLEClient)
-    {
-        OIC_LOG(ERROR, TAG, "LE client is not started");
+        OIC_LOG(ERROR, TAG, "LE client is not started");
         return CA_STATUS_FAILED;
     }
 
@@ -1155,14 +1260,8 @@ CAResult_t CALEClientStartScan()
         return CA_STATUS_FAILED;
     }
 
-    if (g_isStartedScan)
-    {
-        OIC_LOG(INFO, TAG, "scanning is already started");
-        return CA_STATUS_OK;
-    }
-
     bool isAttached = false;
-    JNIEnv* env;
+    JNIEnv* env = NULL;
     jint res = (*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6);
     if (JNI_OK != res)
     {
@@ -1235,6 +1334,7 @@ CAResult_t CALEClientStartScanImpl(JNIEnv *env, jobject callback)
     if (!jni_mid_getDefaultAdapter)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_getDefaultAdapter is null");
+        (*env)->DeleteLocalRef(env, jni_cid_BTAdapter);
         return CA_STATUS_FAILED;
     }
 
@@ -1245,6 +1345,7 @@ CAResult_t CALEClientStartScanImpl(JNIEnv *env, jobject callback)
     if (!jni_mid_startLeScan)
     {
         OIC_LOG(ERROR, TAG, "startLeScan: jni_mid_startLeScan is null");
+        (*env)->DeleteLocalRef(env, jni_cid_BTAdapter);
         return CA_STATUS_FAILED;
     }
 
@@ -1254,23 +1355,25 @@ CAResult_t CALEClientStartScanImpl(JNIEnv *env, jobject callback)
     if (!jni_obj_BTAdapter)
     {
         OIC_LOG(ERROR, TAG, "getState From BTAdapter: jni_obj_BTAdapter is null");
+        (*env)->DeleteLocalRef(env, jni_cid_BTAdapter);
         return CA_STATUS_FAILED;
     }
 
     // call start le scan method
+    OIC_LOG(INFO, TAG, "CALL API - startLeScan");
     jboolean jni_obj_startLeScan = (*env)->CallBooleanMethod(env, jni_obj_BTAdapter,
                                                              jni_mid_startLeScan, callback);
     if (!jni_obj_startLeScan)
     {
-        OIC_LOG(ERROR, TAG, "startLeScan is failed");
-        return CA_STATUS_FAILED;
+        OIC_LOG(INFO, TAG, "startLeScan has failed");
     }
     else
     {
-        OIC_LOG(DEBUG, TAG, "startLeScan is started");
-        CALEClientSetScanFlag(true);
+        OIC_LOG(DEBUG, TAG, "LeScan has started");
     }
 
+    (*env)->DeleteLocalRef(env, jni_cid_BTAdapter);
+    (*env)->DeleteLocalRef(env, jni_obj_BTAdapter);
     return CA_STATUS_OK;
 }
 
@@ -1300,6 +1403,7 @@ CAResult_t CALEClientStartScanWithUUIDImpl(JNIEnv *env, jobjectArray uuids, jobj
     if (!jni_mid_getDefaultAdapter)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_getDefaultAdapter is null");
+        (*env)->DeleteLocalRef(env, jni_cid_BTAdapter);
         return CA_STATUS_FAILED;
     }
 
@@ -1310,6 +1414,7 @@ CAResult_t CALEClientStartScanWithUUIDImpl(JNIEnv *env, jobjectArray uuids, jobj
     if (!jni_mid_startLeScan)
     {
         OIC_LOG(ERROR, TAG, "startLeScan: jni_mid_startLeScan is null");
+        (*env)->DeleteLocalRef(env, jni_cid_BTAdapter);
         return CA_STATUS_FAILED;
     }
 
@@ -1319,23 +1424,25 @@ CAResult_t CALEClientStartScanWithUUIDImpl(JNIEnv *env, jobjectArray uuids, jobj
     if (!jni_obj_BTAdapter)
     {
         OIC_LOG(ERROR, TAG, "getState From BTAdapter: jni_obj_BTAdapter is null");
+        (*env)->DeleteLocalRef(env, jni_cid_BTAdapter);
         return CA_STATUS_FAILED;
     }
 
     // call start le scan method
+    OIC_LOG(INFO, TAG, "CALL API - startLeScan (with UUID)");
     jboolean jni_obj_startLeScan = (*env)->CallBooleanMethod(env, jni_obj_BTAdapter,
                                                              jni_mid_startLeScan, uuids, callback);
     if (!jni_obj_startLeScan)
     {
-        OIC_LOG(ERROR, TAG, "startLeScan With UUID is failed");
-        return CA_STATUS_FAILED;
+        OIC_LOG(INFO, TAG, "startLeScan has failed");
     }
     else
     {
-        OIC_LOG(DEBUG, TAG, "startLeScan With UUID is started");
-        CALEClientSetScanFlag(true);
+        OIC_LOG(DEBUG, TAG, "LeScan has started");
     }
 
+    (*env)->DeleteLocalRef(env, jni_cid_BTAdapter);
+    (*env)->DeleteLocalRef(env, jni_obj_BTAdapter);
     return CA_STATUS_OK;
 }
 
@@ -1381,14 +1488,8 @@ CAResult_t CALEClientStopScan()
         return CA_STATUS_FAILED;
     }
 
-    if (!g_isStartedScan)
-    {
-        OIC_LOG(INFO, TAG, "scanning is already stopped");
-        return CA_STATUS_OK;
-    }
-
     bool isAttached = false;
-    JNIEnv* env;
+    JNIEnv* env = NULL;
     jint res = (*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6);
     if (JNI_OK != res)
     {
@@ -1414,10 +1515,6 @@ CAResult_t CALEClientStopScan()
             OIC_LOG(ERROR, TAG, "CALEClientStopScanImpl has failed");
         }
     }
-    else
-    {
-        CALEClientSetScanFlag(false);
-    }
 
     if (isAttached)
     {
@@ -1427,13 +1524,6 @@ CAResult_t CALEClientStopScan()
     return ret;
 }
 
-void CALEClientSetScanFlag(bool flag)
-{
-    ca_mutex_lock(g_scanMutex);
-    g_isStartedScan = flag;
-    ca_mutex_unlock(g_scanMutex);
-}
-
 CAResult_t CALEClientStopScanImpl(JNIEnv *env, jobject callback)
 {
     OIC_LOG(DEBUG, TAG, "CALEClientStopScanImpl");
@@ -1461,6 +1551,7 @@ CAResult_t CALEClientStopScanImpl(JNIEnv *env, jobject callback)
     if (!jni_mid_getDefaultAdapter)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_getDefaultAdapter is null");
+        (*env)->DeleteLocalRef(env, jni_cid_BTAdapter);
         return CA_STATUS_FAILED;
     }
 
@@ -1471,6 +1562,7 @@ CAResult_t CALEClientStopScanImpl(JNIEnv *env, jobject callback)
     if (!jni_mid_stopLeScan)
     {
         OIC_LOG(ERROR, TAG, "stopLeScan: jni_mid_stopLeScan is null");
+        (*env)->DeleteLocalRef(env, jni_cid_BTAdapter);
         return CA_STATUS_FAILED;
     }
 
@@ -1480,33 +1572,156 @@ CAResult_t CALEClientStopScanImpl(JNIEnv *env, jobject callback)
     if (!jni_obj_BTAdapter)
     {
         OIC_LOG(ERROR, TAG, "jni_obj_BTAdapter is null");
+        (*env)->DeleteLocalRef(env, jni_cid_BTAdapter);
         return CA_STATUS_FAILED;
     }
 
-    OIC_LOG(DEBUG, TAG, "CALL API - request to stop LE Scan");
+    OIC_LOG(INFO, TAG, "CALL API - stopLeScan");
     // call start le scan method
     (*env)->CallVoidMethod(env, jni_obj_BTAdapter, jni_mid_stopLeScan, callback);
     if ((*env)->ExceptionCheck(env))
     {
         OIC_LOG(ERROR, TAG, "stopLeScan has failed");
+        (*env)->DeleteLocalRef(env, jni_cid_BTAdapter);
+        (*env)->DeleteLocalRef(env, jni_obj_BTAdapter);
         (*env)->ExceptionDescribe(env);
         (*env)->ExceptionClear(env);
         return CA_STATUS_FAILED;
     }
 
+    (*env)->DeleteLocalRef(env, jni_cid_BTAdapter);
+    (*env)->DeleteLocalRef(env, jni_obj_BTAdapter);
     return CA_STATUS_OK;
 }
 
-void CALEClientSetAutoConnectFlag(jboolean flag)
+CAResult_t CALEClientSetFlagToState(JNIEnv *env, jstring jni_address, jint state_idx, jboolean flag)
 {
-    OIC_LOG_V(INFO, TAG, "auto connect flag is set %d", flag);
-    g_autoConnectFlag = flag;
+    OIC_LOG(DEBUG, TAG, "IN - CALEClientSetFlagToState");
+    VERIFY_NON_NULL(env, TAG, "env");
+    VERIFY_NON_NULL(jni_address, TAG, "jni_address");
+
+    ca_mutex_lock(g_deviceStateListMutex);
+
+    char* address = (char*)(*env)->GetStringUTFChars(env, jni_address, NULL);
+    if (!address)
+    {
+        OIC_LOG(ERROR, TAG, "address is not available");
+        return CA_STATUS_FAILED;
+    }
+
+    if (CALEClientIsDeviceInList(address))
+    {
+        CALEState_t* curState = CALEClientGetStateInfo(address);
+        if(!curState)
+        {
+            OIC_LOG(ERROR, TAG, "curState is null");
+            (*env)->ReleaseStringUTFChars(env, jni_address, address);
+            ca_mutex_unlock(g_deviceStateListMutex);
+            return CA_STATUS_FAILED;
+        }
+        OIC_LOG_V(INFO, TAG, "%d flag is set : %d", state_idx, flag);
+
+        switch(state_idx)
+        {
+            case CA_LE_AUTO_CONNECT_FLAG:
+                curState->autoConnectFlag = flag;
+                break;
+            case CA_LE_DESCRIPTOR_FOUND:
+                curState->isDescriptorFound = flag;
+                break;
+            default:
+                break;
+        }
+    }
+
+    (*env)->ReleaseStringUTFChars(env, jni_address, address);
+    ca_mutex_unlock(g_deviceStateListMutex);
+    OIC_LOG(DEBUG, TAG, "OUT - CALEClientSetFlagToState");
+    return CA_STATUS_OK;
 }
 
-jboolean CALEClientGetAutoConnectFlag()
+jboolean CALEClientGetFlagFromState(JNIEnv *env, jstring jni_address, jint state_idx)
 {
-    OIC_LOG_V(INFO, TAG, "auto connect flag is %d", g_autoConnectFlag);
-    return g_autoConnectFlag;
+    OIC_LOG(DEBUG, TAG, "IN - CALEClientGetFlagFromState");
+    VERIFY_NON_NULL_RET(env, TAG, "env", false);
+    VERIFY_NON_NULL_RET(jni_address, TAG, "jni_address", false);
+
+    ca_mutex_lock(g_deviceStateListMutex);
+
+    char* address = (char*)(*env)->GetStringUTFChars(env, jni_address, NULL);
+    if (!address)
+    {
+        OIC_LOG(ERROR, TAG, "address is not available");
+        ca_mutex_unlock(g_deviceStateListMutex);
+        return JNI_FALSE;
+    }
+
+    CALEState_t* curState = CALEClientGetStateInfo(address);
+    (*env)->ReleaseStringUTFChars(env, jni_address, address);
+    if(!curState)
+    {
+        OIC_LOG(INFO, TAG, "there is no information. auto connect flag is false");
+        ca_mutex_unlock(g_deviceStateListMutex);
+        return JNI_FALSE;
+    }
+
+    jboolean ret = JNI_FALSE;
+    switch(state_idx)
+    {
+        case CA_LE_AUTO_CONNECT_FLAG:
+            ret = curState->autoConnectFlag;
+            break;
+        case CA_LE_DESCRIPTOR_FOUND:
+            ret = curState->isDescriptorFound;
+            break;
+        default:
+            break;
+    }
+    ca_mutex_unlock(g_deviceStateListMutex);
+
+    OIC_LOG_V(INFO, TAG, "%d flag is %d", state_idx, ret);
+    OIC_LOG(DEBUG, TAG, "OUT - CALEClientGetFlagFromState");
+    return ret;
+}
+
+CAResult_t CALEClientDirectConnect(JNIEnv *env, jobject bluetoothDevice, jboolean autoconnect)
+{
+    OIC_LOG(DEBUG, TAG, "CALEClientDirectConnect");
+    VERIFY_NON_NULL(env, TAG, "env is null");
+    VERIFY_NON_NULL(bluetoothDevice, TAG, "bluetoothDevice is null");
+
+    ca_mutex_lock(g_threadSendMutex);
+
+    jstring jni_address = CALEGetAddressFromBTDevice(env, bluetoothDevice);
+    if (!jni_address)
+    {
+        OIC_LOG(ERROR, TAG, "jni_address is not available");
+        ca_mutex_unlock(g_threadSendMutex);
+        return CA_STATUS_FAILED;
+    }
+
+    const char* address = (*env)->GetStringUTFChars(env, jni_address, NULL);
+    if (!address)
+    {
+        OIC_LOG(ERROR, TAG, "address is not available");
+        ca_mutex_unlock(g_threadSendMutex);
+        return CA_STATUS_FAILED;
+    }
+
+    CAResult_t res = CA_STATUS_OK;
+    if(CALEClientIsValidState(address, CA_LE_CONNECTION_STATE,
+                              STATE_DISCONNECTED))
+    {
+        jobject newGatt = CALEClientConnect(env, bluetoothDevice, autoconnect);
+        if (NULL == newGatt)
+        {
+            OIC_LOG(INFO, TAG, "newGatt is not available");
+            res = CA_STATUS_FAILED;
+        }
+    }
+    ca_mutex_unlock(g_threadSendMutex);
+
+    return res;
 }
 
 jobject CALEClientConnect(JNIEnv *env, jobject bluetoothDevice, jboolean autoconnect)
@@ -1574,6 +1789,12 @@ jobject CALEClientGattConnect(JNIEnv *env, jobject bluetoothDevice, jboolean aut
     VERIFY_NON_NULL_RET(env, TAG, "env is null", NULL);
     VERIFY_NON_NULL_RET(bluetoothDevice, TAG, "bluetoothDevice is null", NULL);
 
+    if (!g_leGattCallback)
+    {
+        OIC_LOG(INFO, TAG, "g_leGattCallback is null");
+        return NULL;
+    }
+
     if (!CALEIsEnableBTAdapter(env))
     {
         OIC_LOG(INFO, TAG, "BT adapter is not enabled");
@@ -1587,21 +1808,13 @@ jobject CALEClientGattConnect(JNIEnv *env, jobject bluetoothDevice, jboolean aut
         return NULL;
     }
 
-    // get BluetoothDevice class
-    OIC_LOG(DEBUG, TAG, "get BluetoothDevice class");
-    jclass jni_cid_BluetoothDevice = (*env)->FindClass(env, "android/bluetooth/BluetoothDevice");
-    if (!jni_cid_BluetoothDevice)
-    {
-        OIC_LOG(ERROR, TAG, "bleConnect: jni_cid_BluetoothDevice is null");
-        return NULL;
-    }
-
-    // get connectGatt method
-    OIC_LOG(DEBUG, TAG, "get connectGatt method");
-    jmethodID jni_mid_connectGatt = (*env)->GetMethodID(env, jni_cid_BluetoothDevice, "connectGatt",
-                                                        "(Landroid/content/Context;ZLandroid/"
-                                                        "bluetooth/BluetoothGattCallback;)"
-                                                        "Landroid/bluetooth/BluetoothGatt;");
+    // get BluetoothDevice method
+    OIC_LOG(DEBUG, TAG, "get BluetoothDevice method");
+    jmethodID jni_mid_connectGatt = CAGetJNIMethodID(env, "android/bluetooth/BluetoothDevice",
+                                                     "connectGatt",
+                                                     "(Landroid/content/Context;ZLandroid/"
+                                                     "bluetooth/BluetoothGattCallback;)"
+                                                     "Landroid/bluetooth/BluetoothGatt;");
     if (!jni_mid_connectGatt)
     {
         OIC_LOG(ERROR, TAG, "bleConnect: jni_mid_connectGatt is null");
@@ -1710,17 +1923,10 @@ CAResult_t CALEClientDisconnect(JNIEnv *env, jobject bluetoothGatt)
     VERIFY_NON_NULL(env, TAG, "env is null");
     VERIFY_NON_NULL(bluetoothGatt, TAG, "bluetoothGatt is null");
 
-    // get BluetoothGatt class
-    jclass jni_cid_BluetoothGatt = (*env)->FindClass(env, CLASSPATH_BT_GATT);
-    if (!jni_cid_BluetoothGatt)
-    {
-        OIC_LOG(ERROR, TAG, "jni_cid_BluetoothGatt is null");
-        return CA_STATUS_FAILED;
-    }
-
+    // get BluetoothGatt method
     OIC_LOG(DEBUG, TAG, "get gatt disconnect method");
-    jmethodID jni_mid_disconnectGatt = (*env)->GetMethodID(env, jni_cid_BluetoothGatt,
-                                                           "disconnect", "()V");
+    jmethodID jni_mid_disconnectGatt  = CAGetJNIMethodID(env, CLASSPATH_BT_GATT,
+                                                         "disconnect", "()V");
     if (!jni_mid_disconnectGatt)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_disconnectGatt is null");
@@ -1728,7 +1934,7 @@ CAResult_t CALEClientDisconnect(JNIEnv *env, jobject bluetoothGatt)
     }
 
     // call disconnect gatt method
-    OIC_LOG(DEBUG, TAG, "CALL API - request disconnect gatt");
+    OIC_LOG(INFO, TAG, "CALL API - disconnect");
     (*env)->CallVoidMethod(env, bluetoothGatt, jni_mid_disconnectGatt);
     if ((*env)->ExceptionCheck(env))
     {
@@ -1854,25 +2060,18 @@ CAResult_t CALEClientDiscoverServices(JNIEnv *env, jobject bluetoothGatt)
         return CA_ADAPTER_NOT_ENABLED;
     }
 
-    // get BluetoothGatt class
-    OIC_LOG(DEBUG, TAG, "get BluetoothGatt class");
-    jclass jni_cid_BluetoothGatt = (*env)->FindClass(env, CLASSPATH_BT_GATT);
-    if (!jni_cid_BluetoothGatt)
-    {
-        OIC_LOG(ERROR, TAG, "jni_cid_BluetoothGatt is null");
-        return CA_STATUS_FAILED;
-    }
-
-    OIC_LOG(DEBUG, TAG, "discovery gatt services method");
-    jmethodID jni_mid_discoverServices = (*env)->GetMethodID(env, jni_cid_BluetoothGatt,
-                                                             "discoverServices", "()Z");
+    // get BluetoothGatt.discoverServices method
+    OIC_LOG(DEBUG, TAG, "get BluetoothGatt.discoverServices method");
+    jmethodID jni_mid_discoverServices = CAGetJNIMethodID(env, CLASSPATH_BT_GATT,
+                                                          "discoverServices", "()Z");
     if (!jni_mid_discoverServices)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_discoverServices is null");
         return CA_STATUS_FAILED;
     }
+
     // call disconnect gatt method
-    OIC_LOG(DEBUG, TAG, "CALL API - request discovery gatt services");
+    OIC_LOG(INFO, TAG, "CALL API - discoverServices");
     jboolean ret = (*env)->CallBooleanMethod(env, bluetoothGatt, jni_mid_discoverServices);
     if (!ret)
     {
@@ -1888,7 +2087,7 @@ static void CALEWriteCharacteristicThread(void* object)
     VERIFY_NON_NULL_VOID(object, TAG, "object is null");
 
     bool isAttached = false;
-    JNIEnv* env;
+    JNIEnv* env = NULL;
     jint res = (*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6);
     if (JNI_OK != res)
     {
@@ -1918,9 +2117,49 @@ static void CALEWriteCharacteristicThread(void* object)
 
 CAResult_t CALESetValueAndWriteCharacteristic(JNIEnv* env, jobject gatt)
 {
+    OIC_LOG(DEBUG, TAG, "CALESetValueAndWriteCharacteristic");
+
     VERIFY_NON_NULL(gatt, TAG, "gatt is null");
     VERIFY_NON_NULL(env, TAG, "env is null");
 
+    jstring jni_address = CALEClientGetAddressFromGattObj(env, gatt);
+    if (!jni_address)
+    {
+        CALEClientSendFinish(env, gatt);
+        return CA_STATUS_FAILED;
+    }
+
+    const char* address = (*env)->GetStringUTFChars(env, jni_address, NULL);
+    if (!address)
+    {
+        CALEClientSendFinish(env, gatt);
+        return CA_STATUS_FAILED;
+    }
+
+    ca_mutex_lock(g_threadSendStateMutex);
+
+    if (CALEClientIsValidState(address, CA_LE_SEND_STATE, STATE_SENDING))
+    {
+        OIC_LOG(INFO, TAG, "current state is SENDING");
+        (*env)->ReleaseStringUTFChars(env, jni_address, address);
+        ca_mutex_unlock(g_threadSendStateMutex);
+        return CA_STATUS_OK;
+    }
+
+    if (CA_STATUS_OK != CALEClientUpdateDeviceState(address, CA_LE_SEND_STATE,
+                                                    STATE_SENDING))
+    {
+        OIC_LOG(ERROR, TAG, "CALEClientUpdateDeviceState has failed");
+        (*env)->ReleaseStringUTFChars(env, jni_address, address);
+        CALEClientSendFinish(env, gatt);
+        ca_mutex_unlock(g_threadSendStateMutex);
+        return CA_STATUS_FAILED;
+    }
+
+    (*env)->ReleaseStringUTFChars(env, jni_address, address);
+
+    ca_mutex_unlock(g_threadSendStateMutex);
+
     // send data
     jobject jni_obj_character = CALEClientCreateGattCharacteristic(env, gatt, g_sendBuffer);
     if (!jni_obj_character)
@@ -1956,6 +2195,8 @@ CAResult_t CALESetValueAndWriteCharacteristic(JNIEnv* env, jobject gatt)
     g_isSignalSetFlag = false;
     ca_mutex_unlock(g_threadWriteCharacteristicMutex);
 
+    CALEClientUpdateSendCnt(env);
+
     OIC_LOG(INFO, TAG, "writeCharacteristic success!!");
     return CA_STATUS_OK;
 }
@@ -1992,20 +2233,12 @@ CAResult_t CALEClientWriteCharacteristicImpl(JNIEnv *env, jobject bluetoothGatt,
         return CA_STATUS_FAILED;
     }
 
-    // get BluetoothGatt class
-    OIC_LOG(DEBUG, TAG, "get BluetoothGatt class");
-    jclass jni_cid_BluetoothGatt = (*env)->FindClass(env, CLASSPATH_BT_GATT);
-    if (!jni_cid_BluetoothGatt)
-    {
-        OIC_LOG(ERROR, TAG, "jni_cid_BluetoothGatt is null");
-        return CA_STATUS_FAILED;
-    }
-
+    // get BluetoothGatt.write characteristic method
     OIC_LOG(DEBUG, TAG, "write characteristic method");
-    jmethodID jni_mid_writeCharacteristic = (*env)->GetMethodID(env, jni_cid_BluetoothGatt,
-                                                                "writeCharacteristic",
-                                                                "(Landroid/bluetooth/"
-                                                                "BluetoothGattCharacteristic;)Z");
+    jmethodID jni_mid_writeCharacteristic = CAGetJNIMethodID(env, CLASSPATH_BT_GATT,
+                                                             "writeCharacteristic",
+                                                             "(Landroid/bluetooth/"
+                                                             "BluetoothGattCharacteristic;)Z");
     if (!jni_mid_writeCharacteristic)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_writeCharacteristic is null");
@@ -2013,7 +2246,7 @@ CAResult_t CALEClientWriteCharacteristicImpl(JNIEnv *env, jobject bluetoothGatt,
     }
 
     // call disconnect gatt method
-    OIC_LOG(DEBUG, TAG, "CALL API - request to write gatt characteristic");
+    OIC_LOG(INFO, TAG, "CALL API - writeCharacteristic");
     jboolean ret = (jboolean)(*env)->CallBooleanMethod(env, bluetoothGatt,
                                                        jni_mid_writeCharacteristic,
                                                        gattCharacteristic);
@@ -2041,13 +2274,6 @@ CAResult_t CALEClientReadCharacteristic(JNIEnv *env, jobject bluetoothGatt)
         return CA_STATUS_FAILED;
     }
 
-    jclass jni_cid_BluetoothGatt = (*env)->FindClass(env, CLASSPATH_BT_GATT);
-    if (!jni_cid_BluetoothGatt)
-    {
-        OIC_LOG(ERROR, TAG, "jni_cid_BluetoothGatt is null");
-        return CA_STATUS_FAILED;
-    }
-
     jstring jni_uuid = (*env)->NewStringUTF(env, OIC_GATT_CHARACTERISTIC_RESPONSE_UUID);
     if (!jni_uuid)
     {
@@ -2063,10 +2289,10 @@ CAResult_t CALEClientReadCharacteristic(JNIEnv *env, jobject bluetoothGatt)
     }
 
     OIC_LOG(DEBUG, TAG, "read characteristic method");
-    jmethodID jni_mid_readCharacteristic = (*env)->GetMethodID(env, jni_cid_BluetoothGatt,
-                                                               "readCharacteristic",
-                                                               "(Landroid/bluetooth/"
-                                                               "BluetoothGattCharacteristic;)Z");
+    jmethodID jni_mid_readCharacteristic = CAGetJNIMethodID(env, CLASSPATH_BT_GATT,
+                                                            "readCharacteristic",
+                                                            "(Landroid/bluetooth/"
+                                                            "BluetoothGattCharacteristic;)Z");
     if (!jni_mid_readCharacteristic)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_readCharacteristic is null");
@@ -2074,7 +2300,7 @@ CAResult_t CALEClientReadCharacteristic(JNIEnv *env, jobject bluetoothGatt)
     }
 
     // call disconnect gatt method
-    OIC_LOG(DEBUG, TAG, "CALL API - request to read gatt characteristic");
+    OIC_LOG(INFO, TAG, "CALL API - readCharacteristic");
     jboolean ret = (*env)->CallBooleanMethod(env, bluetoothGatt, jni_mid_readCharacteristic,
                                              jni_obj_GattCharacteristic);
     if (ret)
@@ -2103,35 +2329,28 @@ CAResult_t CALEClientSetCharacteristicNotification(JNIEnv *env, jobject bluetoot
         return CA_ADAPTER_NOT_ENABLED;
     }
 
-    // get BluetoothGatt class
+    // get BluetoothGatt.setCharacteristicNotification method
     OIC_LOG(DEBUG, TAG, "CALEClientSetCharacteristicNotification");
-    jclass jni_cid_BluetoothGatt = (*env)->FindClass(env, CLASSPATH_BT_GATT);
-    if (!jni_cid_BluetoothGatt)
-    {
-        OIC_LOG(ERROR, TAG, "jni_cid_BluetoothGatt is null");
-        return CA_STATUS_FAILED;
-    }
-
-    // set Characteristic Notification
-    jmethodID jni_mid_setNotification = (*env)->GetMethodID(env, jni_cid_BluetoothGatt,
-                                                            "setCharacteristicNotification",
-                                                            "(Landroid/bluetooth/"
-                                                            "BluetoothGattCharacteristic;Z)Z");
+    jmethodID jni_mid_setNotification = CAGetJNIMethodID(env, CLASSPATH_BT_GATT,
+                                                         "setCharacteristicNotification",
+                                                         "(Landroid/bluetooth/"
+                                                         "BluetoothGattCharacteristic;Z)Z");
     if (!jni_mid_setNotification)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_getService is null");
         return CA_STATUS_FAILED;
     }
 
+    OIC_LOG(INFO, TAG, "CALL API - setCharacteristicNotification");
     jboolean ret = (*env)->CallBooleanMethod(env, bluetoothGatt, jni_mid_setNotification,
                                              characteristic, JNI_TRUE);
     if (JNI_TRUE == ret)
     {
-        OIC_LOG(DEBUG, TAG, "CALL API - setCharacteristicNotification success");
+        OIC_LOG(DEBUG, TAG, "setCharacteristicNotification success");
     }
     else
     {
-        OIC_LOG(ERROR, TAG, "CALL API - setCharacteristicNotification has failed");
+        OIC_LOG(ERROR, TAG, "setCharacteristicNotification has failed");
         return CA_STATUS_FAILED;
     }
 
@@ -2150,18 +2369,12 @@ jobject CALEClientGetGattService(JNIEnv *env, jobject bluetoothGatt, jstring cha
         return NULL;
     }
 
-    // get BluetoothGatt class
-    OIC_LOG(DEBUG, TAG, "CALEClientGetGattService");
-    jclass jni_cid_BluetoothGatt = (*env)->FindClass(env, CLASSPATH_BT_GATT);
-    if (!jni_cid_BluetoothGatt)
-    {
-        OIC_LOG(ERROR, TAG, "jni_cid_BluetoothGatt is null");
-        return NULL;
-    }
-
-    jmethodID jni_mid_getService = (*env)->GetMethodID(
-            env, jni_cid_BluetoothGatt, "getService",
-            "(Ljava/util/UUID;)Landroid/bluetooth/BluetoothGattService;");
+    // get BluetoothGatt.getService method
+    OIC_LOG(DEBUG, TAG, "BluetoothGatt.getService");
+    jmethodID jni_mid_getService = CAGetJNIMethodID(env, CLASSPATH_BT_GATT,
+                                                    "getService",
+                                                    "(Ljava/util/UUID;)Landroid/bluetooth/"
+                                                    "BluetoothGattService;");
     if (!jni_mid_getService)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_getService is null");
@@ -2185,21 +2398,13 @@ jobject CALEClientGetGattService(JNIEnv *env, jobject bluetoothGatt, jstring cha
         return NULL;
     }
 
-    // get bluetooth gatt service class
-    jclass jni_cid_BluetoothGattService = (*env)->FindClass(
-            env, "android/bluetooth/BluetoothGattService");
-    if (!jni_cid_BluetoothGattService)
-    {
-        OIC_LOG(ERROR, TAG, "jni_cid_BluetoothGattService is null");
-        return NULL;
-    }
-
-    OIC_LOG(DEBUG, TAG, "get gatt getCharacteristic method");
-    jmethodID jni_mid_getCharacteristic = (*env)->GetMethodID(env, jni_cid_BluetoothGattService,
-                                                              "getCharacteristic",
-                                                              "(Ljava/util/UUID;)"
-                                                              "Landroid/bluetooth/"
-                                                              "BluetoothGattCharacteristic;");
+    // get bluetooth gatt service method
+    jmethodID jni_mid_getCharacteristic = CAGetJNIMethodID(env, "android/bluetooth/"
+                                                           "BluetoothGattService",
+                                                           "getCharacteristic",
+                                                           "(Ljava/util/UUID;)"
+                                                           "Landroid/bluetooth/"
+                                                           "BluetoothGattCharacteristic;");
     if (!jni_mid_getCharacteristic)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_getCharacteristic is null");
@@ -2322,17 +2527,9 @@ jbyteArray CALEClientGetValueFromCharacteristic(JNIEnv *env, jobject characteris
         return NULL;
     }
 
-    jclass jni_cid_BTGattCharacteristic = (*env)->FindClass(env, "android/bluetooth/"
-                                                            "BluetoothGattCharacteristic");
-    if (!jni_cid_BTGattCharacteristic)
-    {
-        OIC_LOG(ERROR, TAG, "jni_cid_BTGattCharacteristic is null");
-        return NULL;
-    }
-
-    OIC_LOG(DEBUG, TAG, "get value in Characteristic");
-    jmethodID jni_mid_getValue = (*env)->GetMethodID(env, jni_cid_BTGattCharacteristic, "getValue",
-                                                     "()[B");
+    jmethodID jni_mid_getValue  = CAGetJNIMethodID(env, "android/bluetooth/"
+                                                   "BluetoothGattCharacteristic",
+                                                   "getValue", "()[B");
     if (!jni_mid_getValue)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_getValue is null");
@@ -2353,7 +2550,7 @@ CAResult_t CALEClientCreateUUIDList()
     }
 
     bool isAttached = false;
-    JNIEnv* env;
+    JNIEnv* env = NULL;
     jint res = (*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6);
     if (JNI_OK != res)
     {
@@ -2426,19 +2623,11 @@ CAResult_t CALEClientSetUUIDToDescriptor(JNIEnv *env, jobject bluetoothGatt,
     }
 
     OIC_LOG(DEBUG, TAG, "CALEClientSetUUIDToDescriptor");
-    jclass jni_cid_BTGattCharacteristic = (*env)->FindClass(env, "android/bluetooth/"
-                                                            "BluetoothGattCharacteristic");
-    if (!jni_cid_BTGattCharacteristic)
-    {
-        OIC_LOG(ERROR, TAG, "jni_cid_BTGattCharacteristic is null");
-        return CA_STATUS_FAILED;
-    }
-
-    OIC_LOG(DEBUG, TAG, "set value in Characteristic");
-    jmethodID jni_mid_getDescriptor = (*env)->GetMethodID(env, jni_cid_BTGattCharacteristic,
-                                                          "getDescriptor",
-                                                          "(Ljava/util/UUID;)Landroid/bluetooth/"
-                                                          "BluetoothGattDescriptor;");
+    jmethodID jni_mid_getDescriptor  = CAGetJNIMethodID(env, "android/bluetooth/"
+                                                        "BluetoothGattCharacteristic",
+                                                        "getDescriptor",
+                                                        "(Ljava/util/UUID;)Landroid/bluetooth/"
+                                                        "BluetoothGattDescriptor;");
     if (!jni_mid_getDescriptor)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_getDescriptor is null");
@@ -2500,24 +2689,17 @@ CAResult_t CALEClientSetUUIDToDescriptor(JNIEnv *env, jobject bluetoothGatt,
         return CA_STATUS_FAILED;
     }
 
-    jclass jni_cid_gatt = (*env)->FindClass(env, "android/bluetooth/BluetoothGatt");
-    if (!jni_cid_gatt)
-    {
-        OIC_LOG(ERROR, TAG, "jni_cid_gatt is null");
-        return CA_STATUS_FAILED;
-    }
-
-    OIC_LOG(DEBUG, TAG, "write Descriptor in gatt object");
-    jmethodID jni_mid_writeDescriptor = (*env)->GetMethodID(env, jni_cid_gatt, "writeDescriptor",
-                                                            "(Landroid/bluetooth/"
-                                                            "BluetoothGattDescriptor;)Z");
+    jmethodID jni_mid_writeDescriptor  = CAGetJNIMethodID(env, "android/bluetooth/BluetoothGatt",
+                                                          "writeDescriptor",
+                                                          "(Landroid/bluetooth/"
+                                                          "BluetoothGattDescriptor;)Z");
     if (!jni_mid_writeDescriptor)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_writeDescriptor is null");
         return CA_STATUS_FAILED;
     }
 
-    OIC_LOG(DEBUG, TAG, "request to write descriptor");
+    OIC_LOG(INFO, TAG, "CALL API - writeDescriptor");
     jboolean jni_ret = (*env)->CallBooleanMethod(env, bluetoothGatt, jni_mid_writeDescriptor,
                                                  jni_obj_descriptor);
     if (jni_ret)
@@ -2575,6 +2757,7 @@ CAResult_t CALEClientAddScanDeviceToList(JNIEnv *env, jobject device)
     if (!remoteAddress)
     {
         OIC_LOG(ERROR, TAG, "remoteAddress is null");
+        (*env)->DeleteLocalRef(env, jni_remoteAddress);
         ca_mutex_unlock(g_deviceListMutex);
         return CA_STATUS_FAILED;
     }
@@ -2584,9 +2767,10 @@ CAResult_t CALEClientAddScanDeviceToList(JNIEnv *env, jobject device)
         jobject gdevice = (*env)->NewGlobalRef(env, device);
         u_arraylist_add(g_deviceList, gdevice);
         ca_cond_signal(g_deviceDescCond);
-        OIC_LOG_V(DEBUG, TAG, "Added this BT Device[%s] in the List", remoteAddress);
+        OIC_LOG_V(DEBUG, TAG, "Added a new BT Device in deviceList [%s]", remoteAddress);
     }
     (*env)->ReleaseStringUTFChars(env, jni_remoteAddress, remoteAddress);
+    (*env)->DeleteLocalRef(env, jni_remoteAddress);
 
     ca_mutex_unlock(g_deviceListMutex);
 
@@ -2595,7 +2779,7 @@ CAResult_t CALEClientAddScanDeviceToList(JNIEnv *env, jobject device)
 
 bool CALEClientIsDeviceInScanDeviceList(JNIEnv *env, const char* remoteAddress)
 {
-    VERIFY_NON_NULL_RET(env, TAG, "env is null", NULL);
+    VERIFY_NON_NULL_RET(env, TAG, "env is null", true);
     VERIFY_NON_NULL_RET(remoteAddress, TAG, "remoteAddress is null", true);
 
     if (!g_deviceList)
@@ -2625,19 +2809,22 @@ bool CALEClientIsDeviceInScanDeviceList(JNIEnv *env, const char* remoteAddress)
         if (!setAddress)
         {
             OIC_LOG(ERROR, TAG, "setAddress is null");
+            (*env)->DeleteLocalRef(env, jni_setAddress);
             return true;
         }
 
         if (!strcmp(remoteAddress, setAddress))
         {
             (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
+            (*env)->DeleteLocalRef(env, jni_setAddress);
             return true;
         }
 
         (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
+        (*env)->DeleteLocalRef(env, jni_setAddress);
     }
 
-    OIC_LOG(DEBUG, TAG, "there are no the device in list. we can add");
+    OIC_LOG_V(DEBUG, TAG, "[%s] doesn't exist in scanned device list", remoteAddress);
 
     return false;
 }
@@ -2666,6 +2853,7 @@ CAResult_t CALEClientRemoveAllScanDevices(JNIEnv *env)
             continue;
         }
         (*env)->DeleteGlobalRef(env, jarrayObj);
+        jarrayObj = NULL;
     }
 
     OICFree(g_deviceList);
@@ -2730,6 +2918,7 @@ CAResult_t CALEClientRemoveDeviceInScanDeviceList(JNIEnv *env, jstring address)
         {
             OIC_LOG_V(DEBUG, TAG, "remove object : %s", remoteAddress);
             (*env)->DeleteGlobalRef(env, jarrayObj);
+            jarrayObj = NULL;
             (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
             (*env)->ReleaseStringUTFChars(env, address, remoteAddress);
 
@@ -2758,7 +2947,7 @@ CAResult_t CALEClientRemoveDeviceInScanDeviceList(JNIEnv *env, jstring address)
 
 CAResult_t CALEClientAddGattobjToList(JNIEnv *env, jobject gatt)
 {
-    OIC_LOG(INFO, TAG, "CALEClientAddGattobjToList");
+    OIC_LOG(DEBUG, TAG, "CALEClientAddGattobjToList");
     VERIFY_NON_NULL(env, TAG, "env is null");
     VERIFY_NON_NULL(gatt, TAG, "gatt is null");
 
@@ -2787,12 +2976,12 @@ CAResult_t CALEClientAddGattobjToList(JNIEnv *env, jobject gatt)
         return CA_STATUS_FAILED;
     }
 
-    OIC_LOG_V(INFO, TAG, "remote address : %s", remoteAddress);
+    OIC_LOG_V(DEBUG, TAG, "remote address : %s", remoteAddress);
     if (!CALEClientIsGattObjInList(env, remoteAddress))
     {
         jobject newGatt = (*env)->NewGlobalRef(env, gatt);
         u_arraylist_add(g_gattObjectList, newGatt);
-        OIC_LOG(INFO, TAG, "Set GATT Object to Array as Element");
+        OIC_LOG(INFO, TAG, "added a newGatt object to gattObjectList");
     }
 
     (*env)->ReleaseStringUTFChars(env, jni_remoteAddress, remoteAddress);
@@ -2920,6 +3109,7 @@ CAResult_t CALEClientRemoveAllGattObjs(JNIEnv *env)
             continue;
         }
         (*env)->DeleteGlobalRef(env, jarrayObj);
+        jarrayObj = NULL;
     }
 
     OICFree(g_gattObjectList);
@@ -2992,6 +3182,7 @@ CAResult_t CALEClientRemoveGattObj(JNIEnv *env, jobject gatt)
         {
             OIC_LOG_V(DEBUG, TAG, "remove object : %s", remoteAddress);
             (*env)->DeleteGlobalRef(env, jarrayObj);
+            jarrayObj = NULL;
             (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
             (*env)->ReleaseStringUTFChars(env, jni_remoteAddress, remoteAddress);
 
@@ -3067,7 +3258,7 @@ CAResult_t CALEClientRemoveGattObjForAddr(JNIEnv *env, jstring addr)
         {
             OIC_LOG_V(DEBUG, TAG, "remove object : %s", remoteAddress);
             (*env)->DeleteGlobalRef(env, jarrayObj);
-
+            jarrayObj = NULL;
             (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
             (*env)->ReleaseStringUTFChars(env, addr, remoteAddress);
             if (NULL == u_arraylist_remove(g_gattObjectList, index))
@@ -3090,7 +3281,7 @@ CAResult_t CALEClientRemoveGattObjForAddr(JNIEnv *env, jstring addr)
 
 jstring CALEClientGetLEAddressFromBTDevice(JNIEnv *env, jobject bluetoothDevice)
 {
-    OIC_LOG(DEBUG, TAG, "IN - CALEClientGetLEAddressFromBTDevice");
+    OIC_LOG(DEBUG, TAG, "CALEClientGetLEAddressFromBTDevice");
 
     VERIFY_NON_NULL_RET(env, TAG, "env", NULL);
     VERIFY_NON_NULL_RET(bluetoothDevice, TAG, "bluetoothDevice", NULL);
@@ -3111,16 +3302,8 @@ jstring CALEClientGetLEAddressFromBTDevice(JNIEnv *env, jobject bluetoothDevice)
     }
 
     // get method ID of getDevice()
-    jclass jni_cid_gattdevice_list = (*env)->FindClass(env, CLASSPATH_BT_GATT);
-    if (!jni_cid_gattdevice_list)
-    {
-        OIC_LOG(ERROR, TAG, "jni_cid_gattdevice_list is null");
-        (*env)->ReleaseStringUTFChars(env, jni_btTargetAddress, targetAddress);
-        return NULL;
-    }
-
-    jmethodID jni_mid_getDevice = (*env)->GetMethodID(env, jni_cid_gattdevice_list, "getDevice",
-                                                      METHODID_BT_DEVICE);
+    jmethodID jni_mid_getDevice = CAGetJNIMethodID(env, CLASSPATH_BT_GATT,
+                                                   "getDevice", METHODID_BT_DEVICE);
     if (!jni_mid_getDevice)
     {
         OIC_LOG(ERROR, TAG, "jni_mid_getDevice is null");
@@ -3128,21 +3311,27 @@ jstring CALEClientGetLEAddressFromBTDevice(JNIEnv *env, jobject bluetoothDevice)
         return NULL;
     }
 
+    ca_mutex_lock(g_gattObjectMutex);
+
     size_t length = u_arraylist_length(g_gattObjectList);
+    OIC_LOG_V(DEBUG, TAG, "length of gattObjectList : %d", length);
+    OIC_LOG_V(DEBUG, TAG, "targetAddress : %s", targetAddress);
+
     for (size_t index = 0; index < length; index++)
     {
         jobject jarrayObj = (jobject) u_arraylist_get(g_gattObjectList, index);
         if (!jarrayObj)
         {
+            ca_mutex_unlock(g_gattObjectMutex);
             OIC_LOG(ERROR, TAG, "jarrayObj is null");
             (*env)->ReleaseStringUTFChars(env, jni_btTargetAddress, targetAddress);
             return NULL;
         }
 
-        OIC_LOG(DEBUG, TAG, "CALL API - bluetoothGatt.getDevice()");
         jobject jni_obj_device = (*env)->CallObjectMethod(env, jarrayObj, jni_mid_getDevice);
         if (!jni_obj_device)
         {
+            ca_mutex_unlock(g_gattObjectMutex);
             OIC_LOG(ERROR, TAG, "jni_obj_device is null");
             (*env)->ReleaseStringUTFChars(env, jni_btTargetAddress, targetAddress);
             return NULL;
@@ -3151,6 +3340,7 @@ jstring CALEClientGetLEAddressFromBTDevice(JNIEnv *env, jobject bluetoothDevice)
         jstring jni_btAddress = CALEGetAddressFromBTDevice(env, jni_obj_device);
         if (!jni_btAddress)
         {
+            ca_mutex_unlock(g_gattObjectMutex);
             OIC_LOG(ERROR, TAG, "CALEGetAddressFromBTDevice has failed");
             (*env)->ReleaseStringUTFChars(env, jni_btTargetAddress, targetAddress);
             return NULL;
@@ -3159,13 +3349,13 @@ jstring CALEClientGetLEAddressFromBTDevice(JNIEnv *env, jobject bluetoothDevice)
         const char* btAddress = (*env)->GetStringUTFChars(env, jni_btAddress, NULL);
         if (!btAddress)
         {
+            ca_mutex_unlock(g_gattObjectMutex);
             OIC_LOG(ERROR, TAG, "btAddress is not available");
             (*env)->ReleaseStringUTFChars(env, jni_btTargetAddress, targetAddress);
             return NULL;
         }
 
-        OIC_LOG_V(DEBUG, TAG, "targetAddress : %s", targetAddress);
-        OIC_LOG_V(DEBUG, TAG, "btAddress : %s", btAddress);
+        OIC_LOG_V(DEBUG, TAG, "btAddress : %s (idx: %d)", btAddress, index);
         if (!strcmp(targetAddress, btAddress))
         {
             OIC_LOG(DEBUG, TAG, "Found Gatt object from BT device");
@@ -3176,6 +3366,7 @@ jstring CALEClientGetLEAddressFromBTDevice(JNIEnv *env, jobject bluetoothDevice)
             {
                 OIC_LOG(ERROR, TAG, "jni_LEAddress is null");
             }
+            ca_mutex_unlock(g_gattObjectMutex);
             (*env)->ReleaseStringUTFChars(env, jni_btTargetAddress, targetAddress);
             (*env)->ReleaseStringUTFChars(env, jni_btAddress, btAddress);
             (*env)->DeleteLocalRef(env, jni_btAddress);
@@ -3186,8 +3377,10 @@ jstring CALEClientGetLEAddressFromBTDevice(JNIEnv *env, jobject bluetoothDevice)
         (*env)->DeleteLocalRef(env, jni_btAddress);
         (*env)->DeleteLocalRef(env, jni_obj_device);
     }
+    ca_mutex_unlock(g_gattObjectMutex);
 
-    OIC_LOG(DEBUG, TAG, "OUT - CALEClientGetLEAddressFromBTDevice");
+    (*env)->ReleaseStringUTFChars(env, jni_btTargetAddress, targetAddress);
+    OIC_LOG_V(DEBUG, TAG, "[%s] doesn't exist in gattObjectList", targetAddress);
     return NULL;
 }
 
@@ -3195,48 +3388,24 @@ jstring CALEClientGetLEAddressFromBTDevice(JNIEnv *env, jobject bluetoothDevice)
  * BT State List
  */
 
-CAResult_t CALEClientUpdateDeviceState(const char* address, uint32_t connectedState,
-                                       uint16_t notificationState, uint16_t sendState)
+CAResult_t CALEClientUpdateDeviceState(const char* address, uint16_t state_type,
+                                       uint16_t target_state)
 {
     VERIFY_NON_NULL(address, TAG, "address is null");
-
-    CALEState_t *newstate = (CALEState_t*) OICMalloc(sizeof(CALEState_t));
-    if (!newstate)
-    {
-        OIC_LOG(ERROR, TAG, "out of memory");
-        return CA_MEMORY_ALLOC_FAILED;
-    }
-
-    if (strlen(address) > CA_MACADDR_SIZE)
-    {
-        OIC_LOG(ERROR, TAG, "address is not proper");
-        OICFree(newstate);
-        return CA_STATUS_FAILED;
-    }
-
-    OICStrcpy(newstate->address, sizeof(newstate->address), address);
-    newstate->connectedState = connectedState;
-    newstate->notificationState = notificationState;
-    newstate->sendState = sendState;
-    return CALEClientAddDeviceStateToList(newstate);
-}
-
-CAResult_t CALEClientAddDeviceStateToList(CALEState_t* state)
-{
-    VERIFY_NON_NULL(state, TAG, "state is null");
-
-    ca_mutex_lock(g_deviceStateListMutex);
+    VERIFY_NON_NULL(address, TAG, "state_type is null");
+    VERIFY_NON_NULL(address, TAG, "target_state is null");
 
     if (!g_deviceStateList)
     {
         OIC_LOG(ERROR, TAG, "gdevice_list is null");
-        ca_mutex_unlock(g_deviceStateListMutex);
         return CA_STATUS_FAILED;
     }
 
-    if (CALEClientIsDeviceInList(state->address))
+    ca_mutex_lock(g_deviceStateListMutex);
+
+    if (CALEClientIsDeviceInList(address))
     {
-        CALEState_t* curState = CALEClientGetStateInfo(state->address);
+        CALEState_t* curState = CALEClientGetStateInfo(address);
         if(!curState)
         {
             OIC_LOG(ERROR, TAG, "curState is null");
@@ -3244,25 +3413,61 @@ CAResult_t CALEClientAddDeviceStateToList(CALEState_t* state)
             return CA_STATUS_FAILED;
         }
 
-        if (STATE_CHARACTER_NO_CHANGE == state->notificationState)
+        switch(state_type)
         {
-            state->notificationState = curState->notificationState;
+            case CA_LE_CONNECTION_STATE:
+                curState->connectedState = target_state;
+                break;
+            case CA_LE_SEND_STATE:
+                curState->sendState = target_state;
+                break;
+            default:
+                break;
+        }
+        OIC_LOG_V(INFO, TAG, "update state - addr : %s, conn : %d, send : %d, ACFlag : %d",
+                  curState->address, curState->connectedState, curState->sendState,
+                  curState->autoConnectFlag);
+    }
+    else /** state is added newly **/
+    {
+        if (strlen(address) > CA_MACADDR_SIZE)
+        {
+            OIC_LOG(ERROR, TAG, "address is not proper");
+            ca_mutex_unlock(g_deviceStateListMutex);
+            return CA_STATUS_INVALID_PARAM;
         }
 
-        // delete previous state for update new state
-        CAResult_t res = CALEClientRemoveDeviceState(state->address);
-        if (CA_STATUS_OK != res)
+        CALEState_t *newstate = (CALEState_t*) OICCalloc(1, sizeof(*newstate));
+        if (!newstate)
         {
-            OIC_LOG(ERROR, TAG, "CALEClientRemoveDeviceState has failed");
+            OIC_LOG(ERROR, TAG, "out of memory");
             ca_mutex_unlock(g_deviceStateListMutex);
-            return res;
+            return CA_MEMORY_ALLOC_FAILED;
         }
-    }
-    u_arraylist_add(g_deviceStateList, state); // update new state
-    OIC_LOG_V(INFO, TAG, "Set State Info to List : %d, %d, %s",
-              state->connectedState, state->notificationState, state->address);
 
+        OICStrcpy(newstate->address, sizeof(newstate->address), address);
+
+        switch(state_type)
+        {
+            case CA_LE_CONNECTION_STATE:
+                newstate->connectedState = target_state;
+                newstate->sendState = STATE_SEND_NONE;
+                break;
+            case CA_LE_SEND_STATE:
+                newstate->connectedState = STATE_DISCONNECTED;
+                newstate->sendState = target_state;
+                break;
+            default:
+                break;
+        }
+        OIC_LOG_V(INFO, TAG, "add a new state to List - addr : %s, "
+                  "conn : %d, send : %d, ACFlag : %d",
+                  newstate->address, newstate->connectedState, newstate->sendState,
+                  newstate->autoConnectFlag);
+        u_arraylist_add(g_deviceStateList, newstate); // update new state
+    }
     ca_mutex_unlock(g_deviceStateListMutex);
+
     return CA_STATUS_OK;
 }
 
@@ -3332,6 +3537,38 @@ CAResult_t CALEClientRemoveAllDeviceState()
     return CA_STATUS_OK;
 }
 
+CAResult_t CALEClientResetDeviceStateForAll()
+{
+    OIC_LOG(DEBUG, TAG, "CALEClientResetDeviceStateForAll");
+
+    ca_mutex_lock(g_deviceStateListMutex);
+    if (!g_deviceStateList)
+    {
+        OIC_LOG(ERROR, TAG, "g_deviceStateList is null");
+        ca_mutex_unlock(g_deviceStateListMutex);
+        return CA_STATUS_FAILED;
+    }
+
+    size_t length = u_arraylist_length(g_deviceStateList);
+    for (size_t index = 0; index < length; index++)
+    {
+        CALEState_t* state = (CALEState_t*) u_arraylist_get(g_deviceStateList, index);
+        if (!state)
+        {
+            OIC_LOG(ERROR, TAG, "jarrayObj is null");
+            continue;
+        }
+
+        // autoConnectFlag value will be not changed,
+        // since it has reset only termination case.
+        state->connectedState = STATE_DISCONNECTED;
+        state->sendState = STATE_SEND_NONE;
+    }
+    ca_mutex_unlock(g_deviceStateListMutex);
+
+    return CA_STATUS_OK;
+}
+
 CAResult_t CALEClientRemoveDeviceState(const char* remoteAddress)
 {
     OIC_LOG(DEBUG, TAG, "CALEClientRemoveDeviceState");
@@ -3375,7 +3612,6 @@ CAResult_t CALEClientRemoveDeviceState(const char* remoteAddress)
 
 CALEState_t* CALEClientGetStateInfo(const char* remoteAddress)
 {
-    OIC_LOG(DEBUG, TAG, "CALEClientGetStateInfo");
     VERIFY_NON_NULL_RET(remoteAddress, TAG, "remoteAddress is null", NULL);
 
     if (!g_deviceStateList)
@@ -3385,7 +3621,8 @@ CALEState_t* CALEClientGetStateInfo(const char* remoteAddress)
     }
 
     uint32_t length = u_arraylist_length(g_deviceStateList);
-    OIC_LOG_V(DEBUG, TAG, "CALEClientGetStateInfo : %d", length);
+    OIC_LOG_V(DEBUG, TAG, "length of deviceStateList : %d", length);
+    OIC_LOG_V(DEBUG, TAG, "target address : %s", remoteAddress);
 
     for (uint32_t index = 0; index < length; index++)
     {
@@ -3396,21 +3633,24 @@ CALEState_t* CALEClientGetStateInfo(const char* remoteAddress)
             continue;
         }
 
-        OIC_LOG_V(DEBUG, TAG, "target address : %s", remoteAddress);
-        OIC_LOG_V(DEBUG, TAG, "state address : %s", state->address);
+        OIC_LOG_V(DEBUG, TAG, "state address : %s (idx: %d)", state->address, index);
 
         if (!strcmp(state->address, remoteAddress))
         {
-            OIC_LOG_V(DEBUG, TAG, "get state : %s", remoteAddress);
+            OIC_LOG(DEBUG, TAG, "found state");
             return state;
         }
     }
+
+    OIC_LOG_V(DEBUG, TAG, "[%s] doesn't exist in deviceStateList", remoteAddress);
     return NULL;
 }
 
-bool CALEClientIsConnectedDevice(const char* remoteAddress)
+bool CALEClientIsValidState(const char* remoteAddress, uint16_t state_type,
+                             uint16_t target_state)
 {
-    OIC_LOG(DEBUG, TAG, "CALEClientIsConnectedDevice");
+    OIC_LOG_V(DEBUG, TAG, "CALEClientIsValidState : type[%d], target state[%d]",
+              state_type, target_state);
     VERIFY_NON_NULL_RET(remoteAddress, TAG, "remoteAddress is null", false);
 
     ca_mutex_lock(g_deviceStateListMutex);
@@ -3421,74 +3661,36 @@ bool CALEClientIsConnectedDevice(const char* remoteAddress)
         return false;
     }
 
-    uint32_t length = u_arraylist_length(g_deviceStateList);
-    for (uint32_t index = 0; index < length; index++)
+    CALEState_t* state = CALEClientGetStateInfo(remoteAddress);
+    if (NULL == state)
     {
-        CALEState_t* state = (CALEState_t*) u_arraylist_get(g_deviceStateList, index);
-        if (!state)
-        {
-            OIC_LOG(ERROR, TAG, "CALEState_t object is null");
-            continue;
-        }
-
-        if (!strcmp(state->address, remoteAddress))
-        {
-            OIC_LOG(DEBUG, TAG, "check whether it is connected or not");
-
-            if (STATE_CONNECTED == state->connectedState)
-            {
-                ca_mutex_unlock(g_deviceStateListMutex);
-                return true;
-            }
-            else
-            {
-                ca_mutex_unlock(g_deviceStateListMutex);
-                return false;
-            }
-        }
+        OIC_LOG(ERROR, TAG, "state is null");
+        ca_mutex_unlock(g_deviceStateListMutex);
+        return false;
     }
-    ca_mutex_unlock(g_deviceStateListMutex);
-    return false;
-}
 
-bool CALEClientIsSetCharacteristic(const char* remoteAddress)
-{
-    OIC_LOG(DEBUG, TAG, "CALEClientIsSetCharacteristic");
-    VERIFY_NON_NULL_RET(remoteAddress, TAG, "remoteAddress is null", false);
+    uint16_t curValue = 0;
+    switch(state_type)
+    {
+        case CA_LE_CONNECTION_STATE:
+            curValue = state->connectedState;
+            break;
+        case CA_LE_SEND_STATE:
+            curValue = state->sendState;
+            break;
+        default:
+            break;
+    }
 
-    ca_mutex_lock(g_deviceStateListMutex);
-    if (!g_deviceStateList)
+    if (target_state == curValue)
     {
-        OIC_LOG(ERROR, TAG, "g_deviceStateList is null");
         ca_mutex_unlock(g_deviceStateListMutex);
-        return false;
+        return true;
     }
-
-    uint32_t length = u_arraylist_length(g_deviceStateList);
-    for (uint32_t index = 0; index < length; index++)
+    else
     {
-        CALEState_t* state = (CALEState_t*) u_arraylist_get(g_deviceStateList, index);
-        if (!state)
-        {
-            OIC_LOG(ERROR, TAG, "CALEState_t object is null");
-            continue;
-        }
-
-        if (!strcmp(state->address, remoteAddress))
-        {
-            OIC_LOG_V(DEBUG, TAG, "check whether it was set or not:%d", state->notificationState);
-
-            if (STATE_CHARACTER_SET == state->notificationState)
-            {
-                ca_mutex_unlock(g_deviceStateListMutex);
-                return true;
-            }
-            else
-            {
-                ca_mutex_unlock(g_deviceStateListMutex);
-                return false;
-            }
-        }
+        ca_mutex_unlock(g_deviceStateListMutex);
+        return false;
     }
 
     ca_mutex_unlock(g_deviceStateListMutex);
@@ -3637,20 +3839,40 @@ CAResult_t CALEClientInitGattMutexVaraibles()
         }
     }
 
-    if (NULL == g_scanMutex)
+    if (NULL == g_threadWriteCharacteristicMutex)
     {
-        g_scanMutex = ca_mutex_new();
-        if (NULL == g_scanMutex)
+        g_threadWriteCharacteristicMutex = ca_mutex_new();
+        if (NULL == g_threadWriteCharacteristicMutex)
         {
             OIC_LOG(ERROR, TAG, "ca_mutex_new has failed");
             return CA_STATUS_FAILED;
         }
     }
 
-    if (NULL == g_threadWriteCharacteristicMutex)
+    if (NULL == g_deviceScanRetryDelayMutex)
     {
-        g_threadWriteCharacteristicMutex = ca_mutex_new();
-        if (NULL == g_threadWriteCharacteristicMutex)
+        g_deviceScanRetryDelayMutex = ca_mutex_new();
+        if (NULL == g_deviceScanRetryDelayMutex)
+        {
+            OIC_LOG(ERROR, TAG, "ca_mutex_new has failed");
+            return CA_STATUS_FAILED;
+        }
+    }
+
+    if (NULL == g_threadSendStateMutex)
+    {
+        g_threadSendStateMutex = ca_mutex_new();
+        if (NULL == g_threadSendStateMutex)
+        {
+            OIC_LOG(ERROR, TAG, "ca_mutex_new has failed");
+            return CA_STATUS_FAILED;
+        }
+    }
+
+    if (NULL == g_threadScanIntervalMutex)
+    {
+        g_threadScanIntervalMutex = ca_mutex_new();
+        if (NULL == g_threadScanIntervalMutex)
         {
             OIC_LOG(ERROR, TAG, "ca_mutex_new has failed");
             return CA_STATUS_FAILED;
@@ -3680,11 +3902,17 @@ void CALEClientTerminateGattMutexVariables()
     ca_mutex_free(g_SendFinishMutex);
     g_SendFinishMutex = NULL;
 
-    ca_mutex_free(g_scanMutex);
-    g_scanMutex = NULL;
-
     ca_mutex_free(g_threadWriteCharacteristicMutex);
     g_threadWriteCharacteristicMutex = NULL;
+
+    ca_mutex_free(g_deviceScanRetryDelayMutex);
+    g_deviceScanRetryDelayMutex = NULL;
+
+    ca_mutex_free(g_threadSendStateMutex);
+    g_threadSendStateMutex = NULL;
+
+    ca_mutex_free(g_threadScanIntervalMutex);
+    g_threadScanIntervalMutex = NULL;
 }
 
 void CALEClientSetSendFinishFlag(bool flag)
@@ -3702,17 +3930,36 @@ void CALEClientSetSendFinishFlag(bool flag)
 
 CAResult_t CAStartLEGattClient()
 {
-    CAResult_t res = CALEClientStartMulticastServer();
-    if (CA_STATUS_OK != res)
+    // init mutex for send logic
+    if (!g_deviceDescCond)
     {
-        OIC_LOG(ERROR, TAG, "CALEClientStartMulticastServer has failed");
+        g_deviceDescCond = ca_cond_new();
     }
-    else
+
+    if (!g_threadCond)
     {
-        g_isStartedLEClient = true;
+        g_threadCond = ca_cond_new();
     }
 
-    return res;
+    if (!g_threadWriteCharacteristicCond)
+    {
+        g_threadWriteCharacteristicCond = ca_cond_new();
+    }
+
+    if (!g_threadScanIntervalCond)
+    {
+        g_threadScanIntervalCond = ca_cond_new();
+    }
+
+    CAResult_t ret = CALEClientStartScanWithInterval();
+    if (CA_STATUS_OK != ret)
+    {
+        OIC_LOG(ERROR, TAG, "CALEClientStartScanWithInterval has failed");
+        return ret;
+    }
+
+    g_isStartedLEClient = true;
+    return CA_STATUS_OK;
 }
 
 void CAStopLEGattClient()
@@ -3726,7 +3973,7 @@ void CAStopLEGattClient()
     }
 
     bool isAttached = false;
-    JNIEnv* env;
+    JNIEnv* env = NULL;
     jint res = (*g_jvm)->GetEnv(g_jvm, (void**) &env, JNI_VERSION_1_6);
     if (JNI_OK != res)
     {
@@ -3747,20 +3994,41 @@ void CAStopLEGattClient()
         OIC_LOG(ERROR, TAG, "CALEClientDisconnectAll has failed");
     }
 
-    ret = CALEClientStopScan();
-    if(CA_STATUS_OK != ret)
-    {
-        OIC_LOG(ERROR, TAG, "CALEClientStopScan has failed");
-    }
+    CALEClientStopScanWithInterval();
 
     ca_mutex_lock(g_threadMutex);
+    OIC_LOG(DEBUG, TAG, "signal - connection cond");
     ca_cond_signal(g_threadCond);
+    CALEClientSetSendFinishFlag(true);
     ca_mutex_unlock(g_threadMutex);
 
     ca_mutex_lock(g_threadWriteCharacteristicMutex);
+    OIC_LOG(DEBUG, TAG, "signal - WriteCharacteristic cond");
     ca_cond_signal(g_threadWriteCharacteristicCond);
     ca_mutex_unlock(g_threadWriteCharacteristicMutex);
 
+    ca_mutex_lock(g_deviceScanRetryDelayMutex);
+    OIC_LOG(DEBUG, TAG, "signal - delay cond");
+    ca_cond_signal(g_deviceScanRetryDelayCond);
+    ca_mutex_unlock(g_deviceScanRetryDelayMutex);
+
+    ca_mutex_lock(g_threadScanIntervalMutex);
+    OIC_LOG(DEBUG, TAG, "signal - delay cond");
+    ca_cond_signal(g_threadScanIntervalCond);
+    ca_mutex_unlock(g_threadScanIntervalMutex);
+
+    ca_cond_free(g_deviceDescCond);
+    ca_cond_free(g_threadCond);
+    ca_cond_free(g_threadWriteCharacteristicCond);
+    ca_cond_free(g_deviceScanRetryDelayCond);
+    ca_cond_free(g_threadScanIntervalCond);
+
+    g_deviceDescCond = NULL;
+    g_threadCond = NULL;
+    g_threadWriteCharacteristicCond = NULL;
+    g_deviceScanRetryDelayCond = NULL;
+    g_threadScanIntervalCond = NULL;
+
     if (isAttached)
     {
         (*g_jvm)->DetachCurrentThread(g_jvm);
@@ -3782,9 +4050,9 @@ void CATerminateLEGattClient()
     CALEClientTerminate();
 }
 
-CAResult_t  CAUpdateCharacteristicsToGattServer(const char *remoteAddress, const uint8_t  *data,
-                                                uint32_t dataLen, CALETransferType_t type,
-                                                int32_t position)
+CAResult_t CAUpdateCharacteristicsToGattServer(const char *remoteAddress, const uint8_t  *data,
+                                               uint32_t dataLen, CALETransferType_t type,
+                                               int32_t position)
 {
     OIC_LOG(DEBUG, TAG, "call CALEClientSendUnicastMessage");
     VERIFY_NON_NULL(data, TAG, "data is null");
@@ -3872,103 +4140,81 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeScanCallback(JNIEnv *env, jobject o
  */
 JNIEXPORT void JNICALL
 Java_org_iotivity_ca_CaLeClientInterface_caLeGattConnectionStateChangeCallback(JNIEnv *env,
-                                                                                jobject obj,
-                                                                                jobject gatt,
-                                                                                jint status,
-                                                                                jint newstate)
+                                                                               jobject obj,
+                                                                               jobject gatt,
+                                                                               jint status,
+                                                                               jint newstate)
 {
-    OIC_LOG_V(DEBUG, TAG, "CALeGattConnectionStateChangeCallback - status %d, newstate %d", status,
-            newstate);
+    OIC_LOG_V(INFO, TAG, "CALeGattConnectionStateChangeCallback - status %d, newstate %d", status,
+              newstate);
     VERIFY_NON_NULL_VOID(env, TAG, "env is null");
     VERIFY_NON_NULL_VOID(obj, TAG, "obj is null");
     VERIFY_NON_NULL_VOID(gatt, TAG, "gatt is null");
 
     jint state_connected = CALEGetConstantsValue(env, CLASSPATH_BT_PROFILE, "STATE_CONNECTED");
-    jint state_disconnected = CALEGetConstantsValue(env, CLASSPATH_BT_PROFILE, "STATE_DISCONNECTED");
-    jint gatt_success = CALEGetConstantsValue(env, CLASSPATH_BT_GATT, "GATT_SUCCESS");
 
-    if (gatt_success == status && state_connected == newstate) // le connected
+    jstring jni_address = CALEClientGetAddressFromGattObj(env, gatt);
+    if (!jni_address)
     {
-        jstring jni_address = CALEClientGetAddressFromGattObj(env, gatt);
-        if (!jni_address)
-        {
-            goto error_exit;
-        }
+        OIC_LOG(ERROR, TAG, "CALEClientGetAddressFromGattObj has failed");
+        goto error_exit;
+    }
 
-        const char* address = (*env)->GetStringUTFChars(env, jni_address, NULL);
-        if (address)
+    const char* address = (*env)->GetStringUTFChars(env, jni_address, NULL);
+    if (!address)
+    {
+        OIC_LOG(ERROR, TAG, "address is null");
+        goto error_exit;
+    }
+    OIC_LOG_V(DEBUG, TAG, "CALeGattConnectionStateChangeCallback - address [%s]", address);
+
+    if (state_connected == newstate)
+    {
+        OIC_LOG(DEBUG, TAG, "LE is connected");
+        if (GATT_SUCCESS == status)
         {
-            CAResult_t res = CALEClientUpdateDeviceState(address, STATE_CONNECTED,
-                                                         STATE_CHARACTER_NO_CHANGE,
-                                                         STATE_SEND_NONE);
+            CAResult_t res = CALEClientUpdateDeviceState(address,
+                                                         CA_LE_CONNECTION_STATE,
+                                                         STATE_CONNECTED);
+            (*env)->ReleaseStringUTFChars(env, jni_address, address);
             if (CA_STATUS_OK != res)
             {
                 OIC_LOG(ERROR, TAG, "CALEClientUpdateDeviceState has failed");
-                (*env)->ReleaseStringUTFChars(env, jni_address, address);
                 goto error_exit;
             }
-            OIC_LOG_V(INFO, TAG, "ConnectionStateCB - remote address : %s", address);
-
-            (*env)->ReleaseStringUTFChars(env, jni_address, address);
-        }
-
-        CAResult_t res = CALEClientAddGattobjToList(env, gatt);
-        if (CA_STATUS_OK != res)
-        {
-            OIC_LOG(ERROR, TAG, "CALEClientAddGattobjToList has failed");
-            goto error_exit;
-        }
 
-        res = CALEClientDiscoverServices(env, gatt);
-        if (CA_STATUS_OK != res)
-        {
-            OIC_LOG(ERROR, TAG, "CALEClientDiscoverServices has failed");
-            goto error_exit;
-        }
-    }
-    else if (GATT_ERROR == status && state_disconnected == newstate)
-    {
-        OIC_LOG(INFO, TAG, "Background connection running.. please wait");
-    }
-    else // le disconnected
-    {
-        CAResult_t res = CALEClientStartScan();
-        if (CA_STATUS_OK != res)
-        {
-            if (CA_ADAPTER_NOT_ENABLED == res)
+            res = CALEClientAddGattobjToList(env, gatt);
+            if (CA_STATUS_OK != res)
             {
-                // scan will be started with start server when adapter is enabled
-                OIC_LOG(INFO, TAG, "Adapter was disabled");
+                OIC_LOG(ERROR, TAG, "CALEClientAddGattobjToList has failed");
+                goto error_exit;
             }
-            else
+
+            res = CALEClientDiscoverServices(env, gatt);
+            if (CA_STATUS_OK != res)
             {
-                OIC_LOG(ERROR, TAG, "CALEClientStartScan has failed");
+                OIC_LOG(ERROR, TAG, "CALEClientDiscoverServices has failed");
                 goto error_exit;
             }
         }
-
-        jstring jni_address = CALEClientGetAddressFromGattObj(env, gatt);
-        if (!jni_address)
+        else
         {
-            OIC_LOG(ERROR, TAG, "CALEClientGetAddressFromGattObj has failed");
-            goto error_exit;
+            OIC_LOG(INFO, TAG, "unknown status");
+            (*env)->ReleaseStringUTFChars(env, jni_address, address);
         }
+    }
+    else // STATE_DISCONNECTED == newstate
+    {
+        OIC_LOG(DEBUG, TAG, "LE is disconnected");
 
-        const char* address = (*env)->GetStringUTFChars(env, jni_address, NULL);
-        if (address)
+        CAResult_t res = CALEClientUpdateDeviceState(address,
+                                                     CA_LE_CONNECTION_STATE,
+                                                     STATE_DISCONNECTED);
+        (*env)->ReleaseStringUTFChars(env, jni_address, address);
+        if (CA_STATUS_OK != res)
         {
-            CAResult_t res = CALEClientUpdateDeviceState(address, STATE_DISCONNECTED,
-                                                                  STATE_CHARACTER_UNSET,
-                                                                  STATE_SEND_NONE);
-            if (CA_STATUS_OK != res)
-            {
-                OIC_LOG(ERROR, TAG, "CALEClientUpdateDeviceState has failed");
-                (*env)->ReleaseStringUTFChars(env, jni_address, address);
-                goto error_exit;
-            }
-            OIC_LOG_V(INFO, TAG, "ConnectionStateCB - remote address : %s", address);
-
-            (*env)->ReleaseStringUTFChars(env, jni_address, address);
+            OIC_LOG(ERROR, TAG, "CALEClientUpdateDeviceState has failed");
+            goto error_exit;
         }
 
         res = CALEClientGattClose(env, gatt);
@@ -3977,6 +4223,22 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattConnectionStateChangeCallback(J
             OIC_LOG(ERROR, TAG, "CALEClientGattClose has failed");
         }
 
+        if (CALECheckConnectionStateValue(status))
+        {
+            // this state is unexpected reason to disconnect
+            // if the reason is suitable, connection logic of the device will be destroyed.
+            OIC_LOG(INFO, TAG, "connection logic destroy");
+            goto error_exit;
+        }
+        else
+        {
+            // other reason except for gatt_success is expected to running
+            // background connection in BT platform.
+            OIC_LOG(INFO, TAG, "unknown status or manual disconnected state");
+            CALEClientUpdateSendCnt(env);
+            return;
+        }
+
         if (g_sendBuffer)
         {
             (*env)->DeleteGlobalRef(env, g_sendBuffer);
@@ -3987,7 +4249,6 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattConnectionStateChangeCallback(J
 
     // error label.
 error_exit:
-
     CALEClientSendFinish(env, gatt);
     return;
 }
@@ -3999,16 +4260,16 @@ error_exit:
  */
 JNIEXPORT void JNICALL
 Java_org_iotivity_ca_CaLeClientInterface_caLeGattServicesDiscoveredCallback(JNIEnv *env,
-                                                                             jobject obj,
-                                                                             jobject gatt,
-                                                                             jint status)
+                                                                            jobject obj,
+                                                                            jobject gatt,
+                                                                            jint status)
 {
-    OIC_LOG_V(DEBUG, TAG, "CALeGattServicesDiscoveredCallback - status %d: ", status);
+    OIC_LOG_V(INFO, TAG, "CALeGattServicesDiscoveredCallback - status %d", status);
     VERIFY_NON_NULL_VOID(env, TAG, "env is null");
     VERIFY_NON_NULL_VOID(obj, TAG, "obj is null");
     VERIFY_NON_NULL_VOID(gatt, TAG, "gatt is null");
 
-    if (0 != status) // discovery error
+    if (GATT_SUCCESS != status) // discovery error
     {
         CALEClientSendFinish(env, gatt);
         return;
@@ -4028,62 +4289,68 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattServicesDiscoveredCallback(JNIE
         return;
     }
 
-    if (!CALEClientIsSetCharacteristic(address))
+    jstring jni_uuid = (*env)->NewStringUTF(env, OIC_GATT_CHARACTERISTIC_RESPONSE_UUID);
+    if (!jni_uuid)
     {
-        jstring jni_uuid = (*env)->NewStringUTF(env, OIC_GATT_CHARACTERISTIC_RESPONSE_UUID);
-        if (!jni_uuid)
-        {
-            OIC_LOG(ERROR, TAG, "jni_uuid is null");
-            goto error_exit;
-        }
+        OIC_LOG(ERROR, TAG, "jni_uuid is null");
+        goto error_exit;
+    }
+
+    jobject jni_obj_GattCharacteristic = CALEClientGetGattService(env, gatt, jni_uuid);
+    if (!jni_obj_GattCharacteristic)
+    {
+        OIC_LOG(ERROR, TAG, "jni_obj_GattCharacteristic is null");
+        goto error_exit;
+    }
+
+    CAResult_t res = CALEClientSetCharacteristicNotification(env, gatt,
+                                                             jni_obj_GattCharacteristic);
+    if (CA_STATUS_OK != res)
+    {
+        OIC_LOG(ERROR, TAG, "CALEClientSetCharacteristicNotification has failed");
+        goto error_exit;
+    }
+
+    res = CALEClientSetUUIDToDescriptor(env, gatt, jni_obj_GattCharacteristic);
+    if (CA_STATUS_OK != res)
+    {
+        OIC_LOG_V(INFO, TAG, "Descriptor is not found : %d", res);
 
-        jobject jni_obj_GattCharacteristic = CALEClientGetGattService(env, gatt, jni_uuid);
-        if (!jni_obj_GattCharacteristic)
+        res = CALEClientSetFlagToState(env, jni_address, CA_LE_DESCRIPTOR_FOUND, JNI_FALSE);
+        if (CA_STATUS_OK != res)
         {
-            OIC_LOG(ERROR, TAG, "jni_obj_GattCharacteristic is null");
+            OIC_LOG(ERROR, TAG, "CALEClientSetFlagToState has failed");
             goto error_exit;
         }
 
-        CAResult_t res = CALEClientSetCharacteristicNotification(env, gatt,
-                                                                 jni_obj_GattCharacteristic);
+        res = CALEClientUpdateDeviceState(address, CA_LE_CONNECTION_STATE,
+                                          STATE_SERVICE_CONNECTED);
         if (CA_STATUS_OK != res)
         {
-            OIC_LOG(ERROR, TAG, "CALEClientSetCharacteristicNotification has failed");
+            OIC_LOG(ERROR, TAG, "CALEClientUpdateDeviceState has failed");
             goto error_exit;
         }
 
-        res = CALEClientSetUUIDToDescriptor(env, gatt, jni_obj_GattCharacteristic);
-        if (CA_STATUS_OK != res)
+        if (g_sendBuffer)
         {
-            OIC_LOG_V(INFO, TAG, "Descriptor is not found : %d", res);
-            if (g_sendBuffer)
+            CAResult_t res = CALEClientWriteCharacteristic(env, gatt);
+            if (CA_STATUS_OK != res)
             {
-                CAResult_t res = CALEClientWriteCharacteristic(env, gatt);
-                if (CA_STATUS_OK != res)
-                {
-                    OIC_LOG(ERROR, TAG, "CALEClientWriteCharacteristic has failed");
-                    goto error_exit;
-                }
+                OIC_LOG(ERROR, TAG, "CALEClientWriteCharacteristic has failed");
+                goto error_exit;
             }
         }
-
-        res = CALEClientUpdateDeviceState(address, STATE_CONNECTED, STATE_CHARACTER_SET,
-                                          STATE_SEND_NONE);
-        if (CA_STATUS_OK != res)
-        {
-            OIC_LOG(ERROR, TAG, "CALEClientUpdateDeviceState has failed");
-            goto error_exit;
-        }
     }
     else
     {
-        CAResult_t res = CALEClientWriteCharacteristic(env, gatt);
+        res = CALEClientSetFlagToState(env, jni_address, CA_LE_DESCRIPTOR_FOUND, JNI_TRUE);
         if (CA_STATUS_OK != res)
         {
-            OIC_LOG(ERROR, TAG, "CALEClientWriteCharacteristic has failed");
+            OIC_LOG(ERROR, TAG, "CALEClientSetFlagToState has failed");
             goto error_exit;
         }
     }
+
     OIC_LOG(INFO, TAG, "ServicesDiscovery is successful");
     (*env)->ReleaseStringUTFChars(env, jni_address, address);
     return;
@@ -4103,19 +4370,13 @@ error_exit:
  */
 JNIEXPORT void JNICALL
 Java_org_iotivity_ca_CaLeClientInterface_caLeGattCharacteristicWriteCallback(
-        JNIEnv *env, jobject obj, jobject gatt, jbyteArray data,
-        jint status)
+        JNIEnv *env, jobject obj, jobject gatt, jbyteArray data, jint status)
 {
-    OIC_LOG_V(DEBUG, TAG, "CALeGattCharacteristicWriteCallback - status : %d", status);
+    OIC_LOG_V(INFO, TAG, "CALeGattCharacteristicWriteCallback - status : %d", status);
     VERIFY_NON_NULL_VOID(env, TAG, "env is null");
     VERIFY_NON_NULL_VOID(obj, TAG, "obj is null");
     VERIFY_NON_NULL_VOID(gatt, TAG, "gatt is null");
 
-    jboolean isCopy;
-    char* wroteData = (char*) (*env)->GetByteArrayElements(env, data, &isCopy);
-
-    OIC_LOG_V(DEBUG, TAG, "CALeGattCharacteristicWriteCallback - write data : %s", wroteData);
-
     // send success & signal
     jstring jni_address = CALEClientGetAddressFromGattObj(env, gatt);
     if (!jni_address)
@@ -4129,8 +4390,7 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattCharacteristicWriteCallback(
         goto error_exit;
     }
 
-    jint gatt_success = CALEGetConstantsValue(env, CLASSPATH_BT_GATT, "GATT_SUCCESS");
-    if (gatt_success != status) // error case
+    if (GATT_SUCCESS != status) // error case
     {
         OIC_LOG(ERROR, TAG, "send failure");
 
@@ -4144,9 +4404,8 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattCharacteristicWriteCallback(
             ca_cond_signal(g_threadWriteCharacteristicCond);
             ca_mutex_unlock(g_threadWriteCharacteristicMutex);
 
-            CAResult_t res = CALEClientUpdateDeviceState(address, STATE_CONNECTED,
-                                                         STATE_CHARACTER_SET,
-                                                         STATE_SEND_FAILED);
+            CAResult_t res = CALEClientUpdateDeviceState(address, CA_LE_SEND_STATE,
+                                                         STATE_SEND_FAIL);
             if (CA_STATUS_OK != res)
             {
                 OIC_LOG(ERROR, TAG, "CALEClientUpdateDeviceState has failed");
@@ -4158,14 +4417,14 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattCharacteristicWriteCallback(
                 g_clientErrorCallback(address, data, length, CA_SEND_FAILED);
             }
 
-            CALEClientSendFinish(env, gatt);
+            (*env)->ReleaseStringUTFChars(env, jni_address, address);
             goto error_exit;
         }
     }
     else
     {
         OIC_LOG(DEBUG, TAG, "send success");
-        CAResult_t res = CALEClientUpdateDeviceState(address, STATE_CONNECTED, STATE_CHARACTER_SET,
+        CAResult_t res = CALEClientUpdateDeviceState(address, CA_LE_SEND_STATE,
                                                      STATE_SEND_SUCCESS);
         if (CA_STATUS_OK != res)
         {
@@ -4177,8 +4436,6 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattCharacteristicWriteCallback(
         g_isSignalSetFlag = true;
         ca_cond_signal(g_threadWriteCharacteristicCond);
         ca_mutex_unlock(g_threadWriteCharacteristicMutex);
-
-        CALEClientUpdateSendCnt(env);
     }
 
     (*env)->ReleaseStringUTFChars(env, jni_address, address);
@@ -4200,7 +4457,7 @@ JNIEXPORT void JNICALL
 Java_org_iotivity_ca_CaLeClientInterface_caLeGattCharacteristicChangedCallback(
         JNIEnv *env, jobject obj, jobject gatt, jbyteArray data)
 {
-    OIC_LOG(DEBUG, TAG, "CALeGattCharacteristicChangedCallback");
+    OIC_LOG(INFO, TAG, "CALeGattCharacteristicChangedCallback");
     VERIFY_NON_NULL_VOID(env, TAG, "env is null");
     VERIFY_NON_NULL_VOID(obj, TAG, "obj is null");
     VERIFY_NON_NULL_VOID(gatt, TAG, "gatt is null");
@@ -4244,10 +4501,9 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattCharacteristicChangedCallback(
     OIC_LOG_V(DEBUG, TAG, "CALeGattCharacteristicChangedCallback - data. : %p, %d",
               receivedData, length);
 
-    ca_mutex_lock(g_bleServerBDAddressMutex);
     uint32_t sentLength = 0;
-    g_CABLEClientDataReceivedCallback(address, receivedData, length,
-                                      &sentLength);
+    ca_mutex_lock(g_bleServerBDAddressMutex);
+    g_CABLEClientDataReceivedCallback(address, receivedData, length, &sentLength);
     ca_mutex_unlock(g_bleServerBDAddressMutex);
 
     (*env)->ReleaseStringUTFChars(env, jni_address, address);
@@ -4263,14 +4519,34 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattDescriptorWriteCallback(JNIEnv
                                                                          jobject gatt,
                                                                          jint status)
 {
-    OIC_LOG_V(DEBUG, TAG, "CALeGattDescriptorWriteCallback - status %d: ", status);
+    OIC_LOG_V(INFO, TAG, "CALeGattDescriptorWriteCallback - status %d", status);
     VERIFY_NON_NULL_VOID(env, TAG, "env is null");
     VERIFY_NON_NULL_VOID(obj, TAG, "obj is null");
     VERIFY_NON_NULL_VOID(gatt, TAG, "gatt is null");
 
-    jint gatt_success = CALEGetConstantsValue(env, CLASSPATH_BT_GATT, "GATT_SUCCESS");
-    if (gatt_success != status) // error
+    if (GATT_SUCCESS != status) // error
+    {
+        goto error_exit;
+    }
+
+    jstring jni_address = CALEClientGetAddressFromGattObj(env, gatt);
+    if (!jni_address)
+    {
+        goto error_exit;
+    }
+
+    const char* address = (*env)->GetStringUTFChars(env, jni_address, NULL);
+    if (!address)
+    {
+        goto error_exit;
+    }
+
+    CAResult_t res = CALEClientUpdateDeviceState(address, CA_LE_CONNECTION_STATE,
+                                                 STATE_SERVICE_CONNECTED);
+    (*env)->ReleaseStringUTFChars(env, jni_address, address);
+    if (CA_STATUS_OK != res)
     {
+        OIC_LOG(ERROR, TAG, "CALEClientUpdateDeviceState has failed");
         goto error_exit;
     }