check if send request is sucessful or not.
[platform/upstream/iotivity.git] / resource / csdk / connectivity / src / bt_le_adapter / android / caleclient.c
index 38ae49a..8e7502f 100644 (file)
 #include "uarraylist.h"
 #include "org_iotivity_ca_CaLeClientInterface.h"
 
-#define TAG PCF("CA_LE_CLIENT")
+#define TAG PCF("OIC_CA_LE_CLIENT")
 
-static const char METHODID_OBJECTNONPARAM[] = "()Landroid/bluetooth/BluetoothAdapter;";
-static const char CLASSPATH_BT_ADAPTER[] = "android/bluetooth/BluetoothAdapter";
-static const char CLASSPATH_BT_UUID[] = "java/util/UUID";
-static const char CLASSPATH_BT_GATT[] = "android/bluetooth/BluetoothGatt";
+#define MICROSECS_PER_SEC 1000000
+#define WAIT_TIME_WRITE_CHARACTERISTIC 10 * MICROSECS_PER_SEC
+
+static ca_thread_pool_t g_threadPoolHandle = NULL;
 
 JavaVM *g_jvm;
 static u_arraylist_t *g_deviceList = NULL; // device list to have same UUID
@@ -51,7 +51,6 @@ static u_arraylist_t *g_deviceStateList = NULL;
 
 static CAPacketReceiveCallback g_packetReceiveCallback = NULL;
 static CABLEErrorHandleCallback g_clientErrorCallback;
-static ca_thread_pool_t g_threadPoolHandle = NULL;
 static jobject g_leScanCallback = NULL;
 static jobject g_leGattCallback = NULL;
 static jobject g_context = NULL;
@@ -69,8 +68,12 @@ static bool g_isFinishedSendData = false;
 static ca_mutex g_SendFinishMutex = NULL;
 static ca_mutex g_threadMutex = NULL;
 static ca_cond g_threadCond = NULL;
+static ca_cond g_deviceDescCond = NULL;
 
 static ca_mutex g_threadSendMutex = NULL;
+static ca_mutex g_threadWriteCharacteristicMutex = NULL;
+static ca_cond g_threadWriteCharacteristicCond = NULL;
+static bool g_isSignalSetFlag = false;
 
 static ca_mutex g_bleReqRespClientCbMutex = NULL;
 static ca_mutex g_bleServerBDAddressMutex = NULL;
@@ -79,8 +82,12 @@ 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 CABLEDataReceivedCallback g_CABLEClientDataReceivedCallback = NULL;
 
+static jboolean g_autoConnectFlag = JNI_FALSE;
+
 //getting jvm
 void CALEClientJniInit()
 {
@@ -161,7 +168,7 @@ error_exit:
     return CA_STATUS_FAILED;
 }
 
-CAResult_t CALEClientInitialize(ca_thread_pool_t handle)
+CAResult_t CALEClientInitialize()
 {
     OIC_LOG(DEBUG, TAG, "CALEClientInitialize");
 
@@ -202,8 +209,6 @@ CAResult_t CALEClientInitialize(ca_thread_pool_t handle)
         return ret;
     }
 
-    g_threadPoolHandle = handle;
-
     ret = CALEClientInitGattMutexVaraibles();
     if (CA_STATUS_OK != ret)
     {
@@ -218,8 +223,11 @@ CAResult_t CALEClientInitialize(ca_thread_pool_t handle)
         return ret;
     }
 
+    g_deviceDescCond = ca_cond_new();
+
     // init mutex for send logic
     g_threadCond = ca_cond_new();
+    g_threadWriteCharacteristicCond = ca_cond_new();
 
     CALEClientCreateDeviceList();
     CALEClientJNISetContext();
@@ -251,6 +259,11 @@ CAResult_t CALEClientInitialize(ca_thread_pool_t handle)
     }
     g_isStartedLEClient = true;
 
+    if (isAttached)
+    {
+        (*g_jvm)->DetachCurrentThread(g_jvm);
+    }
+
     return CA_STATUS_OK;
 }
 
@@ -319,12 +332,21 @@ void CALEClientTerminate()
     }
 
     g_isStartedMulticastServer = false;
-    g_isStartedScan = false;
+    CALEClientSetScanFlag(false);
     CALEClientSetSendFinishFlag(false);
 
     CALEClientTerminateGattMutexVariables();
+    CALEClientDestroyJniInterface();
 
+    ca_cond_free(g_deviceDescCond);
     ca_cond_free(g_threadCond);
+    ca_cond_free(g_threadWriteCharacteristicCond);
+
+    g_deviceDescCond = NULL;
+    g_threadCond = NULL;
+    g_threadWriteCharacteristicCond = NULL;
+    g_isSignalSetFlag = false;
+    CALEClientSetAutoConnectFlag(JNI_FALSE);
 
     if (isAttached)
     {
@@ -332,6 +354,77 @@ void CALEClientTerminate()
     }
 }
 
+CAResult_t CALEClientDestroyJniInterface()
+{
+    OIC_LOG(DEBUG, TAG, "CALEClientDestroyJniInterface");
+
+    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;
+    }
+
+    jclass jni_LeInterface = (*env)->FindClass(env, "org/iotivity/ca/CaLeClientInterface");
+    if (!jni_LeInterface)
+    {
+        OIC_LOG(ERROR, TAG, "Could not get CaLeClientInterface class");
+        goto error_exit;
+    }
+
+    jmethodID jni_InterfaceDestroyMethod = (*env)->GetStaticMethodID(env, jni_LeInterface,
+                                                                     "destroyLeInterface",
+                                                                     "()V");
+    if (!jni_InterfaceDestroyMethod)
+    {
+        OIC_LOG(ERROR, TAG, "Could not get CaLeClientInterface destroy method");
+        goto error_exit;
+    }
+
+    (*env)->CallStaticVoidMethod(env, jni_LeInterface, jni_InterfaceDestroyMethod);
+
+    if ((*env)->ExceptionCheck(env))
+    {
+        OIC_LOG(ERROR, TAG, "destroyLeInterface has failed");
+        (*env)->ExceptionDescribe(env);
+        (*env)->ExceptionClear(env);
+        goto error_exit;
+    }
+
+    OIC_LOG(DEBUG, TAG, "Destroy instance for CaLeClientInterface");
+
+    if (isAttached)
+    {
+        (*g_jvm)->DetachCurrentThread(g_jvm);
+    }
+
+    return CA_STATUS_OK;
+
+error_exit:
+
+    if (isAttached)
+    {
+        (*g_jvm)->DetachCurrentThread(g_jvm);
+    }
+
+    return CA_STATUS_FAILED;
+}
+
 void CALEClientSendFinish(JNIEnv *env, jobject gatt)
 {
     OIC_LOG(DEBUG, TAG, "CALEClientSendFinish");
@@ -482,6 +575,47 @@ void CASetBLEClientErrorHandleCallback(CABLEErrorHandleCallback callback)
     g_clientErrorCallback = callback;
 }
 
+CAResult_t CALEClientIsThereScannedDevices()
+{
+    if (!g_deviceList)
+    {
+        return CA_STATUS_FAILED;
+    }
+
+    if (0 == u_arraylist_length(g_deviceList))
+    {
+        // Wait for LE peripherals to be discovered.
+
+        // Number of times to wait for discovery to complete.
+        static size_t const RETRIES = 5;
+
+        static uint64_t const TIMEOUT =
+            2 * MICROSECS_PER_SEC;  // Microseconds
+
+        bool devicesDiscovered = false;
+        for (size_t i = 0;
+             0 == u_arraylist_length(g_deviceList) && i < RETRIES;
+             ++i)
+        {
+            if (ca_cond_wait_for(g_deviceDescCond,
+                                 g_threadSendMutex,
+                                 TIMEOUT) == CA_WAIT_SUCCESS)
+            {
+                devicesDiscovered = true;
+                break;
+            }
+        }
+
+        // time out for scanning devices
+        if (!devicesDiscovered)
+        {
+            return CA_STATUS_FAILED;
+        }
+    }
+
+    return CA_STATUS_OK;
+}
+
 CAResult_t CALEClientSendUnicastMessageImpl(const char* address, const uint8_t* data,
                                       const uint32_t dataLen)
 {
@@ -513,7 +647,15 @@ CAResult_t CALEClientSendUnicastMessageImpl(const char* address, const uint8_t*
 
     ca_mutex_lock(g_threadSendMutex);
 
-    CAResult_t ret = CA_STATUS_OK;
+    CALEClientSetSendFinishFlag(false);
+
+    CAResult_t ret = CALEClientIsThereScannedDevices();
+    if (CA_STATUS_OK != ret)
+    {
+        OIC_LOG(INFO, TAG, "there is no scanned device");
+        goto error_exit;
+    }
+
     if (g_context && g_deviceList)
     {
         uint32_t length = u_arraylist_length(g_deviceList);
@@ -557,11 +699,15 @@ CAResult_t CALEClientSendUnicastMessageImpl(const char* address, const uint8_t*
                 if (g_sendBuffer)
                 {
                     (*env)->DeleteGlobalRef(env, g_sendBuffer);
+                    g_sendBuffer = NULL;
                 }
                 jbyteArray jni_arr = (*env)->NewByteArray(env, dataLen);
                 (*env)->SetByteArrayRegion(env, jni_arr, 0, dataLen, (jbyte*) data);
                 g_sendBuffer = (jbyteArray)(*env)->NewGlobalRef(env, jni_arr);
 
+                // Target device to send message is just one.
+                g_targetCnt = 1;
+
                 ret = CALEClientSendData(env, jarrayObj);
                 if (CA_STATUS_OK != ret)
                 {
@@ -576,16 +722,22 @@ CAResult_t CALEClientSendUnicastMessageImpl(const char* address, const uint8_t*
         }
     }
 
-    if (isAttached)
+    OIC_LOG(DEBUG, TAG, "connection routine is finished for unicast");
+
+    // wait for finish to send data through "CALeGattServicesDiscoveredCallback"
+    // if there is no connection state.
+    ca_mutex_lock(g_threadMutex);
+    if (!g_isFinishedSendData)
     {
-        (*g_jvm)->DetachCurrentThread(g_jvm);
+        OIC_LOG(DEBUG, TAG, "waiting send finish signal");
+        ca_cond_wait(g_threadCond, g_threadMutex);
+        OIC_LOG(DEBUG, TAG, "the data was sent");
     }
+    ca_mutex_unlock(g_threadMutex);
 
-    ret = CALECheckSendState(address);
-    if(CA_STATUS_OK != ret)
+    if (isAttached)
     {
-        OIC_LOG(ERROR, TAG, "send has failed");
-        goto error_exit;
+        (*g_jvm)->DetachCurrentThread(g_jvm);
     }
 
     // start LE Scan again
@@ -598,8 +750,8 @@ CAResult_t CALEClientSendUnicastMessageImpl(const char* address, const uint8_t*
     }
 
     ca_mutex_unlock(g_threadSendMutex);
-    OIC_LOG(INFO, TAG, "unicast - send success");
-    return CA_STATUS_OK;
+    OIC_LOG(INFO, TAG, "unicast - send logic has finished");
+    return CALECheckSendState(address);
 
     // error label.
 error_exit:
@@ -610,6 +762,10 @@ error_exit:
     {
         OIC_LOG(ERROR, TAG, "CALEClientStartScan has failed");
         ca_mutex_unlock(g_threadSendMutex);
+        if (isAttached)
+        {
+            (*g_jvm)->DetachCurrentThread(g_jvm);
+        }
         return res;
     }
 
@@ -617,6 +773,11 @@ error_exit:
     {
         (*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;
 }
@@ -642,26 +803,30 @@ CAResult_t CALEClientSendMulticastMessageImpl(JNIEnv *env, const uint8_t* data,
     if (g_sendBuffer)
     {
         (*env)->DeleteGlobalRef(env, g_sendBuffer);
+        g_sendBuffer = NULL;
+    }
+
+    CAResult_t res = CALEClientIsThereScannedDevices();
+    if (CA_STATUS_OK != res)
+    {
+        OIC_LOG(INFO, TAG, "there is no scanned device");
+        goto error_exit;
     }
-    jbyteArray jni_arr = (*env)->NewByteArray(env, dataLen);
-    (*env)->SetByteArrayRegion(env, jni_arr, 0, dataLen, (jbyte*) data);
-    g_sendBuffer = (jbyteArray)(*env)->NewGlobalRef(env, jni_arr);
 
     // connect to gatt server
-    CAResult_t res = CALEClientStopScan();
+    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;
-    if (0 == length)
-    {
-        goto error_exit;
-    }
+
+    jbyteArray jni_arr = (*env)->NewByteArray(env, dataLen);
+    (*env)->SetByteArrayRegion(env, jni_arr, 0, dataLen, (jbyte*) data);
+    g_sendBuffer = (jbyteArray)(*env)->NewGlobalRef(env, jni_arr);
 
     for (uint32_t index = 0; index < length; index++)
     {
@@ -692,28 +857,20 @@ CAResult_t CALEClientSendMulticastMessageImpl(JNIEnv *env, const uint8_t* data,
             continue;
         }
 
-        res = CALECheckSendState(address);
-        if (CA_STATUS_OK != res)
-        {
-            OIC_LOG_V(INFO, TAG, "multicast : send has failed for this device[%s]", address);
-            g_clientErrorCallback(address, data, dataLen, res);
-            (*env)->ReleaseStringUTFChars(env, jni_address, address);
-            continue;
-        }
-
         (*env)->ReleaseStringUTFChars(env, jni_address, address);
     }
 
-    OIC_LOG(DEBUG, TAG, "connection routine is finished");
+    OIC_LOG(DEBUG, TAG, "connection routine is finished for multicast");
 
     // wait for finish to send data through "CALeGattServicesDiscoveredCallback"
+    ca_mutex_lock(g_threadMutex);
     if (!g_isFinishedSendData)
     {
-        ca_mutex_lock(g_threadMutex);
+        OIC_LOG(DEBUG, TAG, "waiting send finish signal");
         ca_cond_wait(g_threadCond, g_threadMutex);
-        OIC_LOG(DEBUG, TAG, "the data was sent for All devices");
-        ca_mutex_unlock(g_threadMutex);
+        OIC_LOG(DEBUG, TAG, "the data was sent");
     }
+    ca_mutex_unlock(g_threadMutex);
 
     // start LE Scan again
     res = CALEClientStartScan();
@@ -761,6 +918,8 @@ CAResult_t CALECheckSendState(const char* address)
         ca_mutex_unlock(g_deviceStateListMutex);
         return CA_SEND_FAILED;
     }
+
+    OIC_LOG(INFO, TAG, "sendstate is STATE_SEND_SUCCESS");
     ca_mutex_unlock(g_deviceStateListMutex);
     return CA_STATUS_OK;
 }
@@ -771,32 +930,58 @@ CAResult_t CALEClientSendData(JNIEnv *env, jobject device)
     VERIFY_NON_NULL(device, TAG, "device is null");
     VERIFY_NON_NULL(env, TAG, "env is null");
 
-    jstring jni_address = CALEGetAddressFromBTDevice(env, device);
-    if (!jni_address)
+    // get BLE address from bluetooth device object.
+    char* address = NULL;
+    CALEState_t* state = NULL;
+    jstring jni_address = CALEClientGetLEAddressFromBTDevice(env, device);
+    if (jni_address)
     {
-        OIC_LOG(ERROR, TAG, "CALEGetAddressFromBTDevice has failed");
-        return CA_STATUS_FAILED;
-    }
-
-    const char* address = (*env)->GetStringUTFChars(env, jni_address, NULL);
-    if (!address)
-    {
-        OIC_LOG(ERROR, TAG, "address is not available");
-        return CA_STATUS_FAILED;
+        OIC_LOG(INFO, TAG, "there is gatt object..it's not first connection");
+        address = (char*)(*env)->GetStringUTFChars(env, jni_address, NULL);
+        if (!address)
+        {
+            OIC_LOG(ERROR, TAG, "address is not available");
+            return CA_STATUS_FAILED;
+        }
+        ca_mutex_lock(g_deviceStateListMutex);
+        state = CALEClientGetStateInfo(address);
+        ca_mutex_unlock(g_deviceStateListMutex);
+        (*env)->ReleaseStringUTFChars(env, jni_address, address);
     }
 
-    ca_mutex_lock(g_deviceStateListMutex);
-    CALEState_t* state = CALEClientGetStateInfo(address);
-    ca_mutex_unlock(g_deviceStateListMutex);
     if (!state)
     {
         OIC_LOG(DEBUG, TAG, "state is empty..start to connect LE");
-        CAResult_t ret = CALEClientConnect(env, device, JNI_FALSE, g_leGattCallback);
-        if (CA_STATUS_OK != ret)
+
+        // cancel previous connection request before connection
+        // if there is gatt object in g_gattObjectList.
+        if (jni_address)
         {
-            OIC_LOG(ERROR, TAG, "CALEClientConnect has 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)
+            {
+                CAResult_t res = CALEClientDisconnect(env, gatt);
+                if (CA_STATUS_OK != res)
+                {
+                    OIC_LOG(INFO, TAG, "there is no gatt object");
+                }
+            }
             (*env)->ReleaseStringUTFChars(env, jni_address, address);
-            return ret;
+        }
+
+        // connection request
+        jobject newGatt = CALEClientConnect(env, device, CALEClientGetAutoConnectFlag());
+        if (NULL == newGatt)
+        {
+            OIC_LOG(ERROR, TAG, "CALEClientConnect has failed");
+            return CA_STATUS_FAILED;
         }
     }
     else
@@ -804,6 +989,19 @@ CAResult_t CALEClientSendData(JNIEnv *env, jobject device)
         if (STATE_CONNECTED == state->connectedState)
         {
             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)
             {
@@ -812,28 +1010,52 @@ CAResult_t CALEClientSendData(JNIEnv *env, jobject device)
                 return CA_STATUS_FAILED;
             }
 
-            CAResult_t ret = CALEClientWriteCharacteristic(env, gatt);
+            CAResult_t ret = CALESetValueAndWriteCharacteristic(env, gatt);
             if (CA_STATUS_OK != ret)
             {
-                OIC_LOG(ERROR, TAG, "CALEClientWriteCharacteristic has failed");
+                OIC_LOG(ERROR, TAG, "CALESetValueAndWriteCharacteristic has failed");
                 (*env)->ReleaseStringUTFChars(env, jni_address, address);
                 return ret;
             }
+            (*env)->ReleaseStringUTFChars(env, jni_address, address);
         }
         else
         {
+            OIC_LOG(INFO, TAG, "STATE_DISCONNECTED - start to connect LE");
+
+            // cancel previous connection request before connection
+            // 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)
+                {
+                    CAResult_t res = CALEClientDisconnect(env, gatt);
+                    if (CA_STATUS_OK != res)
+                    {
+                        OIC_LOG(INFO, TAG, "there is no gatt object");
+                    }
+                }
+                (*env)->ReleaseStringUTFChars(env, jni_address, address);
+            }
+
             OIC_LOG(DEBUG, TAG, "start to connect LE");
-            CAResult_t ret = CALEClientConnect(env, device, JNI_FALSE, g_leGattCallback);
-            if (CA_STATUS_OK != ret)
+            jobject gatt = CALEClientConnect(env, device, JNI_TRUE);
+            if (NULL == gatt)
             {
                 OIC_LOG(ERROR, TAG, "CALEClientConnect has failed");
-                (*env)->ReleaseStringUTFChars(env, jni_address, address);
-                return ret;
+                return CA_STATUS_FAILED;
             }
         }
     }
 
-    (*env)->ReleaseStringUTFChars(env, jni_address, address);
     return CA_STATUS_OK;
 }
 
@@ -965,17 +1187,20 @@ CAResult_t CALEClientStartScan()
     {
 #ifdef UUID_SCAN
         ret = CALEClientStartScanWithUUIDImpl(env, g_uuidList, g_leScanCallback);
-        if(CA_STATUS_OK != ret)
-        {
-            OIC_LOG(ERROR, TAG, "CALEClientStartScanWithUUIDImpl has failed");
-        }
 #else
         ret = CALEClientStartScanImpl(env, g_leScanCallback);
+#endif
         if (CA_STATUS_OK != ret)
         {
-            OIC_LOG(ERROR, TAG, "CALEClientStartScanImpl has failed");
+            if (CA_ADAPTER_NOT_ENABLED == ret)
+            {
+                OIC_LOG(DEBUG, TAG, "Adapter is disabled");
+            }
+            else
+            {
+                OIC_LOG(ERROR, TAG, "start scan has failed");
+            }
         }
-#endif
     }
 
     if (isAttached)
@@ -993,7 +1218,7 @@ CAResult_t CALEClientStartScanImpl(JNIEnv *env, jobject callback)
 
     if (!CALEIsEnableBTAdapter(env))
     {
-        OIC_LOG(ERROR, TAG, "BT adapter is not enabled");
+        OIC_LOG(INFO, TAG, "BT adapter is not enabled");
         return CA_ADAPTER_NOT_ENABLED;
     }
 
@@ -1045,7 +1270,7 @@ CAResult_t CALEClientStartScanImpl(JNIEnv *env, jobject callback)
     else
     {
         OIC_LOG(DEBUG, TAG, "startLeScan is started");
-        g_isStartedScan = true;
+        CALEClientSetScanFlag(true);
     }
 
     return CA_STATUS_OK;
@@ -1059,7 +1284,7 @@ CAResult_t CALEClientStartScanWithUUIDImpl(JNIEnv *env, jobjectArray uuids, jobj
 
     if (!CALEIsEnableBTAdapter(env))
     {
-        OIC_LOG(ERROR, TAG, "BT adapter is not enabled");
+        OIC_LOG(INFO, TAG, "BT adapter is not enabled");
         return CA_ADAPTER_NOT_ENABLED;
     }
 
@@ -1110,7 +1335,7 @@ CAResult_t CALEClientStartScanWithUUIDImpl(JNIEnv *env, jobjectArray uuids, jobj
     else
     {
         OIC_LOG(DEBUG, TAG, "startLeScan With UUID is started");
-        g_isStartedScan = true;
+        CALEClientSetScanFlag(true);
     }
 
     return CA_STATUS_OK;
@@ -1182,11 +1407,18 @@ CAResult_t CALEClientStopScan()
     CAResult_t ret = CALEClientStopScanImpl(env, g_leScanCallback);
     if (CA_STATUS_OK != ret)
     {
-        OIC_LOG(ERROR, TAG, "CALEClientStopScanImpl has failed");
+        if (CA_ADAPTER_NOT_ENABLED == ret)
+        {
+            OIC_LOG(DEBUG, TAG, "Adapter is disabled");
+        }
+        else
+        {
+            OIC_LOG(ERROR, TAG, "CALEClientStopScanImpl has failed");
+        }
     }
     else
     {
-        g_isStartedScan = false;
+        CALEClientSetScanFlag(false);
     }
 
     if (isAttached)
@@ -1197,6 +1429,13 @@ 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");
@@ -1205,7 +1444,7 @@ CAResult_t CALEClientStopScanImpl(JNIEnv *env, jobject callback)
 
     if (!CALEIsEnableBTAdapter(env))
     {
-        OIC_LOG(ERROR, TAG, "BT adapter is not enabled");
+        OIC_LOG(INFO, TAG, "BT adapter is not enabled");
         return CA_ADAPTER_NOT_ENABLED;
     }
 
@@ -1260,25 +1499,94 @@ CAResult_t CALEClientStopScanImpl(JNIEnv *env, jobject callback)
     return CA_STATUS_OK;
 }
 
-CAResult_t CALEClientConnect(JNIEnv *env, jobject bluetoothDevice, jboolean autoconnect,
-                             jobject callback)
+void CALEClientSetAutoConnectFlag(jboolean flag)
+{
+    OIC_LOG_V(INFO, TAG, "auto connect flag is set %d", flag);
+    g_autoConnectFlag = flag;
+}
+
+jboolean CALEClientGetAutoConnectFlag()
+{
+    OIC_LOG_V(INFO, TAG, "auto connect flag is %d", g_autoConnectFlag);
+    return g_autoConnectFlag;
+}
+
+jobject CALEClientConnect(JNIEnv *env, jobject bluetoothDevice, jboolean autoconnect)
+{
+    OIC_LOG(DEBUG, TAG, "CALEClientConnect");
+    VERIFY_NON_NULL_RET(env, TAG, "env is null", NULL);
+    VERIFY_NON_NULL_RET(bluetoothDevice, TAG, "bluetoothDevice is null", NULL);
+
+    // get gatt object from Bluetooth Device object for closeProfileProxy(..)
+    jstring jni_address = CALEClientGetLEAddressFromBTDevice(env, bluetoothDevice);
+    if (jni_address)
+    {
+        const char* address = (*env)->GetStringUTFChars(env, jni_address, NULL);
+        if (!address)
+        {
+            OIC_LOG(ERROR, TAG, "address is not available");
+            return NULL;
+        }
+
+        // close the gatt service
+        jobject gatt = CALEClientGetGattObjInList(env, address);
+        if (gatt)
+        {
+            CAResult_t res = CALEClientCloseProfileProxy(env, gatt);
+            if (CA_STATUS_OK != res)
+            {
+                OIC_LOG(ERROR, TAG, "CALEClientCloseProfileProxy has failed");
+                (*env)->ReleaseStringUTFChars(env, jni_address, address);
+                return NULL;
+            }
+
+            // clean previous gatt object after close profile service
+            res = CALEClientRemoveGattObjForAddr(env, jni_address);
+            if (CA_STATUS_OK != res)
+            {
+                OIC_LOG(ERROR, TAG, "CALEClientRemoveGattObjForAddr has failed");
+                (*env)->ReleaseStringUTFChars(env, jni_address, address);
+                return NULL;
+            }
+        }
+        (*env)->ReleaseStringUTFChars(env, jni_address, address);
+    }
+
+    jobject newGatt = CALEClientGattConnect(env, bluetoothDevice, autoconnect);
+    if (!newGatt)
+    {
+        OIC_LOG(DEBUG, TAG, "re-connection will be started");
+        return NULL;
+    }
+
+    // add new gatt object into g_gattObjectList
+    CAResult_t res = CALEClientAddGattobjToList(env, newGatt);
+    if (CA_STATUS_OK != res)
+    {
+        OIC_LOG(ERROR, TAG, "CALEClientAddGattobjToList has failed");
+        return NULL;
+    }
+
+    return newGatt;
+}
+
+jobject CALEClientGattConnect(JNIEnv *env, jobject bluetoothDevice, jboolean autoconnect)
 {
     OIC_LOG(DEBUG, TAG, "GATT CONNECT");
-    VERIFY_NON_NULL(env, TAG, "env is null");
-    VERIFY_NON_NULL(bluetoothDevice, TAG, "bluetoothDevice is null");
-    VERIFY_NON_NULL(callback, TAG, "callback is null");
+    VERIFY_NON_NULL_RET(env, TAG, "env is null", NULL);
+    VERIFY_NON_NULL_RET(bluetoothDevice, TAG, "bluetoothDevice is null", NULL);
 
     if (!CALEIsEnableBTAdapter(env))
     {
-        OIC_LOG(ERROR, TAG, "BT adapter is not enabled");
-        return CA_ADAPTER_NOT_ENABLED;
+        OIC_LOG(INFO, TAG, "BT adapter is not enabled");
+        return NULL;
     }
 
     jstring jni_address = CALEGetAddressFromBTDevice(env, bluetoothDevice);
     if (!jni_address)
     {
         OIC_LOG(ERROR, TAG, "bleConnect: CALEGetAddressFromBTDevice is null");
-        return CA_STATUS_FAILED;
+        return NULL;
     }
 
     // get BluetoothDevice class
@@ -1287,7 +1595,7 @@ CAResult_t CALEClientConnect(JNIEnv *env, jobject bluetoothDevice, jboolean auto
     if (!jni_cid_BluetoothDevice)
     {
         OIC_LOG(ERROR, TAG, "bleConnect: jni_cid_BluetoothDevice is null");
-        return CA_STATUS_FAILED;
+        return NULL;
     }
 
     // get connectGatt method
@@ -1299,40 +1607,111 @@ CAResult_t CALEClientConnect(JNIEnv *env, jobject bluetoothDevice, jboolean auto
     if (!jni_mid_connectGatt)
     {
         OIC_LOG(ERROR, TAG, "bleConnect: jni_mid_connectGatt is null");
-        return CA_STATUS_FAILED;
+        return NULL;
     }
 
-    OIC_LOG(DEBUG, TAG, "Call object method - connectGatt");
+    OIC_LOG(INFO, TAG, "CALL API - connectGatt");
     jobject jni_obj_connectGatt = (*env)->CallObjectMethod(env, bluetoothDevice,
                                                            jni_mid_connectGatt,
                                                            NULL,
-                                                           autoconnect, callback);
+                                                           autoconnect, g_leGattCallback);
     if (!jni_obj_connectGatt)
     {
-        OIC_LOG(ERROR, TAG, "CALL API - connectGatt was failed..it will be removed");
+        OIC_LOG(ERROR, TAG, "connectGatt was failed..it will be removed");
         CALEClientRemoveDeviceInScanDeviceList(env, jni_address);
         CALEClientUpdateSendCnt(env);
-        return CA_STATUS_FAILED;
+        return NULL;
     }
     else
     {
         OIC_LOG(DEBUG, TAG, "le connecting..please wait..");
     }
+    return jni_obj_connectGatt;
+}
+
+CAResult_t CALEClientCloseProfileProxy(JNIEnv *env, jobject gatt)
+{
+    OIC_LOG(DEBUG, TAG, "IN - CALEClientCloseProfileProxy");
+
+    VERIFY_NON_NULL(env, TAG, "env is null");
+    VERIFY_NON_NULL(gatt, TAG, "gatt is null");
+
+    jclass jni_cid_BTAdapter = (*env)->FindClass(env, CLASSPATH_BT_ADAPTER);
+    if (!jni_cid_BTAdapter)
+    {
+        OIC_LOG(ERROR, TAG, "jni_cid_BTAdapter is null");
+        return CA_STATUS_FAILED;
+    }
+
+    // get remote bt adapter method
+    jmethodID jni_mid_getDefaultAdapter = (*env)->GetStaticMethodID(env, jni_cid_BTAdapter,
+                                                                    "getDefaultAdapter",
+                                                                    METHODID_OBJECTNONPARAM);
+    if (!jni_mid_getDefaultAdapter)
+    {
+        OIC_LOG(ERROR, TAG, "jni_mid_getDefaultAdapter is null");
+        return CA_STATUS_FAILED;
+    }
+
+    // gat bt adapter object
+    jobject jni_obj_BTAdapter = (*env)->CallStaticObjectMethod(env, jni_cid_BTAdapter,
+                                                               jni_mid_getDefaultAdapter);
+    if (!jni_obj_BTAdapter)
+    {
+        OIC_LOG(ERROR, TAG, "jni_obj_BTAdapter is null");
+        return CA_STATUS_FAILED;
+    }
+
+    // get closeProfileProxy method
+    jmethodID jni_mid_closeProfileProxy = (*env)->GetMethodID(env, jni_cid_BTAdapter,
+                                                              "closeProfileProxy",
+                                                              "(ILandroid/bluetooth/"
+                                                              "BluetoothProfile;)V");
+    if (!jni_mid_closeProfileProxy)
+    {
+        OIC_LOG(ERROR, TAG, "jni_mid_closeProfileProxy is null");
+        return CA_STATUS_FAILED;
+    }
+
+    jclass jni_cid_BTProfile = (*env)->FindClass(env, CLASSPATH_BT_PROFILE);
+    if (!jni_cid_BTProfile)
+    {
+        OIC_LOG(ERROR, TAG, "jni_cid_BTProfile is null");
+        return CA_STATUS_FAILED;
+    }
+
+    // GATT - Constant value : 7 (0x00000007)
+    jfieldID id_gatt = (*env)->GetStaticFieldID(env, jni_cid_BTProfile,
+                                                "GATT", "I");
+    if (!id_gatt)
+    {
+        OIC_LOG(ERROR, TAG, "id_gatt is null");
+        return CA_STATUS_FAILED;
+    }
+
+    jint jni_gatt = (*env)->GetStaticIntField(env, jni_cid_BTProfile, id_gatt);
+
+    OIC_LOG(DEBUG, TAG, "CALL API - close the connection of the profile proxy to the Service");
+    (*env)->CallVoidMethod(env, jni_obj_BTAdapter, jni_mid_closeProfileProxy, jni_gatt, gatt);
+    if ((*env)->ExceptionCheck(env))
+    {
+        OIC_LOG(ERROR, TAG, "closeProfileProxy has failed");
+        (*env)->ExceptionDescribe(env);
+        (*env)->ExceptionClear(env);
+        return CA_STATUS_FAILED;
+    }
+
+    OIC_LOG(DEBUG, TAG, "OUT - CALEClientCloseProfileProxy");
     return CA_STATUS_OK;
 }
 
+
 CAResult_t CALEClientDisconnect(JNIEnv *env, jobject bluetoothGatt)
 {
     OIC_LOG(DEBUG, TAG, "GATT DISCONNECT");
     VERIFY_NON_NULL(env, TAG, "env is null");
     VERIFY_NON_NULL(bluetoothGatt, TAG, "bluetoothGatt is null");
 
-    if (!CALEIsEnableBTAdapter(env))
-    {
-        OIC_LOG(ERROR, TAG, "BT adapter is not enabled");
-        return CA_ADAPTER_NOT_ENABLED;
-    }
-
     // get BluetoothGatt class
     jclass jni_cid_BluetoothGatt = (*env)->FindClass(env, CLASSPATH_BT_GATT);
     if (!jni_cid_BluetoothGatt)
@@ -1351,6 +1730,7 @@ CAResult_t CALEClientDisconnect(JNIEnv *env, jobject bluetoothGatt)
     }
 
     // call disconnect gatt method
+    OIC_LOG(DEBUG, TAG, "CALL API - request disconnect gatt");
     (*env)->CallVoidMethod(env, bluetoothGatt, jni_mid_disconnectGatt);
     if ((*env)->ExceptionCheck(env))
     {
@@ -1372,13 +1752,15 @@ CAResult_t CALEClientDisconnectAll(JNIEnv *env)
 
     if (!g_gattObjectList)
     {
-        OIC_LOG(ERROR, TAG, "g_gattObjectList is null");
-        return CA_STATUS_FAILED;
+        OIC_LOG(DEBUG, TAG, "already removed for g_gattObjectList");
+        return CA_STATUS_OK;
     }
 
     uint32_t length = u_arraylist_length(g_gattObjectList);
+    OIC_LOG_V(DEBUG, TAG, "list length : %d", length);
     for (uint32_t index = 0; index < length; index++)
     {
+        OIC_LOG(DEBUG, TAG, "start CALEClientDisconnectAll");
         jobject jarrayObj = (jobject) u_arraylist_get(g_gattObjectList, index);
         if (!jarrayObj)
         {
@@ -1393,9 +1775,73 @@ CAResult_t CALEClientDisconnectAll(JNIEnv *env)
         }
     }
 
-    OICFree(g_gattObjectList);
-    g_gattObjectList = NULL;
+    return CA_STATUS_OK;
+}
+
+CAResult_t CALEClientDisconnectforAddress(JNIEnv *env, jstring remote_address)
+{
+    OIC_LOG(DEBUG, TAG, "IN-CALEClientDisconnectforAddress");
+    VERIFY_NON_NULL(env, TAG, "env is null");
+
+    if (!g_gattObjectList)
+    {
+        OIC_LOG(DEBUG, TAG, "already removed for g_gattObjectList");
+        return CA_STATUS_OK;
+    }
+
+    char* address = (char*)(*env)->GetStringUTFChars(env, remote_address, NULL);
+    if (!address)
+    {
+        OIC_LOG(ERROR, TAG, "address is null");
+        return CA_STATUS_FAILED;
+    }
+
+    uint32_t length = u_arraylist_length(g_gattObjectList);
+    for (uint32_t index = 0; index < length; index++)
+    {
+        jobject jarrayObj = (jobject) u_arraylist_get(g_gattObjectList, index);
+        if (!jarrayObj)
+        {
+            OIC_LOG(ERROR, TAG, "jarrayObj is null");
+            continue;
+        }
+
+        jstring jni_setAddress = CALEClientGetAddressFromGattObj(env, jarrayObj);
+        if (!jni_setAddress)
+        {
+            OIC_LOG(ERROR, TAG, "jni_setAddress is null");
+            (*env)->ReleaseStringUTFChars(env, remote_address, address);
+            return CA_STATUS_FAILED;
+        }
+
+        const char* setAddress = (*env)->GetStringUTFChars(env, jni_setAddress, NULL);
+        if (!setAddress)
+        {
+            OIC_LOG(ERROR, TAG, "setAddress is null");
+            (*env)->ReleaseStringUTFChars(env, remote_address, address);
+            return CA_STATUS_FAILED;
+        }
 
+        OIC_LOG_V(DEBUG, TAG, "target address : %s, set address : %s", address, setAddress);
+        if (!strcmp(address, setAddress))
+        {
+            CAResult_t res = CALEClientDisconnect(env, jarrayObj);
+            if (CA_STATUS_OK != res)
+            {
+                OIC_LOG(ERROR, TAG, "CALEClientDisconnect has failed");
+                (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
+                (*env)->ReleaseStringUTFChars(env, remote_address, address);
+                return CA_STATUS_FAILED;
+            }
+            (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
+            (*env)->ReleaseStringUTFChars(env, remote_address, address);
+            return CA_STATUS_OK;
+        }
+        (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
+    }
+    (*env)->ReleaseStringUTFChars(env, remote_address, address);
+
+    OIC_LOG(DEBUG, TAG, "OUT-CALEClientDisconnectforAddress");
     return CA_STATUS_OK;
 }
 
@@ -1406,7 +1852,7 @@ CAResult_t CALEClientDiscoverServices(JNIEnv *env, jobject bluetoothGatt)
 
     if (!CALEIsEnableBTAdapter(env))
     {
-        OIC_LOG(ERROR, TAG, "BT adapter is not enabled");
+        OIC_LOG(INFO, TAG, "BT adapter is not enabled");
         return CA_ADAPTER_NOT_ENABLED;
     }
 
@@ -1419,30 +1865,63 @@ CAResult_t CALEClientDiscoverServices(JNIEnv *env, jobject bluetoothGatt)
         return CA_STATUS_FAILED;
     }
 
-    OIC_LOG(DEBUG, TAG, "discovery gatt services method");
-    jmethodID jni_mid_discoverServices = (*env)->GetMethodID(env, jni_cid_BluetoothGatt,
-                                                             "discoverServices", "()Z");
-    if (!jni_mid_discoverServices)
+    OIC_LOG(DEBUG, TAG, "discovery gatt services method");
+    jmethodID jni_mid_discoverServices = (*env)->GetMethodID(env, jni_cid_BluetoothGatt,
+                                                             "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");
+    jboolean ret = (*env)->CallBooleanMethod(env, bluetoothGatt, jni_mid_discoverServices);
+    if (!ret)
+    {
+        OIC_LOG(ERROR, TAG, "discoverServices has not been started");
+        return CA_STATUS_FAILED;
+    }
+
+    return CA_STATUS_OK;
+}
+
+static void CALEWriteCharacteristicThread(void* object)
+{
+    VERIFY_NON_NULL_VOID(object, TAG, "object is null");
+
+    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;
+        }
+        isAttached = true;
+    }
+
+    jobject gatt = (jobject)object;
+    CAResult_t ret = CALESetValueAndWriteCharacteristic(env, gatt);
+    if (CA_STATUS_OK != ret)
     {
-        OIC_LOG(ERROR, TAG, "jni_mid_discoverServices is null");
-        return CA_STATUS_FAILED;
+        OIC_LOG(ERROR, TAG, "CALESetValueAndWriteCharacteristic has failed");
     }
-    // call disconnect gatt method
-    OIC_LOG(DEBUG, TAG, "CALL API - request discovery gatt services");
-    jboolean ret = (*env)->CallBooleanMethod(env, bluetoothGatt, jni_mid_discoverServices);
-    if (!ret)
+
+    if (isAttached)
     {
-        OIC_LOG(ERROR, TAG, "discoverServices has not been started");
-        return CA_STATUS_FAILED;
+        (*g_jvm)->DetachCurrentThread(g_jvm);
     }
-
-    return CA_STATUS_OK;
 }
 
-CAResult_t CALEClientWriteCharacteristic(JNIEnv *env, jobject gatt)
+CAResult_t CALESetValueAndWriteCharacteristic(JNIEnv* env, jobject gatt)
 {
-    VERIFY_NON_NULL(env, TAG, "env is null");
     VERIFY_NON_NULL(gatt, TAG, "gatt is null");
+    VERIFY_NON_NULL(env, TAG, "env is null");
 
     // send data
     jobject jni_obj_character = CALEClientCreateGattCharacteristic(env, gatt, g_sendBuffer);
@@ -1456,14 +1935,53 @@ CAResult_t CALEClientWriteCharacteristic(JNIEnv *env, jobject gatt)
     if (CA_STATUS_OK != ret)
     {
         CALEClientSendFinish(env, gatt);
-        return ret;
+        return CA_STATUS_FAILED;
+    }
+
+    // wait for callback for write Characteristic with success to sent data
+    OIC_LOG_V(DEBUG, TAG, "callback flag is %d", g_isSignalSetFlag);
+    ca_mutex_lock(g_threadWriteCharacteristicMutex);
+    if (!g_isSignalSetFlag)
+    {
+        OIC_LOG(DEBUG, TAG, "wait for callback to notify writeCharacteristic is success");
+        if (CA_WAIT_SUCCESS != ca_cond_wait_for(g_threadWriteCharacteristicCond,
+                                  g_threadWriteCharacteristicMutex,
+                                  WAIT_TIME_WRITE_CHARACTERISTIC))
+        {
+            OIC_LOG(ERROR, TAG, "there is no response. write has failed");
+            g_isSignalSetFlag = false;
+            ca_mutex_unlock(g_threadWriteCharacteristicMutex);
+            return CA_STATUS_FAILED;
+        }
+    }
+    // reset flag set by writeCharacteristic Callback
+    g_isSignalSetFlag = false;
+    ca_mutex_unlock(g_threadWriteCharacteristicMutex);
+
+    OIC_LOG(INFO, TAG, "writeCharacteristic success!!");
+    return CA_STATUS_OK;
+}
+
+CAResult_t CALEClientWriteCharacteristic(JNIEnv *env, jobject gatt)
+{
+    OIC_LOG(DEBUG, TAG, "IN - CALEClientWriteCharacteristic");
+    VERIFY_NON_NULL(env, TAG, "env is null");
+    VERIFY_NON_NULL(gatt, TAG, "gatt is null");
+
+    jobject gattParam = (*env)->NewGlobalRef(env, gatt);
+    if (CA_STATUS_OK != ca_thread_pool_add_task(g_threadPoolHandle,
+                                                CALEWriteCharacteristicThread, (void*)gattParam))
+    {
+        OIC_LOG(ERROR, TAG, "Failed to create read thread!");
+        return CA_STATUS_FAILED;
     }
 
+    OIC_LOG(DEBUG, TAG, "OUT - CALEClientWriteCharacteristic");
     return CA_STATUS_OK;
 }
 
 CAResult_t CALEClientWriteCharacteristicImpl(JNIEnv *env, jobject bluetoothGatt,
-                                           jobject gattCharacteristic)
+                                             jobject gattCharacteristic)
 {
     OIC_LOG(DEBUG, TAG, "WRITE GATT CHARACTERISTIC");
     VERIFY_NON_NULL(env, TAG, "env is null");
@@ -1472,7 +1990,7 @@ CAResult_t CALEClientWriteCharacteristicImpl(JNIEnv *env, jobject bluetoothGatt,
 
     if (!CALEIsEnableBTAdapter(env))
     {
-        OIC_LOG(ERROR, TAG, "BT adapter is not enabled");
+        OIC_LOG(INFO, TAG, "BT adapter is not enabled");
         return CA_STATUS_FAILED;
     }
 
@@ -1503,7 +2021,7 @@ CAResult_t CALEClientWriteCharacteristicImpl(JNIEnv *env, jobject bluetoothGatt,
                                                        gattCharacteristic);
     if (ret)
     {
-        OIC_LOG(DEBUG, TAG, "writeCharacteristic success");
+        OIC_LOG(DEBUG, TAG, "writeCharacteristic is called successfully");
     }
     else
     {
@@ -1521,7 +2039,7 @@ CAResult_t CALEClientReadCharacteristic(JNIEnv *env, jobject bluetoothGatt)
 
     if (!CALEIsEnableBTAdapter(env))
     {
-        OIC_LOG(ERROR, TAG, "BT adapter is not enabled");
+        OIC_LOG(INFO, TAG, "BT adapter is not enabled");
         return CA_STATUS_FAILED;
     }
 
@@ -1583,7 +2101,7 @@ CAResult_t CALEClientSetCharacteristicNotification(JNIEnv *env, jobject bluetoot
 
     if (!CALEIsEnableBTAdapter(env))
     {
-        OIC_LOG(ERROR, TAG, "BT adapter is not enabled");
+        OIC_LOG(INFO, TAG, "BT adapter is not enabled");
         return CA_ADAPTER_NOT_ENABLED;
     }
 
@@ -1630,7 +2148,7 @@ jobject CALEClientGetGattService(JNIEnv *env, jobject bluetoothGatt, jstring cha
 
     if (!CALEIsEnableBTAdapter(env))
     {
-        OIC_LOG(ERROR, TAG, "BT adapter is not enabled");
+        OIC_LOG(INFO, TAG, "BT adapter is not enabled");
         return NULL;
     }
 
@@ -1723,7 +2241,7 @@ jobject CALEClientCreateGattCharacteristic(JNIEnv *env, jobject bluetoothGatt, j
 
     if (!CALEIsEnableBTAdapter(env))
     {
-        OIC_LOG(ERROR, TAG, "BT adapter is not enabled");
+        OIC_LOG(INFO, TAG, "BT adapter is not enabled");
         return NULL;
     }
 
@@ -1802,7 +2320,7 @@ jbyteArray CALEClientGetValueFromCharacteristic(JNIEnv *env, jobject characteris
 
     if (!CALEIsEnableBTAdapter(env))
     {
-        OIC_LOG(ERROR, TAG, "BT adapter is not enabled");
+        OIC_LOG(INFO, TAG, "BT adapter is not enabled");
         return NULL;
     }
 
@@ -1905,7 +2423,7 @@ CAResult_t CALEClientSetUUIDToDescriptor(JNIEnv *env, jobject bluetoothGatt,
 
     if (!CALEIsEnableBTAdapter(env))
     {
-        OIC_LOG(ERROR, TAG, "BT adapter is not enabled");
+        OIC_LOG(INFO, TAG, "BT adapter is not enabled");
         return CA_ADAPTER_NOT_ENABLED;
     }
 
@@ -1941,8 +2459,8 @@ CAResult_t CALEClientSetUUIDToDescriptor(JNIEnv *env, jobject bluetoothGatt,
                                                           jni_mid_getDescriptor, jni_obj_cc_uuid);
     if (!jni_obj_descriptor)
     {
-        OIC_LOG(ERROR, TAG, "jni_obj_descriptor is null");
-        return CA_STATUS_FAILED;
+        OIC_LOG(INFO, TAG, "jni_obj_descriptor is null");
+        return CA_NOT_SUPPORTED;
     }
 
     OIC_LOG(DEBUG, TAG, "set value in descriptor");
@@ -2035,7 +2553,6 @@ void CALEClientCreateScanDeviceList(JNIEnv *env)
 
 CAResult_t CALEClientAddScanDeviceToList(JNIEnv *env, jobject device)
 {
-    OIC_LOG(DEBUG, TAG, "IN - CALEClientAddScanDeviceToList");
     VERIFY_NON_NULL(device, TAG, "device is null");
     VERIFY_NON_NULL(env, TAG, "env is null");
 
@@ -2068,19 +2585,18 @@ CAResult_t CALEClientAddScanDeviceToList(JNIEnv *env, jobject device)
     {
         jobject gdevice = (*env)->NewGlobalRef(env, device);
         u_arraylist_add(g_deviceList, gdevice);
-        OIC_LOG(DEBUG, TAG, "Set Object to Array as Element");
+        ca_cond_signal(g_deviceDescCond);
+        OIC_LOG_V(DEBUG, TAG, "Added this BT Device[%s] in the List", remoteAddress);
     }
     (*env)->ReleaseStringUTFChars(env, jni_remoteAddress, remoteAddress);
 
     ca_mutex_unlock(g_deviceListMutex);
 
-    OIC_LOG(DEBUG, TAG, "OUT - CALEClientAddScanDeviceToList");
     return CA_STATUS_OK;
 }
 
 bool CALEClientIsDeviceInScanDeviceList(JNIEnv *env, const char* remoteAddress)
 {
-    OIC_LOG(DEBUG, TAG, "IN - CALEClientIsDeviceInScanDeviceList");
     VERIFY_NON_NULL_RET(env, TAG, "env is null", NULL);
     VERIFY_NON_NULL_RET(remoteAddress, TAG, "remoteAddress is null", true);
 
@@ -2116,7 +2632,6 @@ bool CALEClientIsDeviceInScanDeviceList(JNIEnv *env, const char* remoteAddress)
 
         if (!strcmp(remoteAddress, setAddress))
         {
-            OIC_LOG(DEBUG, TAG, "the device is already set");
             (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
             return true;
         }
@@ -2124,7 +2639,6 @@ bool CALEClientIsDeviceInScanDeviceList(JNIEnv *env, const char* remoteAddress)
         (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
     }
 
-    OIC_LOG(DEBUG, TAG, "OUT - CALEClientIsDeviceInScanDeviceList");
     OIC_LOG(DEBUG, TAG, "there are no the device in list. we can add");
 
     return false;
@@ -2221,7 +2735,12 @@ CAResult_t CALEClientRemoveDeviceInScanDeviceList(JNIEnv *env, jstring address)
             (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
             (*env)->ReleaseStringUTFChars(env, address, remoteAddress);
 
-            CALEClientReorderingList(index, g_deviceList);
+            if (NULL == u_arraylist_remove(g_deviceList, index))
+            {
+                OIC_LOG(ERROR, TAG, "List removal failed.");
+                ca_mutex_unlock(g_deviceListMutex);
+                return CA_STATUS_FAILED;
+            }
             ca_mutex_unlock(g_deviceListMutex);
             return CA_STATUS_OK;
         }
@@ -2241,12 +2760,19 @@ CAResult_t CALEClientRemoveDeviceInScanDeviceList(JNIEnv *env, jstring address)
 
 CAResult_t CALEClientAddGattobjToList(JNIEnv *env, jobject gatt)
 {
-    OIC_LOG(DEBUG, TAG, "CALEClientAddGattobjToList");
+    OIC_LOG(INFO, TAG, "CALEClientAddGattobjToList");
     VERIFY_NON_NULL(env, TAG, "env is null");
     VERIFY_NON_NULL(gatt, TAG, "gatt is null");
 
     ca_mutex_lock(g_gattObjectMutex);
 
+    if (!g_gattObjectList)
+    {
+        OIC_LOG(ERROR, TAG, "g_gattObjectList is not available");
+        ca_mutex_unlock(g_gattObjectMutex);
+        return CA_STATUS_FAILED;
+    }
+
     jstring jni_remoteAddress = CALEClientGetAddressFromGattObj(env, gatt);
     if (!jni_remoteAddress)
     {
@@ -2263,11 +2789,12 @@ CAResult_t CALEClientAddGattobjToList(JNIEnv *env, jobject gatt)
         return CA_STATUS_FAILED;
     }
 
+    OIC_LOG_V(INFO, TAG, "remote address : %s", remoteAddress);
     if (!CALEClientIsGattObjInList(env, remoteAddress))
     {
         jobject newGatt = (*env)->NewGlobalRef(env, gatt);
         u_arraylist_add(g_gattObjectList, newGatt);
-        OIC_LOG(DEBUG, TAG, "Set GATT Object to Array as Element");
+        OIC_LOG(INFO, TAG, "Set GATT Object to Array as Element");
     }
 
     (*env)->ReleaseStringUTFChars(env, jni_remoteAddress, remoteAddress);
@@ -2380,9 +2907,9 @@ CAResult_t CALEClientRemoveAllGattObjs(JNIEnv *env)
     ca_mutex_lock(g_gattObjectMutex);
     if (!g_gattObjectList)
     {
-        OIC_LOG(ERROR, TAG, "g_gattObjectList is null");
+        OIC_LOG(DEBUG, TAG, "already removed for g_gattObjectList");
         ca_mutex_unlock(g_gattObjectMutex);
-        return CA_STATUS_FAILED;
+        return CA_STATUS_OK;
     }
 
     uint32_t length = u_arraylist_length(g_gattObjectList);
@@ -2399,6 +2926,7 @@ CAResult_t CALEClientRemoveAllGattObjs(JNIEnv *env)
 
     OICFree(g_gattObjectList);
     g_gattObjectList = NULL;
+    OIC_LOG(INFO, TAG, "g_gattObjectList is removed");
     ca_mutex_unlock(g_gattObjectMutex);
     return CA_STATUS_OK;
 }
@@ -2412,9 +2940,9 @@ CAResult_t CALEClientRemoveGattObj(JNIEnv *env, jobject gatt)
     ca_mutex_lock(g_gattObjectMutex);
     if (!g_gattObjectList)
     {
-        OIC_LOG(ERROR, TAG, "g_gattObjectList is null");
+        OIC_LOG(DEBUG, TAG, "already removed for g_gattObjectList");
         ca_mutex_unlock(g_gattObjectMutex);
-        return CA_STATUS_FAILED;
+        return CA_STATUS_OK;
     }
 
     uint32_t length = u_arraylist_length(g_gattObjectList);
@@ -2468,8 +2996,15 @@ CAResult_t CALEClientRemoveGattObj(JNIEnv *env, jobject gatt)
             (*env)->DeleteGlobalRef(env, jarrayObj);
             (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
             (*env)->ReleaseStringUTFChars(env, jni_remoteAddress, remoteAddress);
+
+            if (NULL == u_arraylist_remove(g_gattObjectList, index))
+            {
+                OIC_LOG(ERROR, TAG, "List removal failed.");
+                ca_mutex_unlock(g_gattObjectMutex);
+                return CA_STATUS_FAILED;
+            }
             ca_mutex_unlock(g_gattObjectMutex);
-            return CALEClientReorderingList(index, g_gattObjectList);
+            return CA_STATUS_OK;
         }
         (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
         (*env)->ReleaseStringUTFChars(env, jni_remoteAddress, remoteAddress);
@@ -2489,9 +3024,9 @@ CAResult_t CALEClientRemoveGattObjForAddr(JNIEnv *env, jstring addr)
     ca_mutex_lock(g_gattObjectMutex);
     if (!g_gattObjectList)
     {
-        OIC_LOG(ERROR, TAG, "g_gattObjectList is null");
+        OIC_LOG(DEBUG, TAG, "already removed for g_gattObjectList");
         ca_mutex_unlock(g_gattObjectMutex);
-        return CA_STATUS_FAILED;
+        return CA_STATUS_OK;
     }
 
     uint32_t length = u_arraylist_length(g_gattObjectList);
@@ -2537,8 +3072,14 @@ CAResult_t CALEClientRemoveGattObjForAddr(JNIEnv *env, jstring addr)
 
             (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
             (*env)->ReleaseStringUTFChars(env, addr, remoteAddress);
+            if (NULL == u_arraylist_remove(g_gattObjectList, index))
+            {
+                OIC_LOG(ERROR, TAG, "List removal failed.");
+                ca_mutex_unlock(g_gattObjectMutex);
+                return CA_STATUS_FAILED;
+            }
             ca_mutex_unlock(g_gattObjectMutex);
-            return CALEClientReorderingList(index, g_gattObjectList);
+            return CA_STATUS_OK;
         }
         (*env)->ReleaseStringUTFChars(env, jni_setAddress, setAddress);
         (*env)->ReleaseStringUTFChars(env, addr, remoteAddress);
@@ -2549,6 +3090,109 @@ CAResult_t CALEClientRemoveGattObjForAddr(JNIEnv *env, jstring addr)
     return CA_STATUS_FAILED;
 }
 
+jstring CALEClientGetLEAddressFromBTDevice(JNIEnv *env, jobject bluetoothDevice)
+{
+    OIC_LOG(DEBUG, TAG, "IN - CALEClientGetLEAddressFromBTDevice");
+
+    VERIFY_NON_NULL_RET(env, TAG, "env", NULL);
+    VERIFY_NON_NULL_RET(bluetoothDevice, TAG, "bluetoothDevice", NULL);
+
+    // get Bluetooth Address
+    jstring jni_btTargetAddress = CALEGetAddressFromBTDevice(env, bluetoothDevice);
+    if (!jni_btTargetAddress)
+    {
+        OIC_LOG(ERROR, TAG, "CALEGetAddressFromBTDevice has failed");
+        return NULL;
+    }
+
+    const char* targetAddress = (*env)->GetStringUTFChars(env, jni_btTargetAddress, NULL);
+    if (!targetAddress)
+    {
+        OIC_LOG(ERROR, TAG, "targetAddress is not available");
+        return NULL;
+    }
+
+    // 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);
+    if (!jni_mid_getDevice)
+    {
+        OIC_LOG(ERROR, TAG, "jni_mid_getDevice is null");
+        (*env)->ReleaseStringUTFChars(env, jni_btTargetAddress, targetAddress);
+        return NULL;
+    }
+
+    size_t length = u_arraylist_length(g_gattObjectList);
+    for (size_t index = 0; index < length; index++)
+    {
+        jobject jarrayObj = (jobject) u_arraylist_get(g_gattObjectList, index);
+        if (!jarrayObj)
+        {
+            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)
+        {
+            OIC_LOG(ERROR, TAG, "jni_obj_device is null");
+            (*env)->ReleaseStringUTFChars(env, jni_btTargetAddress, targetAddress);
+            return NULL;
+        }
+
+        jstring jni_btAddress = CALEGetAddressFromBTDevice(env, jni_obj_device);
+        if (!jni_btAddress)
+        {
+            OIC_LOG(ERROR, TAG, "CALEGetAddressFromBTDevice has failed");
+            (*env)->ReleaseStringUTFChars(env, jni_btTargetAddress, targetAddress);
+            return NULL;
+        }
+
+        const char* btAddress = (*env)->GetStringUTFChars(env, jni_btAddress, NULL);
+        if (!btAddress)
+        {
+            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);
+        if (!strcmp(targetAddress, btAddress))
+        {
+            OIC_LOG(DEBUG, TAG, "Found Gatt object from BT device");
+
+            // get LE address
+            jstring jni_LEAddress = CALEClientGetAddressFromGattObj(env, jarrayObj);
+            if (!jni_LEAddress)
+            {
+                OIC_LOG(ERROR, TAG, "jni_LEAddress is null");
+            }
+            (*env)->ReleaseStringUTFChars(env, jni_btTargetAddress, targetAddress);
+            (*env)->ReleaseStringUTFChars(env, jni_btAddress, btAddress);
+            (*env)->DeleteLocalRef(env, jni_btAddress);
+            (*env)->DeleteLocalRef(env, jni_obj_device);
+            return jni_LEAddress;
+        }
+        (*env)->ReleaseStringUTFChars(env, jni_btAddress, btAddress);
+        (*env)->DeleteLocalRef(env, jni_btAddress);
+        (*env)->DeleteLocalRef(env, jni_obj_device);
+    }
+
+    OIC_LOG(DEBUG, TAG, "OUT - CALEClientGetLEAddressFromBTDevice");
+    return NULL;
+}
+
 /**
  * BT State List
  */
@@ -2617,8 +3261,8 @@ CAResult_t CALEClientAddDeviceStateToList(CALEState_t* state)
         }
     }
     u_arraylist_add(g_deviceStateList, state); // update new state
-    OIC_LOG_V(DEBUG, TAG, "Set State Info to List : %d, %d",
-              state->connectedState, state->notificationState);
+    OIC_LOG_V(INFO, TAG, "Set State Info to List : %d, %d, %s",
+              state->connectedState, state->notificationState, state->address);
 
     ca_mutex_unlock(g_deviceStateListMutex);
     return CA_STATUS_OK;
@@ -2661,7 +3305,7 @@ bool CALEClientIsDeviceInList(const char* remoteAddress)
 
 CAResult_t CALEClientRemoveAllDeviceState()
 {
-    OIC_LOG(DEBUG, TAG, "CALENativeRemoveAllDevices");
+    OIC_LOG(DEBUG, TAG, "CALEClientRemoveAllDeviceState");
 
     ca_mutex_lock(g_deviceStateListMutex);
     if (!g_deviceStateList)
@@ -2713,20 +3357,22 @@ CAResult_t CALEClientRemoveDeviceState(const char* remoteAddress)
 
         if (!strcmp(state->address, remoteAddress))
         {
-            OIC_LOG_V(DEBUG, TAG, "remove state : %s", remoteAddress);
-            OICFree(state);
+            OIC_LOG_V(DEBUG, TAG, "remove state : %s", state->address);
 
-            CAResult_t res = CALEClientReorderingList(index, g_deviceStateList);
-            if(CA_STATUS_OK != res)
+            CALEState_t* targetState  = (CALEState_t*)u_arraylist_remove(g_deviceStateList,
+                                                                         index);
+            if (NULL == targetState)
             {
-                OIC_LOG(ERROR, TAG, "CALEClientReorderingList has failed");
-                return res;
+                OIC_LOG(ERROR, TAG, "List removal failed.");
+                return CA_STATUS_FAILED;
             }
+
+            OICFree(targetState);
             return CA_STATUS_OK;
         }
     }
 
-    return CA_STATUS_FAILED;
+    return CA_STATUS_OK;
 }
 
 CALEState_t* CALEClientGetStateInfo(const char* remoteAddress)
@@ -2741,6 +3387,8 @@ CALEState_t* CALEClientGetStateInfo(const char* remoteAddress)
     }
 
     uint32_t length = u_arraylist_length(g_deviceStateList);
+    OIC_LOG_V(DEBUG, TAG, "CALEClientGetStateInfo : %d", length);
+
     for (uint32_t index = 0; index < length; index++)
     {
         CALEState_t* state = (CALEState_t*) u_arraylist_get(g_deviceStateList, index);
@@ -2750,6 +3398,9 @@ 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);
+
         if (!strcmp(state->address, remoteAddress))
         {
             OIC_LOG_V(DEBUG, TAG, "get state : %s", remoteAddress);
@@ -2873,37 +3524,13 @@ void CALEClientCreateDeviceList()
     }
 }
 
-CAResult_t CALEClientReorderingList(uint32_t index, u_arraylist_t *list)
-{
-    if (!list)
-    {
-        OIC_LOG(ERROR, TAG, "list is null");
-        return CA_STATUS_FAILED;
-    }
-
-    if (index >= list->length)
-    {
-        OIC_LOG(ERROR, TAG, "index is not available");
-        return CA_STATUS_FAILED;
-    }
-
-    if (index < list->length - 1)
-    {
-        memmove(&list->data[index], &list->data[index + 1],
-                (list->length - index - 1) * sizeof(void *));
-    }
-
-    list->size--;
-    list->length--;
-
-    return CA_STATUS_OK;
-}
-
 /**
  * Check Sent Count for remove g_sendBuffer
  */
 void CALEClientUpdateSendCnt(JNIEnv *env)
 {
+    OIC_LOG(DEBUG, TAG, "CALEClientUpdateSendCnt");
+
     VERIFY_NON_NULL_VOID(env, TAG, "env is null");
     // mutex lock
     ca_mutex_lock(g_threadMutex);
@@ -2922,6 +3549,7 @@ void CALEClientUpdateSendCnt(JNIEnv *env)
         }
         // notity the thread
         ca_cond_signal(g_threadCond);
+
         CALEClientSetSendFinishFlag(true);
         OIC_LOG(DEBUG, TAG, "set signal for send data");
     }
@@ -2931,8 +3559,6 @@ void CALEClientUpdateSendCnt(JNIEnv *env)
 
 CAResult_t CALEClientInitGattMutexVaraibles()
 {
-    OIC_LOG(DEBUG, TAG, "IN");
-
     if (NULL == g_bleReqRespClientCbMutex)
     {
         g_bleReqRespClientCbMutex = ca_mutex_new();
@@ -3013,14 +3639,31 @@ CAResult_t CALEClientInitGattMutexVaraibles()
         }
     }
 
-    OIC_LOG(DEBUG, TAG, "OUT");
+    if (NULL == g_scanMutex)
+    {
+        g_scanMutex = ca_mutex_new();
+        if (NULL == g_scanMutex)
+        {
+            OIC_LOG(ERROR, TAG, "ca_mutex_new has failed");
+            return CA_STATUS_FAILED;
+        }
+    }
+
+    if (NULL == g_threadWriteCharacteristicMutex)
+    {
+        g_threadWriteCharacteristicMutex = ca_mutex_new();
+        if (NULL == g_threadWriteCharacteristicMutex)
+        {
+            OIC_LOG(ERROR, TAG, "ca_mutex_new has failed");
+            return CA_STATUS_FAILED;
+        }
+    }
+
     return CA_STATUS_OK;
 }
 
 void CALEClientTerminateGattMutexVariables()
 {
-    OIC_LOG(DEBUG, TAG, "IN");
-
     ca_mutex_free(g_bleReqRespClientCbMutex);
     g_bleReqRespClientCbMutex = NULL;
 
@@ -3039,7 +3682,11 @@ void CALEClientTerminateGattMutexVariables()
     ca_mutex_free(g_SendFinishMutex);
     g_SendFinishMutex = NULL;
 
-    OIC_LOG(DEBUG, TAG, "OUT");
+    ca_mutex_free(g_scanMutex);
+    g_scanMutex = NULL;
+
+    ca_mutex_free(g_threadWriteCharacteristicMutex);
+    g_threadWriteCharacteristicMutex = NULL;
 }
 
 void CALEClientSetSendFinishFlag(bool flag)
@@ -3108,7 +3755,13 @@ void CAStopLEGattClient()
         OIC_LOG(ERROR, TAG, "CALEClientStopScan has failed");
     }
 
+    ca_mutex_lock(g_threadMutex);
     ca_cond_signal(g_threadCond);
+    ca_mutex_unlock(g_threadMutex);
+
+    ca_mutex_lock(g_threadWriteCharacteristicMutex);
+    ca_cond_signal(g_threadWriteCharacteristicCond);
+    ca_mutex_unlock(g_threadWriteCharacteristicMutex);
 
     if (isAttached)
     {
@@ -3117,9 +3770,17 @@ void CAStopLEGattClient()
 
 }
 
+CAResult_t CAInitializeLEGattClient()
+{
+    OIC_LOG(DEBUG, TAG, "Initialize GATT Client");
+    CALEClientInitialize();
+    return CA_STATUS_OK;
+}
+
 void CATerminateLEGattClient()
 {
     OIC_LOG(DEBUG, TAG, "Terminate GATT Client");
+    CAStopLEGattClient();
     CALEClientTerminate();
 }
 
@@ -3150,22 +3811,14 @@ CAResult_t CAUpdateCharacteristicsToAllGattServers(const uint8_t *data, uint32_t
 
 void CASetLEReqRespClientCallback(CABLEDataReceivedCallback callback)
 {
-    OIC_LOG(DEBUG, TAG, "IN");
-
     ca_mutex_lock(g_bleReqRespClientCbMutex);
     g_CABLEClientDataReceivedCallback = callback;
     ca_mutex_unlock(g_bleReqRespClientCbMutex);
-
-    OIC_LOG(DEBUG, TAG, "OUT");
 }
 
 void CASetLEClientThreadPoolHandle(ca_thread_pool_t handle)
 {
-    OIC_LOG(DEBUG, TAG, "IN");
-
-    CALEClientInitialize(handle);
-
-    OIC_LOG(DEBUG, TAG, "OUT");
+    g_threadPoolHandle = handle;
 }
 
 CAResult_t CAGetLEAddress(char **local_address)
@@ -3232,7 +3885,11 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattConnectionStateChangeCallback(J
     VERIFY_NON_NULL_VOID(obj, TAG, "obj is null");
     VERIFY_NON_NULL_VOID(gatt, TAG, "gatt is null");
 
-    if (GATT_SUCCESS == status && STATE_CONNECTED == newstate) // le connected
+    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)
@@ -3252,6 +3909,8 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattConnectionStateChangeCallback(J
                 (*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);
         }
 
@@ -3269,30 +3928,48 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattConnectionStateChangeCallback(J
             goto error_exit;
         }
     }
-    else if (GATT_SUCCESS == status && STATE_DISCONNECTED == newstate) // le disconnected
+    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)
         {
-            OIC_LOG(ERROR, TAG, "CALEClientStartScan has failed");
+            if (CA_ADAPTER_NOT_ENABLED == res)
+            {
+                // scan will be started with start server when adapter is enabled
+                OIC_LOG(INFO, TAG, "Adapter was disabled");
+            }
+            else
+            {
+                OIC_LOG(ERROR, TAG, "CALEClientStartScan has failed");
+                goto error_exit;
+            }
         }
 
         jstring jni_address = CALEClientGetAddressFromGattObj(env, gatt);
         if (!jni_address)
         {
             OIC_LOG(ERROR, TAG, "CALEClientGetAddressFromGattObj has failed");
+            goto error_exit;
         }
 
         const char* address = (*env)->GetStringUTFChars(env, jni_address, NULL);
         if (address)
         {
-            res = CALEClientUpdateDeviceState(address, STATE_DISCONNECTED,
-                                              STATE_CHARACTER_NO_CHANGE,
-                                              STATE_SEND_NONE);
+            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);
         }
 
@@ -3301,38 +3978,12 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattConnectionStateChangeCallback(J
         {
             OIC_LOG(ERROR, TAG, "CALEClientGattClose has failed");
         }
-    }
-    else // error
-    {
-        // update state
-        jstring jni_address = CALEClientGetAddressFromGattObj(env, gatt);
-        if (!jni_address)
-        {
-            OIC_LOG(ERROR, TAG, "jni_address is null");
-            goto error_exit;
-
-        }
-
-        const char* address = (*env)->GetStringUTFChars(env, jni_address, NULL);
-        if (address)
-        {
-            CAResult_t res = CALEClientUpdateDeviceState(address, STATE_DISCONNECTED,
-                                                         STATE_CHARACTER_NO_CHANGE,
-                                                         STATE_SEND_FAILED);
-            if (CA_STATUS_OK != res)
-            {
-                OIC_LOG(ERROR, TAG, "CALEClientUpdateDeviceState has failed");
-            }
-        }
-        (*env)->ReleaseStringUTFChars(env, jni_address, address);
 
-        CAResult_t res = CALEClientGattClose(env, gatt);
-        if (CA_STATUS_OK != res)
+        if (g_sendBuffer)
         {
-            OIC_LOG(ERROR, TAG, "CALEClientGattClose has failed");
+            (*env)->DeleteGlobalRef(env, g_sendBuffer);
+            g_sendBuffer = NULL;
         }
-
-        goto error_exit;
     }
     return;
 
@@ -3406,12 +4057,15 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattServicesDiscoveredCallback(JNIE
         res = CALEClientSetUUIDToDescriptor(env, gatt, jni_obj_GattCharacteristic);
         if (CA_STATUS_OK != res)
         {
-            OIC_LOG(INFO, TAG, "Descriptor of the uuid is not found");
-            CAResult_t res = CALEClientWriteCharacteristic(env, gatt);
-            if (CA_STATUS_OK != res)
+            OIC_LOG_V(INFO, TAG, "Descriptor is not found : %d", res);
+            if (g_sendBuffer)
             {
-                OIC_LOG(ERROR, TAG, "CALEClientWriteCharacteristic has failed");
-                goto error_exit;
+                CAResult_t res = CALEClientWriteCharacteristic(env, gatt);
+                if (CA_STATUS_OK != res)
+                {
+                    OIC_LOG(ERROR, TAG, "CALEClientWriteCharacteristic has failed");
+                    goto error_exit;
+                }
             }
         }
 
@@ -3432,11 +4086,13 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattServicesDiscoveredCallback(JNIE
             goto error_exit;
         }
     }
+    OIC_LOG(INFO, TAG, "ServicesDiscovery is successful");
     (*env)->ReleaseStringUTFChars(env, jni_address, address);
     return;
 
     // error label.
 error_exit:
+    OIC_LOG(ERROR, TAG, "ServicesDiscovery has failed");
     (*env)->ReleaseStringUTFChars(env, jni_address, address);
     CALEClientSendFinish(env, gatt);
     return;
@@ -3475,16 +4131,38 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattCharacteristicWriteCallback(
         goto error_exit;
     }
 
-    if (GATT_SUCCESS != status) // error case
+    jint gatt_success = CALEGetConstantsValue(env, CLASSPATH_BT_GATT, "GATT_SUCCESS");
+    if (gatt_success != status) // error case
     {
         OIC_LOG(ERROR, TAG, "send failure");
-        CAResult_t res = CALEClientUpdateDeviceState(address, STATE_CONNECTED, STATE_CHARACTER_SET,
-                                                     STATE_SEND_FAILED);
+
+        // retry to write
+        CAResult_t res = CALEClientWriteCharacteristic(env, gatt);
         if (CA_STATUS_OK != res)
         {
-            OIC_LOG(ERROR, TAG, "CALEClientUpdateDeviceState has failed");
+            OIC_LOG(ERROR, TAG, "WriteCharacteristic has failed");
+            ca_mutex_lock(g_threadWriteCharacteristicMutex);
+            g_isSignalSetFlag = true;
+            ca_cond_signal(g_threadWriteCharacteristicCond);
+            ca_mutex_unlock(g_threadWriteCharacteristicMutex);
+
+            CAResult_t res = CALEClientUpdateDeviceState(address, STATE_CONNECTED,
+                                                         STATE_CHARACTER_SET,
+                                                         STATE_SEND_FAILED);
+            if (CA_STATUS_OK != res)
+            {
+                OIC_LOG(ERROR, TAG, "CALEClientUpdateDeviceState has failed");
+            }
+
+            if (g_clientErrorCallback)
+            {
+                jint length = (*env)->GetArrayLength(env, data);
+                g_clientErrorCallback(address, data, length, CA_SEND_FAILED);
+            }
+
+            CALEClientSendFinish(env, gatt);
+            goto error_exit;
         }
-        CALEClientSendFinish(env, gatt);
     }
     else
     {
@@ -3495,6 +4173,13 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattCharacteristicWriteCallback(
         {
             OIC_LOG(ERROR, TAG, "CALEClientUpdateDeviceState has failed");
         }
+
+        ca_mutex_lock(g_threadWriteCharacteristicMutex);
+        OIC_LOG(DEBUG, TAG, "g_isSignalSetFlag is set true and signal");
+        g_isSignalSetFlag = true;
+        ca_cond_signal(g_threadWriteCharacteristicCond);
+        ca_mutex_unlock(g_threadWriteCharacteristicMutex);
+
         CALEClientUpdateSendCnt(env);
     }
 
@@ -3585,12 +4270,21 @@ Java_org_iotivity_ca_CaLeClientInterface_caLeGattDescriptorWriteCallback(JNIEnv
     VERIFY_NON_NULL_VOID(obj, TAG, "obj is null");
     VERIFY_NON_NULL_VOID(gatt, TAG, "gatt is null");
 
-    CAResult_t res = CALEClientWriteCharacteristic(env, gatt);
-    if (CA_STATUS_OK != res)
+    jint gatt_success = CALEGetConstantsValue(env, CLASSPATH_BT_GATT, "GATT_SUCCESS");
+    if (gatt_success != status) // error
     {
-        OIC_LOG(ERROR, TAG, "CALEClientWriteCharacteristic has failed");
         goto error_exit;
     }
+
+    if (g_sendBuffer)
+    {
+        CAResult_t res = CALEClientWriteCharacteristic(env, gatt);
+        if (CA_STATUS_OK != res)
+        {
+            OIC_LOG(ERROR, TAG, "CALEClientWriteCharacteristic has failed");
+            goto error_exit;
+        }
+    }
     return;
 
 // error label.