diff --git a/MQTTSNGateway/GatewayTester/samples/mainTest.cpp b/MQTTSNGateway/GatewayTester/samples/mainTest.cpp
index 38e82dd..cbd7cd8 100644
--- a/MQTTSNGateway/GatewayTester/samples/mainTest.cpp
+++ b/MQTTSNGateway/GatewayTester/samples/mainTest.cpp
@@ -44,26 +44,26 @@ extern int run(void);
  *
  */
 /*------------------------------------------------------
- *    UDP Configuration
+ *    UDP Configuration    (theNetcon)
  *------------------------------------------------------*/
 UDPCONF  = {
-	"GatewayTester",     // ClientId
+	"GatewayTestClient", // ClientId
 	{225,1,1,1},         // Multicast group IP
 	1883,                // Multicast group Port
 	20001,               // Local PortNo
 };
 
 /*------------------------------------------------------
- *    Client Configuration
+ *    Client Configuration  (theMqcon)
  *------------------------------------------------------*/
 MQTTSNCONF = {
-	300,            //KeepAlive (seconds)
-	true,           //Clean session
-	0,              //Sleep duration in msecs
-	"willTopic",    //WillTopic
-	"willMessage",  //WillMessage
-    0,              //WillQos
-    false           //WillRetain
+	60,            //KeepAlive [seconds]
+	true,          //Clean session
+	300,           //Sleep duration [seconds]
+	"",            //WillTopic
+	"",            //WillMessage
+    0,             //WillQos
+    false          //WillRetain
 };
 
 /*------------------------------------------------------
@@ -162,6 +162,11 @@ void disconnect(void)
 	DISCONNECT(0);
 }
 
+void asleep(void)
+{
+	DISCONNECT(theMqcon.sleepDuration);
+}
+
 /*------------------------------------------------------
  *    A List of Test functions
  *------------------------------------------------------*/
@@ -175,7 +180,9 @@ TEST_LIST = {// e.g. TEST( Label, Test),
 			 TEST("Step6:Publish topic2",     publishTopic2),
 			 TEST("Step7:subscribe again",    subscribechangeCallback),
 			 TEST("Step8:Publish topic2",     publishTopic2),
-			 TEST("Step9:Disconnect",         disconnect),
+			 TEST("Step9:Sleep     ",         asleep),
+			 TEST("Step10:Publish topic1",    publishTopic1),
+			 TEST("Step11:Disconnect",        disconnect),
 			 END_OF_TEST_LIST
 			};
 
diff --git a/MQTTSNGateway/GatewayTester/src/LGwProxy.cpp b/MQTTSNGateway/GatewayTester/src/LGwProxy.cpp
index 47cc88a..7f5add1 100644
--- a/MQTTSNGateway/GatewayTester/src/LGwProxy.cpp
+++ b/MQTTSNGateway/GatewayTester/src/LGwProxy.cpp
@@ -55,6 +55,8 @@ LGwProxy::LGwProxy(){
 	_cleanSession = 0;
 	_pingStatus = 0;
 	_connectRetry = MQTTSN_RETRY_COUNT;
+	_tSleep = 0;
+	_tWake = 0;
 }
 
 LGwProxy::~LGwProxy(){
@@ -91,7 +93,7 @@ void LGwProxy::connect(){
 			strcpy(pos,_willTopic);        // WILLTOPIC
 			_status = GW_WAIT_WILLMSGREQ;
 			writeGwMsg();
-		}else if (_status == GW_CONNECTING || _status == GW_DISCONNECTED){
+		}else if (_status == GW_CONNECTING || _status == GW_DISCONNECTED || _status == GW_SLEPT ){
 			uint8_t clientIdLen = uint8_t(strlen(_clientId) > 23 ? 23 : strlen(_clientId));
 			*pos++ = 6 + clientIdLen;
 			*pos++ = MQTTSN_TYPE_CONNECT;
@@ -105,7 +107,7 @@ void LGwProxy::connect(){
 			strncpy(pos, _clientId, clientIdLen);
 			_msg[ 6 + clientIdLen] = 0;
 			_status = GW_WAIT_CONNACK;
-			if (_willMsg && _willTopic){
+			if ( _willMsg && _willTopic &&  _status != GW_SLEPT ){
 				if (strlen(_willMsg) && strlen(_willTopic)){
 					_msg[2] = _msg[2] | MQTTSN_FLAG_WILL;   // CONNECT
 					_status = GW_WAIT_WILLTOPICREQ;
@@ -163,10 +165,14 @@ int LGwProxy::getConnectResponce(void){
 		if (_mqttsnMsg[1] == MQTTSN_RC_ACCEPTED){
 			_status = GW_CONNECTED;
 			_connectRetry = MQTTSN_RETRY_COUNT;
-			_keepAliveTimer.start(_tkeepAlive * 1000);
-			_topicTbl.clearTopic();
-			DISPLAY("\033[0m\033[0;32m\n\n Connected to the Broker\033[0m\033[0;37m\n\n");
-			theClient->onConnect();  // SUBSCRIBEs are conducted
+			setPingReqTimer();
+			if ( _tSleep ){
+				_tSleep = 0;
+			}else{
+				DISPLAY("\033[0m\033[0;32m\n\n Connected to the Broker\033[0m\033[0;37m\n\n");
+				_topicTbl.clearTopic();
+				theClient->onConnect();  // SUBSCRIBEs are conducted
+			}
 		}else{
 			_status = GW_CONNECTING;
 		}
@@ -182,16 +188,18 @@ void LGwProxy::reconnect(void){
 
 void LGwProxy::disconnect(uint16_t secs){
     _tSleep = secs;
-    _status = GW_DISCONNECTING;
-    
+    _tWake = 0;
+
 	_msg[1] = MQTTSN_TYPE_DISCONNECT;
 
 	if (secs){
 		_msg[0] = 4;
 		setUint16((uint8_t*) _msg + 2, secs);
+		_status = GW_SLEEPING;
 	}else{
 		_msg[0] = 2;
 		_keepAliveTimer.stop();
+		_status = GW_DISCONNECTING;
 	}
 
 	_retryCount = MQTTSN_RETRY_COUNT;
@@ -223,9 +231,13 @@ int LGwProxy::getDisconnectResponce(void){
 		}
 		return 0;
 	}else if (_mqttsnMsg[0] == MQTTSN_TYPE_DISCONNECT){
-		if (_tSleep){
-			_status = GW_SLEEPING;
-			_keepAliveTimer.start(_tSleep);
+		if (_status == GW_SLEEPING ){
+			_status = GW_SLEPT;
+			uint32_t remain = _keepAliveTimer.getRemain();
+			theClient->setSleepMode(remain);
+
+			/* Wake up and starts from this point. */
+
 		}else{
 			_status = GW_DISCONNECTED;
 		}
@@ -279,7 +291,18 @@ int LGwProxy::getMessage(void){
     }else if (_mqttsnMsg[0] == MQTTSN_TYPE_PINGRESP){
         if (_pingStatus == GW_WAIT_PINGRESP){
             _pingStatus = 0;
-            resetPingReqTimer();
+            setPingReqTimer();
+
+            if ( _tSleep > 0 ){
+            	_tWake += _tkeepAlive;
+            	if ( _tWake < _tSleep ){
+            		theClient->setSleepMode(_tkeepAlive * 1000UL);
+            	}else{
+            		DISPLAY("\033[0m\033[0;32m\n\n Get back to ACTIVE.\033[0m\033[0;37m\n\n");
+            		_tWake = 0;
+            		connect();
+            	}
+            }
         }
     }else if (_mqttsnMsg[0] == MQTTSN_TYPE_DISCONNECT){
     	_status = GW_LOST;
@@ -408,7 +431,7 @@ void LGwProxy::checkPingReq(void){
 	msg[0] = 0x02;
 	msg[1] = MQTTSN_TYPE_PINGREQ;
     
-	if (_status == GW_CONNECTED && _keepAliveTimer.isTimeUp() && _pingStatus != GW_WAIT_PINGRESP){
+	if ( (_status == GW_CONNECTED || _status == GW_SLEPT) && isPingReqRequired() && _pingStatus != GW_WAIT_PINGRESP){
 		_pingStatus = GW_WAIT_PINGRESP;
         _pingRetryCount = MQTTSN_RETRY_COUNT;
 
@@ -449,8 +472,12 @@ LRegisterManager* LGwProxy::getRegisterManager(void){
 	return &_regMgr;
 }
 
-void LGwProxy::resetPingReqTimer(void){
-	_keepAliveTimer.start(_tkeepAlive * 1000);
+bool LGwProxy::isPingReqRequired(void){
+	return _keepAliveTimer.isTimeUp(_tkeepAlive * 1000UL);
+}
+
+void LGwProxy::setPingReqTimer(void){
+	_keepAliveTimer.start(_tkeepAlive * 1000UL);
 }
 
 const char* LGwProxy::getClientId(void) {
diff --git a/MQTTSNGateway/GatewayTester/src/LGwProxy.h b/MQTTSNGateway/GatewayTester/src/LGwProxy.h
index acbd37a..41d6078 100644
--- a/MQTTSNGateway/GatewayTester/src/LGwProxy.h
+++ b/MQTTSNGateway/GatewayTester/src/LGwProxy.h
@@ -66,7 +66,7 @@ public:
 	void     setAdvertiseDuration(uint16_t duration);
 	void     reconnect(void);
 	int      writeMsg(const uint8_t* msg);
-	void     resetPingReqTimer(void);
+	void     setPingReqTimer(void);
 	uint16_t getNextMsgId();
 	LTopicTable* getTopicTable(void);
 	LRegisterManager* getRegisterManager(void);
@@ -78,6 +78,7 @@ private:
 	void     checkAdvertise(void);
 	int      getConnectResponce(void);
 	int      getDisconnectResponce(void);
+	bool     isPingReqRequired(void);
 
 	LNetwork     _network;
 	uint8_t*    _mqttsnMsg;
@@ -103,6 +104,7 @@ private:
 	LTimer       _gwAliveTimer;
 	LTimer       _keepAliveTimer;
 	uint16_t    _tSleep;
+	uint16_t    _tWake;
 	char        _msg[MQTTSN_MAX_MSG_LENGTH + 1];
 };
 
diff --git a/MQTTSNGateway/GatewayTester/src/LMqttsnClient.cpp b/MQTTSNGateway/GatewayTester/src/LMqttsnClient.cpp
index 1779930..857af17 100644
--- a/MQTTSNGateway/GatewayTester/src/LMqttsnClient.cpp
+++ b/MQTTSNGateway/GatewayTester/src/LMqttsnClient.cpp
@@ -198,12 +198,17 @@ void LMqttsnClient::run()
 {
 	_gwProxy.connect();
 	_taskMgr.run();
-	sleep();
+}
+
+void LMqttsnClient::setSleepMode(uint32_t duration)
+{
+	// ToDo:  set WDT and sleep mode
+	DISPLAY("\033[0m\033[0;32m\n\n Get into SLEEP mode %u [msec].\033[0m\033[0;37m\n\n", duration);
 }
 
 void LMqttsnClient::sleep(void)
 {
-
+	disconnect(_sleepDuration);
 }
 
 void LMqttsnClient::setSleepDuration(uint32_t duration)
diff --git a/MQTTSNGateway/GatewayTester/src/LMqttsnClient.h b/MQTTSNGateway/GatewayTester/src/LMqttsnClient.h
index 8bdd70e..cf93048 100644
--- a/MQTTSNGateway/GatewayTester/src/LMqttsnClient.h
+++ b/MQTTSNGateway/GatewayTester/src/LMqttsnClient.h
@@ -59,6 +59,7 @@ public:
     void run(void);
     void addTask(bool test);
     void setSleepDuration(uint32_t duration);
+    void setSleepMode(uint32_t duration);
     void sleep(void);
 	const char* getClientId(void);
     LGwProxy*          getGwProxy(void);
diff --git a/MQTTSNGateway/GatewayTester/src/LNetworkUdp.cpp b/MQTTSNGateway/GatewayTester/src/LNetworkUdp.cpp
index 9fc8a1f..b61cf84 100644
--- a/MQTTSNGateway/GatewayTester/src/LNetworkUdp.cpp
+++ b/MQTTSNGateway/GatewayTester/src/LNetworkUdp.cpp
@@ -23,7 +23,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <fcntl.h>
-#include <errno.h>
 #include <termios.h>
 
 #include "LNetworkUdp.h"
diff --git a/MQTTSNGateway/GatewayTester/src/LPublishManager.cpp b/MQTTSNGateway/GatewayTester/src/LPublishManager.cpp
index 94d0886..d59dc02 100644
--- a/MQTTSNGateway/GatewayTester/src/LPublishManager.cpp
+++ b/MQTTSNGateway/GatewayTester/src/LPublishManager.cpp
@@ -150,7 +150,7 @@ void LPublishManager::sendPublish(PubElement* elm)
 	memcpy(msg + org + 7, elm->payload, elm->payloadlen);
 
 	theClient->getGwProxy()->writeMsg(msg);
-	theClient->getGwProxy()->resetPingReqTimer();
+	theClient->getGwProxy()->setPingReqTimer();
 	if ((elm->flag & 0x60) == MQTTSN_FLAG_QOS_0)
 	{
 		DISPLAY("\033[0m\033[0;32m Topic \"%s\" was Published. \033[0m\033[0;37m\n\n", elm->topicName);
diff --git a/MQTTSNGateway/GatewayTester/src/LScreen.cpp b/MQTTSNGateway/GatewayTester/src/LScreen.cpp
index f5a3fb8..5336a78 100644
--- a/MQTTSNGateway/GatewayTester/src/LScreen.cpp
+++ b/MQTTSNGateway/GatewayTester/src/LScreen.cpp
@@ -23,7 +23,6 @@
 #include <termios.h>
 #include <unistd.h>
 #include <fcntl.h>
-#include <errno.h>
 #include <stdarg.h>
 
 #include "LScreen.h"
diff --git a/MQTTSNGateway/GatewayTester/src/LSubscribeManager.cpp b/MQTTSNGateway/GatewayTester/src/LSubscribeManager.cpp
index d0c13bf..4424155 100644
--- a/MQTTSNGateway/GatewayTester/src/LSubscribeManager.cpp
+++ b/MQTTSNGateway/GatewayTester/src/LSubscribeManager.cpp
@@ -142,7 +142,7 @@ void LSubscribeManager::send(SubElement* elm)
 
 	theClient->getGwProxy()->connect();
 	theClient->getGwProxy()->writeMsg(msg);
-	theClient->getGwProxy()->resetPingReqTimer();
+	theClient->getGwProxy()->setPingReqTimer();
 	elm->sendUTC = time(NULL);
 	elm->retryCount--;
 }
diff --git a/MQTTSNGateway/GatewayTester/src/LTimer.cpp b/MQTTSNGateway/GatewayTester/src/LTimer.cpp
index dbc28d3..781693b 100644
--- a/MQTTSNGateway/GatewayTester/src/LTimer.cpp
+++ b/MQTTSNGateway/GatewayTester/src/LTimer.cpp
@@ -16,7 +16,6 @@
 
 #include <stdlib.h>
 #include <string.h>
-
 #include "LMqttsnClientApp.h"
 #include "LTimer.h"
 
@@ -63,3 +62,17 @@ void LTimer::stop(){
   _millis = 0;
 }
 
+uint32_t LTimer::getRemain(void)
+{
+    struct timeval curTime;
+    uint32_t secs, usecs;
+    if (_millis <= 0){
+        return 0;
+    }else{
+        gettimeofday(&curTime, 0);
+        secs  = (curTime.tv_sec  - _startTime.tv_sec) * 1000;
+        usecs = (curTime.tv_usec - _startTime.tv_usec) / 1000.0;
+        secs = _millis - (secs + usecs);
+        return secs;
+    }
+}
diff --git a/MQTTSNGateway/GatewayTester/src/LTimer.h b/MQTTSNGateway/GatewayTester/src/LTimer.h
index 27d6b5e..cb44cc0 100644
--- a/MQTTSNGateway/GatewayTester/src/LTimer.h
+++ b/MQTTSNGateway/GatewayTester/src/LTimer.h
@@ -35,6 +35,7 @@ public:
     bool isTimeUp(void);
     void stop(void);
     void changeUTC(void){};
+    uint32_t getRemain(void);
     static void setUnixTime(uint32_t utc){};
 private:
     struct timeval _startTime;
diff --git a/MQTTSNGateway/src/MQTTGWConnectionHandler.cpp b/MQTTSNGateway/src/MQTTGWConnectionHandler.cpp
index 8440142..dd351ae 100644
--- a/MQTTSNGateway/src/MQTTGWConnectionHandler.cpp
+++ b/MQTTSNGateway/src/MQTTGWConnectionHandler.cpp
@@ -76,14 +76,6 @@ void MQTTGWConnectionHandler::handleConnack(Client* client, MQTTGWPacket* packet
 	ev1->setClientSendEvent(client, snPacket);
 	client->connackSended(rc);  // update the client's status
 	_gateway->getClientSendQue()->post(ev1);
-
-	MQTTSNPacket* sleepPacket = 0;
-	while ( (sleepPacket = client->getClientSleepPacket()) )
-	{
-		Event* ev1 = new Event();
-		ev1->setClientSendEvent(client, sleepPacket);
-		_gateway->getClientSendQue()->post(ev1);
-	}
 }
 
 void MQTTGWConnectionHandler::handlePingresp(Client* client, MQTTGWPacket* packet)
diff --git a/MQTTSNGateway/src/MQTTGWPacket.cpp b/MQTTSNGateway/src/MQTTGWPacket.cpp
index 0f87572..8bba53f 100644
--- a/MQTTSNGateway/src/MQTTGWPacket.cpp
+++ b/MQTTSNGateway/src/MQTTGWPacket.cpp
@@ -543,3 +543,20 @@ char* MQTTGWPacket::print(char* pbuf)
 	return ptr;
 }
 
+MQTTGWPacket& MQTTGWPacket::operator =(MQTTGWPacket& packet)
+{
+	clearData();
+	this->_header.byte = packet._header.byte;
+	this->_remainingLength = packet._remainingLength;
+	_data = (unsigned char*)calloc(_remainingLength, 1);
+	if (_data)
+	{
+		memcpy(this->_data, packet._data, _remainingLength);
+	}
+	else
+	{
+		clearData();
+	}
+	return *this;
+}
+
diff --git a/MQTTSNGateway/src/MQTTGWPacket.h b/MQTTSNGateway/src/MQTTGWPacket.h
index ecba6bb..458dd4d 100644
--- a/MQTTSNGateway/src/MQTTGWPacket.h
+++ b/MQTTSNGateway/src/MQTTGWPacket.h
@@ -205,6 +205,7 @@ public:
 	int setUNSUBSCRIBE(const char* topics, unsigned short msgid);
 	char* getMsgId(char* buf);
 	char* print(char* buf);
+	MQTTGWPacket& operator =(MQTTGWPacket& packet);
 
 private:
 	void  clearData(void);
diff --git a/MQTTSNGateway/src/MQTTGWPublishHandler.cpp b/MQTTSNGateway/src/MQTTGWPublishHandler.cpp
index 67d3df7..cfd6772 100644
--- a/MQTTSNGateway/src/MQTTGWPublishHandler.cpp
+++ b/MQTTSNGateway/src/MQTTGWPublishHandler.cpp
@@ -36,9 +36,39 @@ MQTTGWPublishHandler::~MQTTGWPublishHandler()
 
 void MQTTGWPublishHandler::handlePublish(Client* client, MQTTGWPacket* packet)
 {
-	if ( !client->isActive() && !client->isSleep() )
+	if ( !client->isActive() && !client->isSleep() && !client->isAwake())
 	{
-		WRITELOG("     The client is neither active nor sleep %s\n", client->getStatus());
+		WRITELOG("%s     The client is neither active nor sleep %s%s\n", ERRMSG_HEADER, client->getStatus(), ERRMSG_FOOTER);
+		return;
+	}
+
+	/* client is sleeping. save PUBLISH */
+	if ( client->isSleep() )
+	{
+		Publish pub;
+		packet->getPUBLISH(&pub);
+
+		WRITELOG(FORMAT_Y_G_G, currentDateTime(), packet->getName(),
+		RIGHTARROW, client->getClientId(), "is sleeping. a message was saved.");
+
+		if (pub.header.bits.qos == 1)
+		{
+			replyACK(client, &pub, PUBACK);
+		}
+		else if ( pub.header.bits.qos == 2)
+		{
+			replyACK(client, &pub, PUBREC);
+		}
+
+		MQTTGWPacket* msg = new MQTTGWPacket();
+		*msg = *packet;
+		if ( msg->getType() == 0 )
+		{
+			WRITELOG("%s MQTTGWPublishHandler::handlePublish can't allocate memories for Packet.%s\n", ERRMSG_HEADER,ERRMSG_FOOTER);
+			delete msg;
+			return;
+		}
+		client->setClientSleepPacket(msg);
 		return;
 	}
 
@@ -102,19 +132,10 @@ void MQTTGWPublishHandler::handlePublish(Client* client, MQTTGWPacket* packet)
 				uint16_t regackMsgId = client->getNextSnMsgId();
 				regPacket->setREGISTER(id, regackMsgId, &topicName);
 
-				if (client->isSleep())
-				{
-					client->setClientSleepPacket(regPacket);
-					WRITELOG(FORMAT_BL_NL, currentDateTime(), regPacket->getName(),
-					RIGHTARROW, client->getClientId(), "is sleeping. REGISTER was saved.");
-				}
-				else if (client->isActive())
-				{
-					/* send REGISTER */
-					Event* evrg = new Event();
-					evrg->setClientSendEvent(client, regPacket);
-					_gateway->getClientSendQue()->post(evrg);
-				}
+				/* send REGISTER */
+				Event* evrg = new Event();
+				evrg->setClientSendEvent(client, regPacket);
+				_gateway->getClientSendQue()->post(evrg);
 
 				/* send PUBLISH */
 				topicId.data.id = id;
@@ -125,47 +146,18 @@ void MQTTGWPublishHandler::handlePublish(Client* client, MQTTGWPacket* packet)
 			}
 			else
 			{
-				WRITELOG("\x1b[0m\x1b[31mMQTTGWPublishHandler Can't create a Topic.\n");
+				WRITELOG("%sMQTTGWPublishHandler Can't create a Topic.%s\n", ERRMSG_HEADER,ERRMSG_FOOTER);
 				delete snPacket;
 				return;
 			}
 		}
 	}
 
-	/* TopicId was acquired. */
-	if (client->isSleep())
-	{
-		/* client is sleeping. save PUBLISH */
-		client->setClientSleepPacket(snPacket);
-		WRITELOG(FORMAT_Y_G_G, currentDateTime(), packet->getName(),
-		RIGHTARROW, client->getClientId(), "is sleeping. a message was saved.");
-		int type = 0;
-		if (pub.header.bits.qos == 1)
-		{
-			type = PUBACK;
-		}
-		else if ( pub.header.bits.qos == 2)
-		{
-			WRITELOG(" While Client is sleeping, QoS2 is not supported.\n");
-			type = PUBREC;
-		}
-		replyACK(client, &pub, type);
-		pub.header.bits.qos = 0;
-		replyACK(client, &pub, PUBACK);
-		pub.msgId = 0;
-		snPacket->setPUBLISH((uint8_t) pub.header.bits.dup, (int) pub.header.bits.qos,
-				(uint8_t) pub.header.bits.retain, (uint16_t) pub.msgId, topicId, (uint8_t*) pub.payload,
-				pub.payloadlen);
-		client->setClientSleepPacket(snPacket);
-	}
-	else if (client->isActive())
-	{
-		snPacket->setPUBLISH((uint8_t) pub.header.bits.dup, (int) pub.header.bits.qos, (uint8_t) pub.header.bits.retain,
-				(uint16_t) pub.msgId, topicId, (uint8_t*) pub.payload, pub.payloadlen);
-		Event* ev1 = new Event();
-		ev1->setClientSendEvent(client, snPacket);
-		_gateway->getClientSendQue()->post(ev1);
-	}
+	snPacket->setPUBLISH((uint8_t) pub.header.bits.dup, (int) pub.header.bits.qos, (uint8_t) pub.header.bits.retain,
+			(uint16_t) pub.msgId, topicId, (uint8_t*) pub.payload, pub.payloadlen);
+	Event* ev1 = new Event();
+	ev1->setClientSendEvent(client, snPacket);
+	_gateway->getClientSendQue()->post(ev1);
 
 }
 
@@ -201,22 +193,37 @@ void MQTTGWPublishHandler::handleAck(Client* client, MQTTGWPacket* packet, int t
 {
 	Ack ack;
 	packet->getAck(&ack);
-	MQTTSNPacket* mqttsnPacket = new MQTTSNPacket();
-	if (type == PUBREC)
-	{
-		mqttsnPacket->setPUBREC((uint16_t) ack.msgId);
-	}
-	else if (type == PUBREL)
-	{
-		mqttsnPacket->setPUBREL((uint16_t) ack.msgId);
-	}
-	else if (type == PUBCOMP)
-	{
-		mqttsnPacket->setPUBCOMP((uint16_t) ack.msgId);
-	}
 
-	Event* ev1 = new Event();
-	ev1->setClientSendEvent(client, mqttsnPacket);
-	_gateway->getClientSendQue()->post(ev1);
+	if ( client->isActive() || client->isAwake() )
+	{
+		MQTTSNPacket* mqttsnPacket = new MQTTSNPacket();
+		if (type == PUBREC)
+		{
+			mqttsnPacket->setPUBREC((uint16_t) ack.msgId);
+		}
+		else if (type == PUBREL)
+		{
+			mqttsnPacket->setPUBREL((uint16_t) ack.msgId);
+		}
+		else if (type == PUBCOMP)
+		{
+			mqttsnPacket->setPUBCOMP((uint16_t) ack.msgId);
+		}
+
+		Event* ev1 = new Event();
+		ev1->setClientSendEvent(client, mqttsnPacket);
+		_gateway->getClientSendQue()->post(ev1);
+	}
+	else if ( client->isSleep() )
+	{
+		if (type == PUBREL)
+		{
+			MQTTGWPacket* pubComp = new MQTTGWPacket();
+			pubComp->setAck(PUBCOMP, (uint16_t)ack.msgId);
+			Event* ev1 = new Event();
+			ev1->setBrokerSendEvent(client, pubComp);
+			_gateway->getBrokerSendQue()->post(ev1);
+		}
+	}
 }
 
diff --git a/MQTTSNGateway/src/MQTTSNGWClient.cpp b/MQTTSNGateway/src/MQTTSNGWClient.cpp
index 93bee22..d31e3f0 100644
--- a/MQTTSNGateway/src/MQTTSNGWClient.cpp
+++ b/MQTTSNGateway/src/MQTTSNGWClient.cpp
@@ -23,7 +23,7 @@
 #include <stdio.h>
 
 using namespace MQTTSNGW;
-
+char* currentDateTime(void);
 /*=====================================
  Class ClientList
  =====================================*/
@@ -185,7 +185,6 @@ Client* ClientList::getClient(uint8_t* clientId)
 
 	while (client != 0)
 	{
-		//printf("ClientList: clientId = %s\n", client->getClientId());
 		if (strcmp((const char*)client->getClientId(), (const char*)clientId) == 0 )
 		{
 			_mutex.unlock();
@@ -259,7 +258,7 @@ bool ClientList::isAuthorized()
 /*=====================================
  Class Client
  =====================================*/
-static const char* theClientStatus[] = { "Disconnected", "TryConnecting", "Connecting", "Active", "Awake", "Asleep", "Lost" };
+static const char* theClientStatus[] = { "Disconnected", "TryConnecting", "Connecting", "Active", "Asleep", "Awake", "Lost" };
 
 Client::Client(bool secure)
 {
@@ -288,6 +287,7 @@ Client::Client(bool secure)
 	_otaClient = 0;
 	_prevClient = 0;
 	_nextClient = 0;
+	_clientSleepPacketQue.setMaxSize(MAX_SAVED_PUBLISH);
 }
 
 Client::~Client()
@@ -335,11 +335,30 @@ uint16_t Client::getWaitedSubTopicId(uint16_t msgId)
 	return _waitedSubTopicIdMap.getTopicId(msgId, &type);
 }
 
-MQTTSNPacket* Client::getClientSleepPacket()
+MQTTGWPacket* Client::getClientSleepPacket()
 {
 	return _clientSleepPacketQue.getPacket();
 }
 
+void Client::deleteFirstClientSleepPacket()
+{
+	_clientSleepPacketQue.pop();
+}
+
+int Client::setClientSleepPacket(MQTTGWPacket* packet)
+{
+	int rc = _clientSleepPacketQue.post(packet);
+	if ( rc )
+	{
+		WRITELOG("%s    %s is sleeping. the packet was saved.\n", currentDateTime(), _clientId);
+	}
+	else
+	{
+		WRITELOG("%s    %s is sleeping　but discard the packet.\n", currentDateTime(), _clientId);
+	}
+	return rc;
+}
+
 Connect* Client::getConnectData(void)
 {
 	return &_connectData;
@@ -374,12 +393,6 @@ void Client::setWaitedSubTopicId(uint16_t msgId, uint16_t topicId, MQTTSN_topicT
 	_waitedSubTopicIdMap.add(msgId, topicId, type);
 }
 
-void Client::setClientSleepPacket(MQTTSNPacket* packet)
-{
-	updateStatus(packet);
-	_clientSleepPacketQue.post(packet);
-}
-
 bool Client::checkTimeover(void)
 {
 	return (_status == Cstat_Active && _keepAliveTimer.isTimeup());
@@ -426,51 +439,34 @@ void Client::updateStatus(MQTTSNPacket* packet)
 			_keepAliveTimer.start(_keepAliveMsec * 1.5);
 			break;
 		case MQTTSN_DISCONNECT:
-		{
 			uint16_t duration;
 			packet->getDISCONNECT(&duration);
 			if (duration)
 			{
 				_status = Cstat_Asleep;
-				_keepAliveMsec = duration * 1000UL;
 			}
 			else
 			{
 				disconnected();
 			}
-		}
 			break;
 		default:
 			break;
 		}
-
 	}
-	else if (_status == Cstat_Asleep)
-	{
-		if (packet->getType() == MQTTSN_CONNECT)
-		{
-			setKeepAlive(packet);
-			_status = Cstat_Connecting;
-		}
-		else if (packet->getType() == MQTTSN_PINGREQ)
-		{
-			if ( packet->getPINGREQ() > 0 )
-			{
-				_status = Cstat_Awake;
-			}
-		}
-	}
-	else if (_status == Cstat_Awake)
+	else if (_status == Cstat_Awake || _status == Cstat_Asleep)
 	{
 		switch (packet->getType())
 		{
 		case MQTTSN_CONNECT:
-			_status = Cstat_Connecting;
-			setKeepAlive(packet);
+			_status = Cstat_Active;
 			break;
 		case MQTTSN_DISCONNECT:
 			disconnected();
 			break;
+		case MQTTSN_PINGREQ:
+			_status = Cstat_Awake;
+			break;
 		case MQTTSN_PINGRESP:
 			_status = Cstat_Asleep;
 			break;
@@ -478,6 +474,7 @@ void Client::updateStatus(MQTTSNPacket* packet)
 			break;
 		}
 	}
+	DEBUGLOG("Client Status = %s\n", theClientStatus[_status]);
 }
 
 void Client::updateStatus(ClientStatus stat)
@@ -595,6 +592,11 @@ bool Client::isSleep(void)
 	return (_status == Cstat_Asleep);
 }
 
+bool Client::isAwake(void)
+{
+	return (_status == Cstat_Awake);
+}
+
 bool Client::isSecureNetwork(void)
 {
 	return _secureNetwork;
diff --git a/MQTTSNGateway/src/MQTTSNGWClient.h b/MQTTSNGateway/src/MQTTSNGWClient.h
index 76c5c11..690f98b 100644
--- a/MQTTSNGateway/src/MQTTSNGWClient.h
+++ b/MQTTSNGateway/src/MQTTSNGWClient.h
@@ -43,6 +43,7 @@ public:
 		_que = new Que<T>;
 	}
 
+
 	~PacketQue()
 	{
 		clear();
@@ -65,11 +66,14 @@ public:
 		}
 	}
 
-	void post(T* packet)
+	int
+	post(T* packet)
 	{
+		int rc;
 		_mutex.lock();
-		_que->post(packet);
+		rc = _que->post(packet);
 		_mutex.unlock();
+		return rc;
 	}
 
 	void pop()
@@ -93,6 +97,11 @@ public:
 		_mutex.unlock();
 	}
 
+	void setMaxSize(int size)
+	{
+		_que->setMaxSize(size);
+	}
+
 private:
 	Que<T>* _que;
 	Mutex _mutex;
@@ -232,7 +241,8 @@ public:
 	Connect* getConnectData(void);
 	uint16_t getWaitedPubTopicId(uint16_t msgId);
 	uint16_t getWaitedSubTopicId(uint16_t msgId);
-	MQTTSNPacket* getClientSleepPacket();
+	MQTTGWPacket* getClientSleepPacket(void);
+	void deleteFirstClientSleepPacket(void);
 	WaitREGACKPacketList* getWaitREGACKPacketList(void);
 
 	void eraseWaitedPubTopicId(uint16_t msgId);
@@ -240,7 +250,7 @@ public:
 	void clearWaitedPubTopicId(void);
 	void clearWaitedSubTopicId(void);
 
-	void setClientSleepPacket(MQTTSNPacket*);
+	int  setClientSleepPacket(MQTTGWPacket*);
 	void setWaitedPubTopicId(uint16_t msgId, uint16_t topicId, MQTTSN_topicTypes type);
 	void setWaitedSubTopicId(uint16_t msgId, uint16_t topicId, MQTTSN_topicTypes type);
 
@@ -277,6 +287,7 @@ public:
 	bool isDisconnect(void);
 	bool isActive(void);
 	bool isSleep(void);
+	bool isAwake(void);
 	bool isSecureNetwork(void);
 	bool isSensorNetStable(void);
 	bool isWaitWillMsg(void);
@@ -286,7 +297,7 @@ public:
 	void    setOTAClient(Client* cl);
 
 private:
-	PacketQue<MQTTSNPacket> _clientSleepPacketQue;
+	PacketQue<MQTTGWPacket> _clientSleepPacketQue;
 	WaitREGACKPacketList    _waitREGACKList;
 
 	Topics* _topics;
diff --git a/MQTTSNGateway/src/MQTTSNGWConnectionHandler.cpp b/MQTTSNGateway/src/MQTTSNGWConnectionHandler.cpp
index 9512ad5..9cf5ccc 100644
--- a/MQTTSNGateway/src/MQTTSNGWConnectionHandler.cpp
+++ b/MQTTSNGateway/src/MQTTSNGWConnectionHandler.cpp
@@ -74,7 +74,18 @@ void MQTTSNConnectionHandler::handleConnect(Client* client, MQTTSNPacket* packet
 		return;
 	}
 
-	/* clear ConnectData of Client */
+	/* return CONNACK when the client is sleeping */
+	if ( client->isSleep() || client->isAwake() )
+	{
+		MQTTSNPacket* packet = new MQTTSNPacket();
+		packet->setCONNACK(MQTTSN_RC_ACCEPTED);
+		Event* ev = new Event();
+		ev->setClientSendEvent(client, packet);
+		_gateway->getClientSendQue()->post(ev);
+		return;
+	}
+
+	//* clear ConnectData of Client */
 	Connect* connectData = client->getConnectData();
 	memset(connectData, 0, sizeof(Connect));
 	client->disconnected();
@@ -125,7 +136,6 @@ void MQTTSNConnectionHandler::handleConnect(Client* client, MQTTSNPacket* packet
 	}
 	else
 	{
-
 		/* CONNECT message was not qued in.
 		 * create CONNECT message & send it to the broker */
 		MQTTGWPacket* mqMsg = new MQTTGWPacket();
@@ -259,6 +269,21 @@ void MQTTSNConnectionHandler::handleWillmsgupd(Client* client, MQTTSNPacket* pac
  */
 void MQTTSNConnectionHandler::handlePingreq(Client* client, MQTTSNPacket* packet)
 {
+	MQTTGWPacket* msg = 0;
+
+	if ( client->isSleep() || client->isAwake() )
+	{
+		while  ( ( msg = client->getClientSleepPacket() ) != 0 )
+		{
+			// ToDo:  This version can't re-send PUBLISH when PUBACK is not returned.
+			client->deleteFirstClientSleepPacket();  // pop the que to delete element.
+
+			Event* ev = new Event();
+			ev->setBrokerRecvEvent(client, msg);
+			_gateway->getPacketEventQue()->post(ev);
+		}
+	}
+
 	/* send PINGREQ to the broker */
 	MQTTGWPacket* pingreq = new MQTTGWPacket();
 	pingreq->setHeader(PINGREQ);
diff --git a/MQTTSNGateway/src/MQTTSNGWDefines.h b/MQTTSNGateway/src/MQTTSNGWDefines.h
index 96f73f6..a21f6de 100644
--- a/MQTTSNGateway/src/MQTTSNGWDefines.h
+++ b/MQTTSNGateway/src/MQTTSNGWDefines.h
@@ -19,6 +19,7 @@
 
 namespace MQTTSNGW
 {
+#define DEBUG
 /*=================================
  *    Config Parametrs
  ==================================*/
@@ -38,6 +39,7 @@ namespace MQTTSNGW
 #define MAX_CLIENTS                 (100)  // Number of Clients can be handled.
 #define MAX_CLIENTID_LENGTH          (64)  // Max length of clientID
 #define MAX_INFLIGHTMESSAGES         (10)  // Number of inflight messages
+#define MAX_SAVED_PUBLISH            (20)  // Max number of PUBLISH message for Asleep state
 #define MQTTSNGW_MAX_PACKET_SIZE   (1024)  // Max Packet size  (5+2+TopicLen+PayloadLen)
 #define SIZE_OF_LOG_PACKET          (500)  // Length of the packet log in bytes
 
diff --git a/MQTTSNGateway/src/MQTTSNGWPublishHandler.cpp b/MQTTSNGateway/src/MQTTSNGWPublishHandler.cpp
index b4e091e..52dff3e 100644
--- a/MQTTSNGateway/src/MQTTSNGWPublishHandler.cpp
+++ b/MQTTSNGateway/src/MQTTSNGWPublishHandler.cpp
@@ -178,27 +178,26 @@ void MQTTSNPublishHandler::handlePuback(Client* client, MQTTSNPacket* packet)
 	uint16_t msgId;
 	uint8_t rc;
 
-	if ( !client->isActive() )
+	if ( client->isActive() )
 	{
-		return;
-	}
-	MQTTGWPacket* pubAck = new MQTTGWPacket();
+		MQTTGWPacket* pubAck = new MQTTGWPacket();
 
-	if ( packet->getPUBACK(&topicId, &msgId, &rc) == 0 )
-	{
-		return;
-	}
+		if ( packet->getPUBACK(&topicId, &msgId, &rc) == 0 )
+		{
+			return;
+		}
 
-	if ( rc == MQTTSN_RC_ACCEPTED)
-	{
-		pubAck->setAck(PUBACK, msgId);
-		Event* ev1 = new Event();
-		ev1->setBrokerSendEvent(client, pubAck);
-		_gateway->getBrokerSendQue()->post(ev1);
-	}
-	else if ( rc == MQTTSN_RC_REJECTED_INVALID_TOPIC_ID)
-	{
-		WRITELOG("  PUBACK   %d : Invalid Topic ID\n", msgId);
+		if ( rc == MQTTSN_RC_ACCEPTED)
+		{
+			pubAck->setAck(PUBACK, msgId);
+			Event* ev1 = new Event();
+			ev1->setBrokerSendEvent(client, pubAck);
+			_gateway->getBrokerSendQue()->post(ev1);
+		}
+		else if ( rc == MQTTSN_RC_REJECTED_INVALID_TOPIC_ID)
+		{
+			WRITELOG("  PUBACK   %d : Invalid Topic ID\n", msgId);
+		}
 	}
 }
 
@@ -206,19 +205,18 @@ void MQTTSNPublishHandler::handleAck(Client* client, MQTTSNPacket* packet, uint8
 {
 	uint16_t msgId;
 
-	if ( !client->isActive() )
+	if ( client->isActive() )
 	{
-		return;
+		if ( packet->getACK(&msgId) == 0 )
+		{
+			return;
+		}
+		MQTTGWPacket* ackPacket = new MQTTGWPacket();
+		ackPacket->setAck(packetType, msgId);
+		Event* ev1 = new Event();
+		ev1->setBrokerSendEvent(client, ackPacket);
+		_gateway->getBrokerSendQue()->post(ev1);
 	}
-	if ( packet->getACK(&msgId) == 0 )
-	{
-		return;
-	}
-	MQTTGWPacket* ackPacket = new MQTTGWPacket();
-	ackPacket->setAck(packetType, msgId);
-	Event* ev1 = new Event();
-	ev1->setBrokerSendEvent(client, ackPacket);
-	_gateway->getBrokerSendQue()->post(ev1);
 }
 
 void MQTTSNPublishHandler::handleRegister(Client* client, MQTTSNPacket* packet)
@@ -229,24 +227,23 @@ void MQTTSNPublishHandler::handleRegister(Client* client, MQTTSNPacket* packet)
 	MQTTSN_topicid topicid;
 
 
-	if ( !client->isActive() )
+	if ( client->isActive() || client->isAwake())
 	{
-		return;
-	}
-	MQTTSNPacket* regAck = new MQTTSNPacket();
-	if ( packet->getREGISTER(&id, &msgId, &topicName) == 0 )
-	{
-		return;
-	}
+		MQTTSNPacket* regAck = new MQTTSNPacket();
+		if ( packet->getREGISTER(&id, &msgId, &topicName) == 0 )
+		{
+			return;
+		}
 
-	topicid.type = MQTTSN_TOPIC_TYPE_NORMAL;
-	topicid.data.long_.len = topicName.lenstring.len;
-	topicid.data.long_.name = topicName.lenstring.data;
+		topicid.type = MQTTSN_TOPIC_TYPE_NORMAL;
+		topicid.data.long_.len = topicName.lenstring.len;
+		topicid.data.long_.name = topicName.lenstring.data;
 
-	id = client->getTopics()->add(&topicid)->getTopicId();
-	regAck->setREGACK(id, msgId, MQTTSN_RC_ACCEPTED);
-	Event* ev = new Event();
-	ev->setClientSendEvent(client, regAck);
-	_gateway->getClientSendQue()->post(ev);
+		id = client->getTopics()->add(&topicid)->getTopicId();
+		regAck->setREGACK(id, msgId, MQTTSN_RC_ACCEPTED);
+		Event* ev = new Event();
+		ev->setClientSendEvent(client, regAck);
+		_gateway->getClientSendQue()->post(ev);
+	}
 
 }
diff --git a/MQTTSNGateway/src/linux/Timer.h b/MQTTSNGateway/src/linux/Timer.h
index 43885b1..7935f4f 100644
--- a/MQTTSNGateway/src/linux/Timer.h
+++ b/MQTTSNGateway/src/linux/Timer.h
@@ -16,8 +16,10 @@
 #ifndef MQTTSNGATEWAY_SRC_LINUX_TIMER_H_
 #define MQTTSNGATEWAY_SRC_LINUX_TIMER_H_
 
+#include <stdint.h>
+#include <sys/time.h>
 #include "MQTTSNGWDefines.h"
-#include <time.h>
+
 namespace MQTTSNGW
 {
 /*==========================================================
diff --git a/MQTTSNGateway/src/linux/udp/SensorNetwork.cpp b/MQTTSNGateway/src/linux/udp/SensorNetwork.cpp
index 18eace4..6f08481 100644
--- a/MQTTSNGateway/src/linux/udp/SensorNetwork.cpp
+++ b/MQTTSNGateway/src/linux/udp/SensorNetwork.cpp
@@ -21,7 +21,6 @@
 #include <arpa/inet.h>
 #include <netdb.h>
 #include <string.h>
-#include <errno.h>
 #include <regex>
 #include <string>
 #include <stdlib.h>
diff --git a/MQTTSNGateway/src/linux/udp6/SensorNetwork.cpp b/MQTTSNGateway/src/linux/udp6/SensorNetwork.cpp
index 07f5ad3..3ff93fd 100644
--- a/MQTTSNGateway/src/linux/udp6/SensorNetwork.cpp
+++ b/MQTTSNGateway/src/linux/udp6/SensorNetwork.cpp
@@ -25,7 +25,6 @@
 #include <netdb.h>
 #include <string.h>
 #include <iostream>
-#include <errno.h>
 #include <regex>
 #include <string>
 #include <stdlib.h>
diff --git a/MQTTSNGateway/src/linux/xbee/SensorNetwork.cpp b/MQTTSNGateway/src/linux/xbee/SensorNetwork.cpp
index 1a806a7..65b9946 100644
--- a/MQTTSNGateway/src/linux/xbee/SensorNetwork.cpp
+++ b/MQTTSNGateway/src/linux/xbee/SensorNetwork.cpp
@@ -18,10 +18,8 @@
 #include <unistd.h>
 #include <termios.h>
 #include <fcntl.h>
-#include <errno.h>
 #include <string.h>
 #include <stdlib.h>
-
 #include "SensorNetwork.h"
 #include "MQTTSNGWProcess.h"