First Commit of MQTT-SN Gateway

Add    new SensorNetwork XBee
Add    a sensor network type in a start message.
Update MQTTSNClient to avoid build warning.
Update WiringPi's functions to my original ones. 
BugFix check msgId before adding waitdTopicId table.
BugFix Process termination procedures
Update print curent time in millseconds.
update move currentDateTime() to linux directory.
Bugfix: blink blue lightiIndicator.
Bugfix: Register returns wrong id.
change a status of the client to Disconnected.
change client status procedure
Update README
BugFix: change Network Disconnect procedures.

Signed-off-by: tomoaki <tomoaki@tomy-tech.com>

MQTTSNGateway/src/MQTTGWConnectionHandler.h

@@ -0,0 +1,42 @@
+/**************************************************************************************
+ * Copyright (c) 2016, Tomoaki Yamaguchi
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and Eclipse Distribution License v1.0 which accompany this distribution.
+ *
+ * The Eclipse Public License is available at
+ *    http://www.eclipse.org/legal/epl-v10.html
+ * and the Eclipse Distribution License is available at
+ *   http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * Contributors:
+ *    Tomoaki Yamaguchi - initial API and implementation and/or initial documentation
+ **************************************************************************************/
+#ifndef MQTTGWCONNECTIONHANDLER_H_
+#define MQTTGWCONNECTIONHANDLER_H_
+
+#include "MQTTSNGWDefines.h"
+#include "MQTTSNGWPacket.h"
+#include "MQTTSNGateway.h"
+
+namespace MQTTSNGW
+{
+
+class MQTTGWConnectionHandler
+{
+public:
+	MQTTGWConnectionHandler(Gateway* gateway);
+	~MQTTGWConnectionHandler();
+	void handleConnack(Client* client, MQTTGWPacket* packet);
+	void handlePingresp(Client* client, MQTTGWPacket* packet);
+	void handleDisconnect(Client* client, MQTTGWPacket* packet);
+
+private:
+	Gateway* _gateway;
+};
+
+}
+
+
+#endif /* MQTTGWCONNECTIONHANDLER_H_ */