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/linux/udp/SensorNetwork.h

@@ -0,0 +1,114 @@
+/**************************************************************************************
+ * 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 SENSORNETWORK_H_
+#define SENSORNETWORK_H_
+
+#include "MQTTSNGWDefines.h"
+#include <string>
+
+using namespace std;
+
+namespace MQTTSNGW
+{
+
+#ifdef  DEBUG_NWSTACK
+  #define D_NWSTACK(...) printf(__VA_ARGS__)
+#else
+  #define D_NWSTACK(...)
+#endif
+
+#define SENSORNETWORK_TYPE "UDP"
+/*===========================================
+ Class  SensorNetAddreess
+ ============================================*/
+class SensorNetAddress
+{
+public:
+	SensorNetAddress();
+	~SensorNetAddress();
+	void setAddress(uint32_t IpAddr, uint16_t port);
+	int  setAddress(string* data);
+	uint32_t getIpAddress(void)
+	{
+		return _IpAddr;
+	}
+	uint16_t getPortNo(void)
+	{
+		return _portNo;
+	}
+	bool isMatch(SensorNetAddress* addr);
+	SensorNetAddress& operator =(SensorNetAddress& addr);
+
+private:
+	uint16_t _portNo;
+	uint32_t _IpAddr;
+};
+
+/*========================================
+ Class UpdPort
+ =======================================*/
+class UDPPort
+{
+public:
+	UDPPort();
+	virtual ~UDPPort();
+
+	int open(char* ipAddress, uint16_t multiPortNo,	uint16_t uniPortNo);
+	void close(void);
+	int unicast(const uint8_t* buf, uint32_t length, SensorNetAddress* sendToAddr);
+	int broadcast(const uint8_t* buf, uint32_t length);
+	int recv(uint8_t* buf, uint16_t len, SensorNetAddress* addr);
+
+private:
+	void setNonBlocking(const bool);
+	int recvfrom(int sockfd, uint8_t* buf, uint16_t len, uint8_t flags,	SensorNetAddress* addr);
+
+	int _sockfdUnicast;
+	int _sockfdMulticast;
+
+	SensorNetAddress _grpAddr;
+	SensorNetAddress _clientAddr;
+	bool _disconReq;
+
+};
+
+/*===========================================
+ Class  SensorNetwork
+ ============================================*/
+class SensorNetwork: public UDPPort
+{
+public:
+	SensorNetwork();
+	~SensorNetwork();
+
+	int unicast(const uint8_t* payload, uint16_t payloadLength, SensorNetAddress* sendto);
+	int broadcast(const uint8_t* payload, uint16_t payloadLength);
+	int read(uint8_t* buf, uint16_t bufLen);
+	int initialize(void);
+	const char* getType(void);
+	SensorNetAddress* getSenderAddress(void)
+	{
+		return &_clientAddr;
+	}
+
+
+private:
+	SensorNetAddress _clientAddr;   // Sender's address. not gateway's one.
+};
+
+}
+#endif /* SENSORNETWORK_H_ */