Add: Two Gateway Test programs

BugFix: invalid pointer

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

MQTTSNGateway/GatewayTester/src/LMqttsnClient.h

@@ -62,6 +62,7 @@ public:
     void setSleepMode(uint32_t duration);
     void sleep(void);
 	const char* getClientId(void);
+	uint16_t getTopicId(const char* topicName);
     LGwProxy*          getGwProxy(void);
     LPublishManager*   getPublishManager(void);
     LSubscribeManager* getSubscribeManager(void);