Diff: mbed-mqtt-master/paho_mqtt-sn_embedded_c/MQTTSNGateway/README.md

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+# MQTT-SN Transparent / Aggrigating Gateway
+
+**MQTT-SN** requires a MQTT-SN Gateway which acts as a protocol converter to convert **MQTT-SN messages to MQTT messages**. MQTT-SN client over SensorNetwork can not communicate directly with MQTT broker(TCP/IP).   
+This Gateway can run as a transparent or aggrigating Gateway by specifying the gateway.conf.
+
+### **step1. Build the gateway**   
+````
+$ git clone -b experiment https://github.com/eclipse/paho.mqtt-sn.embedded-c   
+$ cd paho.mqtt-sn.embedded-c/MQTTSNGateway       
+$ make   
+$ make install   
+$ make clean    
+````      
+MQTT-SNGateway, MQTT-SNLogmonitor and *.conf files are copied into ../ directory.    
+If you want to install the gateway into specific directories, enter a command line as follows:
+````
+$ make install INSTALL_DIR=/path/to/your_directory CONFIG_DIR=/path/to/your_directory
+````
+
+    
+### **step2. Execute the Gateway.**     
+
+````    
+$ cd ../   
+$ ./MQTT-SNGateway [-f Config file name]
+````   
+
+
+### **How to Change the configuration of the gateway**    
+**../gateway.conf**   Contents are follows: 
+   
+<pre><dev>    
+
+# config file of MQTT-SN Gateway
+#
+
+BrokerName=iot.eclipse.org
+BrokerPortNo=1883
+BrokerSecurePortNo=8883
+
+#
+# When AggregatingGateway=YES or ClientAuthentication=YES,
+# All clients must be specified by the ClientList File  
+#
+
+ClientAuthentication=NO
+AggregatingGateway=NO
+QoS-1=NO
+Forwarder=NO
+
+#ClientsList=/path/to/your_clients.conf
+
+PredefinedTopic=NO
+#PredefinedTopicList=/path/to/your_predefinedTopic.conf
+
+#RootCAfile=/etc/ssl/certs/ca-certificates.crt
+#RootCApath=/etc/ssl/certs/
+#CertsFile=/path/to/certKey.pem
+#PrivateKey=/path/to/privateKey.pem
+
+GatewayID=1
+GatewayName=PahoGateway-01
+KeepAlive=900
+#LoginID=your_ID
+#Password=your_Password
+
+
+# UDP
+GatewayPortNo=10000
+MulticastIP=225.1.1.1
+MulticastPortNo=1883
+
+# XBee
+Baudrate=38400
+SerialDevice=/dev/ttyUSB0
+ApiMode=2
+
+# LOG
+ShearedMemory=NO;
+
+</dev></pre>    
+
+**BrokerName** to specify a domain name of the Broker, and **BrokerPortNo** is a port No of the Broker. **BrokerSecurePortNo** is for TLS connection.       
+**MulticastIP** and **MulticastPortNo** is a multicast address for GWSEARCH messages. Gateway is waiting GWSEARCH  and when receiving it send GWINFO message via MulticastIP address. Clients can get the gateway address (Gateway IP address and **GatewayPortNo**) from GWINFO message by means of std::recvfrom().
+Client should know the MulticastIP and MulticastPortNo to send a SEARCHGW message.    
+**GatewayId** is used by GWINFO message.    
+**KeepAlive** is a duration of ADVERTISE message in seconds.    
+when **AggregatingGateway** or **ClientAuthentication** is **YES**, All clients which connect to the gateway must be declared by a **ClientsList** file.       
+Format of the file is ClientId and SensorNetwork Address. e.g. IP address and Port No etc, in CSV. more detail see clients.conf.    
+When **QoS-1** is **YES**, QoS-1 PUBLISH is available. All clients which send QoS-1 PUBLISH must be specified by Client.conf file. 
+When **PredefinedTopic** is **YES**, **Pre-definedTopicId**s  specified by **PredefinedTopicList** are effective. This file defines Pre-definedTopics of the clients. In this file, ClientID,TopicName and TopicID are declared in CSV format.    
+When **Forwarder** is **YES**, Forwarder Encapsulation Message is available. Connectable Forwarders must be declared by a **ClientsList** file.     
+ 
+
+### ** How to monitor the gateway from remote. **
+
+Uncomment line32 in MQTTSNGWDefined.h.
+
+`//#define RINGBUFFER     // print out Packets log into shared memory./"`    
+````    
+$ make   
+$ make install 
+$ make clean
+````
+restart the gateway.    
+open ssh terminal and execute LogMonitor.
+
+`$ ./MQTT-SNLogmonitor`    
+
+Now you can get the Log on your terminal.
+
+