MQTT-SN requires a MQTT-SN Gateway which acts as a protocol converter to convert MQTT-SN messages to MQTT messages. MQTT-SN client (UDP) can not communicate directly with MQTT broker(TCP/IP).
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:
# config file of MQTT-SN Gateway # BrokerName=iot.eclipse.org BrokerPortNo=1883 BrokerSecurePortNo=8883 # # When AggregateGateway=YES or ClientAuthentication=YES, # All clients must be specified by the ClientList File # ClientAuthentication=NO AggregateGateway=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=188.8.131.52 MulticastPortNo=1883 # XBee Baudrate=38400 SerialDevice=/dev/ttyUSB0 ApiMode=2 # LOG ShearedMemory=NO;
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 AggregateGateway 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-definedTopicIds 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.
Now you can get the Log on your terminal.