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 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 param.conf are copied into ../ 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
ClientAuthentication=NO
#ClientsList=/path/to/your_clients.conf
#RootCAfile=/path/to/your_Root_CA.crt
#RootCApath=/path/to/your_certs_directory/
#CertKey=/path/to/your_cert.pem
#PrivateKey=/path/to/your_private-key.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
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 ClientAuthentication is YES, see MQTTSNGWClient.cpp line53, clients file specified by ClientsList is required. This file defines connect allowed clients by ClientId and SensorNetwork Address. e.g. IP address and Port No.
** 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.