MQTT Client on RB

 Objective:
This guide describes the testing method of mqtt client for the Rugged Board A5d2x.
Materials:
Hardware:
Rugged Board A5d2x
ubuntu pc
Software:
Not Require
Procedure:
Step 1: Add the below additional packages in yocto and use compiled rootfs.
mosquitto
tcpdump
​How to add new package in yocto.​
Step 2: Download the source from below link and cross compile it.
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$ git clone https://github.com/eclipse/paho.mqtt.c.git
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$ cd paho.mqtt.c/
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$ git reset --hard 7e9b814bfb81d1edc32d8cef3594d5265ffb2395
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→ Run the toolchain of rugged board a5d2x to cross compile the application source.
Step 3: Edit the publish and subscribe files of mqtt applications as below
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$ vi src/samples/MQTTClient_publish.c +22
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→ Here give the ip address of board as below and save the file.
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#define ADDRESS     "tcp://192.168.1.39:1883"
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→ Same for subscribe file too
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$ vi src/samples/MQTTClient_subscribe.c +22
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→ Here give the ip address of board as below
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#define ADDRESS     "tcp://192.168.1.39:1883"
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Step 4: Save and compile using below commands
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$ make clean
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$ make
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Step 5: After compilation, copy the libraries from below path to usr/lib in the board
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$ build/output/libpaho-mqtt3*
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→ Copy the these two applications with name of "MQTTClient_subscribe", "MQTTClient_publish" from below path to "home/root" of the board.
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$ build/output/samples/
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Step 6: Edit the mosquitto configuration file as below in the board
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$ vi /etc/mosquitto/mosquitto.conf
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→ Add below lines in and save the file.
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# Place your local configuration in /etc/mosquitto/conf.d/
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#
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# A full description of the configuration file is at
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# /usr/share/doc/mosquitto/examples/mosquitto.conf.example
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listener 1883 192.168.1.39
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Note: here 1883 is port and 192.168.1.39 is board ip address.
Step 7: Run the below command in the board.
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$ mosquitto -c /etc/mosquitto/mosquitto.conf &
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→ ssh to the board ip address as "ssh [email protected]" from your PC.
→ And run the below binary to get the data
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./MQTTClient_subscribe
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→ Then run the below binary to sent the data in other terminal(do ssh to the board)
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./MQTTClient_publish
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Below are the test logs for above commands:
Output logs of ./MQTTClient_subscribe:
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[email protected]:~# ./MQTTClient_subscribe
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Subscribing to topic MQTT Examples
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for client ExampleClientSub using QoS1
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Press Q<Enter> to quit
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Message arrived
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     topic: MQTT Examples
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   message: Hello World!
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Output logs for ./MQTTClient_publish:
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[email protected]:~# ./MQTTClient_publish 
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Waiting for up to 10 seconds for publication of Hello World!
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on topic MQTT Examples for client with ClientID: ExampleClientPub
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Message with delivery token 1 delivered
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[email protected]:~#
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Output logs of mosquitto -c /etc/mosquitto/mosquitto.conf command:
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[email protected]:~# mosquitto -c /etc/mosquitto/mosquitto.conf 
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1325381603: mosquitto version 1.4.14 (build date 2020-11-04 14:08:01+0000) starting
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1325381603: Config loaded from /etc/mosquitto/mosquitto.conf.
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1325381603: Opening ipv4 listen socket on port 1883.
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1325381610: New connection from 192.168.1.39 on port 1883.
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1325381610: New client connected from 192.168.1.39 as ExampleClientPub (c1, k20).
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1325381611: Client ExampleClientPub disconnected.
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