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.
$ git clone https://github.com/eclipse/paho.mqtt.c.git
$ cd paho.mqtt.c/
$ git reset --hard 7e9b814bfb81d1edc32d8cef3594d5265ffb2395
→ 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
$ vi src/samples/MQTTClient_publish.c +22
→ Here give the ip address of board as below and save the file.
#define ADDRESS     "tcp://192.168.1.39:1883"
→ Same for subscribe file too
$ vi src/samples/MQTTClient_subscribe.c +22
→ Here give the ip address of board as below
#define ADDRESS     "tcp://192.168.1.39:1883"
Step 4: Save and compile using below commands
$ make clean
$ make
Step 5: After compilation, copy the libraries from below path to usr/lib in the board
$ build/output/libpaho-mqtt3*
→ Copy the these two applications with name of "MQTTClient_subscribe", "MQTTClient_publish" from below path to "home/root" of the board.
$ build/output/samples/
Step 6: Edit the mosquitto configuration file as below in the board
$ vi /etc/mosquitto/mosquitto.conf
→ Add below lines in and save the file.
# Place your local configuration in /etc/mosquitto/conf.d/
#
# A full description of the configuration file is at
# /usr/share/doc/mosquitto/examples/mosquitto.conf.example
listener 1883 192.168.1.39
Note: here 1883 is port and 192.168.1.39 is board ip address.
Step 7: Run the below command in the board.
$ mosquitto -c /etc/mosquitto/mosquitto.conf &
→ ssh to the board ip address as "ssh [email protected]" from your PC.
→ And run the below binary to get the data
./MQTTClient_subscribe
→ Then run the below binary to sent the data in other terminal(do ssh to the board)
./MQTTClient_publish
Below are the test logs for above commands:
Output logs of ./MQTTClient_subscribe:
[email protected]:~# ./MQTTClient_subscribe
Subscribing to topic MQTT Examples
for client ExampleClientSub using QoS1
 
Press Q<Enter> to quit
 
Message arrived
     topic: MQTT Examples
   message: Hello World!
Output logs for ./MQTTClient_publish:
[email protected]:~# ./MQTTClient_publish 
Waiting for up to 10 seconds for publication of Hello World!
on topic MQTT Examples for client with ClientID: ExampleClientPub
Message with delivery token 1 delivered
[email protected]:~#
Output logs of mosquitto -c /etc/mosquitto/mosquitto.conf command:
[email protected]:~# mosquitto -c /etc/mosquitto/mosquitto.conf 
1325381603: mosquitto version 1.4.14 (build date 2020-11-04 14:08:01+0000) starting
1325381603: Config loaded from /etc/mosquitto/mosquitto.conf.
1325381603: Opening ipv4 listen socket on port 1883.
1325381610: New connection from 192.168.1.39 on port 1883.
1325381610: New client connected from 192.168.1.39 as ExampleClientPub (c1, k20).
1325381611: Client ExampleClientPub disconnected.
​

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