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Table of Contents

Introduction

This sample demonstrates how the MQTT Connector connector publishes the a message on a particular topic and how the a MQTT client which that is subscribes subscribed to that topic receives it.

Prerequisites

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Download and install the following before starting MQTT sample configurations.

- mqtt-client-0.4.0.jar
mqtt-connector-1.0.0.zip
mosquitto-1.3.4 (http://mosquitto.org/)

Building the Configuration

For Consumer ESB

Download wso2esb-4.9.0-BETA-SNAPSHOT and do the following configuration changes.

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- Start the MQTT-supported server. (E.g. Mosquitto)

Building the sample

For consumer ESB

Copy the following client libraries to the < ESB_HOME>/repository/components/lib

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axis2-transport-mqtt-1.0.0.jardirectory.
- mqtt-client-0.4.0.jar

Add the XML configuration for the inbound endpoint as follows:

Code Block

language	xml
title	Insequence

<inboundEndpoint xmlns="http://ws.apache.org/ns/synapse" name="test" sequence="TestIn" onError="TestIn" protocol="mqtt" suspend="false">
   <parameters>
      <parameter name="sequential">true</parameter>
      <parameter name="mqtt.connection.factory">mqttFactory</parameter>
      <parameter name="mqtt.server.host.name">localhost</parameter>
      <parameter name="mqtt.server.port">1883</parameter>
      <parameter name="mqtt.topic.name">esb.test2</parameter>
      <parameter name="mqtt.subscription.qos">2</parameter>
      <parameter name="content.type">application/xml</parameter>
      <parameter name="mqtt.session.clean">false</parameter>
      <parameter name="mqtt.ssl.enable">false</parameter>
      <parameter name="mqtt.subscription.username">elil1</parameter>
      <parameter name="mqtt.subscription.password">e13</parameter>
      <parameter name="mqtt.temporary.store.directory">my</parameter>
      <parameter name="mqtt.blocking.sender">false</parameter>
   </parameters>
</inboundEndpoint>

Code Block

language	xml
title	TestIn

<sequence xmlns="http://ws.apache.org/ns/synapse" name="TestIn">
   <log level="full"/>
   <drop/>
</sequence>

For

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publisher ESB

Download wso2esb-4.9.0-BETA-SNAPSHOT and do the following configuration changes.

Upload the mqtt-connector-1.0.0.zip to esb.

Add the following proxy and local entries.

Code Block

language	xml
title	Proxy

<proxy xmlns="http://ws.apache.org/ns/synapse" name="mqttXML" transports="https http" startOnLoad="true" trace="disable">
   <description/>
   <target>
      <inSequence>
         <property name="msg" expression="//msg"/>
         <mqtt.publish configKey="xxx">
            <topic>esb.test2</topic>
            <qos>2</qos>
            <msg>{$ctx:msg}</msg>
            <retained>true</retained>
            <disconnectAfter>false</disconnectAfter>
         </mqtt.publish>
         <respond/>
      </inSequence>
      <outSequence/>
      <faultSequence/>
   </target>
</proxy>

Code Block

language	xml
title	Local Entry

<localEntry xmlns="http://ws.apache.org/ns/synapse" key="xxx">
   <mqtt.init>
      <hostName>localhost</hostName>
      <port>1883</port>
      <sslEnable>false</sslEnable>
      <asyncClientEnable>true</asyncClientEnable>
      <username>admin</username>
      <password>0777</password>
      <lwMessage>lwMSG</lwMessage>
   </mqtt.init>
   <description/>
</localEntry>

If you want to use the mosquito publisher you can start simply by typing the following in the console.

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Run the following command to use the mosquito publisher:

Code Block
mosquitto_pub -h 127.0.0.1 -t esb.test2 -m "<msg><a>Testing123</a></msg>"

Executing the

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request

Now once you are done with the configurations start the consumer and publisher ESBs. Start the mosquitto subscriber using After you perform the required configuration changes,

Start the ESB and the mosquito publisher.
Start the mosquitto subscriber by executing the following command:
Code Block
mosquitto_sub -h 127.0.0.1 -t esb.test2

Then give the following request to the proxy endpoint.

Proxy Image Removed