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This sample demonstrates how the MQTT connector publishes a message on a particular topic and how a MQTT client that is 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/)

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

Building the sample

For consumer ESB

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

Copy the following client libraries to the < ESB_HOME>/repository/components/lib directory.axis2-transport-mqtt-1.0.
- 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 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 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 request

After you perform the required configuration changes,

Start the consumer ESB and publisher ESBsthe mosquito publisher.
Start the mosquitto subscriber by executing the following command:
Code Block
mosquitto_sub -h 127.0.0.1 -t esb.test2
Send the following request to the proxy endpoint:
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