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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/)

Building the configuration

For consumer ESB 

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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 directory.axis2-transport-mqtt-1.0.0.
  jar
  • 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 

Use Run the following command to use the mosquito publisher you can start by typing the following in the console.:

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  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

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On the console you will see the following:

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