Sample 906: Inbound Endpoint MQTT Protocol Sample

Introduction

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

Download and install the following before starting MQTT sample configurations.

• • mqtt-client-0.4.0.jar
  • 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.
  • mqtt-client-0.4.0.jar
    
    

• Add the XML configuration for the inbound endpoint as follows:

  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>

  TestIn

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

For publisher ESB 

Run the following command to use the mosquito publisher:

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 ESB and the mosquito publisher.

• Start the mosquitto subscriber by executing the following command:

  mosquitto_sub -h 127.0.0.1 -t esb.test2

Analyzing the output

On the console you will see the following: