This site contains the documentation that is relevant to older WSO2 product versions and offerings.
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Configuring WSO2 ESB for UDP Transport

To enable the UDP transport for samples, simple open the file repository/conf/axis2/axis2.xml in a text editor and add the following transport configurations. UDP transport component is shipped with WSO2 ESB by default.

<transportReceiver name="udp"/>
 <transportSender name="udp"/>

If you wish to use the sample Axis2 client to send UDP messages, you have to uncomment the UDP transport sender configuration in the samples/axis2Client/client_repo/conf/axis2.xml file.