This documentation is for WSO2 IoT Server 3.1.0. View the documentation for the latest release.
Page Comparison - Configuring WSO2 IoT Server with a Third Party MQTT Broker (v.16 vs v.17) - IoT Server 3.1.0 - WSO2 Documentation

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The broker profile enables devices to communicate with the WSO2 IoT Server device management profile in a secure fashion. MQTT implementation by default uses basic auth to authenticate a client and it requires hard coding Device Owner credentials to the device. This is not a safe device authentication mechanism. Therefore, WSO2 IoT Server recommends OAuth for device authentication and authorization. 

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