public void setCorrelationData(String correlationData) {
        this.correlationData = correlationData;
    }
<p>
The base64-encoded binary data used by the sender of the request message to identify which request the response
message is for when it's received.
</p>
<p>
For more information, see <a href="https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901115">
Correlation Data</a> from the MQTT Version 5.0 specification.
</p>
<note>
<p>
This binary data must be based64-encoded.
</p>
</note>
<p>
Supports <a
href="https://docs.aws.amazon.com/iot/latest/developerguide/iot-substitution-templates.html">substitution
templates</a>.
</p>

@param correlationData
       The base64-encoded binary data used by the sender of the request message to identify which request the
       response message is for when it's received.</p>
       <p>
       For more information, see <a
       href="https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901115"> Correlation Data</a>
       from the MQTT Version 5.0 specification.
       </p>
       <note>
       <p>
       This binary data must be based64-encoded.
       </p>
       </note>
       <p>
       Supports <a href="https://docs.aws.amazon.com/iot/latest/developerguide/iot-substitution-templates.html">
       substitution templates</a>.
aws-java-sdk-iot/src/main/java/com/amazonaws/services/iot/model/MqttHeaders.java