[jira] [Created] (IOTDB-657) Update MQTT example document

[Xin Wang (Jira)]

Xin Wang created IOTDB-657:
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             Summary: Update MQTT example document
                 Key: IOTDB-657
                 URL: https://issues.apache.org/jira/browse/IOTDB-657
             Project: Apache IoTDB
          Issue Type: Improvement
            Reporter: Xin Wang
            Assignee: Xin Wang


It's necessary to update the MQTT document since the built-in MQTT service has 
been disabled by default.



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