@Override
  public String getName() {
    return "json";
  }
The JSON payload formatter. two json format supported: { "device":"root.sg.d1",
"timestamp":1586076045524, "measurements":["s1","s2"], "values":[0.530635,0.530635] }

<p>{ "device":"root.sg.d1", "timestamps":[1586076045524,1586076065526],
"measurements":["s1","s2"], "values":[[0.530635,0.530635], [0.530655,0.530695]] }
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/protocol/mqtt/JSONPayloadFormatter.java