private boolean setTimestamp(Matcher matcher, TableMessage message) {
    String timestampGroup = matcher.group(TIMESTAMP);
    if (timestampGroup != null && !timestampGroup.isEmpty()) {
      message.setTimestamp(Long.parseLong(timestampGroup));
      return true;
    } else {
      return false;
    }
  }
The Line payload formatter. myTable,tag1=value1,tag2=value2 attr1=value1,attr2=value2
fieldKey="fieldValue" 1740109006000 \n myTable,tag1=value1,tag2=value2 fieldKey="fieldValue"
1740109006000
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/protocol/mqtt/LinePayloadFormatter.java