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+
+
+# MQTT Protocol
+
+[MQTT](http://mqtt.org/) is a machine-to-machine (M2M)/"Internet of Things" connectivity protocol.
+It was designed as an extremely lightweight publish/subscribe messaging transport.
+It is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium.
+
+IoTDB supports the MQTT v3.1(an OASIS Standard) protocol.
+IoTDB server includes a built-in MQTT service that allows remote devices send messages into IoTDB server directly.
+
+
+
+## Built-in MQTT Service
+The built-in MQTT service provides the ability to connect directly to the IoTDB via MQTT. It listens for publish messages from the MQTT client and immediately writes data to storage if the database already exists. Note: If the database does not exist, it will not be created, so it needs to be created in advance.
+
+The portion of the MQTT topic before / is defined as the name of the database into which the IoTDB is stored, or if / is not present, the topic is defined directly as the name of the database into which the IoTDB is stored.
+
+Message payloads can be formatted as events by the `PayloadFormatter` loaded by the Java SPI, and the default implementation of the table model is `LinePayloadFormatter`.
+
+The table model uses the row protocol by default, where attribute_key is an optional field. The following is the definition of the row protocol:
+```
+[,=[,=]][ =[,=]] =[,=] []
+```
+
+The following is an example of an MQTT message payload:
+```
+ myTable,tag1=t1,tag2=t2 attr1=a1,attr2=a2 fieldKey="fieldValue" 1740109006000
+ myTable,tag1=t1,tag2=t2 fieldKey="fieldValue" 1740109006001
+```
+
+
+
+
+## MQTT Configurations
+The IoTDB MQTT service load configurations from `${IOTDB_HOME}/${IOTDB_CONF}/iotdb-system.properties` by default.
+Writing to the IoTDB table model using MQTT requires configuring `mqtt_payload_formatter` to `line` in `${IOTDB_HOME}/${IOTDB_CONF}/iotdb-system.properties`.
+
+Example
+``` properties
+enable_mqtt_service=true
+mqtt_payload_formatter=line
+```
+
+Configurations are as follows:
+
+| NAME | DESCRIPTION | DEFAULT |
+| ------------- |:-----------------------------------------------------------------------------------------------------------------------------------------------:|:---------:|
+| enable_mqtt_service | whether to enable the mqtt service | false |
+| mqtt_host | the mqtt service binding host | 127.0.0.1 |
+| mqtt_port | the mqtt service binding port | 1883 |
+| mqtt_handler_pool_size | the handler pool size for handing the mqtt messages | 1 |
+| mqtt_payload_formatter | the mqtt message payload formatter; Options: [json, line],The built-in json only supports tree models, and the line only supports table models. | json |
+| mqtt_max_message_size | the max mqtt message size in byte | 1048576 |
+
+
+## Coding Examples
+The following is an example which a mqtt client send messages to IoTDB server.
+
+ ```java
+MQTT mqtt = new MQTT();
+mqtt.setHost("127.0.0.1", 1883);
+mqtt.setUserName("root");
+mqtt.setPassword("root");
+
+BlockingConnection connection = mqtt.blockingConnection();
+connection.connect();
+
+String payload =
+ "test1,tag1=t1,tag2=t2 attr3=a5,attr4=a4 field1=\"fieldValue1\",field2=1i,field3=1u 1";
+ connection.publish(DATABASE + "/myTopic", payload.getBytes(), QoS.AT_LEAST_ONCE, false);
+ Thread.sleep(10);
+
+payload =
+ "test1,tag1=t1,tag2=t2 attr1=a1,attr2=a2 field1=\"fieldValue1\",field2=1i,field3=1u 4 \n "
+ + "test1,tag1=t1,tag2=t2 field4=2,field5=2i32,field6=2f 5";
+ connection.publish(DATABASE, payload.getBytes(), QoS.AT_LEAST_ONCE, false);
+ Thread.sleep(10);
+
+connection.disconnect();
+ ```
+
+
+## Customize your MQTT Message Format
+
+If you do not like the above Json format, you can customize your MQTT Message format by just writing several lines
+of codes.
+
+Steps:
+1. Create a java project, and add dependency:
+```xml
+
+ org.apache.iotdb
+ iotdb-server
+ 2.0.0
+
+```
+2. Define your implementation which implements `org.apache.iotdb.db.protocol.mqtt.PayloadFormatter`
+ e.g.,
+```java
+
+import org.apache.iotdb.db.protocol.mqtt.Message;
+import org.apache.iotdb.db.protocol.mqtt.PayloadFormatter;
+import org.apache.iotdb.db.protocol.mqtt.TableMessage;
+
+import io.netty.buffer.ByteBuf;
+import org.apache.tsfile.enums.TSDataType;
+import org.apache.tsfile.utils.Binary;
+
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class CustomizedTablePayloadFormatter implements PayloadFormatter {
+
+ @Override
+ public List format(ByteBuf payload) {
+ if (payload == null) {
+ return Collections.emptyList();
+ }
+
+ List ret = new ArrayList<>();
+
+ for (int i = 0; i < 2; i++) {
+ long ts = i;
+ TableMessage message = new TableMessage();
+ message.setTable("tableTest");
+ List tagKeys = new ArrayList<>();
+ List
+
+## Built-in MQTT Service
+The built-in MQTT service provides the ability to connect directly to the IoTDB via MQTT. It listens for publish messages from the MQTT client and immediately writes data to storage if the database already exists. Note: If the database does not exist, it will not be created, so it needs to be created in advance.
+
+The portion of the MQTT topic before / is defined as the name of the database into which the IoTDB is stored, or if / is not present, the topic is defined directly as the name of the database into which the IoTDB is stored.
+
+Message payloads can be formatted as events by the `PayloadFormatter` loaded by the Java SPI, and the default implementation of the table model is `LinePayloadFormatter`.
+
+The table model uses the row protocol by default, where attribute_key is an optional field. The following is the definition of the row protocol:
+```
+
+
+## MQTT Configurations
+The IoTDB MQTT service load configurations from `${IOTDB_HOME}/${IOTDB_CONF}/iotdb-system.properties` by default.
+Writing to the IoTDB table model using MQTT requires configuring `mqtt_payload_formatter` to `line` in `${IOTDB_HOME}/${IOTDB_CONF}/iotdb-system.properties`.
+
+Example
+``` properties
+enable_mqtt_service=true
+mqtt_payload_formatter=line
+```
+
+Configurations are as follows:
+
+| NAME | DESCRIPTION | DEFAULT |
+| ------------- |:-----------------------------------------------------------------------------------------------------------------------------------------------:|:---------:|
+| enable_mqtt_service | whether to enable the mqtt service | false |
+| mqtt_host | the mqtt service binding host | 127.0.0.1 |
+| mqtt_port | the mqtt service binding port | 1883 |
+| mqtt_handler_pool_size | the handler pool size for handing the mqtt messages | 1 |
+| mqtt_payload_formatter | the mqtt message payload formatter; Options: [json, line],The built-in json only supports tree models, and the line only supports table models. | json |
+| mqtt_max_message_size | the max mqtt message size in byte | 1048576 |
+
+
+## Coding Examples
+The following is an example which a mqtt client send messages to IoTDB server.
+
+ ```java
+MQTT mqtt = new MQTT();
+mqtt.setHost("127.0.0.1", 1883);
+mqtt.setUserName("root");
+mqtt.setPassword("root");
+
+BlockingConnection connection = mqtt.blockingConnection();
+connection.connect();
+
+String payload =
+ "test1,tag1=t1,tag2=t2 attr3=a5,attr4=a4 field1=\"fieldValue1\",field2=1i,field3=1u 1";
+ connection.publish(DATABASE + "/myTopic", payload.getBytes(), QoS.AT_LEAST_ONCE, false);
+ Thread.sleep(10);
+
+payload =
+ "test1,tag1=t1,tag2=t2 attr1=a1,attr2=a2 field1=\"fieldValue1\",field2=1i,field3=1u 4 \n "
+ + "test1,tag1=t1,tag2=t2 field4=2,field5=2i32,field6=2f 5";
+ connection.publish(DATABASE, payload.getBytes(), QoS.AT_LEAST_ONCE, false);
+ Thread.sleep(10);
+
+connection.disconnect();
+ ```
+
+
+## Customize your MQTT Message Format
+
+If you do not like the above Json format, you can customize your MQTT Message format by just writing several lines
+of codes.
+
+Steps:
+1. Create a java project, and add dependency:
+```xml
+