| Name | Description | Type | Package | Framework |
| MqttConnAckMessage | See MQTTV3. | Class | io.netty.handler.codec.mqtt | Netty |
| MqttConnAckVariableHeader | Class | io.netty.handler.codec.mqtt | Netty | |
| MqttConnectMessage | See MQTTV3. | Class | io.netty.handler.codec.mqtt | Netty |
| MqttConnectPayload | Class | io.netty.handler.codec.mqtt | Netty | |
| MqttConnectReturnCode | enum MqttConnectReturnCodeReturn Code of MqttConnAckMessage | Class | io.netty.handler.codec.mqtt | Netty |
| MqttConnectVariableHeader | Class | io.netty.handler.codec.mqtt | Netty | |
| MqttDecoder | Decodes Mqtt messages from bytes, followingthe MQTT protocl specification v3. | Class | io.netty.handler.codec.mqtt | Netty |
| MqttEncoder | Encodes Mqtt messages into bytes following the protocl specification v3. | Class | io.netty.handler.codec.mqtt | Netty |
| MqttFixedHeader | MQTTV3. | Class | io.netty.handler.codec.mqtt | Netty |
| MqttIdentifierRejectedException | A MqttIdentifierRejectedException which is thrown when a CONNECT request contains invalid client identifier. | Class | io.netty.handler.codec.mqtt | Netty |
| MqttMessage | Base class for all MQTT message types. | Class | io.netty.handler.codec.mqtt | Netty |
| MqttMessageFactory | Utility class with factory methods to create different types of MQTT messages. | Class | io.netty.handler.codec.mqtt | Netty |
| MqttMessageIdVariableHeader | Class | io.netty.handler.codec.mqtt | Netty | |
| MqttMessageType | enum MqttMessageTypeEnum Constant Summary | Class | io.netty.handler.codec.mqtt | Netty |
| MqttPubAckMessage | Class | io.netty.handler.codec.mqtt | Netty | |
| MqttPublishMessage | See MQTTV3. | Class | io.netty.handler.codec.mqtt | Netty |
| MqttPublishVariableHeader | Class | io.netty.handler.codec.mqtt | Netty | |
| MqttQoS | Class | io.netty.handler.codec.mqtt | Netty | |
| MqttSubAckMessage | Class | io.netty.handler.codec.mqtt | Netty | |
| MqttSubAckPayload | Class | io.netty.handler.codec.mqtt | Netty | |
| MqttSubscribeMessage | Class | io.netty.handler.codec.mqtt | Netty | |
| MqttSubscribePayload | Class | io.netty.handler.codec.mqtt | Netty | |
| MqttTopicSubscription | Contains a topic name and Qos Level. | Class | io.netty.handler.codec.mqtt | Netty |
| MqttUnacceptableProtocolVersionException | A MqttUnacceptableProtocolVersionException which is thrown whena CONNECT request contains unacceptable protocol version. | Class | io.netty.handler.codec.mqtt | Netty |
| MqttUnsubAckMessage | See MQTTV3. | Class | io.netty.handler.codec.mqtt | Netty |
| MqttUnsubscribeMessage | MQTTV3. | Class | io.netty.handler.codec.mqtt | Netty |
| MqttUnsubscribePayload | Class | io.netty.handler.codec.mqtt | Netty | |
| MqttVersion | Mqtt version specific constant values used by multiple classes in mqtt-codec. | Class | io.netty.handler.codec.mqtt | Netty |