MqttPahoMessageDrivenChannelAdapter
时间: 2023-11-24 11:07:12 浏览: 25
MqttPahoMessageDrivenChannelAdapter is a message-driven channel adapter in Spring Integration that allows receiving messages from an MQTT broker using the Eclipse Paho MQTT client library. It provides a convenient way to subscribe to one or more MQTT topics and receive messages as they are published to those topics.
To use the MqttPahoMessageDrivenChannelAdapter, you need to configure the adapter with the following properties:
- clientId: The client ID to use when connecting to the MQTT broker.
- url: The URL of the MQTT broker to connect to.
- topics: A list of MQTT topics to subscribe to.
- qos: The quality of service level to use when subscribing to the topics.
- connectionFactory: An instance of MqttPahoClientFactory to use for connecting to the MQTT broker.
Once the adapter is configured, you can start it by calling its start() method. This will create a connection to the MQTT broker and start receiving messages on the subscribed topics. The received messages will be sent to a Spring Integration message channel, which can be further processed by other components in your application.
Example usage:
```
<bean id="mqttClientFactory" class="org.springframework.integration.mqtt.core.DefaultMqttPahoClientFactory">
<property name="clientId" value="myClientId" />
<property name="serverURI" value="tcp://localhost:1883" />
</bean>
<int-mqtt:message-driven-channel-adapter id="mqttInbound"
client-id="myClientId"
url="tcp://localhost:1883"
topics="myTopic"
qos="1"
channel="mqttInputChannel"
connection-factory="mqttClientFactory" />
<int:channel id="mqttInputChannel" />
<int:service-activator input-channel="mqttInputChannel"
ref="myMessageHandler"
method="handleMessage" />
```
In this example, the MqttPahoMessageDrivenChannelAdapter is configured to subscribe to the "myTopic" topic with QoS level 1. The received messages will be sent to the "mqttInputChannel" message channel, which is then processed by a message handler bean called "myMessageHandler".