Red Hat Summit Red Hat Summitサポートコンソール開発者トライアルの開始お問い合わせ

このコンテンツは選択した言語では利用できません。

Chapter 80. MQTT

MQTT Component
リンクのコピー

Available as of Camel 2.10
The mqtt: component is used for communicating with MQTT compliant message brokers, like Apache ActiveMQ or Mosquitto
Camel will poll the feed every 60 seconds by default. Note: The component currently only supports polling (consuming) feeds.
Maven users will need to add the following dependency to their pom.xml for this component: 
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-mqtt</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
Copy to Clipboard Toggle word wrap

URI format
リンクのコピー

mqtt://name[?options]
Copy to Clipboard Toggle word wrap
Where name is the name you want to assign the component.

Options
リンクのコピー

Expand
Property Default Description
host tcp://127.0.0.1:1883 The URI of the MQTT broker to connect too - this component also supports SSL - e.g. ssl://127.0.0.1:8883
localAddress The local InetAddress and port to use
connectAttemptsMax -1 The maximum number of attempts to establish an initial connection - -1 in infinite.
reconnectAttemptsMax -1 The maximum number of attempts to re-establish a connection after failure - -1 in infinite.
reconnectDelay 10 The time in milliseconds between attempts to reestablish an initial or failed connection
reconnectBackOffMultiplier 2.0 The multiplier to use to the delay between connection attempts for successive failed connection attempts
reconnectDelayMax 30000 The maximum time in milliseconds between a new attempt to establish a connection. So even using the reconnectBackOffMultiplier, this property will define the maximum delay before another connection attempt to the MQTT broker
QoS AtLeastOnce The MQTT Quality of Service to use for message exchanges. It can be one of AtMostOnce, AtLeastOnce or ExactlyOnce
subscribeTopicName The name of the Topic to subscribe to for messages
publishTopicName camel/mqtt/test The default Topic to publish messages on
byDefaultRetain false The default retain policy to be used on messages sent to the MQTT broker
mqttTopicPropertyName _MQTTTopicPropertyName+ The property name to look for on an Exchange for an individual published message. If this is set - the name will be used as the Topic to publish a message to the MQTT message broker.
mqttRetainPropertyName MQTTRetain The property name to look for on an Exchange for an individual published message. If this is set (expects a Boolean value) - then the retain property will be set on the message sent to the MQTT message broker.
mqttQosPropertyName MQTTQos The property name to look for on an Exchange for an individual published message. If this is set (one of AtMostOnce, AtLeastOnce or ExactlyOnce ) - then that QoS will be set on the message sent to the MQTT message broker.
connectWaitInSeconds 10 Delay in seconds the Component will wait for a connection to be established to the MQTT broker
disconnectWaitInSeconds 5 the number of seconds the Component will wait for a valid disconnect on stop() from the MQTT broker
sendWaitInSeconds 5 The maximum time the Component will wait for a receipt from the MQTT broker to acknowledge a published message before throwing an exception
You can append query options to the URI in the following format, ?option=value&option=value&...

Samples
リンクのコピー

Sending messages: 
from("direct:foo").to("mqtt:cheese?publishTopicName=test.mqtt.topic");
Copy to Clipboard Toggle word wrap
Consuming messages: 
from("mqtt:bar?subscribeTopicName=test.mqtt.topic").transform(body().convertToString()).to("mock:result")
Copy to Clipboard Toggle word wrap
トップに戻る
Red Hat logoGithubredditYoutubeTwitter

詳細情報

試用、購入および販売

コミュニティー

Red Hat ドキュメントについて

Red Hat をお使いのお客様が、信頼できるコンテンツが含まれている製品やサービスを活用することで、イノベーションを行い、目標を達成できるようにします。 最新の更新を見る.

多様性を受け入れるオープンソースの強化

Red Hat では、コード、ドキュメント、Web プロパティーにおける配慮に欠ける用語の置き換えに取り組んでいます。このような変更は、段階的に実施される予定です。詳細情報: Red Hat ブログ.

会社概要

Red Hat は、企業がコアとなるデータセンターからネットワークエッジに至るまで、各種プラットフォームや環境全体で作業を簡素化できるように、強化されたソリューションを提供しています。

Theme

© 2025 Red Hat