MQTT event publisher is used to send events to a MQTT broker based on the configurations you provide. You can configure it with XML, JSON, and text output mapping types.
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Follow the steps below before starting the output MQTT event adapter configuration.
- Download MQTT client library (
mqtt-client-0.4.0.jar). - Add the file to the
<PRODUCT_HOME>/repository/components/lib/directory.Configure WSO2 CEP by adding relevant jars to support MQTT transport.
- Start the MQTT-supported server.
Creating a MQTT event publisher
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Adapter Property | Description | Configuration file property | Example |
|---|---|---|---|
Client Id | Client identifier is used by the server to identify a client when it reconnects, It used for durable subscriptions or reliable delivery of messages is required | clientId | test-client |
Broker Url | MQTT broker URL. The same URL can be used f or WSO2 MB when offset=0 | url | tcp://localhost:1883 |
| Username | Username of the broker | username | mqtt-user |
| Password | Password of the broker | password | mqtt-password |
| Clean Session | Whether to persist topic subscriptions and acknowledge positions across client sessions | cleanSession | true/false |
| Quality of Service | Quality of service for delivering messages between clients and servers. There are three QoS levels in MQTT are as follows.
| qos | 0,1,2 |
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Adapter Property | Description | Configuration file property | Example |
|---|---|---|---|
Topic | The topic that will be used to send messages to MQTT broker. | topic | sensordata |