Question 1

How do I enable automatic message acknowledgements in Ballerina MQTT?

Accepted Answer

Set 'manualAcks: false' in the ListenerConfiguration when initializing the subscriber, as shown in the code snippet. This tells the library to automatically send acknowledgements upon message receipt, simplifying the handler logic.

Question 2

Ballerina MQTT or Python Paho: which is better for IoT projects?

Accepted Answer

Ballerina MQTT is optimal if you're already using Ballerina for its type-safe, concurrent model. Python Paho offers broader ecosystem support and is language-agnostic, but Ballerina provides better integration within its own services. Choose based on your tech stack.

Question 3

How to handle errors in a Ballerina MQTT subscriber service?

Accepted Answer

Implement the 'onError' remote function in your 'mqtt:Service'. This function receives an 'mqtt:Error' object, allowing you to log or handle errors gracefully, as demonstrated in the example with 'log:printError'.

Question 4

Does Ballerina MQTT support MQTT 5.0?

Accepted Answer

The README does not specify the MQTT version; it likely supports MQTT 3.1.1 by default. For MQTT 5.0 features, you may need to check the library documentation or source code for explicit support.

Question 5

Can I subscribe to multiple topics with one Ballerina MQTT listener?

Accepted Answer

Yes, the subscriber can listen to one or more topics. In the initialization, provide the topic(s) as parameters. The example shows a single topic, but the documentation implies support for multiple, though specific syntax might need to be verified in the API docs.

Question 6

How to publish a message with Ballerina MQTT client?

Accepted Answer

Use the 'publish' API of the mqtt:Client, passing the topic and a message with a payload. For instance, 'check mqttClient->publish("topic", {payload: "message".toBytes()});' as shown in the README code snippet.

ballerina-mqtt

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