Question 1

How do I build a custom MQTT broker with Vert.x MQTT?

Accepted Answer

Start by using the server component to handle connections and events; you'll need to implement business logic for message routing, persistence, and security on top of the raw protocol events. Examples are available in the vertx-examples repository for guidance.

Question 2

What's the difference between Vert.x MQTT and Mosquitto?

Accepted Answer

Vert.x MQTT is a library for embedding MQTT capabilities in Java applications, while Mosquitto is a standalone, fully featured MQTT broker. Choose Vert.x MQTT for custom integrations in Vert.x apps, and Mosquitto for out-of-the-box broker functionality.

Question 3

How to handle QoS 2 messages in Vert.x MQTT client?

Accepted Answer

Use the publish method with the appropriate QoS level; the client handles the protocol flow, but you must manage acknowledgments and retries in your application logic as per MQTT 3.1.1 spec. Refer to the in-source docs for code examples.

Question 4

Is Vert.x MQTT suitable for IoT edge devices?

Accepted Answer

Yes, due to its lightweight nature and reactive performance, it can run on resource-constrained environments, but you'll need to bundle it with a JVM and Vert.x runtime, which may add overhead compared to native C libraries.

Question 5

Can Vert.x MQTT be used with MQTT 5.0?

Accepted Answer

No, it only supports MQTT 3.1.1 as stated in the README; for MQTT 5.0, you'd need to look for alternative libraries or wait for future updates to the project.

Question 6

How to scale Vert.x MQTT server for high concurrency?

Accepted Answer

Leverage Vert.x's event loop and worker verticles for non-blocking I/O; you can deploy multiple instances and use a load balancer, but clustering and state management must be implemented manually since it's not built-in.

Vert.x MQTT Server

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