These tutorials target Micronaut Framework 3. Read, Guides for Micronaut Framework 4.

messaging

Learn how to connect JMS Application to an AWS SQS Queue
Tags: jms, messaging, aws
Use Kafka to communicate between your Micronaut applications.
Learn how to use Mosquitto as an MQTT broker, create a Micronaut CLI application and publish an MQTT topic, and subscribe to the MQTT topic in a different Micronaut Messaging application.
Tags: messaging
Use Oracle Cloud Streaming to communicate between your Micronaut applications.
Use RabbitMQ to communicate between your Micronaut applications.
Use RabbitMQ RPC to use request-reply pattern in your Micronaut applications.