Use RabbitMQ RPC to use request-reply pattern in your Micronaut applications.
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.

Oracle Cloud Oracle Cloud

Amazon Web Services Amazon Web Services

Learn how to connect JMS Application to an AWS SQS Queue