Just a basic Grails Application to test both RabbitMQ (http://www.rabbitmq.com/) and also MQTT interoperation with grails.
This Project depends on the MQTT client implementation of paho. Please place the specific jar file into the lib folder. Please see also the PAHO quick start guide: http://mobilave.info/blog/2012/Quick_start_guide_for_the_Paho_MQTT_Java_Client.html and additional information online (http://www.eclipse.org/paho/)