Also the Internet of Things portal from Eclipse mighht be interesting. It shows other brokers and client libraries http://iot.eclipse.org/ http://iot.eclipse.or

Also the Internet of Things portal from Eclipse mighht be interesting. It shows other brokers and client libraries http://iot.eclipse.org/ http://iot.eclipse.org/ I think I might go with mosquitto and see how many simultaneuous connections are possibke on ine machine. Otherwise RabbitMQ with MQTT support might be an option. mosquitto ajd RabbitMQ can cluster brokers, which you might need to scale out.