alphaWorks : Really Small Message Broker : Overview
Really Small Message Broker is a small server that uses MQ Telemetry Transport (MQTT) (Version 3) for lightweight, low-overhead messaging. Really Small Message Broker enables messaging to and from tiny devices such as sensors and actuators over networks that might have low bandwidth, high cost, and varying reliability. “Publishers” send messages to the broker, which then distributes the messages to the “subscribers” who have requested to receive those messages.