Add support for MQTT

[sensiasoft]

Issue by sensiasoft
Saturday Jan 10, 2015 at 17:41 GMT
Originally opened as https://github.com/sensiasoft/sensorhub-core/issues/6

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MQTT is a bandwidth efficient IoT standard for sending/subscribing to notifications in a M2M environment. SensorHub could leverage this standard by wrapping SWE Common data into MQTT as a way to more efficiently (in comparison to WS-Notification) dispatch events and push data to consumers.

References:
OASIS standard: https://www.oasis-open.org/committees/mqtt/
Java library: https://eclipse.org/paho/clients/java/