Appendix (MQTT)

• http://spin.atomicobject.com/2014/03/19/mqtt-protocol-ethernet/
• http://blog.bwhouse.net/mqtt-topic-structures/
• http://nicegear.co.nz/blog/home-automation-with-arduino-mqtt/
• http://oliversmith.io/technology/2010/03/11/mqtt-and-ammeters/
• http://forum.arduino.cc/index.php?topic=290665.0
• http://chrislarson.me/blog/using-mqtt-connect-arduino-internet-things.html