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MQTT 101 – How to Get Started with the lightweight IoT Protocol

Everybody talks about the Internet of Things nowadays. Increasingly affordable micro controllers like Arduino and Raspberry Pi are enabling cheap devices that measure sensor data and send it over the internet. The goal of this post is to introduce the lightweight protocol MQTT and its capabilities to send data between devices and other systems and to demonstrate them by implementing two clients with Eclipse Paho.

The term Internet of Things was first used by Kevin Ashton in 2009 for interconnecting physical devices over the internet. The basic idea is very simple: Physical devices can exchange data between each other or being controlled by others. Examples of such devices would be a refrigerator, a car, a building or basically any other electronic device. One of the most common use cases is the collection, transmission, consolidation and displaying of sensor data. The results could be a web dashboard with the aggregated values or an alarm, when a threshold is exceeded.

The application s…