The Internet of Things (IoT) has recently gained massive traction. IoT challenges enterprises, small companies, and developers with new problems to solve. While HTTP is the de facto protocol for the human web, communication between machines at scale requires a paradigm shift — steering away from request/response and leading toward publish/subscribe. This is where the ultra-lightweight, massively scalable, open, and easy-to-implement MQTT protocol enters the picture.

In this Refcard, we dive into what MQTT is and how it works, including brokers, client libraries, and more.

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