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MQTT
The IoT publish/subscribe workhorse: a broker decouples publishers and subscribers over topics, devices dial out (NAT-friendly), and QoS, retained messages, and Last Will handle lossy links.
24 min read
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Why is MQTT's publish/subscribe + broker model well-suited to IoT?Explain MQTT QoS levels and a subtlety people get wrong.What are retained messages and Last Will, and what problems do they solve?MQTT itself isn't encrypted. How do you secure it?What are the failure modes and design pitfalls when deploying MQTT?
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