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MQTT clients are very small, require minimal resources so can be used on small microcontrollers. MQTT message headers are small to optimize network bandwidth.
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MQTT allows for messaging between device to cloud and cloud to device. This makes for easy broadcasting messages to groups of things.
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MQTT can scale to connect with millions of IoT devices.
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Reliability of message delivery is important for many IoT use cases. This is why MQTT has 3 defined quality of service levels: 0 - at most once, 1- at least once, 2 - exactly once
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MQTT makes it easy to encrypt messages using TLS and authenticate clients using modern authentication protocols, such as OAuth.
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MQTT is used in a wide variety of industries