MQTT vs HTTP for IoT: Key Trade-offs from Real Production Deployments

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A developer who deployed both MQTT and HTTP protocols across production IoT systems — including warehouse sensors, robot units, and building-management backends — has detailed the practical trade-offs between the two approaches. HTTP follows a request-response model where clients initiate communication, while MQTT uses persistent connections and a publish-subscribe architecture routed through a broker. In bandwidth terms, MQTT packets have a more compact application-layer framing, giving it an edge for high-frequency messaging across large device fleets, though HTTP persistent connections and HTTP/2 multiplexing narrow that gap for less frequent updates. The most significant real-world difference was server-to-device communication: HTTP requires devices to poll for commands, whereas MQTT enables the server to push updates instantly to subscribed devices. The author concludes that neither protocol is universally superior — the right choice depends on the device's communication model, power constraints, infrastructure, and how commands need to be delivered.

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