HTTP vs MQTT for IoT: Choosing the Right Communication Model

HTTP (the protocol behind ordinary web browsing) can also be used by IoT devices to send data — it's universally understood and simple to implement, but each request carries a fair amount of overhead, and it's not naturally built for the kind of persistent, always-on connection many IoT use cases actually need.

MQTT maintains a persistent, lightweight connection specifically designed for devices with limited power and bandwidth, using a publish-subscribe model well suited to many devices sending frequent, small updates — it's become close to a default standard for modern IoT precisely because it was purpose-built for this pattern, unlike HTTP which was adapted to it.

For infrequent, simple data transfers (a daily report, an occasional configuration check), HTTP is perfectly adequate and simpler to implement. For frequent, real-time sensor data from battery-powered devices, MQTT's efficiency genuinely matters — this is a technical decision usually made by whoever's designing the device firmware and gateway architecture, not something end users need to actively choose.