Cloud connectivity — MQTT, CoAP, HTTP/2 from constrained devices

The Protocol Choices

Cellular IoT devices typically use one of three application protocols. MQTT (Message Queuing Telemetry Transport): publish/subscribe pattern over TCP, designed for constrained environments. Very low overhead — 2-byte fixed header. Persistent connection with keepalive ideal for cellular IoT. Major cloud platforms (AWS IoT Core, Azure IoT Hub, Google Cloud IoT) all support MQTT natively. CoAP (Constrained Application Protocol): RESTful pattern over UDP, designed for ultra-constrained devices. No persistent connection state — each interaction is independent. Supports both request-response and…