Which IoT protocol is commonly used for lightweight, bidirectional communication between IoT devices and the cloud?

A. MQTT (Message Queuing Telemetry Transport)

B. CoAP

C. HTTP/2

D. UDP (User Datagram Protocol)

Correct Answer is :

A. MQTT (Message Queuing Telemetry Transport)

Explanation

MQTT (Message Queuing Telemetry Transport)

Designed for low-bandwidth, high-latency, or unstable networks

Uses publish/subscribe messaging pattern

Ideal for constrained devices (low power, low memory)

Enables real-time, bidirectional communication (device ↔ cloud)