MQTT is a lightweight pub/sub messaging protocol.
What is MQTT?
MQTT (MQ Telemetry Transport) is a publish/subscribe, lightweight messaging protocol designed for constrained devices and low-bandwidth networks. One of the major uses of MQTT is with IoT (Internet of Things), where these principles are key to having effective communication between various devices.
MQTT can also be used with Ably as a basic event broker or if we don’t have an SDK for your target platform. However, without an SDK you don’t get access to the full range of platform features and data guarantees.