Qt MQTT enables you to create applications and devices that can communicate over the MQ telemetry transport (MQTT) protocol. It fully complies to the MQTT protocol specification.
Publish and Subscribe
MQTT is a machine-to-machine connectivity protocol that operates on the publish-and-subscribe model. An MQTT client is a program or device that uses MQTT to create a network connection to an MQTT server, also called a broker. Once a connection is created, the client can send messages to the broker. The other clients can subscribe to notifications on particular topics sent by the client.
For example, if Client 2 subscribes to messages on Topic A, it receives a notification when Client 1 sends a message on that topic. If Client 3subscribes to Topic A and Topic B, it receives notifications about messages on both those topics.
Qt MQTT is a client solution that does not include a broker. It is especially suitable for developing telemetry applications for embedded devices. However, Qt MQTT has no external dependencies, and therefore the implemented clients can be run on all supported Qt platforms.