CloudMQTT are managed Mosquitto servers in the cloud. Mosquitto implements the MQ Telemetry Transport protocol, MQTT, which provides lightweight methods of carrying out messaging using a publish/subscribe message queueing model.
Message queues provide an asynchronous communications protocol, the sender and receiver of the message do not need to interact with the message queue at the same time. Messages placed onto the queue are stored until the recipient retrieves them or until the messages times out. MQTT and Mosquitto are for good use by bandwidth sensitive applications.
CloudMQTT let you focus on the application instead of spending time on scaling the broker or patching the platform.