MQTT is a connectivity protocol for machine-to-machine(M2M) interactions, also known as Internet of things . It was designed as an extremely lightweight publish/subscribe messaging transport protocol unlike a heavier one request/response used for HTTP.
It is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium.
Read the official documentation of MQTT here.
MQTT on Connect iPaaS¶
Connect iPaaS enables you to connect with your MQTT broker in real-time by just providing the broker's credentials. You can watch for changes in any IoT device via MQTT broker or you can send events to an IoT device based on trigger events from your desired applications.