Message Queued Telemetry Transport (MQTT)

It was created by Andy Standford-Clark and Arlen Nipper. It is an Internet of Things interaction protocol based on the publish/subscribe model. This model is a simple model that provides support for QoS (Quality of Service). Because of its capabilities, it can be found in every second IoT based device.The protocol has many characteristics because it is secure over TCP and uses SSL/TLS. For messaging between servers, it uses CONNECT, PUBLISH, SUBSCRIBE, DISCONNECT, etc.

Hypertext Transfer Protocol (HTTP)

The World Wide Web (WWW) uses it to define how its messages will be transmitted and formatted. This protocol is responsible for the actions that the server must take when sending information over the network. When a URL is entered into a browser, the protocol sends an HTTP request to the server and then sends an HTTP response back to the browser. The protocol is also responsible for controlling the format and presentation of Web pages on the World Wide Web.

Differences between MQTT and HTTP protocols