MQTT

MQTT was Initially developed by IBM to create a protocol for minimal battery loss and bandwidth, connecting oil pipelines via satellite connection. It could be define such as a lightweight messaging protocol for small sensors and mobile devices, optimized for high-latency or unreliable networks.

MQTT protocol is based on TCP/IP, and all clients and the broker need to have a TCP/IP Stack.

Communication Architecture

The communication architecture is based on the client-server model where clients and servers are responsible for specific tasks. In general the roles are defined as the following:

• Server: awaits incoming connection requests by clients and provides resources or services

• Client: initiates the communication and requests the server’s content and functionalities

In MQTT there are two kinds of client types:

• Subscriber client: is interested in a special set of data from other publishers and registers as a potential recipient of data whenever it is published to the server

• Publisher client: provides data that can be interesting to subscribers by pushing data to the server whenever the data is changed or needs to be updated