MQTT protocol in IoT environment: Comparison with CoAP and ZeroMQ protocols

The MQTT protocol is used today in various IoT applications, most often where it is necessary to support different levels of service quality in resource-constrained environments. By using it, it is possible to ensure a significantly higher level of programmability, making the IoT solution more flexible, reliable and scalable. However, in addition to MQTT, other protocols are also implemented in such environments. The aim of this research is to perform tests with different protocols in a near-realistic environment and to identify all the advantages and shortcomings that characterize the application of MQTT and other tested protocols.