Performance Comparison Between OPC UA and MQTT for Data Exchange

With the new concepts brought by the Industry 4.0 and the Internet of Things (IoT), it is expected more equipment communicating with each other, using local and cloud computing servers. In order to the communication between the devices be efficient, fast and with time deterministic, it is necessary to choose a suitable network protocol. In this context, the article presents the performance comparison of quantity of used data and time spent to send and receive messages in two well-known protocols in the field of IoT and Industrial loT (IIoT): MQTT and OPC UA. The obtained values show the advantages of using each protocol in several scenarios, in order to exploit the best data exchange between devices.