OPC UA server on Raspberry Pi and Arduino for didactic use

In the market there are different alternatives in communication protocols, but most of them turn out to be specific to technology providers, thus making the implementation of the OPC UA protocol mean the possibility of eliminating proprietary barriers and making production processes more efficient. That is why in this work a didactic and affordable OPC UA system mounted on a Raspberry Pi is proposed that allows the writing and reading of data for the control of the ranges and operating states of actuators and sensors, thus allowing to introduce young university students to what is an environment of Industry 4.0 and the Internet of Things (IoT) so that in their professional future they achieve a rapid adaptation to the productive sector.