The rapid development of the industry has been followed by the enormous amounts of data stored by various devices, but nowadays the most important ones are those with Internet access (IoT). There are many ways to communicate with such devices, and ensuring a secure and efficient data transmission is necessary. The aim of the thesis is to solve problems related to the successful reading of data from a device, establishing complete control over the device, and determining the device's behaviour in the event of malfunctioning. We have developed a data model for devices in the field of temperature control using the OPC UA standard, which presents us with a solution to all these problems. The thesis also shows an example of using the data model with simulated data of different devices such as furnaces and air conditioners. The developed data model can be used to control any temperature control device. This means monitoring its consumption, status, current temperature, gas flow, etc. The data model also extends the depreciation life of the device, as it includes the possibility of being informed of malfunctions. The knowledge we have gained from the content of the thesis can be used to build a data model for devices in any field. The newly created data model is not only limited to air conditioners, but can also be used in communication with other (more general) IoT devices such as the refrigerator, the car and the computer.
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