Smart homes are no longer the future, they have become a part of everyday life. Increasingly faster Internet, technology development, better operating systems and innovative applications make lifestyles easier for homeowners. Smart homes offer many quality services and complete control over devices in the house such as: lighting control, room temperature, multimedia, control over home security systems and complete control over each smart device which gives the user maximum comfort, energy efficiency and significant money savings. In order for all these smart devices to be able to communicate and exchange data and information, smart home protocols have been developed. The first part of the paper explains the concept of a smart home and the advantages of such installations and briefly describes its history. Then the individual parts of the system of such a house are described. In the second part of the paper, some of the more popular protocols in 2019, such as ZigBee, Zwave and Thread, are analytically processed and described.