  While the application of IoT in smart technologies becomes more and more
proliferated, the pandemonium of its protocols becomes increasingly confusing.
More seriously, severe security deficiencies of these protocols become evident,
as time-to- market is a key factor, which satisfaction comes at the price of a
less thorough security design and testing. This applies especially to the smart
home domain, where the consumer-driven market demands quick and cheap
solutions. This paper presents an overview of IoT application domains and
discusses the most important wireless IoT protocols for smart home, which are
KNX-RF, EnOcean, Zigbee, Z-Wave and Thread. Finally, it describes the security
features of said protocols and compares them with each other, giving advice on
whose protocols are more suitable for a secure smart home.
