There are many calls for paper that discusses the Internet of things this year. Not only conferences but also IEEE transactions share the topic around the world. What IoT? IoT is everything that is connected to the Internet. Actually, what is IoT that people really want to talk about for use? Just toys like goods? Maybe no. IoT that are really needed is something more important to our daily life, such as eHealth devices. IoT must be discussed in such a way.