I. Introduction
A rapid transformation of the technology era has introduced a new lifestyle. In the previous decade, we use the internet mainly for communications: e-mail, chatting, video calls. However, the internet helps us in almost every aspect of our daily lives, from online shopping, navigation, and work. Recently, the internet is not only connecting people; it also connects machines to facilitate social works and increase productivity. Such a scheme is called Internet-of-Things (IoT) [1]. The IoT enables us to maintain services conveniently: without any human intervention. For example, in agriculture, we can automatically give nutrition to the plantations by reading its temperature, humidity, and nutrition level. The actuators will then act to add more nutrition based on the reading. Farmers can control and monitor the situation anywhere in the world since they can read all parameters by using the internet. In 2020, an IoT technology would widely implement in various objects: from connecting people, services, vehicles, to home and buildings. [2]