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Above diagram shows the basic building blocks for building an IoT system..

Below image shows where all IoT can be applied..

6) What is void pointer and what is its use? The void pointer means that it points to a variable that can be of any type. Other pointers points to a specific type of variable while void pointer is a somewhat generic pointer and can be pointed to any data type, be it standard data type(int, char etc) or user define data type (structure, union etc.). We can pass any kind of pointer and reference it as a void pointer. But to dereference it, we have to type the void pointer to correct data type.

We in this system, act as end-users and through the mobile app interact with Cloud (and in turn devices installed in our homes).

A Cloud/server infrastructure has detailed records about each and every device connected to it such as device id, a status of the device, what time was the device last accessed, number of times the device has been accessed and much more.

 Say, we have an AC in our room, now the temperature sensor installed in it in the room will be integrated with a gateway. A gateway’s purpose is to help connect the temperature sensor (inside the AC) to the Internet by making use of a cloud infrastructure.

A real life example of how IoT works..

Example of how IoT works.. shows it's all components..

iv. User Interface Next, the information made available to the end-user in some way. This can achieve by triggering alarms on their phones or notifying through texts or emails.