The Internet-of-Things (IoT) consists of a large number of different and heterogeneous devicesunder one umbrella. Building a typical architecture for the devices used in IoT is a challenge due to the involvement of a vast number of devices, layers, protocols, middleware, and software. The sensors in IoT have to monitor the activities regularly, making the end node devices energy hungry. Traditional fixed batteries get drained out in limited time, requiring continuous replacement, thereby increasing the budget. This article focuses on consumer technologies in the perspective of IoT computing targeted for smart villages and smart cities. The article discusses security-by-design (SbD) concepts in the energy harvester technologies for sustainable and secured IoT with uninterruptedenergy resource smart villages and smart cities.