  The rise of Internet of things (IoT) technology has revolutionized urban
living, offering immense potential for smart cities in which smart home, smart
infrastructure, and smart industry are essential aspects that contribute to the
development of intelligent urban ecosystems. The integration of smart home
technology raises concerns regarding data privacy and security, while smart
infrastructure implementation demands robust networking and interoperability
solutions. Simultaneously, deploying IoT in industrial settings faces
challenges related to scalability, standardization, and data management. This
research paper offers a systematic literature review of published research in
the field of IoT in smart cities including 55 relevant primary studies that
have been published in reputable journals and conferences. This extensive
literature review explores and evaluates various aspects of smart home, smart
infrastructure, and smart industry and the challenges like security and
privacy, smart sensors, interoperability and standardization. We provide a
unified perspective, as we seek to enhance the efficiency and effectiveness of
smart cities while overcoming security concerns. It then explores their
potential for collective integration and impact on the development of smart
cities. Furthermore, this study addresses the challenges associated with each
component individually and explores their combined impact on enhancing urban
efficiency and sustainability. Through a comprehensive analysis of security
concerns, this research successfully integrates these IoT components in a
unified approach, presenting a holistic framework for building smart cities of
the future. Integrating smart home, smart infrastructure, and smart industry,
this research highlights the significance of an integrated approach in
developing smart cities.
