*1.1. Motivation*

The primary motivation for performing SLR is the ever-increasing trend of automation in Industry 4.0. Industry 4.0 is made up of both WSN technology and IoT to digitize work. Over time, we see how digitization and technology are replacing people in the workplace, and dramatically changing the global workforce. Technology has brought ease to human life and the efficiency of things by making them eco-friendly, more agile, and productive. From smart cities to smart industries, a drastic change has happened due to the intelligent usage of IoT and WSN and IR 4.0. For example, a smart factory integrates virtual and physical systems and calibrating instruments to record their readings immediately. In short, the integration of IoT and WSN with Industry 4.0 has reduced labour needs, freed humans from low-level skilled work, and improved the quantity and quality of work. Therefore, To

achieve better analysis results, we systematically analyzed almost all research data related to IoT and WSN domains in Industry 4.0.
