Smart Farming is a revolutionary paradigm in the agri-food sector that integrates real-time data collection through various sensors and sources (i.e., the Internet of Things technologies (IoT) such as automation systems, farm bots, drones, and technological computer infrastructure). These integrated solutions support more intelligent decisions in the agricultural sector, increasing competitiveness and productivity in rural areas. However, there are difficulties with interoperability, security, data governance, farming practices diversity, farmer capacitation, and technology diffusion. End-users are heterogeneous, from illiterate producers to farm enterprises, which involves a custom ICT adoption strategy for each potential customer. This paper presents a systematic literature review that identifies the opportunities and barriers to adopting Smart Farming solutions in rural areas, highlighting the need to implement centered-user design strategies to increase the technology adoption considering two different types of farmers.