Received July 18, 2020, accepted August 9, 2020, date of publication August 13, 2020, date of current version August 25, 2020. Digital Object Identifier 10.1109/ACCESS.2020.3016325 Precision Techniques and Agriculture 4.0 Technologies to Promote Sustainability in the Coffee Sector: State of the Art, Challenges and Future Trends MICHELE KREMER SOTT 1,2, LEONARDO BERTOLIN FURSTENAU 1, LIANE MAHLMANN KIPPER1, FÁBER D. GIRALDO 2, JOSÉ RICARDO LÓPEZ-ROBLES 3, MANUEL J. COBO 4, ADNAN ZAHID 5, (Graduate Student Member, IEEE), QAMMER H. ABBASI 5, (Senior Member, IEEE), AND MUHAMMAD ALI IMRAN 5, (Senior Member, IEEE) 1Graduate Program of Industrial Systems and Processes, University of Santa Cruz do Sul, Santa Cruz do Sul 96816-501, Brazil 2SINFOCI Research Group, Faculty of Engineering, University of Quindío, Armenia 630004, Colombia 3Postgraduate Program of Engineering and Applied Technology (National Laboratory CONACYT-SEDEAM), Autonomous University of Zacatecas, Zacatecas 98000, Mexico 4Department of Computer Engineering, University of Cádiz, 11519 Cádiz, Spain 5James Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, U.K. Corresponding author: Michele Kremer Sott (
[email protected]) This work was supported in part by the Engineering and Physical Sciences Research Council (EPSRC) Doctoral Training Grant (DTG) under Grant EP/N509668/1 Eng, in part by the double degree agreement between the Master in Industrial Systems and Processes of the University of Santa Cruz do Sul, Brazil, in part by the Master in Engineering with emphasis on Software Engineering of the University of Quindío, Colombia, in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Brazil, under Grant 001, in part by the National Council for Scientific and Technological Development (CNPq), Brazil, under Grant 303934/2019-0, in part by the Feder funds from the Spanish Government under Grant TIN2016-75850-R, in part by the Consejo Nacional de Ciencia y Tecnología (CONACYT), and in part by the Dirección General de Relaciones Exteriores (DGRI), Mexico.