Institute of Communications and Computer Systems (ICCS), Iroon Polytechneiou 9, 15773 Zografou, Athens, Greece · DASKALOS-APPS, 183 Rue de l’Abbé Griffon, 01960 Péronnas, France · National Technical University of Athens, Leof. Alimou, Katechaki, Zografou 15772, Athens, Greece +1