“…RF Source energy harvesting Backscatter Communications [11], [12], [13], [14], [15], [16], [17], [18] SWIPT [19], [20], [21], [22], [23], [24], [25], [26], [27] MET [28], [29], [30], [31] Solar Energy Harvesting [32], [33], [34], [35], [36] Thermal Energy Harvesting [37], [38], [39], [40] Mechanical Energy Harvesting [41], [42], [43] vices given that, neither cable-power nor battery replacement are feasible options in harsh conditions. Many energy saving software and hardware solutions, which we will present in our survey, have been developed in order to reduce IoT networks energy consumption and maintenance cost.…”