“…After analyzing all the references previously mentioned, it can be stated that the enhancements performed over power outlets have been mainly focused on the ability to control them remotely, by using wired [6,9,[11][12][13]15], wireless [4,7,8,10,14,[16][17][18][19][20][21][22], or hybrid interfaces [5]. Most of the wireless power outlets only carry out point-to-point communications (e.g., [4,5,7,16,17]), using technologies like Bluetooth [4,5,7,17], GSM [4,5,7,18], or WiFi [16].…”