ProximIoT: A Proximity-based Product Marketing Platform. - Petros Manousis; Dimitris Louvaris; Konstantinos Lambropoulos; George Kelantonakis; Chrysostomos Zeginis; Kostas Magoutis; Konstantinos Petridis; Konstantinos Kalampokis; Stelios Gkouskos (EDBT/ICDT Workshops, 2023)