You can visit the 2016 IPIN Competition website for logfiles documentation and databases used in 2016. For the 2017 competition, BLE4 is also available, the testing area covers 3 buildings (CAR, UJIUB, UJITI) and the base logfile structure remains unaltered.
ReadLogFile2017.m: Tool to open, process and represent the logfiles, including data from BLE4.