This article gives an overview of Bluetooth and Bluetooth Low Energy. Furthermore, it presents BlueTrk+, a lightweight application for tracking presence and position securely and flexibly for military-related or Disconnected, Intermittent and Limited (DIL) environments. For tracking presence, four schemes with varying security levels are presented for broadcasting identities. For tracking position, a polar coordinate-based approach is used. It involves using a radar-inspired method for estimating direction/angle and a machine learning method for estimating distance. Experimental results are presented to evaluate the positioning methods.
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