The next generation smartphone user's activity and direction detection system is a major challenging task because analyzing user activity and its detection using the surveillance camera or any other external sensors requires some fixed body which is not so convenient and also it is a tedious, time-consuming task involving high hardware cost. This book presents NG smartphone-based user's activity signals, positions, and directions detection system using a combination of the smartphone user's inbuilt accelerometer, gyroscope, orientation sensor, and BLE, Wi-Fi via MQTT protocol in IoT. To these...