nRF Connect Device Manager is a generic tool for updating and managing devices running nRF Connect SDK supporting Device Manager module over Bluetooth LE (aka Management Subsystem, Mcu Manager, SMP Server).
Features:
Basic: echo, reset
Firmware update over-the-air (FOTA, DFU)
File System
Logs & stats
More documentation and APK file for Android 4.3 or later and iOS version 9 or later here: