nRF Toolbox works with a wide range of Bluetooth Low Energy accessories.
It contains applications demonstrating BLE profiles: Cycling Speed and Cadence, Running Speed and Cadence, Heart Rate Monitor, Blood Pressure Monitor, Health Thermometer, Glucose Monitor, Continuous Glucose Monitor, Proximity Monitor and more.
The Device Firmware Update (DFU) profile, that is also included, allows you to upload the application image over-the-air (OTA). It is compatible with Nordic Semiconductor nRF5x devices that have the SoftDevice and DFU Bootloader installed.
The source code of this application is available on GitHub:
https://github.com/NordicSemiconductor/iOS-nRF-Toolbox
The DFU Library is available here:
https://github.com/NordicSemiconductor/IOS-Pods-DFU-Library