Guidance on Sending Distance Measurements to an Android App via GATT Service

[Gowtham Veluguri]

I am currently working on a distance measurement library using the nRF52840 DK and nRF52840 dongle. I have successfully obtained distance values on the serial terminal, but I need assistance in transmitting these values to an Android application.

Specifically, I would like to understand:

How to send distance values to an Android app (e.g., via BLE communication).
Is it possible to transmit these values to the nRF Connect application using a custom GATT service?
A step-by-step process to implement this, including defining the GATT service, setting up characteristics, and handling notifications or read requests on the Android side.
Any documentation, example implementations, or guidance on achieving this would be greatly appreciated.

Thank You in Advance...

[Amanda Hsieh]

Hi, 

Nordic Semiconductor has a custom GATT service called the Direction and Distance Finding Service (DDFS) which is designed for publishing distance measurement data. This service has a specific UUID and characteristics for distance measurements. See DDFS Documentation. You can use nRF Connect for mobile app to get the values. 

A step-by-step process to implement this, including defining the GATT service, setting up characteristics, and handling notifications or read requests on the Android side.

See this tutorial.

Regards,
Amanda H.