RE: I want to send data from sensors to central Android via BLE communication

y001 — Wed, 17 Apr 2019 01:10:53 GMT

Thank you for reply!
I'll try!

RE: I want to send data from sensors to central Android via BLE communication

William E. — Thu, 11 Apr 2019 12:50:37 GMT

When I created my first custom BLE service I followed this guide:

https://github.com/NordicPlayground/nRF5x-custom-ble-service-tutorial

It takes some time but the guide is complete and good for creating your first service.

You can design you service how ever you like but for accelerometer data I suggest that you use notification and serialize the data into an array of values that you then deserialize on the Android side for best performance.

For example a very simple accelerometer service might have a xyz characteristic where you pack a constant number of bits for each x, y, z-axis, depending on the characteristic max length you can then fit many samples into one notification.

On the app-side you can use

https://github.com/NordicSemiconductor/Android-nRF-Toolbox

and modify the Template application to fit your needs.