Is it complying to BLE specifications to a add a costume 128bit characteristic to a standard 16bit service?

[Ron]

Hey,

I want to use a standard 16bit service and to add some custome characteristics to it, will this create any compliance issues? Is it complying to BLE specifications to a add a costume 128bit characteristic to a standard 16bit service?

Thanks!

[Joakim Jakobsen]

Hi.

You should be fine adding a custom 128-bit characteristic to a BT SIG defined (16-bit) service.
Only thing that you need to consider is to generate the 128 bit UUID in a way that avoids tampling on existing BT ones.
If you need more information, you can read this:

https://www.novelbits.io/uuid-for-custom-services-and-characteristics/

Best regards,
Joakim