Creation of service with unique 128 bit UUID, characteristics with unique 128 bit UUID.

[aaris]

Hello,

Is it possible to create a GATT service with a 128 bit UUID, where each characteristic has a unique 128 bit UUID of it's own?

Looking at the examples, it seems as though you can implement a service with a base 128 bit UUID, then each 128 bit UUID within the service is based on this base address. In the software, the ble event data will only contain a 16 bit UUID.

Any help would be appreciated, thanks.

[bjorn-spockeli]

Yes, it is possible to configure the Service and its characteristics to use two different UUID bases. Please see the attached example, extract it to the nRF5_SDK_14.2.0_17b948a\examples\ble_peripheral\ folder

custom_ble_service_example_multiple_vs_bases.zip

[aaris]

Okay, thank you. So the software will still use a 16 bit UUID and this can be traced to a 128 bit UUID using the UUID type.

Is there an IAR project for this example by any chance?

Even .hex would be appreciated.

[bjorn-spockeli]

Yes, the 16-bit UUID is inserted as 12-13 octet in the 128-bit UUID base.  I only made this example for Keil, GCC and Segger Embedded Studio, but you should be able to copy the custom service code into the IAR project of the ble_app_template project. I have attached the .hex file generated using SES.

ble_app_template_pca10040_s132.hex

[aaris]

Understood, thanks for the response and attached .hex, very helpful!

[bjorn-spockeli]

Happy to help! If you're satisfied with the answer then I would appreciate if you could click on "More" and click "Suggest as answer".