RE: Checking my understanding of 128-bit UUIDs.

Joakim Jakobsen — Mon, 19 Mar 2018 15:13:14 GMT

Hi!

From what I can see the statements in your post is correct.

"In reality, ALL the base UUIDs are 128-bits, and once installed, ALL the relevant API calls deal with 16-bit UUIDs that
replace bytes 12 and 13 in the base UUID. Is that right?"
Yes, that is correct. The 16-bit Bluetooth SIG UUID's' uses a Base UUID provided by BT SIG. And that is, as you suggested in your question, already added in the softdevice.

"Therefore, once the service is initialized and the characteristics added, there is no need to keep track of
the index in the ble_uuid_t variable returned from "sd_ble_uuid_vs_add". Is that right?"
That is correct. You need to declare which type you are adding to the service/characteristic, but after the services/characteristics is added, you no longer need to keep track of the variable.

Let me know if you have any more questions.
Cheers,
Joakim.