How to get UUID of Characteristic from a ble_evt_t?

RE: How to get UUID of Characteristic from a ble_evt_t?

Petter Myhre — Tue, 15 Nov 2016 07:03:41 GMT

Np :) You just got me a but confused.

RE: How to get UUID of Characteristic from a ble_evt_t?

Shiba Inu — Tue, 15 Nov 2016 04:25:45 GMT

Don't sweat it. Thanks for replying to the question though, :)

RE: How to get UUID of Characteristic from a ble_evt_t?

Shiba Inu — Tue, 15 Nov 2016 04:24:35 GMT

Thank you. I should've made it more clearer in my question that all I really was trying to do was to retrieve the UUID of a p_ble_evt that I receive from a BLE write event.

RE: How to get UUID of Characteristic from a ble_evt_t?

Petter Myhre — Mon, 14 Nov 2016 10:12:24 GMT

Your code doesn't make sense to me. Does it work? Have you tested it? If you get a BLE_GATTS_EVT_WRITE event, the UUID should be in p_ble_evt->evt.gatts_evt.params.write.uuid

RE: How to get UUID of Characteristic from a ble_evt_t?

Artucas — Mon, 14 Nov 2016 10:06:21 GMT

Oh, i am sorry. I accidentally converted your comment to the answer. Sorry for that.I think now i understand what you want to do, however i got no clue why do you want to do it that way. Anyway, i don't know the answer to that right now. I'll try to test it and give you the feedback as soon as possible. Maybe in the meantime you will get an answer from someone else here who knows that.

RE: How to get UUID of Characteristic from a ble_evt_t?

Shiba Inu — Mon, 14 Nov 2016 03:25:59 GMT

Thank you for responding. Sorry if I did not make my situation clear.

I am writing my own service with three different characteristics. Each characteristic has its own UUID (0x2000, 0x2001, and 0x2002). And I do have a function that responds to BLE_GATTS_EVT_WRITE's, as in, anytime a characteristic is update, either from a central or the peripheral device (on which I am running this application), the evt_write dispatch method (provided above) is invoked.

My objective right now is to be able to get the UUID of the characteristic being written.I was just inquiring as to if it was possible to get the UUID of the written characteristic from the ble_evt_t that is provided by the on_ble_evt(ble_evt_t * p_ble_evt) method in the main.c

RE: How to get UUID of Characteristic from a ble_evt_t?

Artucas — Sun, 13 Nov 2016 09:23:55 GMT

If i understoond your question correctly, then the answer would be no. The proper way is setting your own custom service with your characteristics. That way you can set up to get a callback when you have written something to any of your characteristics. You can set up a single handler for many characteristics and just check the value that you have written, or you can set up a different handler for every characteristic. That is up to you. How to set up your own service with characteristics can be found here: BLE Services, BLE Characteristics