Unable to do UUID compare in CCC function

[cgbdevelco]

Hello,
I have created different characteristics with the CCC macro (BT_GATT_CCC) that share the same "Configuration changed callback" function.

Inside the function below, i try to get the UUID of the characteristic to determine which one notifications has been enabled on.

static void cccCfgChanged(const struct bt_gatt_attr *attr, uint16_t value)
{
char str[BT_UUID_STR_LEN];
bt_uuid_to_str(attr->uuid, str, sizeof(str));
}
The function bt_uuid_to_str just give junk in the char array, does attr-uuid not contain the uuid of the characteristic which has enabled notifications?
I have also tried bt_uuid_cmp without any luck.

[Thalley]

@cgbdevelco Can you post what value you get in str?

I just tried your code, and I get 2902 (BT_UUID_GATT_CCC_VAL) as expected.

[cgbdevelco]

Maybe I just misunderstood and thought I could get the UUID of the characteristic which are linked with the CCC. Anyway I have solved this by using the bt_gatt_is_subscribed to check before using bt_gatt_notify instead of setting a flag,

[Thalley]

I am not aware of any way to get the value characteristic from the CCC. Perhaps @Vudentz knows if it is possible, but looks like it isn't.

The attr->user_data is supposedly a struct _bt_gatt_ccc, so we don't have a reference from the attr pointer at all.