Hello,
In my project I am creating a BLE service with 7 characteristics that are all NOTIFY only characteristics.
My service setup looks like the following:
BT_GATT_SERVICE_DEFINE(my_srvc, BT_GATT_PRIMARY_SERVICE(MY_SERVICE),
BT_GATT_CHARACTERISTIC(MY_CHAR_1, BT_GATT_CHRC_NOTIFY, BT_GATT_PERM_NONE, NULL, NULL, NULL),
BT_GATT_CCC(notifyStateChanged, BT_GATT_PERM_NONE),
BT_GATT_CHARACTERISTIC(MY_CHAR_2, BT_GATT_CHRC_NOTIFY, BT_GATT_PERM_NONE, NULL, NULL, NULL),
BT_GATT_CCC(notifyStateChanged, BT_GATT_PERM_NONE),
...etc...
As you can see from above, I'd like to use the same callback method (notifyStateChanged) to handle the enabling and disabling of the notifications. My issue is that it appears that the bt_gatt_attr object handed to the cb function cannot be used to identify the characteristic.
My callback looks like the following. I have attempted to use attr->uuid as well as the user_data->uuid in the bt_uuid_cmp() function but neither one works. When printing out those two uuid values, neither one represents the characteristic being enabled/disabled. Is there a way to accomplish my goal of using a single callback or must I create 7 different callback functions that all do the same thing other than having a different mask value?
static void notifyStateChanged(const struct bt_gatt_attr *attr, uint16_t value)
{
struct bt_gatt_chrc *user_data = attr->user_data;
bool enabled = (value==BT_GATT_CCC_NOTIFY);
int mask = 0;
if (bt_uuid_cmp(attr->uuid, MY_CHAR_1) == 0) {
mask = MYCHAR1_NOTIFY_FLAG_SET;
} else if (bt_uuid_cmp(attr->uuid, MY_CHAR_2) == 0) {
mask = MYCHAR2_NOTIFY_FLAG_SET;
} else ... {
...
}
if (enabled) {
notificationFlags |= mask;
} else {
notificationFlags &= ~mask;
}
}I am developing with VSCode + nRF Connect for VS Code. I am using version 2.7.0 of the nRF toolchain and SDK.
Thank you for any guidance on this issue.
-Mike