Hello!
I am trying to set up a central that accepts notifications for two different attributes from a custom BLE service.
I know that the problem is in my discovery process seen below, and I have managed to figure out that it is either in the:
discover_params.start_handle = attr->handle part of the code OR it is in how I handle my switch if-statements.
I have watched this post How to enable multiple notifications in central side that had the same issue as me however I can't seem to get it right.
I have watched this post How to enable multiple notifications in central side that had the same issue as me however I can't seem to get it right.
All sample code that I have looked at on the central side does not handle multiple notifications/multiple attributes so they haven't helped me.
Note 1: I don't want to use the discovery manager so please don't suggest this.
Note 2: Everything from the peripheral works fine with the NRF Connect app so the peripheral is not the issue here.
static uint8_t discover_func(struct bt_conn *conn,
const struct bt_gatt_attr *attr,
struct bt_gatt_discover_params *params)
{
int err;
if (!attr) {
printk("Discover complete\n");
(void)memset(params, 0, sizeof(*params));
return BT_GATT_ITER_STOP;
}
printk("[ATTRIBUTE] handle %u\n", attr->handle);
if (!bt_uuid_cmp(discover_params.uuid, BT_UUID_FROG)) {
printk("Discovering TxDATA\n");
memcpy(&frog_discover_uuid, BT_UUID_TXDATA, sizeof(frog_discover_uuid));
discover_params.uuid = &frog_discover_uuid.uuid;
discover_params.start_handle = attr->handle + 1;
discover_params.type = BT_GATT_DISCOVER_CHARACTERISTIC;
err = bt_gatt_discover(conn, &discover_params);
if (err) {
printk("Discover failed (err %d)\n", err);
}
} else if ((!bt_uuid_cmp(discover_params.uuid, BT_UUID_FROG))) {
printk("Discovering RxCREDIT\n");
memcpy(&frog_discover_uuid, BT_UUID_RXCREDIT, sizeof(frog_discover_uuid));
discover_params.uuid = &frog_discover_uuid.uuid;
discover_params.start_handle = attr->handle + 2;
discover_params.type = BT_GATT_DISCOVER_CHARACTERISTIC;
err = bt_gatt_discover(conn, &discover_params);
if (err) {
printk("Discover failed (err %d)\n", err);
}
} else if (!bt_uuid_cmp(discover_params.uuid, BT_UUID_TXDATA)) {
printk("Discovering CCC TxData\n");
discover_params.uuid = ccc_uuid;
discover_params.start_handle = attr->handle + 3;
discover_params.type = BT_GATT_DISCOVER_DESCRIPTOR;
subscribe_params.value_handle = bt_gatt_attr_value_handle(attr);
err = bt_gatt_discover(conn, &discover_params);
if (err) {
printk("Discover failed (err %d)\n", err);
}
} else if (!bt_uuid_cmp(discover_params.uuid, BT_UUID_RXCREDIT)){
printk("Discovering CCC RxCredit\n");
discover_params.uuid = ccc_uuid2;
discover_params.start_handle = attr->handle + 4;
discover_params.type = BT_GATT_DISCOVER_DESCRIPTOR;
subscribe_params.value_handle = bt_gatt_attr_value_handle(attr);
err = bt_gatt_discover(conn, &discover_params);
if (err) {
printk("Discover failed (err %d)\n", err);
}
} else {
subscribe_params.notify = notify_func;
subscribe_params.value = BT_GATT_CCC_NOTIFY;
subscribe_params.ccc_handle = attr->handle;
err = bt_gatt_subscribe(conn, &subscribe_params);
if (err && err != -EALREADY) {
printk("Subscribe failed (err %d)\n", err);
} else {
printk("[SUBSCRIBED]\n");
}
return BT_GATT_ITER_CONTINUE;
}
return BT_GATT_ITER_STOP;
}
Thank you in advance and please let me know if I need to clarify or add some more information.
//Björn
