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");
memset(params, 0, sizeof(*params));
return BT_GATT_ITER_STOP;
}
printk("[ATTRIBUTE] handle %u\n", attr->handle);
if (BT_UUID_16(discover_params.uuid)->val == BT_UUID_HRS_VAL) {
uuid.val = BT_UUID_HRS_MEASUREMENT_VAL;
discover_params.uuid = &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_16(discover_params.uuid)->val ==
BT_UUID_HRS_MEASUREMENT_VAL) {
uuid.val = BT_UUID_GATT_CCC_VAL;
discover_params.uuid = &uuid.uuid;
discover_params.start_handle = attr->handle + 2;
discover_params.type = BT_GATT_DISCOVER_DESCRIPTOR;
subscribe_params.value_handle = attr->handle + 1;
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_STOP;
}
return BT_GATT_ITER_STOP;
}
bool BLECharacteristicImp::subscribe(void)
{
int retval = 0;
bt_conn_t* conn = NULL;
if (true == BLEUtils::isLocalBLE(_ble_device))
{
// GATT server can't subscribe
return false;
}
if (_gatt_chrc.properties & BT_GATT_CHRC_NOTIFY)
{
_sub_params.value |= BT_GATT_CCC_NOTIFY;
}
if (_gatt_chrc.properties & BT_GATT_CHRC_INDICATE)
{
_sub_params.value |= BT_GATT_CCC_INDICATE;
}
if (_sub_params.value == 0)
{
return false;
}
conn = bt_conn_lookup_addr_le(_ble_device.bt_le_address());
if (NULL == conn)
{
return false;
}
bt_addr_le_copy(&_sub_params._peer, bt_conn_get_dst(conn));
_sub_params.ccc_handle = _cccd_handle;
_sub_params.value_handle = _value_handle;
// Enable CCCD to allow peripheral send Notification/Indication
retval = bt_gatt_subscribe(conn, &_sub_params);
bt_conn_unref(conn);
if (0 == retval)
{
_subscribed = true;
}
return _subscribed;
}
static int cmd_gatt_subscribe(int argc, char *argv[])
{
int err;
if (subscribe_params.value_handle) {
printk("Cannot subscribe: subscription to %x already exists\n",
subscribe_params.value_handle);
return 0;
}
if (!default_conn) {
printk("Not connected\n");
return 0;
}
if (argc < 3) {
return -EINVAL;
}
subscribe_params.ccc_handle = strtoul(argv[1], NULL, 16);
subscribe_params.value_handle = strtoul(argv[2], NULL, 16);
subscribe_params.value = BT_GATT_CCC_NOTIFY;
subscribe_params.notify = notify_func;
if (argc > 3) {
subscribe_params.value = strtoul(argv[3], NULL, 16);
}
err = bt_gatt_subscribe(default_conn, &subscribe_params);
if (err) {
printk("Subscribe failed (err %d)\n", err);
} else {
printk("Subscribed\n");
}
return 0;
}