int bt_uuid_cmp(const struct bt_uuid *u1, const struct bt_uuid *u2)
{
/* Convert to 128 bit if types don't match */
if (u1->type != u2->type)
return uuid128_cmp(u1, u2);
switch (u1->type) {
case BT_UUID_TYPE_16:
return (int)BT_UUID_16(u1)->val - (int)BT_UUID_16(u2)->val;
case BT_UUID_TYPE_128:
return memcmp(BT_UUID_128(u1)->val, BT_UUID_128(u2)->val, 16);
}
return -EINVAL;
}
void bt_uuid_to_str(const struct bt_uuid *uuid, char *str, size_t len)
{
uint32_t tmp1, tmp5;
uint16_t tmp0, tmp2, tmp3, tmp4;
switch (uuid->type) {
case BT_UUID_TYPE_16:
snprintf(str, len, "%.4x", BT_UUID_16(uuid)->val);
break;
case BT_UUID_TYPE_128:
memcpy(&tmp0, &BT_UUID_128(uuid)->val[0], sizeof(tmp0));
memcpy(&tmp1, &BT_UUID_128(uuid)->val[2], sizeof(tmp1));
memcpy(&tmp2, &BT_UUID_128(uuid)->val[6], sizeof(tmp2));
memcpy(&tmp3, &BT_UUID_128(uuid)->val[8], sizeof(tmp3));
memcpy(&tmp4, &BT_UUID_128(uuid)->val[10], sizeof(tmp4));
memcpy(&tmp5, &BT_UUID_128(uuid)->val[12], sizeof(tmp5));
snprintf(str, len, "%.8x-%.4x-%.4x-%.4x-%.8x%.4x",
tmp5, tmp4, tmp3, tmp2, tmp1, tmp0);
break;
default:
memset(str, 0, len);
return;
}
}
static uint8_t find_info_cb(const struct bt_gatt_attr *attr, void *user_data)
{
struct find_info_data *data = user_data;
struct bt_att *att = data->att;
BT_DBG("handle 0x%04x", attr->handle);
/* Initialize rsp at first entry */
if (!data->rsp) {
data->rsp = net_buf_add(data->buf, sizeof(*data->rsp));
data->rsp->format = (attr->uuid->type == BT_UUID_TYPE_16) ?
BT_ATT_INFO_16 : BT_ATT_INFO_128;
}
switch (data->rsp->format) {
case BT_ATT_INFO_16:
if (attr->uuid->type != BT_UUID_TYPE_16) {
return BT_GATT_ITER_STOP;
}
/* Fast foward to next item position */
data->info16 = net_buf_add(data->buf, sizeof(*data->info16));
data->info16->handle = sys_cpu_to_le16(attr->handle);
data->info16->uuid = sys_cpu_to_le16(BT_UUID_16(attr->uuid)->val);
if (att->chan.tx.mtu - data->buf->len > sizeof(*data->info16)) {
return BT_GATT_ITER_CONTINUE;
}
break;
case BT_ATT_INFO_128:
if (attr->uuid->type != BT_UUID_TYPE_128) {
return BT_GATT_ITER_STOP;
}
/* Fast foward to next item position */
data->info128 = net_buf_add(data->buf, sizeof(*data->info128));
data->info128->handle = sys_cpu_to_le16(attr->handle);
memcpy(data->info128->uuid, BT_UUID_128(attr->uuid)->val,
sizeof(data->info128->uuid));
if (att->chan.tx.mtu - data->buf->len >
sizeof(*data->info128)) {
return BT_GATT_ITER_CONTINUE;
}
}
return BT_GATT_ITER_STOP;
}
static bool uuid_create(struct bt_uuid *uuid, struct net_buf *buf)
{
switch (buf->len) {
case 2:
uuid->type = BT_UUID_TYPE_16;
BT_UUID_16(uuid)->val = net_buf_pull_le16(buf);
return true;
case 16:
uuid->type = BT_UUID_TYPE_128;
memcpy(BT_UUID_128(uuid)->val, buf->data, buf->len);
return true;
}
return false;
}
int bt_gatt_attr_read_service(struct bt_conn *conn,
const struct bt_gatt_attr *attr,
void *buf, uint16_t len, uint16_t offset)
{
struct bt_uuid *uuid = attr->user_data;
if (uuid->type == BT_UUID_TYPE_16) {
uint16_t uuid16 = sys_cpu_to_le16(BT_UUID_16(uuid)->val);
return bt_gatt_attr_read(conn, attr, buf, len, offset,
&uuid16, 2);
}
return bt_gatt_attr_read(conn, attr, buf, len, offset,
BT_UUID_128(uuid)->val, 16);
}
static int att_find_type(struct bt_conn *conn,
struct bt_gatt_discover_params *params)
{
struct net_buf *buf;
struct bt_att_find_type_req *req;
buf = bt_att_create_pdu(conn, BT_ATT_OP_FIND_TYPE_REQ, sizeof(*req));
if (!buf) {
return -ENOMEM;
}
req = net_buf_add(buf, sizeof(*req));
req->start_handle = sys_cpu_to_le16(params->start_handle);
req->end_handle = sys_cpu_to_le16(params->end_handle);
if (params->type == BT_GATT_DISCOVER_PRIMARY) {
req->type = sys_cpu_to_le16(BT_UUID_GATT_PRIMARY_VAL);
} else {
req->type = sys_cpu_to_le16(BT_UUID_GATT_SECONDARY_VAL);
}
BT_DBG("uuid %s start_handle 0x%04x end_handle 0x%04x",
bt_uuid_str(params->uuid), params->start_handle,
params->end_handle);
switch (params->uuid->type) {
case BT_UUID_TYPE_16:
net_buf_add_le16(buf, BT_UUID_16(params->uuid)->val);
break;
case BT_UUID_TYPE_128:
memcpy(net_buf_add(buf, 16),
BT_UUID_128(params->uuid)->val, 16);
break;
default:
BT_ERR("Unknown UUID type %u", params->uuid->type);
net_buf_unref(buf);
return -EINVAL;
}
return gatt_send(conn, buf, att_find_type_rsp, params, NULL);
}
int bt_gatt_attr_read_chrc(struct bt_conn *conn,
const struct bt_gatt_attr *attr, void *buf,
uint16_t len, uint16_t offset)
{
struct bt_gatt_chrc *chrc = attr->user_data;
struct gatt_chrc pdu;
const struct bt_gatt_attr *next;
uint8_t value_len;
pdu.properties = chrc->properties;
/* BLUETOOTH SPECIFICATION Version 4.2 [Vol 3, Part G] page 534:
* 3.3.2 Characteristic Value Declaration
* The Characteristic Value declaration contains the value of the
* characteristic. It is the first Attribute after the characteristic
* declaration. All characteristic definitions shall have a
* Characteristic Value declaration.
*/
next = bt_gatt_attr_next(attr);
if (!next) {
BT_WARN("No value for characteristic at 0x%04x", attr->handle);
pdu.value_handle = 0x0000;
} else {
pdu.value_handle = sys_cpu_to_le16(next->handle);
}
value_len = sizeof(pdu.properties) + sizeof(pdu.value_handle);
if (chrc->uuid->type == BT_UUID_TYPE_16) {
pdu.uuid16 = sys_cpu_to_le16(BT_UUID_16(chrc->uuid)->val);
value_len += 2;
} else {
memcpy(pdu.uuid, BT_UUID_128(chrc->uuid)->val, 16);
value_len += 16;
}
return bt_gatt_attr_read(conn, attr, buf, len, offset, &pdu, value_len);
}
