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Bluetooth: GATT: Add bt_gatt_read

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This adds bt_gatt_read which can used to read attribute values.
Note: Attributes which values are bigger than the MTU need to be read
multiple time until the end since the stack cannot cache any data.

Change-Id: I09c502eeb674a577673182c35a0e1a84519fd3b7
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Luiz Augusto von Dentz 2015-07-13 14:07:04 +03:00 • committed by Anas Nashif
commit d982120a7e
2 changed files with 88 additions and 0 deletions
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22
include/bluetooth/gatt.h
View file

@ -709,6 +709,28 @@ int bt_gatt_discover_characteristic(struct bt_conn *conn,
int bt_gatt_discover_descriptor(struct bt_conn *conn,
struct bt_gatt_discover_params *params);
/** @brief Read callback function
*
* @param conn Connection object.
* @param err Error code.
* @param data Attribute value data.
* @param length Attribute value length.
*/
typedef void (*bt_gatt_read_func_t)(struct bt_conn *conn, int err,
const void *data, uint16_t length);
/** @brief Read Attribute Value by handle
*
* This procedure read the attribute value and return it to the callback.
*
* @param conn Connection object.
* @param handle Attribute handle.
* @param offset Attribute data offset.
* @param func Callback function.
*/
int bt_gatt_read(struct bt_conn *conn, uint16_t handle, uint16_t offset,
bt_gatt_read_func_t func);
/** @brief Cancel GATT pending request
*
* @param conn Connection object.

66
net/bluetooth/gatt.c
View file

@ -850,6 +850,72 @@ int bt_gatt_discover_descriptor(struct bt_conn *conn,
return 0;
}
static void att_read_rsp(struct bt_conn *conn, uint8_t err, const void *pdu,
uint16_t length, void *user_data)
{
bt_gatt_read_func_t func = user_data;
BT_DBG("err 0x%02x\n", err);
if (err) {
func(conn, err, NULL, 0);
return;
}
func(conn, 0, pdu, length);
}
static int gatt_read_blob(struct bt_conn *conn, uint16_t handle,
uint16_t offset, bt_gatt_read_func_t func)
{
struct bt_buf *buf;
struct bt_att_read_blob_req *req;
buf = bt_att_create_pdu(conn, BT_ATT_OP_READ_BLOB_REQ, sizeof(*req));
if (!buf) {
return -ENOMEM;
}
req = bt_buf_add(buf, sizeof(*req));
req->handle = sys_cpu_to_le16(handle);
req->offset = sys_cpu_to_le16(offset);
BT_DBG("handle 0x%04x offset 0x%04x\n", handle, offset);
bt_att_send(conn, buf, att_read_rsp, func, NULL);
return 0;
}
int bt_gatt_read(struct bt_conn *conn, uint16_t handle, uint16_t offset,
bt_gatt_read_func_t func)
{
struct bt_buf *buf;
struct bt_att_read_req *req;
if (!conn || !handle || !func) {
return -EINVAL;
}
if (offset) {
return gatt_read_blob(conn, handle, offset, func);
}
buf = bt_att_create_pdu(conn, BT_ATT_OP_READ_REQ, sizeof(*req));
if (!buf) {
return -ENOMEM;
}
req = bt_buf_add(buf, sizeof(*req));
req->handle = sys_cpu_to_le16(handle);
BT_DBG("handle 0x%04x\n", handle);
bt_att_send(conn, buf, att_read_rsp, func, NULL);
return 0;
}
void bt_gatt_cancel(struct bt_conn *conn)
{
bt_att_cancel(conn);