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Bluetooth: GATT: Add bt_gatt_unsubscribe

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This adds bt_gatt_unsubscribe which can used to unsubscribe to attribute
value notification using CCC handle.

Change-Id: I8a3b1594787a3322834516d0306a84c8ef7792dd
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Luiz Augusto von Dentz 2015-07-22 10:41:20 +03:00 • committed by Anas Nashif
commit 7006b5ae92
2 changed files with 64 additions and 0 deletions
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14
include/bluetooth/gatt.h
View file

@ -785,6 +785,20 @@ struct bt_gatt_subscribe_params {
int bt_gatt_subscribe(struct bt_conn *conn, uint16_t handle,
struct bt_gatt_subscribe_params *params);
/** @brief Unsubscribe Attribute Value Notification
*
* This procedure unsubscribe to value notification using the Client
* Characteristic Configuration handle.
*
* @param conn Connection object.
* @param handle CCC handle.
* @param params Subscribe parameters.
*
* @return 0 in case of success or negative value in case of error.
*/
int bt_gatt_unsubscribe(struct bt_conn *conn, uint16_t handle,
struct bt_gatt_subscribe_params *params);
/** @brief Cancel GATT pending request
*
* @param conn Connection object.

50
net/bluetooth/gatt.c
View file

@ -1093,6 +1093,56 @@ int bt_gatt_subscribe(struct bt_conn *conn, uint16_t handle,
att_write_ccc_rsp, params);
}
int bt_gatt_unsubscribe(struct bt_conn *conn, uint16_t handle,
struct bt_gatt_subscribe_params *params)
{
struct bt_gatt_subscribe_params *tmp;
bool has_subscription = false, found = false;
if (!conn && conn->state != BT_CONN_CONNECTED) {
return -ENOTCONN;
}
if (!handle || !params) {
return -EINVAL;
}
/* Check head */
if (subscriptions == params) {
subscriptions = params->_next;
found = true;
}
/* Lookup existing subscriptions */
for (tmp = subscriptions; tmp; tmp = tmp->_next) {
/* Remove subscription */
if (tmp->_next == params) {
tmp->_next = params->_next;
found = true;
}
/* Check if there still remains any other subscription */
if (!bt_addr_le_cmp(&tmp->_peer, &conn->dst) &&
tmp->value_handle == params->value_handle) {
has_subscription = true;
}
}
if (!found) {
return -EINVAL;
}
if (params->destroy) {
params->destroy(params);
}
if (has_subscription) {
return 0;
}
return gatt_write_ccc(conn, handle, 0x0000, NULL, NULL);
}
void bt_gatt_cancel(struct bt_conn *conn)
{
bt_att_cancel(conn);