blob: 6665f3d6d3f025cc3dc1f322c29712c75b5ee9dc [file] [log] [blame]
/* gatt.c - Generic Attribute Profile handling */
/*
* Copyright (c) 2015-2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr.h>
#include <string.h>
#include <errno.h>
#include <stdbool.h>
#include <atomic.h>
#include <misc/byteorder.h>
#include <misc/util.h>
#define BT_DBG_ENABLED IS_ENABLED(CONFIG_BLUETOOTH_DEBUG_GATT)
#include <bluetooth/log.h>
#include <bluetooth/hci.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/uuid.h>
#include <bluetooth/gatt.h>
#include <bluetooth/hci_driver.h>
#include "hci_core.h"
#include "conn_internal.h"
#include "keys.h"
#include "l2cap_internal.h"
#include "att_internal.h"
#include "smp.h"
#include "gatt_internal.h"
static struct bt_gatt_attr *db;
#if defined(CONFIG_BLUETOOTH_GATT_CLIENT)
static sys_slist_t subscriptions;
#endif /* CONFIG_BLUETOOTH_GATT_CLIENT */
#if !defined(CONFIG_BLUETOOTH_GATT_DYNAMIC_DB)
static size_t attr_count;
#endif /* CONFIG_BLUETOOTH_GATT_DYNAMIC_DB */
int bt_gatt_register(struct bt_gatt_attr *attrs, size_t count)
{
#if defined(CONFIG_BLUETOOTH_GATT_DYNAMIC_DB)
struct bt_gatt_attr *last;
#endif /* CONFIG_BLUETOOTH_GATT_DYNAMIC_DB */
uint16_t handle;
if (!attrs || !count) {
return -EINVAL;
}
#if !defined(CONFIG_BLUETOOTH_GATT_DYNAMIC_DB)
handle = 0;
db = attrs;
attr_count = count;
#else
if (!db) {
db = attrs;
last = NULL;
handle = 0;
goto populate;
}
/* Fast forward to last attribute in the list */
for (last = db; last->_next;) {
last = last->_next;
}
handle = last->handle;
last->_next = attrs;
populate:
#endif /* CONFIG_BLUETOOTH_GATT_DYNAMIC_DB */
/* Populate the handles and _next pointers */
for (; attrs && count; attrs++, count--) {
if (!attrs->handle) {
/* Allocate handle if not set already */
attrs->handle = ++handle;
} else if (attrs->handle > handle) {
/* Use existing handle if valid */
handle = attrs->handle;
} else {
/* Service has conflicting handles */
#if defined(CONFIG_BLUETOOTH_GATT_DYNAMIC_DB)
last->_next = NULL;
#endif
BT_ERR("Unable to register handle 0x%04x",
attrs->handle);
return -EINVAL;
}
#if defined(CONFIG_BLUETOOTH_GATT_DYNAMIC_DB)
if (count > 1) {
attrs->_next = &attrs[1];
}
#endif
BT_DBG("attr %p next %p handle 0x%04x uuid %s perm 0x%02x",
attrs, bt_gatt_attr_next(attrs), attrs->handle,
bt_uuid_str(attrs->uuid), attrs->perm);
}
return 0;
}
ssize_t bt_gatt_attr_read(struct bt_conn *conn, const struct bt_gatt_attr *attr,
void *buf, uint16_t buf_len, uint16_t offset,
const void *value, uint16_t value_len)
{
uint16_t len;
if (offset > value_len) {
return BT_GATT_ERR(BT_ATT_ERR_INVALID_OFFSET);
}
len = min(buf_len, value_len - offset);
BT_DBG("handle 0x%04x offset %u length %u", attr->handle, offset,
len);
memcpy(buf, value + offset, len);
return len;
}
ssize_t 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);
}
struct gatt_incl {
uint16_t start_handle;
uint16_t end_handle;
uint16_t uuid16;
} __packed;
static uint8_t get_service_handles(const struct bt_gatt_attr *attr,
void *user_data)
{
struct gatt_incl *include = user_data;
/* Stop if attribute is a service */
if (!bt_uuid_cmp(attr->uuid, BT_UUID_GATT_PRIMARY) ||
!bt_uuid_cmp(attr->uuid, BT_UUID_GATT_SECONDARY)) {
return BT_GATT_ITER_STOP;
}
include->end_handle = attr->handle;
return BT_GATT_ITER_CONTINUE;
}
ssize_t bt_gatt_attr_read_included(struct bt_conn *conn,
const struct bt_gatt_attr *attr,
void *buf, uint16_t len, uint16_t offset)
{
struct bt_gatt_attr *incl = attr->user_data;
struct bt_uuid *uuid = incl->user_data;
struct gatt_incl pdu;
uint8_t value_len;
/* first attr points to the start handle */
pdu.start_handle = sys_cpu_to_le16(incl->handle);
value_len = sizeof(pdu.start_handle) + sizeof(pdu.end_handle);
/*
* Core 4.2, Vol 3, Part G, 3.2,
* The Service UUID shall only be present when the UUID is a
* 16-bit Bluetooth UUID.
*/
if (uuid->type == BT_UUID_TYPE_16) {
pdu.uuid16 = sys_cpu_to_le16(BT_UUID_16(uuid)->val);
value_len += sizeof(pdu.uuid16);
}
/* Lookup for service end handle */
bt_gatt_foreach_attr(incl->handle + 1, 0xffff, get_service_handles,
&pdu);
return bt_gatt_attr_read(conn, attr, buf, len, offset, &pdu, value_len);
}
struct gatt_chrc {
uint8_t properties;
uint16_t value_handle;
union {
uint16_t uuid16;
uint8_t uuid[16];
};
} __packed;
ssize_t 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);
}
void bt_gatt_foreach_attr(uint16_t start_handle, uint16_t end_handle,
bt_gatt_attr_func_t func, void *user_data)
{
const struct bt_gatt_attr *attr;
for (attr = db; attr; attr = bt_gatt_attr_next(attr)) {
/* Check if attribute handle is within range */
if (attr->handle < start_handle || attr->handle > end_handle) {
continue;
}
if (func(attr, user_data) == BT_GATT_ITER_STOP) {
break;
}
}
}
struct bt_gatt_attr *bt_gatt_attr_next(const struct bt_gatt_attr *attr)
{
#if defined(CONFIG_BLUETOOTH_GATT_DYNAMIC_DB)
return attr->_next;
#else
return ((attr < db || attr > &db[attr_count - 2]) ? NULL :
(struct bt_gatt_attr *)&attr[1]);
#endif /* CONFIG_BLUETOOTH_GATT_DYNAMIC_DB */
}
ssize_t bt_gatt_attr_read_ccc(struct bt_conn *conn,
const struct bt_gatt_attr *attr, void *buf,
uint16_t len, uint16_t offset)
{
struct _bt_gatt_ccc *ccc = attr->user_data;
uint16_t value;
size_t i;
for (i = 0; i < ccc->cfg_len; i++) {
if (bt_conn_addr_le_cmp(conn, &ccc->cfg[i].peer)) {
continue;
}
value = sys_cpu_to_le16(ccc->cfg[i].value);
break;
}
/* Default to disable if there is no cfg for the peer */
if (i == ccc->cfg_len) {
value = 0x0000;
}
return bt_gatt_attr_read(conn, attr, buf, len, offset, &value,
sizeof(value));
}
static void gatt_ccc_changed(const struct bt_gatt_attr *attr,
struct _bt_gatt_ccc *ccc)
{
int i;
uint16_t value = 0x0000;
for (i = 0; i < ccc->cfg_len; i++) {
if (ccc->cfg[i].value > value) {
value = ccc->cfg[i].value;
}
}
BT_DBG("ccc %p value 0x%04x", ccc, value);
if (value != ccc->value) {
ccc->value = value;
ccc->cfg_changed(attr, value);
}
}
ssize_t bt_gatt_attr_write_ccc(struct bt_conn *conn,
const struct bt_gatt_attr *attr, const void *buf,
uint16_t len, uint16_t offset, uint8_t flags)
{
struct _bt_gatt_ccc *ccc = attr->user_data;
uint16_t value;
size_t i;
if (offset > sizeof(uint16_t)) {
return BT_GATT_ERR(BT_ATT_ERR_INVALID_OFFSET);
}
if (offset + len > sizeof(uint16_t)) {
return BT_GATT_ERR(BT_ATT_ERR_INVALID_ATTRIBUTE_LEN);
}
value = sys_get_le16(buf);
for (i = 0; i < ccc->cfg_len; i++) {
/* Check for existing configuration */
if (!bt_conn_addr_le_cmp(conn, &ccc->cfg[i].peer)) {
break;
}
}
if (i == ccc->cfg_len) {
for (i = 0; i < ccc->cfg_len; i++) {
/* Check for unused configuration */
if (ccc->cfg[i].valid) {
continue;
}
bt_addr_le_copy(&ccc->cfg[i].peer, &conn->le.dst);
if (value) {
ccc->cfg[i].valid = true;
}
break;
}
if (i == ccc->cfg_len) {
BT_WARN("No space to store CCC cfg");
return BT_GATT_ERR(BT_ATT_ERR_INSUFFICIENT_RESOURCES);
}
} else if (!value) {
/* free existing configuration for default value */
ccc->cfg[i].valid = false;
}
ccc->cfg[i].value = value;
BT_DBG("handle 0x%04x value %u", attr->handle, ccc->cfg[i].value);
/* Update cfg if don't match */
if (ccc->cfg[i].value != ccc->value) {
gatt_ccc_changed(attr, ccc);
}
return len;
}
ssize_t bt_gatt_attr_read_cep(struct bt_conn *conn,
const struct bt_gatt_attr *attr, void *buf,
uint16_t len, uint16_t offset)
{
struct bt_gatt_cep *value = attr->user_data;
uint16_t props = sys_cpu_to_le16(value->properties);
return bt_gatt_attr_read(conn, attr, buf, len, offset, &props,
sizeof(props));
}
ssize_t bt_gatt_attr_read_cud(struct bt_conn *conn,
const struct bt_gatt_attr *attr, void *buf,
uint16_t len, uint16_t offset)
{
char *value = attr->user_data;
return bt_gatt_attr_read(conn, attr, buf, len, offset, value,
strlen(value));
}
ssize_t bt_gatt_attr_read_cpf(struct bt_conn *conn,
const struct bt_gatt_attr *attr, void *buf,
uint16_t len, uint16_t offset)
{
struct bt_gatt_cpf *value = attr->user_data;
return bt_gatt_attr_read(conn, attr, buf, len, offset, value,
sizeof(*value));
}
struct notify_data {
uint16_t type;
const struct bt_gatt_attr *attr;
const void *data;
uint16_t len;
struct bt_gatt_indicate_params *params;
};
static int gatt_notify(struct bt_conn *conn, uint16_t handle, const void *data,
size_t len)
{
struct net_buf *buf;
struct bt_att_notify *nfy;
buf = bt_att_create_pdu(conn, BT_ATT_OP_NOTIFY, sizeof(*nfy) + len);
if (!buf) {
BT_WARN("No buffer available to send notification");
return -ENOMEM;
}
BT_DBG("conn %p handle 0x%04x", conn, handle);
nfy = net_buf_add(buf, sizeof(*nfy));
nfy->handle = sys_cpu_to_le16(handle);
net_buf_add(buf, len);
memcpy(nfy->value, data, len);
bt_l2cap_send(conn, BT_L2CAP_CID_ATT, buf);
return 0;
}
static void gatt_indicate_rsp(struct bt_conn *conn, uint8_t err,
const void *pdu, uint16_t length, void *user_data)
{
struct bt_gatt_indicate_params *params = user_data;
params->func(conn, params->attr, err);
}
static int gatt_send(struct bt_conn *conn, struct net_buf *buf,
bt_att_func_t func, void *params,
bt_att_destroy_t destroy)
{
int err;
if (params) {
struct bt_att_req *req = params;
req->buf = buf;
req->func = func;
req->destroy = destroy;
err = bt_att_req_send(conn, req);
} else {
err = bt_att_send(conn, buf);
}
if (err) {
BT_ERR("Error sending ATT PDU: %d", err);
net_buf_unref(buf);
}
return err;
}
static int gatt_indicate(struct bt_conn *conn,
struct bt_gatt_indicate_params *params)
{
struct net_buf *buf;
struct bt_att_indicate *ind;
buf = bt_att_create_pdu(conn, BT_ATT_OP_INDICATE,
sizeof(*ind) + params->len);
if (!buf) {
BT_WARN("No buffer available to send indication");
return -ENOMEM;
}
BT_DBG("conn %p handle 0x%04x", conn, params->attr->handle);
ind = net_buf_add(buf, sizeof(*ind));
ind->handle = sys_cpu_to_le16(params->attr->handle);
net_buf_add(buf, params->len);
memcpy(ind->value, params->data, params->len);
return gatt_send(conn, buf, gatt_indicate_rsp, params, NULL);
}
static uint8_t notify_cb(const struct bt_gatt_attr *attr, void *user_data)
{
struct notify_data *data = user_data;
struct _bt_gatt_ccc *ccc;
size_t i;
if (bt_uuid_cmp(attr->uuid, BT_UUID_GATT_CCC)) {
/* Stop if we reach the next characteristic */
if (!bt_uuid_cmp(attr->uuid, BT_UUID_GATT_CHRC)) {
return BT_GATT_ITER_STOP;
}
return BT_GATT_ITER_CONTINUE;
}
/* Check attribute user_data must be of type struct _bt_gatt_ccc */
if (attr->write != bt_gatt_attr_write_ccc) {
return BT_GATT_ITER_CONTINUE;
}
ccc = attr->user_data;
/* Notify all peers configured */
for (i = 0; i < ccc->cfg_len; i++) {
struct bt_conn *conn;
int err;
if (ccc->value != data->type) {
continue;
}
conn = bt_conn_lookup_addr_le(&ccc->cfg[i].peer);
if (!conn) {
continue;
}
if (conn->state != BT_CONN_CONNECTED) {
bt_conn_unref(conn);
continue;
}
if (data->type == BT_GATT_CCC_INDICATE) {
err = gatt_indicate(conn, data->params);
} else {
err = gatt_notify(conn, data->attr->handle, data->data,
data->len);
}
bt_conn_unref(conn);
if (err < 0) {
return BT_GATT_ITER_STOP;
}
}
return BT_GATT_ITER_CONTINUE;
}
int bt_gatt_notify(struct bt_conn *conn, const struct bt_gatt_attr *attr,
const void *data, uint16_t len)
{
struct notify_data nfy;
if (!attr || !attr->handle) {
return -EINVAL;
}
if (conn) {
return gatt_notify(conn, attr->handle, data, len);
}
nfy.attr = attr;
nfy.type = BT_GATT_CCC_NOTIFY;
nfy.data = data;
nfy.len = len;
bt_gatt_foreach_attr(attr->handle, 0xffff, notify_cb, &nfy);
return 0;
}
int bt_gatt_indicate(struct bt_conn *conn,
struct bt_gatt_indicate_params *params)
{
struct notify_data nfy;
if (!params || !params->attr || !params->attr->handle) {
return -EINVAL;
}
if (conn) {
return gatt_indicate(conn, params);
}
nfy.type = BT_GATT_CCC_INDICATE;
nfy.params = params;
bt_gatt_foreach_attr(params->attr->handle, 0xffff, notify_cb, &nfy);
return 0;
}
static uint8_t connected_cb(const struct bt_gatt_attr *attr, void *user_data)
{
struct bt_conn *conn = user_data;
struct _bt_gatt_ccc *ccc;
size_t i;
/* Check attribute user_data must be of type struct _bt_gatt_ccc */
if (attr->write != bt_gatt_attr_write_ccc) {
return BT_GATT_ITER_CONTINUE;
}
ccc = attr->user_data;
/* If already enabled skip */
if (ccc->value) {
return BT_GATT_ITER_CONTINUE;
}
for (i = 0; i < ccc->cfg_len; i++) {
/* Ignore configuration for different peer */
if (bt_conn_addr_le_cmp(conn, &ccc->cfg[i].peer)) {
continue;
}
if (ccc->cfg[i].value) {
gatt_ccc_changed(attr, ccc);
return BT_GATT_ITER_CONTINUE;
}
}
return BT_GATT_ITER_CONTINUE;
}
static uint8_t disconnected_cb(const struct bt_gatt_attr *attr, void *user_data)
{
struct bt_conn *conn = user_data;
struct _bt_gatt_ccc *ccc;
size_t i;
/* Check attribute user_data must be of type struct _bt_gatt_ccc */
if (attr->write != bt_gatt_attr_write_ccc) {
return BT_GATT_ITER_CONTINUE;
}
ccc = attr->user_data;
/* If already disabled skip */
if (!ccc->value) {
return BT_GATT_ITER_CONTINUE;
}
for (i = 0; i < ccc->cfg_len; i++) {
/* Ignore configurations with disabled value */
if (!ccc->cfg[i].value) {
continue;
}
if (bt_conn_addr_le_cmp(conn, &ccc->cfg[i].peer)) {
struct bt_conn *tmp;
/* Skip if there is another peer connected */
tmp = bt_conn_lookup_addr_le(&ccc->cfg[i].peer);
if (tmp) {
if (tmp->state == BT_CONN_CONNECTED) {
bt_conn_unref(tmp);
return BT_GATT_ITER_CONTINUE;
}
bt_conn_unref(tmp);
}
} else {
/* Clear value if not paired */
if (!bt_addr_le_is_bonded(&conn->le.dst)) {
ccc->cfg[i].valid = false;
memset(&ccc->cfg[i].value, 0,
sizeof(ccc->cfg[i].value));
} else {
/* Update address in case it has changed */
bt_addr_le_copy(&ccc->cfg[i].peer,
&conn->le.dst);
}
}
}
/* Reset value while disconnected */
memset(&ccc->value, 0, sizeof(ccc->value));
if (ccc->cfg_changed) {
ccc->cfg_changed(attr, ccc->value);
}
BT_DBG("ccc %p reseted", ccc);
return BT_GATT_ITER_CONTINUE;
}
#if defined(CONFIG_BLUETOOTH_GATT_CLIENT)
void bt_gatt_notification(struct bt_conn *conn, uint16_t handle,
const void *data, uint16_t length)
{
struct bt_gatt_subscribe_params *params, *tmp, *prev = NULL;
BT_DBG("handle 0x%04x length %u", handle, length);
SYS_SLIST_FOR_EACH_CONTAINER_SAFE(&subscriptions, params, tmp, node) {
if (bt_conn_addr_le_cmp(conn, &params->_peer) ||
handle != params->value_handle) {
prev = params;
continue;
}
if (params->notify(conn, params, data, length) ==
BT_GATT_ITER_STOP) {
bt_gatt_unsubscribe(conn, params);
} else {
prev = params;
}
}
}
static void update_subscription(struct bt_conn *conn,
struct bt_gatt_subscribe_params *params)
{
if (params->_peer.type == BT_ADDR_LE_PUBLIC) {
return;
}
/* Update address */
bt_addr_le_copy(&params->_peer, &conn->le.dst);
}
static void gatt_subscription_remove(struct bt_conn *conn, sys_snode_t *prev,
struct bt_gatt_subscribe_params *params)
{
/* Remove subscription from the list*/
sys_slist_remove(&subscriptions, prev, &params->node);
params->notify(conn, params, NULL, 0);
}
static void remove_subscriptions(struct bt_conn *conn)
{
struct bt_gatt_subscribe_params *params, *tmp, *prev = NULL;
/* Lookup existing subscriptions */
SYS_SLIST_FOR_EACH_CONTAINER_SAFE(&subscriptions, params, tmp, node) {
if (bt_conn_addr_le_cmp(conn, &params->_peer)) {
prev = params;
continue;
}
if (!bt_addr_le_is_bonded(&conn->le.dst) ||
(params->flags & BT_GATT_SUBSCRIBE_FLAG_VOLATILE)) {
/* Remove subscription */
params->value = 0;
gatt_subscription_remove(conn, &prev->node, params);
} else {
update_subscription(conn, params);
prev = params;
}
}
}
static void gatt_mtu_rsp(struct bt_conn *conn, uint8_t err, const void *pdu,
uint16_t length, void *user_data)
{
struct bt_gatt_exchange_params *params = user_data;
params->func(conn, err, params);
}
int bt_gatt_exchange_mtu(struct bt_conn *conn,
struct bt_gatt_exchange_params *params)
{
struct bt_att_exchange_mtu_req *req;
struct net_buf *buf;
uint16_t mtu;
if (!conn || !params || !params->func) {
return -EINVAL;
}
if (conn->state != BT_CONN_CONNECTED) {
return -ENOTCONN;
}
buf = bt_att_create_pdu(conn, BT_ATT_OP_MTU_REQ, sizeof(*req));
if (!buf) {
return -ENOMEM;
}
mtu = BT_ATT_MTU;
BT_DBG("Client MTU %u", mtu);
req = net_buf_add(buf, sizeof(*req));
req->mtu = sys_cpu_to_le16(mtu);
return gatt_send(conn, buf, gatt_mtu_rsp, params, NULL);
}
static void gatt_discover_next(struct bt_conn *conn, uint16_t last_handle,
struct bt_gatt_discover_params *params)
{
/* Skip if last_handle is not set */
if (!last_handle)
goto discover;
/* Continue from the last found handle */
params->start_handle = last_handle;
if (params->start_handle < UINT16_MAX) {
params->start_handle++;
}
/* Stop if over the range or the requests */
if (params->start_handle >= params->end_handle) {
goto done;
}
discover:
/* Discover next range */
if (!bt_gatt_discover(conn, params)) {
return;
}
done:
params->func(conn, NULL, params);
}
static void gatt_find_type_rsp(struct bt_conn *conn, uint8_t err,
const void *pdu, uint16_t length,
void *user_data)
{
const struct bt_att_find_type_rsp *rsp = pdu;
struct bt_gatt_discover_params *params = user_data;
uint8_t i;
uint16_t end_handle = 0, start_handle;
BT_DBG("err 0x%02x", err);
if (err) {
goto done;
}
/* Parse attributes found */
for (i = 0; length >= sizeof(rsp->list[i]);
i++, length -= sizeof(rsp->list[i])) {
struct bt_gatt_attr attr = {};
struct bt_gatt_service value;
start_handle = sys_le16_to_cpu(rsp->list[i].start_handle);
end_handle = sys_le16_to_cpu(rsp->list[i].end_handle);
BT_DBG("start_handle 0x%04x end_handle 0x%04x", start_handle,
end_handle);
if (params->type == BT_GATT_DISCOVER_PRIMARY) {
attr.uuid = BT_UUID_GATT_PRIMARY;
} else {
attr.uuid = BT_UUID_GATT_SECONDARY;
}
value.end_handle = end_handle;
value.uuid = params->uuid;
attr.handle = start_handle;
attr.user_data = &value;
if (params->func(conn, &attr, params) == BT_GATT_ITER_STOP) {
return;
}
}
/* Stop if could not parse the whole PDU */
if (length > 0) {
goto done;
}
gatt_discover_next(conn, end_handle, params);
return;
done:
params->func(conn, NULL, params);
}
static int gatt_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:
net_buf_add_mem(buf, 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, gatt_find_type_rsp, params, NULL);
}
static void read_included_uuid_cb(struct bt_conn *conn, uint8_t err,
const void *pdu, uint16_t length,
void *user_data)
{
struct bt_gatt_discover_params *params = user_data;
struct bt_gatt_include value;
struct bt_gatt_attr *attr;
union {
struct bt_uuid uuid;
struct bt_uuid_128 u128;
} u;
if (length != 16) {
BT_ERR("Invalid data len %u", length);
params->func(conn, NULL, params);
return;
}
value.start_handle = params->_included.start_handle;
value.end_handle = params->_included.end_handle;
value.uuid = &u.uuid;
u.uuid.type = BT_UUID_TYPE_128;
memcpy(u.u128.val, pdu, length);
BT_DBG("handle 0x%04x uuid %s start_handle 0x%04x "
"end_handle 0x%04x\n", params->_included.attr_handle,
bt_uuid_str(&u.uuid), value.start_handle, value.end_handle);
/* Skip if UUID is set but doesn't match */
if (params->uuid && bt_uuid_cmp(&u.uuid, params->uuid)) {
goto next;
}
attr = (&(struct bt_gatt_attr) {
.uuid = BT_UUID_GATT_INCLUDE,
.user_data = &value, });
attr->handle = params->_included.attr_handle;
if (params->func(conn, attr, params) == BT_GATT_ITER_STOP) {
return;
}
next:
gatt_discover_next(conn, params->start_handle, params);
return;
}
static int read_included_uuid(struct bt_conn *conn,
struct bt_gatt_discover_params *params)
{
struct net_buf *buf;
struct bt_att_read_req *req;
buf = bt_att_create_pdu(conn, BT_ATT_OP_READ_REQ, sizeof(*req));
if (!buf) {
return -ENOMEM;
}
req = net_buf_add(buf, sizeof(*req));
req->handle = sys_cpu_to_le16(params->_included.start_handle);
BT_DBG("handle 0x%04x", params->_included.start_handle);
return gatt_send(conn, buf, read_included_uuid_cb, params, NULL);
}
static uint16_t parse_include(struct bt_conn *conn, const void *pdu,
struct bt_gatt_discover_params *params,
uint16_t length)
{
const struct bt_att_read_type_rsp *rsp = pdu;
uint16_t handle = 0;
struct bt_gatt_include value;
union {
struct bt_uuid uuid;
struct bt_uuid_16 u16;
struct bt_uuid_128 u128;
} u;
/* Data can be either in UUID16 or UUID128 */
switch (rsp->len) {
case 8: /* UUID16 */
u.uuid.type = BT_UUID_TYPE_16;
break;
case 6: /* UUID128 */
/* BLUETOOTH SPECIFICATION Version 4.2 [Vol 3, Part G] page 550
* To get the included service UUID when the included service
* uses a 128-bit UUID, the Read Request is used.
*/
u.uuid.type = BT_UUID_TYPE_128;
break;
default:
BT_ERR("Invalid data len %u", rsp->len);
goto done;
}
/* Parse include found */
for (length--, pdu = rsp->data; length >= rsp->len;
length -= rsp->len, pdu += rsp->len) {
struct bt_gatt_attr *attr;
const struct bt_att_data *data = pdu;
struct gatt_incl *incl = (void *)data->value;
handle = sys_le16_to_cpu(data->handle);
/* Handle 0 is invalid */
if (!handle) {
goto done;
}
/* Convert include data, bt_gatt_incl and gatt_incl
* have different formats so the conversion have to be done
* field by field.
*/
value.start_handle = sys_le16_to_cpu(incl->start_handle);
value.end_handle = sys_le16_to_cpu(incl->end_handle);
switch (u.uuid.type) {
case BT_UUID_TYPE_16:
value.uuid = &u.uuid;
u.u16.val = sys_le16_to_cpu(incl->uuid16);
break;
case BT_UUID_TYPE_128:
params->_included.attr_handle = handle;
params->_included.start_handle = value.start_handle;
params->_included.end_handle = value.end_handle;
return read_included_uuid(conn, params);
}
BT_DBG("handle 0x%04x uuid %s start_handle 0x%04x "
"end_handle 0x%04x\n", handle, bt_uuid_str(&u.uuid),
value.start_handle, value.end_handle);
/* Skip if UUID is set but doesn't match */
if (params->uuid && bt_uuid_cmp(&u.uuid, params->uuid)) {
continue;
}
attr = (&(struct bt_gatt_attr) {
.uuid = BT_UUID_GATT_INCLUDE,
.user_data = &value, });
attr->handle = handle;
if (params->func(conn, attr, params) == BT_GATT_ITER_STOP) {
return 0;
}
}
/* Whole PDU read without error */
if (length == 0 && handle) {
return handle;
}
done:
params->func(conn, NULL, params);
return 0;
}
static uint16_t parse_characteristic(struct bt_conn *conn, const void *pdu,
struct bt_gatt_discover_params *params,
uint16_t length)
{
const struct bt_att_read_type_rsp *rsp = pdu;
uint16_t handle = 0;
union {
struct bt_uuid uuid;
struct bt_uuid_16 u16;
struct bt_uuid_128 u128;
} u;
/* Data can be either in UUID16 or UUID128 */
switch (rsp->len) {
case 7: /* UUID16 */
u.uuid.type = BT_UUID_TYPE_16;
break;
case 21: /* UUID128 */
u.uuid.type = BT_UUID_TYPE_128;
break;
default:
BT_ERR("Invalid data len %u", rsp->len);
goto done;
}
/* Parse characteristics found */
for (length--, pdu = rsp->data; length >= rsp->len;
length -= rsp->len, pdu += rsp->len) {
struct bt_gatt_attr *attr;
const struct bt_att_data *data = pdu;
struct gatt_chrc *chrc = (void *)data->value;
handle = sys_le16_to_cpu(data->handle);
/* Handle 0 is invalid */
if (!handle) {
goto done;
}
switch (u.uuid.type) {
case BT_UUID_TYPE_16:
u.u16.val = sys_le16_to_cpu(chrc->uuid16);
break;
case BT_UUID_TYPE_128:
memcpy(u.u128.val, chrc->uuid, sizeof(chrc->uuid));
break;
}
BT_DBG("handle 0x%04x uuid %s properties 0x%02x", handle,
bt_uuid_str(&u.uuid), chrc->properties);
/* Skip if UUID is set but doesn't match */
if (params->uuid && bt_uuid_cmp(&u.uuid, params->uuid)) {
continue;
}
attr = (&(struct bt_gatt_attr)BT_GATT_CHARACTERISTIC(&u.uuid,
chrc->properties));
attr->handle = handle;
if (params->func(conn, attr, params) == BT_GATT_ITER_STOP) {
return 0;
}
}
/* Whole PDU read without error */
if (length == 0 && handle) {
return handle;
}
done:
params->func(conn, NULL, params);
return 0;
}
static void gatt_read_type_rsp(struct bt_conn *conn, uint8_t err,
const void *pdu, uint16_t length,
void *user_data)
{
struct bt_gatt_discover_params *params = user_data;
uint16_t handle;
BT_DBG("err 0x%02x", err);
if (err) {
params->func(conn, NULL, params);
return;
}
if (params->type == BT_GATT_DISCOVER_INCLUDE) {
handle = parse_include(conn, pdu, params, length);
} else {
handle = parse_characteristic(conn, pdu, params, length);
}
if (!handle) {
return;
}
gatt_discover_next(conn, handle, params);
}
static int gatt_read_type(struct bt_conn *conn,
struct bt_gatt_discover_params *params)
{
struct net_buf *buf;
struct bt_att_read_type_req *req;
buf = bt_att_create_pdu(conn, BT_ATT_OP_READ_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_INCLUDE) {
net_buf_add_le16(buf, BT_UUID_GATT_INCLUDE_VAL);
} else {
net_buf_add_le16(buf, BT_UUID_GATT_CHRC_VAL);
}
BT_DBG("start_handle 0x%04x end_handle 0x%04x", params->start_handle,
params->end_handle);
return gatt_send(conn, buf, gatt_read_type_rsp, params, NULL);
}
static void gatt_find_info_rsp(struct bt_conn *conn, uint8_t err,
const void *pdu, uint16_t length,
void *user_data)
{
const struct bt_att_find_info_rsp *rsp = pdu;
struct bt_gatt_discover_params *params = user_data;
uint16_t handle = 0;
uint8_t len;
union {
const struct bt_att_info_16 *i16;
const struct bt_att_info_128 *i128;
} info;
union {
struct bt_uuid uuid;
struct bt_uuid_16 u16;
struct bt_uuid_128 u128;
} u;
BT_DBG("err 0x%02x", err);
if (err) {
goto done;
}
/* Data can be either in UUID16 or UUID128 */
switch (rsp->format) {
case BT_ATT_INFO_16:
u.uuid.type = BT_UUID_TYPE_16;
len = sizeof(*info.i16);
break;
case BT_ATT_INFO_128:
u.uuid.type = BT_UUID_TYPE_128;
len = sizeof(*info.i128);
break;
default:
BT_ERR("Invalid format %u", rsp->format);
goto done;
}
/* Parse descriptors found */
for (length--, pdu = rsp->info; length >= len;
length -= len, pdu += len) {
struct bt_gatt_attr *attr;
info.i16 = pdu;
handle = sys_le16_to_cpu(info.i16->handle);
switch (u.uuid.type) {
case BT_UUID_TYPE_16:
u.u16.val = sys_le16_to_cpu(info.i16->uuid);
break;
case BT_UUID_TYPE_128:
memcpy(u.u128.val, info.i128->uuid, 16);
break;
}
BT_DBG("handle 0x%04x uuid %s", handle, bt_uuid_str(&u.uuid));
/* Skip if UUID is set but doesn't match */
if (params->uuid && bt_uuid_cmp(&u.uuid, params->uuid)) {
continue;
}
attr = (&(struct bt_gatt_attr)
BT_GATT_DESCRIPTOR(&u.uuid, 0, NULL, NULL, NULL));
attr->handle = handle;
if (params->func(conn, attr, params) == BT_GATT_ITER_STOP) {
return;
}
}
/* Stop if could not parse the whole PDU */
if (length > 0) {
goto done;
}
gatt_discover_next(conn, handle, params);
return;
done:
params->func(conn, NULL, params);
}
static int gatt_find_info(struct bt_conn *conn,
struct bt_gatt_discover_params *params)
{
struct net_buf *buf;
struct bt_att_find_info_req *req;
buf = bt_att_create_pdu(conn, BT_ATT_OP_FIND_INFO_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);
BT_DBG("start_handle 0x%04x end_handle 0x%04x", params->start_handle,
params->end_handle);
return gatt_send(conn, buf, gatt_find_info_rsp, params, NULL);
}
int bt_gatt_discover(struct bt_conn *conn,
struct bt_gatt_discover_params *params)
{
if (!conn || !params || !params->func || !params->start_handle ||
!params->end_handle || params->start_handle > params->end_handle) {
return -EINVAL;
}
if (conn->state != BT_CONN_CONNECTED) {
return -ENOTCONN;
}
switch (params->type) {
case BT_GATT_DISCOVER_PRIMARY:
case BT_GATT_DISCOVER_SECONDARY:
return gatt_find_type(conn, params);
case BT_GATT_DISCOVER_INCLUDE:
case BT_GATT_DISCOVER_CHARACTERISTIC:
return gatt_read_type(conn, params);
case BT_GATT_DISCOVER_DESCRIPTOR:
return gatt_find_info(conn, params);
default:
BT_ERR("Invalid discovery type: %u", params->type);
}
return -EINVAL;
}
static void gatt_read_rsp(struct bt_conn *conn, uint8_t err, const void *pdu,
uint16_t length, void *user_data)
{
struct bt_gatt_read_params *params = user_data;
BT_DBG("err 0x%02x", err);
if (err || !length) {
params->func(conn, err, params, NULL, 0);
return;
}
if (params->func(conn, 0, params, pdu, length) == BT_GATT_ITER_STOP) {
return;
}
/*
* Core Spec 4.2, Vol. 3, Part G, 4.8.1
* If the Characteristic Value is greater than (ATT_MTU - 1) octets
* in length, the Read Long Characteristic Value procedure may be used
* if the rest of the Characteristic Value is required.
*/
if (length < (bt_att_get_mtu(conn) - 1)) {
params->func(conn, 0, params, NULL, 0);
return;
}
params->single.offset += length;
/* Continue reading the attribute */
if (bt_gatt_read(conn, params) < 0) {
params->func(conn, BT_ATT_ERR_UNLIKELY, params, NULL, 0);
}
}
static int gatt_read_blob(struct bt_conn *conn,
struct bt_gatt_read_params *params)
{
struct net_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 = net_buf_add(buf, sizeof(*req));
req->handle = sys_cpu_to_le16(params->single.handle);
req->offset = sys_cpu_to_le16(params->single.offset);
BT_DBG("handle 0x%04x offset 0x%04x", params->single.handle,
params->single.offset);
return gatt_send(conn, buf, gatt_read_rsp, params, NULL);
}
static void gatt_read_multiple_rsp(struct bt_conn *conn, uint8_t err,
const void *pdu, uint16_t length,
void *user_data)
{
struct bt_gatt_read_params *params = user_data;
BT_DBG("err 0x%02x", err);
if (err || !length) {
params->func(conn, err, params, NULL, 0);
return;
}
params->func(conn, 0, params, pdu, length);
/* mark read as complete since read multiple is single response */
params->func(conn, 0, params, NULL, 0);
}
static int gatt_read_multiple(struct bt_conn *conn,
struct bt_gatt_read_params *params)
{
struct net_buf *buf;
uint8_t i;
buf = bt_att_create_pdu(conn, BT_ATT_OP_READ_MULT_REQ,
params->handle_count * sizeof(uint16_t));
if (!buf) {
return -ENOMEM;
}
for (i = 0; i < params->handle_count; i++) {
net_buf_add_le16(buf, params->handles[i]);
}
return gatt_send(conn, buf, gatt_read_multiple_rsp, params, NULL);
}
int bt_gatt_read(struct bt_conn *conn, struct bt_gatt_read_params *params)
{
struct net_buf *buf;
struct bt_att_read_req *req;
if (!conn || !params || !params->handle_count || !params->func) {
return -EINVAL;
}
if (conn->state != BT_CONN_CONNECTED) {
return -ENOTCONN;
}
if (params->handle_count > 1) {
return gatt_read_multiple(conn, params);
}
if (params->single.offset) {
return gatt_read_blob(conn, params);
}
buf = bt_att_create_pdu(conn, BT_ATT_OP_READ_REQ, sizeof(*req));
if (!buf) {
return -ENOMEM;
}
req = net_buf_add(buf, sizeof(*req));
req->handle = sys_cpu_to_le16(params->single.handle);
BT_DBG("handle 0x%04x", params->single.handle);
return gatt_send(conn, buf, gatt_read_rsp, params, NULL);
}
static void gatt_write_rsp(struct bt_conn *conn, uint8_t err, const void *pdu,
uint16_t length, void *user_data)
{
struct bt_gatt_write_params *params = user_data;
BT_DBG("err 0x%02x", err);
params->func(conn, err, params);
}
static bool write_signed_allowed(struct bt_conn *conn)
{
#if defined(CONFIG_BLUETOOTH_SMP)
return conn->encrypt == 0;
#else
return false;
#endif /* CONFIG_BLUETOOTH_SMP */
}
int bt_gatt_write_without_response(struct bt_conn *conn, uint16_t handle,
const void *data, uint16_t length, bool sign)
{
struct net_buf *buf;
struct bt_att_write_cmd *cmd;
if (!conn || !handle) {
return -EINVAL;
}
if (conn->state != BT_CONN_CONNECTED) {
return -ENOTCONN;
}
if (sign && write_signed_allowed(conn)) {
buf = bt_att_create_pdu(conn, BT_ATT_OP_SIGNED_WRITE_CMD,
sizeof(*cmd) + length + 12);
} else {
buf = bt_att_create_pdu(conn, BT_ATT_OP_WRITE_CMD,
sizeof(*cmd) + length);
}
if (!buf) {
return -ENOMEM;
}
cmd = net_buf_add(buf, sizeof(*cmd));
cmd->handle = sys_cpu_to_le16(handle);
memcpy(cmd->value, data, length);
net_buf_add(buf, length);
BT_DBG("handle 0x%04x length %u", handle, length);
return gatt_send(conn, buf, NULL, NULL, NULL);
}
static int gatt_exec_write(struct bt_conn *conn,
struct bt_gatt_write_params *params)
{
struct net_buf *buf;
struct bt_att_exec_write_req *req;
buf = bt_att_create_pdu(conn, BT_ATT_OP_EXEC_WRITE_REQ, sizeof(*req));
if (!buf) {
return -ENOMEM;
}
req = net_buf_add(buf, sizeof(*req));
req->flags = BT_ATT_FLAG_EXEC;
BT_DBG("");
return gatt_send(conn, buf, gatt_write_rsp, params, NULL);
}
static void gatt_prepare_write_rsp(struct bt_conn *conn, uint8_t err,
const void *pdu, uint16_t length,
void *user_data)
{
struct bt_gatt_write_params *params = user_data;
BT_DBG("err 0x%02x", err);
/* Don't continue in case of error */
if (err) {
params->func(conn, err, params);
return;
}
/* If there is no more data execute */
if (!params->length) {
gatt_exec_write(conn, params);
return;
}
/* Write next chunk */
bt_gatt_write(conn, params);
}
static int gatt_prepare_write(struct bt_conn *conn,
struct bt_gatt_write_params *params)
{
struct net_buf *buf;
struct bt_att_prepare_write_req *req;
uint16_t len;
len = min(params->length, bt_att_get_mtu(conn) - sizeof(*req) - 1);
buf = bt_att_create_pdu(conn, BT_ATT_OP_PREPARE_WRITE_REQ,
sizeof(*req) + len);
if (!buf) {
return -ENOMEM;
}
req = net_buf_add(buf, sizeof(*req));
req->handle = sys_cpu_to_le16(params->handle);
req->offset = sys_cpu_to_le16(params->offset);
memcpy(req->value, params->data, len);
net_buf_add(buf, len);
/* Update params */
params->offset += len;
params->data += len;
params->length -= len;
BT_DBG("handle 0x%04x offset %u len %u", params->handle, params->offset,
params->length);
return gatt_send(conn, buf, gatt_prepare_write_rsp, params, NULL);
}
int bt_gatt_write(struct bt_conn *conn, struct bt_gatt_write_params *params)
{
struct net_buf *buf;
struct bt_att_write_req *req;
if (!conn || !params || !params->handle || !params->func) {
return -EINVAL;
}
if (conn->state != BT_CONN_CONNECTED) {
return -ENOTCONN;
}
/* Use Prepare Write if offset is set or Long Write is required */
if (params->offset ||
params->length > (bt_att_get_mtu(conn) - sizeof(*req) - 1)) {
return gatt_prepare_write(conn, params);
}
buf = bt_att_create_pdu(conn, BT_ATT_OP_WRITE_REQ,
sizeof(*req) + params->length);
if (!buf) {
return -ENOMEM;
}
req = net_buf_add(buf, sizeof(*req));
req->handle = sys_cpu_to_le16(params->handle);
memcpy(req->value, params->data, params->length);
net_buf_add(buf, params->length);
BT_DBG("handle 0x%04x length %u", params->handle, params->length);
return gatt_send(conn, buf, gatt_write_rsp, params, NULL);
}
static void gatt_subscription_add(struct bt_conn *conn,
struct bt_gatt_subscribe_params *params)
{
bt_addr_le_copy(&params->_peer, &conn->le.dst);
/* Prepend subscription */
sys_slist_prepend(&subscriptions, &params->node);
}
static void gatt_write_ccc_rsp(struct bt_conn *conn, uint8_t err,
const void *pdu, uint16_t length,
void *user_data)
{
struct bt_gatt_subscribe_params *params = user_data;
BT_DBG("err 0x%02x", err);
/* if write to CCC failed we remove subscription and notify app */
if (err) {
sys_snode_t *node, *tmp, *prev = NULL;
SYS_SLIST_FOR_EACH_NODE_SAFE(&subscriptions, node, tmp) {
if (node == &params->node) {
gatt_subscription_remove(conn, tmp, params);
break;
}
prev = node;
}
}
}
static int gatt_write_ccc(struct bt_conn *conn, uint16_t handle, uint16_t value,
bt_att_func_t func,
struct bt_gatt_subscribe_params *params)
{
struct net_buf *buf;
struct bt_att_write_req *req;
buf = bt_att_create_pdu(conn, BT_ATT_OP_WRITE_REQ,
sizeof(*req) + sizeof(uint16_t));
if (!buf) {
return -ENOMEM;
}
req = net_buf_add(buf, sizeof(*req));
req->handle = sys_cpu_to_le16(handle);
net_buf_add_le16(buf, value);
BT_DBG("handle 0x%04x value 0x%04x", handle, value);
return gatt_send(conn, buf, func, params, NULL);
}
int bt_gatt_subscribe(struct bt_conn *conn,
struct bt_gatt_subscribe_params *params)
{
struct bt_gatt_subscribe_params *tmp;
bool has_subscription = false;
if (!conn || !params || !params->notify ||
!params->value || !params->ccc_handle) {
return -EINVAL;
}
if (conn->state != BT_CONN_CONNECTED) {
return -ENOTCONN;
}
/* Lookup existing subscriptions */
SYS_SLIST_FOR_EACH_CONTAINER(&subscriptions, tmp, node) {
/* Fail if entry already exists */
if (tmp == params) {
return -EALREADY;
}
/* Check if another subscription exists */
if (!bt_conn_addr_le_cmp(conn, &tmp->_peer) &&
tmp->value_handle == params->value_handle &&
tmp->value >= params->value) {
has_subscription = true;
}
}
/* Skip write if already subscribed */
if (!has_subscription) {
int err;
err = gatt_write_ccc(conn, params->ccc_handle, params->value,
gatt_write_ccc_rsp, NULL);
if (err) {
return err;
}
}
/*
* Add subscription before write complete as some implementation were
* reported to send notification before reply to CCC write.
*/
gatt_subscription_add(conn, params);
return 0;
}
int bt_gatt_unsubscribe(struct bt_conn *conn,
struct bt_gatt_subscribe_params *params)
{
struct bt_gatt_subscribe_params *tmp, *next, *prev = NULL;
bool has_subscription = false, found = false;
if (!conn || !params) {
return -EINVAL;
}
if (conn->state != BT_CONN_CONNECTED) {
return -ENOTCONN;
}
/* Lookup existing subscriptions */
SYS_SLIST_FOR_EACH_CONTAINER_SAFE(&subscriptions, tmp, next, node) {
/* Remove subscription */
if (params == tmp) {
found = true;
sys_slist_remove(&subscriptions, &prev->node,
&tmp->node);
continue;
} else {
prev = tmp;
}
/* Check if there still remains any other subscription */
if (!bt_conn_addr_le_cmp(conn, &tmp->_peer) &&
tmp->value_handle == params->value_handle) {
has_subscription = true;
}
}
if (!found) {
return -EINVAL;
}
if (has_subscription) {
return 0;
}
return gatt_write_ccc(conn, params->ccc_handle, 0x0000, NULL, NULL);
}
void bt_gatt_cancel(struct bt_conn *conn, void *params)
{
bt_att_req_cancel(conn, params);
}
static void add_subscriptions(struct bt_conn *conn)
{
struct bt_gatt_subscribe_params *params;
/* Lookup existing subscriptions */
SYS_SLIST_FOR_EACH_CONTAINER(&subscriptions, params, node) {
if (bt_conn_addr_le_cmp(conn, &params->_peer)) {
continue;
}
/* Force write to CCC to workaround devices that don't track
* it properly.
*/
gatt_write_ccc(conn, params->ccc_handle, params->value,
NULL, NULL);
}
}
#endif /* CONFIG_BLUETOOTH_GATT_CLIENT */
void bt_gatt_connected(struct bt_conn *conn)
{
BT_DBG("conn %p", conn);
bt_gatt_foreach_attr(0x0001, 0xffff, connected_cb, conn);
#if defined(CONFIG_BLUETOOTH_GATT_CLIENT)
add_subscriptions(conn);
#endif /* CONFIG_BLUETOOTH_GATT_CLIENT */
}
void bt_gatt_disconnected(struct bt_conn *conn)
{
BT_DBG("conn %p", conn);
bt_gatt_foreach_attr(0x0001, 0xffff, disconnected_cb, conn);
#if defined(CONFIG_BLUETOOTH_GATT_CLIENT)
remove_subscriptions(conn);
#endif /* CONFIG_BLUETOOTH_GATT_CLIENT */
}