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gatt-client.c
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/**
* @file gatt-client.c
* @brief gatt client protocol core functions
* @author Gilbert Brault
* @copyright Gilbert Brault 2015
* the original work comes from bluez v5.39
* value add: documenting main features
*
*/
/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2014 Google Inc.
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "att.h"
#include "bluetooth.h"
#include "uuid.h"
#include "gatt-helpers.h"
#include "util.h"
#include "queue.h"
#include "gatt-db.h"
#include "gatt-client.h"
#include <assert.h>
#include <limits.h>
#include <sys/uio.h>
#ifndef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
#define UUID_BYTES (BT_GATT_UUID_SIZE * sizeof(uint8_t))
#define GATT_SVC_UUID 0x1801
#define SVC_CHNGD_UUID 0x2a05
/**
* @brief bluetooth GATT client structure
*
* main data structure to manage the GATT client state
*/
struct bt_gatt_client {
struct bt_att *att;
/**< ATT client structure pointer */
int ref_count;
/**< count of references */
bt_gatt_client_callback_t ready_callback;
bt_gatt_client_destroy_func_t ready_destroy;
void *ready_data;
bt_gatt_client_service_changed_callback_t svc_chngd_callback;
bt_gatt_client_destroy_func_t svc_chngd_destroy;
void *svc_chngd_data;
bt_gatt_client_debug_func_t debug_callback;
bt_gatt_client_destroy_func_t debug_destroy;
void *debug_data;
struct gatt_db *db;
bool in_init;
bool ready;
struct queue *long_write_queue;
/**< Queue of long write requests. An error during "prepare write"
* requests can result in a cancel through "execute write". To prevent
* cancellation of prepared writes to the wrong attribute and multiple
* requests to the same attribute that may result in a corrupted final
* value, we avoid interleaving prepared writes.
*/
bool in_long_write;
unsigned int reliable_write_session_id;
struct queue *notify_list;
/**< List of registered disconnect/notification/indication callbacks */
struct queue *notify_chrcs;
int next_reg_id;
unsigned int disc_id;
/**< Handle of the GATT Service
* 0 if not present on the remote peripheral.
*/
unsigned int notify_id;
/**<
* Handle of the GATT Service Changed characteristic
* 0 if not present on the remote peripheral.
*/
unsigned int ind_id;
/**<
* Handles of the GATT indication.
* 0 if not present on the remote peripheral.
*/
unsigned int svc_chngd_ind_id;
bool svc_chngd_registered;
struct queue *svc_chngd_queue;
/**< Queued service changed events */
bool in_svc_chngd;
struct queue *pending_requests;
/**< List of pending read/write operations. For operations that span
* across multiple PDUs, this list provides a mapping from an operation
* id to an ATT request id.
*/
unsigned int next_request_id;
struct bt_gatt_request *discovery_req;
unsigned int mtu_req_id;
};
/**
* @brief Request data structure
*
* Structure to manage request queries
*/
struct request {
struct bt_gatt_client *client;
/**< GATT client context */
bool long_write;
/**< true if the request is a long write */
bool prep_write;
/**< true if the request is a preparation write request */
bool removed;
/**< request still in queue if true */
int ref_count;
/**< number of references to this data structure */
unsigned int id;
/**< request id: a unique number incremented by each client request */
unsigned int att_id;
/**< att message sequence number */
void *data;
/**< reference to the data exchanged during the request */
void (*destroy)(void *);
/**< function called when data structure need to be released (ref_count reaches 0) */
};
static struct request *request_ref(struct request *req)
{
__sync_fetch_and_add(&req->ref_count, 1);
return req;
}
static struct request *request_create(struct bt_gatt_client *client)
{
struct request *req;
req = new0(struct request, 1);
if (!req)
return NULL;
if (client->next_request_id < 1)
client->next_request_id = 1;
queue_push_tail(client->pending_requests, req);
req->client = client;
req->id = client->next_request_id++;
return request_ref(req);
}
static void request_unref(void *data)
{
struct request *req = data;
if (__sync_sub_and_fetch(&req->ref_count, 1))
return;
if (req->destroy)
req->destroy(req->data);
if (!req->removed)
queue_remove(req->client->pending_requests, req);
free(req);
}
struct notify_chrc {
uint16_t value_handle;
uint16_t ccc_handle;
uint16_t properties;
int notify_count; /* Reference count of registered notify callbacks */
/* Pending calls to register_notify are queued here so that they can be
* processed after a write that modifies the CCC descriptor.
*/
struct queue *reg_notify_queue;
unsigned int ccc_write_id;
};
struct notify_data {
struct bt_gatt_client *client;
unsigned int id;
unsigned int att_id;
int ref_count;
struct notify_chrc *chrc;
bt_gatt_client_register_callback_t callback;
bt_gatt_client_notify_callback_t notify;
void *user_data;
bt_gatt_client_destroy_func_t destroy;
};
static struct notify_data *notify_data_ref(struct notify_data *notify_data)
{
__sync_fetch_and_add(¬ify_data->ref_count, 1);
return notify_data;
}
static void notify_data_unref(void *data)
{
struct notify_data *notify_data = data;
if (__sync_sub_and_fetch(¬ify_data->ref_count, 1))
return;
if (notify_data->destroy)
notify_data->destroy(notify_data->user_data);
free(notify_data);
}
static void find_ccc(struct gatt_db_attribute *attr, void *user_data)
{
struct gatt_db_attribute **ccc_ptr = user_data;
bt_uuid_t uuid;
if (*ccc_ptr)
return;
bt_uuid16_create(&uuid, GATT_CLIENT_CHARAC_CFG_UUID);
if (bt_uuid_cmp(&uuid, gatt_db_attribute_get_type(attr)))
return;
*ccc_ptr = attr;
}
static struct notify_chrc *notify_chrc_create(struct bt_gatt_client *client,
uint16_t value_handle)
{
struct gatt_db_attribute *attr, *ccc;
struct notify_chrc *chrc;
bt_uuid_t uuid;
uint8_t properties;
/* Check that chrc_value_handle belongs to a known characteristic */
attr = gatt_db_get_attribute(client->db, value_handle - 1);
if (!attr)
return NULL;
bt_uuid16_create(&uuid, GATT_CHARAC_UUID);
if (bt_uuid_cmp(&uuid, gatt_db_attribute_get_type(attr)))
return NULL;
if (!gatt_db_attribute_get_char_data(attr, NULL, NULL,
&properties, NULL))
return NULL;
chrc = new0(struct notify_chrc, 1);
if (!chrc)
return NULL;
chrc->reg_notify_queue = queue_new();
if (!chrc->reg_notify_queue) {
free(chrc);
return NULL;
}
/*
* Find the CCC characteristic. Some characteristics that allow
* notifications may not have a CCC descriptor. We treat these as
* automatically successful.
*/
ccc = NULL;
gatt_db_service_foreach_desc(attr, find_ccc, &ccc);
if (ccc)
chrc->ccc_handle = gatt_db_attribute_get_handle(ccc);
chrc->value_handle = value_handle;
chrc->properties = properties;
queue_push_tail(client->notify_chrcs, chrc);
return chrc;
}
static void notify_chrc_free(void *data)
{
struct notify_chrc *chrc = data;
queue_destroy(chrc->reg_notify_queue, notify_data_unref);
free(chrc);
}
static bool match_notify_data_id(const void *a, const void *b)
{
const struct notify_data *notify_data = a;
unsigned int id = PTR_TO_UINT(b);
return notify_data->id == id;
}
struct handle_range {
uint16_t start;
uint16_t end;
};
static bool match_notify_data_handle_range(const void *a, const void *b)
{
const struct notify_data *notify_data = a;
struct notify_chrc *chrc = notify_data->chrc;
const struct handle_range *range = b;
return chrc->value_handle >= range->start &&
chrc->value_handle <= range->end;
}
static bool match_notify_chrc_handle_range(const void *a, const void *b)
{
const struct notify_chrc *chrc = a;
const struct handle_range *range = b;
return chrc->value_handle >= range->start &&
chrc->value_handle <= range->end;
}
static void gatt_client_remove_all_notify_in_range(
struct bt_gatt_client *client,
uint16_t start_handle, uint16_t end_handle)
{
struct handle_range range;
range.start = start_handle;
range.end = end_handle;
queue_remove_all(client->notify_list, match_notify_data_handle_range,
&range, notify_data_unref);
}
static void gatt_client_remove_notify_chrcs_in_range(
struct bt_gatt_client *client,
uint16_t start_handle, uint16_t end_handle)
{
struct handle_range range;
range.start = start_handle;
range.end = end_handle;
queue_remove_all(client->notify_chrcs, match_notify_chrc_handle_range,
&range, notify_chrc_free);
}
struct discovery_op;
typedef void (*discovery_op_complete_func_t)(struct discovery_op *op,
bool success,
uint8_t att_ecode);
typedef void (*discovery_op_fail_func_t)(struct discovery_op *op);
struct discovery_op {
struct bt_gatt_client *client;
struct queue *pending_svcs;
struct queue *pending_chrcs;
struct queue *tmp_queue;
struct gatt_db_attribute *cur_svc;
bool success;
uint16_t start;
uint16_t end;
int ref_count;
discovery_op_complete_func_t complete_func;
discovery_op_fail_func_t failure_func;
};
static void discovery_op_free(struct discovery_op *op)
{
queue_destroy(op->pending_svcs, NULL);
queue_destroy(op->pending_chrcs, free);
queue_destroy(op->tmp_queue, NULL);
free(op);
}
static struct discovery_op *discovery_op_create(struct bt_gatt_client *client,
uint16_t start, uint16_t end,
discovery_op_complete_func_t complete_func,
discovery_op_fail_func_t failure_func)
{
struct discovery_op *op;
op = new0(struct discovery_op, 1);
if (!op)
return NULL;
op->pending_svcs = queue_new();
if (!op->pending_svcs)
goto fail;
op->pending_chrcs = queue_new();
if (!op->pending_chrcs)
goto fail;
op->tmp_queue = queue_new();
if (!op->tmp_queue)
goto fail;
op->client = client;
op->complete_func = complete_func;
op->failure_func = failure_func;
op->start = start;
op->end = end;
return op;
fail:
discovery_op_free(op);
return NULL;
}
static struct discovery_op *discovery_op_ref(struct discovery_op *op)
{
__sync_fetch_and_add(&op->ref_count, 1);
return op;
}
static void discovery_op_unref(void *data)
{
struct discovery_op *op = data;
if (__sync_sub_and_fetch(&op->ref_count, 1))
return;
if (!op->success)
op->failure_func(op);
discovery_op_free(op);
}
static void discovery_req_clear(struct bt_gatt_client *client)
{
if (!client->discovery_req)
return;
bt_gatt_request_unref(client->discovery_req);
client->discovery_req = NULL;
}
static void discover_chrcs_cb(bool success, uint8_t att_ecode,
struct bt_gatt_result *result,
void *user_data);
static void discover_incl_cb(bool success, uint8_t att_ecode,
struct bt_gatt_result *result, void *user_data)
{
struct discovery_op *op = user_data;
struct bt_gatt_client *client = op->client;
struct bt_gatt_iter iter;
struct gatt_db_attribute *attr, *tmp;
uint16_t handle, start, end;
uint128_t u128;
bt_uuid_t uuid;
char uuid_str[MAX_LEN_UUID_STR];
unsigned int includes_count, i;
discovery_req_clear(client);
if (!success) {
if (att_ecode == BT_ATT_ERROR_ATTRIBUTE_NOT_FOUND)
goto next;
goto failed;
}
/* Get the currently processed service */
attr = op->cur_svc;
if (!attr)
goto failed;
if (!result || !bt_gatt_iter_init(&iter, result))
goto failed;
includes_count = bt_gatt_result_included_count(result);
if (includes_count == 0)
goto failed;
util_debug(client->debug_callback, client->debug_data,
"Included services found: %u",
includes_count);
for (i = 0; i < includes_count; i++) {
if (!bt_gatt_iter_next_included_service(&iter, &handle, &start,
&end, u128.data))
break;
bt_uuid128_create(&uuid, u128);
/* Log debug message */
bt_uuid_to_string(&uuid, uuid_str, sizeof(uuid_str));
util_debug(client->debug_callback, client->debug_data,
"handle: 0x%04x, start: 0x%04x, end: 0x%04x,"
"uuid: %s", handle, start, end, uuid_str);
tmp = gatt_db_get_attribute(client->db, start);
if (!tmp)
goto failed;
tmp = gatt_db_service_add_included(attr, tmp);
if (!tmp)
goto failed;
/*
* GATT requires that all include definitions precede
* characteristic declarations. Based on the order we're adding
* these entries, the correct handle must be assigned to the new
* attribute.
*/
if (gatt_db_attribute_get_handle(tmp) != handle)
goto failed;
}
next:
/* Move on to the next service */
attr = queue_pop_head(op->pending_svcs);
if (!attr) {
struct queue *tmp_queue;
tmp_queue = op->pending_svcs;
op->pending_svcs = op->tmp_queue;
op->tmp_queue = tmp_queue;
/*
* We have processed all include definitions. Move on to
* characteristics.
*/
attr = queue_pop_head(op->pending_svcs);
if (!attr)
goto failed;
if (!gatt_db_attribute_get_service_handles(attr, &start, &end))
goto failed;
op->cur_svc = attr;
client->discovery_req = bt_gatt_discover_characteristics(
client->att,
start, end,
discover_chrcs_cb,
discovery_op_ref(op),
discovery_op_unref);
if (client->discovery_req)
return;
util_debug(client->debug_callback, client->debug_data,
"Failed to start characteristic discovery");
discovery_op_unref(op);
goto failed;
}
queue_push_tail(op->tmp_queue, attr);
op->cur_svc = attr;
if (!gatt_db_attribute_get_service_handles(attr, &start, &end))
goto failed;
if (start == end)
goto next;
client->discovery_req = bt_gatt_discover_included_services(client->att,
start, end,
discover_incl_cb,
discovery_op_ref(op),
discovery_op_unref);
if (client->discovery_req)
return;
util_debug(client->debug_callback, client->debug_data,
"Failed to start included discovery");
discovery_op_unref(op);
failed:
op->success = false;
op->complete_func(op, false, att_ecode);
}
struct chrc {
uint16_t start_handle;
uint16_t end_handle;
uint16_t value_handle;
uint8_t properties;
bt_uuid_t uuid;
};
static void discover_descs_cb(bool success, uint8_t att_ecode,
struct bt_gatt_result *result,
void *user_data);
static bool discover_descs(struct discovery_op *op, bool *discovering)
{
struct bt_gatt_client *client = op->client;
struct gatt_db_attribute *attr;
struct chrc *chrc_data;
uint16_t desc_start;
*discovering = false;
while ((chrc_data = queue_pop_head(op->pending_chrcs))) {
attr = gatt_db_service_insert_characteristic(op->cur_svc,
chrc_data->value_handle,
&chrc_data->uuid, 0,
chrc_data->properties,
NULL, NULL, NULL);
if (!attr)
goto failed;
if (gatt_db_attribute_get_handle(attr) !=
chrc_data->value_handle)
goto failed;
/*
* check for descriptors presence, before initializing the
* desc_handle and avoid integer overflow during desc_handle
* intialization.
*/
if (chrc_data->value_handle >= chrc_data->end_handle) {
free(chrc_data);
continue;
}
desc_start = chrc_data->value_handle + 1;
client->discovery_req = bt_gatt_discover_descriptors(
client->att, desc_start,
chrc_data->end_handle,
discover_descs_cb,
discovery_op_ref(op),
discovery_op_unref);
if (client->discovery_req) {
*discovering = true;
goto done;
}
util_debug(client->debug_callback, client->debug_data,
"Failed to start descriptor discovery");
discovery_op_unref(op);
goto failed;
}
done:
free(chrc_data);
return true;
failed:
free(chrc_data);
return false;
}
static void discover_descs_cb(bool success, uint8_t att_ecode,
struct bt_gatt_result *result,
void *user_data)
{
struct discovery_op *op = user_data;
struct bt_gatt_client *client = op->client;
struct bt_gatt_iter iter;
struct gatt_db_attribute *attr;
uint16_t handle, start, end;
uint128_t u128;
bt_uuid_t uuid;
char uuid_str[MAX_LEN_UUID_STR];
unsigned int desc_count;
bool discovering;
discovery_req_clear(client);
if (!success) {
if (att_ecode == BT_ATT_ERROR_ATTRIBUTE_NOT_FOUND) {
success = true;
goto next;
}
goto done;
}
if (!result || !bt_gatt_iter_init(&iter, result))
goto failed;
desc_count = bt_gatt_result_descriptor_count(result);
if (desc_count == 0)
goto failed;
util_debug(client->debug_callback, client->debug_data,
"Descriptors found: %u", desc_count);
while (bt_gatt_iter_next_descriptor(&iter, &handle, u128.data)) {
bt_uuid128_create(&uuid, u128);
/* Log debug message */
bt_uuid_to_string(&uuid, uuid_str, sizeof(uuid_str));
util_debug(client->debug_callback, client->debug_data,
"handle: 0x%04x, uuid: %s",
handle, uuid_str);
attr = gatt_db_service_insert_descriptor(op->cur_svc, handle,
&uuid, 0, NULL, NULL,
NULL);
if (!attr)
goto failed;
if (gatt_db_attribute_get_handle(attr) != handle)
goto failed;
}
next:
if (!discover_descs(op, &discovering))
goto failed;
if (discovering)
return;
/* Done with the current service */
gatt_db_service_set_active(op->cur_svc, true);
attr = queue_pop_head(op->pending_svcs);
if (!attr)
goto done;
if (!gatt_db_attribute_get_service_handles(attr, &start, &end))
goto failed;
if (start == end)
goto next;
/* Move on to the next service */
op->cur_svc = attr;
client->discovery_req = bt_gatt_discover_characteristics(client->att,
start, end,
discover_chrcs_cb,
discovery_op_ref(op),
discovery_op_unref);
if (client->discovery_req)
return;
util_debug(client->debug_callback, client->debug_data,
"Failed to start characteristic discovery");
discovery_op_unref(op);
failed:
success = false;
done:
op->success = success;
op->complete_func(op, success, att_ecode);
}
static void discover_chrcs_cb(bool success, uint8_t att_ecode,
struct bt_gatt_result *result,
void *user_data)
{
struct discovery_op *op = user_data;
struct bt_gatt_client *client = op->client;
struct bt_gatt_iter iter;
struct gatt_db_attribute *attr;
struct chrc *chrc_data;
uint16_t start, end, value;
uint8_t properties;
uint128_t u128;
bt_uuid_t uuid;
char uuid_str[MAX_LEN_UUID_STR];
unsigned int chrc_count;
bool discovering;
discovery_req_clear(client);
if (!success) {
if (att_ecode == BT_ATT_ERROR_ATTRIBUTE_NOT_FOUND) {
success = true;
goto next;
}
goto done;
}
if (!op->cur_svc || !result || !bt_gatt_iter_init(&iter, result))
goto failed;
chrc_count = bt_gatt_result_characteristic_count(result);
util_debug(client->debug_callback, client->debug_data,
"Characteristics found: %u", chrc_count);
if (chrc_count == 0)
goto failed;
while (bt_gatt_iter_next_characteristic(&iter, &start, &end, &value,
&properties, u128.data)) {
bt_uuid128_create(&uuid, u128);
/* Log debug message */
bt_uuid_to_string(&uuid, uuid_str, sizeof(uuid_str));
util_debug(client->debug_callback, client->debug_data,
"start: 0x%04x, end: 0x%04x, value: 0x%04x, "
"props: 0x%02x, uuid: %s",
start, end, value, properties, uuid_str);
chrc_data = new0(struct chrc, 1);
if (!chrc_data)
goto failed;
chrc_data->start_handle = start;
chrc_data->end_handle = end;
chrc_data->value_handle = value;
chrc_data->properties = properties;
chrc_data->uuid = uuid;
queue_push_tail(op->pending_chrcs, chrc_data);
}
/*
* Sequentially discover descriptors for each characteristic and insert
* the characteristics into the database as we proceed.
*/
if (!discover_descs(op, &discovering))
goto failed;
if (discovering)
return;
next:
/* Done with the current service */
gatt_db_service_set_active(op->cur_svc, true);
attr = queue_pop_head(op->pending_svcs);
if (!attr)
goto done;
if (!gatt_db_attribute_get_service_handles(attr, &start, &end))
goto failed;
if (start == end)
goto next;
/* Move on to the next service */
op->cur_svc = attr;
client->discovery_req = bt_gatt_discover_characteristics(client->att,
start, end,
discover_chrcs_cb,
discovery_op_ref(op),
discovery_op_unref);
if (client->discovery_req)
return;
util_debug(client->debug_callback, client->debug_data,
"Failed to start characteristic discovery");
discovery_op_unref(op);
failed:
success = false;
done:
op->success = success;
op->complete_func(op, success, att_ecode);
}
static void discover_secondary_cb(bool success, uint8_t att_ecode,
struct bt_gatt_result *result,
void *user_data)
{
struct discovery_op *op = user_data;
struct bt_gatt_client *client = op->client;
struct bt_gatt_iter iter;
struct gatt_db_attribute *attr;
uint16_t start, end;
uint128_t u128;
bt_uuid_t uuid;
char uuid_str[MAX_LEN_UUID_STR];
discovery_req_clear(client);
if (!success) {
util_debug(client->debug_callback, client->debug_data,
"Secondary service discovery failed."
" ATT ECODE: 0x%02x", att_ecode);
switch (att_ecode) {
case BT_ATT_ERROR_ATTRIBUTE_NOT_FOUND:
case BT_ATT_ERROR_UNSUPPORTED_GROUP_TYPE:
goto next;
default:
goto done;
}
}
if (!result || !bt_gatt_iter_init(&iter, result)) {
success = false;
goto done;
}
util_debug(client->debug_callback, client->debug_data,
"Secondary services found: %u",
bt_gatt_result_service_count(result));
while (bt_gatt_iter_next_service(&iter, &start, &end, u128.data)) {
bt_uuid128_create(&uuid, u128);
/* Log debug message */
bt_uuid_to_string(&uuid, uuid_str, sizeof(uuid_str));
util_debug(client->debug_callback, client->debug_data,
"start: 0x%04x, end: 0x%04x, uuid: %s",
start, end, uuid_str);
/* Store the service */
attr = gatt_db_insert_service(client->db, start, &uuid, false,
end - start + 1);
if (!attr) {
gatt_db_clear_range(client->db, start, end);
attr = gatt_db_insert_service(client->db, start, &uuid,
false, end - start + 1);
if (!attr) {
util_debug(client->debug_callback,
client->debug_data,
"Failed to store service");
success = false;
goto done;
}
}
/* Skip if service already active */
if (!gatt_db_service_get_active(attr))
queue_push_tail(op->pending_svcs, attr);
}
next:
/* Sequentially discover included services */
attr = queue_pop_head(op->pending_svcs);
/* Complete with success if queue is empty */
if (!attr) {
success = true;
goto done;
}
/*
* Store the service in the tmp queue to be reused during
* characteristics discovery later.
*/
queue_push_tail(op->tmp_queue, attr);
op->cur_svc = attr;
if (!gatt_db_attribute_get_service_handles(attr, &start, &end)) {
success = false;
goto done;
}
client->discovery_req = bt_gatt_discover_included_services(client->att,
start, end,
discover_incl_cb,
discovery_op_ref(op),
discovery_op_unref);
if (client->discovery_req)
return;
util_debug(client->debug_callback, client->debug_data,
"Failed to start included services discovery");
discovery_op_unref(op);
done:
op->success = success;
op->complete_func(op, success, att_ecode);
}
static void discover_primary_cb(bool success, uint8_t att_ecode,
struct bt_gatt_result *result,
void *user_data)
{
struct discovery_op *op = user_data;
struct bt_gatt_client *client = op->client;
struct bt_gatt_iter iter;
struct gatt_db_attribute *attr;
uint16_t start, end;
uint128_t u128;
bt_uuid_t uuid;
char uuid_str[MAX_LEN_UUID_STR];
discovery_req_clear(client);