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HL-PDJ-1/components/ble/ble_db_discovery/ble_db_discovery.c

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2025-08-19 09:49:41 +08:00
/**
* Copyright (c) 2013 - 2020, Nordic Semiconductor ASA
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form, except as embedded into a Nordic
* Semiconductor ASA integrated circuit in a product or a software update for
* such product, must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 4. This software, with or without modification, must only be used with a
* Nordic Semiconductor ASA integrated circuit.
*
* 5. Any software provided in binary form under this license must not be reverse
* engineered, decompiled, modified and/or disassembled.
*
* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "sdk_common.h"
#if NRF_MODULE_ENABLED(BLE_DB_DISCOVERY)
#include "ble_db_discovery.h"
#include <stdlib.h>
#include "ble_srv_common.h"
#define NRF_LOG_MODULE_NAME ble_db_disc
#include "nrf_log.h"
NRF_LOG_MODULE_REGISTER();
#define SRV_DISC_START_HANDLE 0x0001 /**< The start handle value used during service discovery. */
#define DB_DISCOVERY_MAX_USERS BLE_DB_DISCOVERY_MAX_SRV /**< The maximum number of users/registrations allowed by this module. */
#define MODULE_INITIALIZED (m_initialized == true) /**< Macro designating whether the module has been initialized properly. */
/**@brief Array of structures containing information about the registered application modules. */
static ble_uuid_t m_registered_handlers[DB_DISCOVERY_MAX_USERS];
static ble_db_discovery_evt_handler_t m_evt_handler;
static nrf_ble_gq_t * mp_gatt_queue; /**< Pointer to BLE GATT Queue instance. */
static uint32_t m_num_of_handlers_reg; /**< The number of handlers registered with the DB Discovery module. */
static bool m_initialized = false; /**< This variable Indicates if the module is initialized or not. */
/**@brief Function for fetching the event handler provided by a registered application module.
*
* @param[in] srv_uuid UUID of the service.
*
* @retval evt_handler Event handler of the module, registered for the given service UUID.
* @retval NULL If no event handler is found.
*/
static ble_db_discovery_evt_handler_t registered_handler_get(ble_uuid_t const * p_srv_uuid)
{
for (uint32_t i = 0; i < m_num_of_handlers_reg; i++)
{
if (BLE_UUID_EQ(&(m_registered_handlers[i]), p_srv_uuid))
{
return (m_evt_handler);
}
}
return NULL;
}
/**@brief Function for storing the event handler provided by a registered application module.
*
* @param[in] p_srv_uuid The UUID of the service.
* @param[in] p_evt_handler The event handler provided by the application.
*
* @retval NRF_SUCCESS If the handler was stored or already present in the list.
* @retval NRF_ERROR_NO_MEM If there is no space left to store the handler.
*/
static uint32_t registered_handler_set(ble_uuid_t const * p_srv_uuid,
ble_db_discovery_evt_handler_t p_evt_handler)
{
if (registered_handler_get(p_srv_uuid) != NULL)
{
return NRF_SUCCESS;
}
if (m_num_of_handlers_reg < DB_DISCOVERY_MAX_USERS)
{
m_registered_handlers[m_num_of_handlers_reg] = *p_srv_uuid;
m_num_of_handlers_reg++;
return NRF_SUCCESS;
}
else
{
return NRF_ERROR_NO_MEM;
}
}
/**@brief Function for sending all pending discovery events to the corresponding user modules.
*/
static void pending_user_evts_send(ble_db_discovery_t * p_db_discovery)
{
for (uint32_t i = 0; i < m_num_of_handlers_reg; i++)
{
// Pass the event to the corresponding event handler.
p_db_discovery->pending_usr_evts[i].evt_handler(&(p_db_discovery->pending_usr_evts[i].evt));
}
p_db_discovery->pending_usr_evt_index = 0;
}
/**@brief Function for indicating availability of DB discovery instance.
*
* @details This function triggers an event indicating the finish of a discovery process.
* If the event has happened, then the application can perform the next discovery
* procedure on this DB discovery instance.
*
* @param[in] p_db_discovery Pointer to the DB discovery structure.
* @param[in] conn_handle Connection Handle.
*/
static void discovery_available_evt_trigger(ble_db_discovery_t * const p_db_discovery,
uint16_t const conn_handle)
{
ble_db_discovery_evt_t evt;
memset(&evt, 0, sizeof(evt));
evt.conn_handle = conn_handle;
evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE;
evt.params.p_db_instance = (void *)p_db_discovery;
if (m_evt_handler)
{
m_evt_handler(&evt);
}
}
/**@brief Function for indicating error to the application.
*
* @details This function will fetch the event handler based on the UUID of the service being
* discovered. (The event handler is registered by the application beforehand).
* The error code is added to the pending events together with the event handler.
* If no event handler was found, then this function will do nothing.
*
* @param[in] p_db_discovery Pointer to the DB discovery structure.
* @param[in] err_code Error code that should be provided to the application.
* @param[in] conn_handle Connection Handle.
*
*/
static void discovery_error_evt_trigger(ble_db_discovery_t * p_db_discovery,
uint32_t err_code,
uint16_t conn_handle)
{
ble_db_discovery_evt_handler_t p_evt_handler;
ble_gatt_db_srv_t * p_srv_being_discovered;
p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
p_evt_handler = registered_handler_get(&(p_srv_being_discovered->srv_uuid));
if (p_evt_handler != NULL)
{
ble_db_discovery_evt_t evt =
{
.conn_handle = conn_handle,
.evt_type = BLE_DB_DISCOVERY_ERROR,
.params.err_code = err_code,
};
p_evt_handler(&evt);
}
}
/**@brief Function for interception of GATTC and @ref nrf_ble_gq errors.
*
* @param[in] nrf_error Error code.
* @param[in] p_ctx Parameter from the event handler.
* @param[in] conn_handle Connection handle.
*/
static void discovery_error_handler(uint32_t nrf_error,
void * p_ctx,
uint16_t conn_handle)
{
ble_db_discovery_t * p_db_discovery = (ble_db_discovery_t *)p_ctx;
p_db_discovery->discovery_in_progress = false;
discovery_error_evt_trigger(p_db_discovery, nrf_error, conn_handle);
discovery_available_evt_trigger(p_db_discovery, conn_handle);
}
/**@brief Function for triggering a Discovery Complete or Service Not Found event to the
* application.
*
* @details This function will fetch the event handler based on the UUID of the service being
* discovered. (The event handler is registered by the application beforehand).
* It then triggers an event indicating the completion of the service discovery.
* If no event handler was found, then this function will do nothing.
*
* @param[in] p_db_discovery Pointer to the DB discovery structure.
* @param[in] is_srv_found Variable to indicate if the service was found at the peer.
* @param[in] conn_handle Connection Handle.
*/
static void discovery_complete_evt_trigger(ble_db_discovery_t * p_db_discovery,
bool is_srv_found,
uint16_t conn_handle)
{
ble_db_discovery_evt_handler_t p_evt_handler;
ble_gatt_db_srv_t * p_srv_being_discovered;
p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
p_evt_handler = registered_handler_get(&(p_srv_being_discovered->srv_uuid));
if (p_evt_handler != NULL)
{
if (p_db_discovery->pending_usr_evt_index < DB_DISCOVERY_MAX_USERS)
{
// Insert an event into the pending event list.
p_db_discovery->pending_usr_evts[p_db_discovery->pending_usr_evt_index].evt.conn_handle = conn_handle;
p_db_discovery->pending_usr_evts[p_db_discovery->pending_usr_evt_index].evt.params.discovered_db =
*p_srv_being_discovered;
if (is_srv_found)
{
p_db_discovery->pending_usr_evts[p_db_discovery->pending_usr_evt_index].evt.evt_type =
BLE_DB_DISCOVERY_COMPLETE;
}
else
{
p_db_discovery->pending_usr_evts[p_db_discovery->pending_usr_evt_index].evt.evt_type =
BLE_DB_DISCOVERY_SRV_NOT_FOUND;
}
p_db_discovery->pending_usr_evts[p_db_discovery->pending_usr_evt_index].evt_handler = p_evt_handler;
p_db_discovery->pending_usr_evt_index++;
if (p_db_discovery->pending_usr_evt_index == m_num_of_handlers_reg)
{
// All registered modules have pending events. Send all pending events to the user
// modules.
pending_user_evts_send(p_db_discovery);
}
else
{
// Too many events pending. Do nothing. (Ideally this should not happen.)
}
}
}
}
/**@brief Function for handling service discovery completion.
*
* @details This function will be used to determine if there are more services to be discovered,
* and if so, initiate the discovery of the next service.
*
* @param[in] p_db_discovery Pointer to the DB Discovery Structure.
* @param[in] conn_handle Connection Handle.
*/
static void on_srv_disc_completion(ble_db_discovery_t * p_db_discovery,
uint16_t conn_handle)
{
nrf_ble_gq_req_t db_srv_disc_req;
memset(&db_srv_disc_req, 0, sizeof(nrf_ble_gq_req_t));
p_db_discovery->discoveries_count++;
// Check if more services need to be discovered.
if (p_db_discovery->discoveries_count < m_num_of_handlers_reg)
{
// Reset the current characteristic index since a new service discovery is about to start.
p_db_discovery->curr_char_ind = 0;
// Initiate discovery of the next service.
p_db_discovery->curr_srv_ind++;
ble_gatt_db_srv_t * p_srv_being_discovered;
p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
p_srv_being_discovered->srv_uuid = m_registered_handlers[p_db_discovery->curr_srv_ind];
// Reset the characteristic count in the current service to zero since a new service
// discovery is about to start.
p_srv_being_discovered->char_count = 0;
NRF_LOG_DEBUG("Starting discovery of service with UUID 0x%x on connection handle 0x%x.",
p_srv_being_discovered->srv_uuid.uuid, conn_handle);
uint32_t err_code;
db_srv_disc_req.type = NRF_BLE_GQ_REQ_SRV_DISCOVERY;
db_srv_disc_req.params.gattc_srv_disc.start_handle = SRV_DISC_START_HANDLE;
db_srv_disc_req.params.gattc_srv_disc.srvc_uuid = p_srv_being_discovered->srv_uuid;
db_srv_disc_req.error_handler.p_ctx = p_db_discovery;
db_srv_disc_req.error_handler.cb = discovery_error_handler;
err_code = nrf_ble_gq_item_add(mp_gatt_queue, &db_srv_disc_req, conn_handle);
if (err_code != NRF_SUCCESS)
{
discovery_error_handler(err_code, p_db_discovery, conn_handle);
return;
}
}
else
{
// No more service discovery is needed.
p_db_discovery->discovery_in_progress = false;
discovery_available_evt_trigger(p_db_discovery, conn_handle);
}
}
/**@brief Function for finding out if a characteristic discovery should be performed after the
* last discovered characteristic.
*
* @details This function is used during the time of database discovery to find out if there is
* a need to do more characteristic discoveries. The value handles of the
* last discovered characteristic is compared with the end handle of the service.
* If the service handle is greater than one of the former characteristic handles,
* it means that a characteristic discovery is required.
*
* @param[in] p_db_discovery The pointer to the DB Discovery structure.
* @param[in] p_after_char The pointer to the last discovered characteristic.
*
* @retval True if a characteristic discovery is required.
* @retval False if a characteristic discovery is NOT required.
*/
static bool is_char_discovery_reqd(ble_db_discovery_t * p_db_discovery,
ble_gattc_char_t * p_after_char)
{
if (p_after_char->handle_value <
p_db_discovery->services[p_db_discovery->curr_srv_ind].handle_range.end_handle)
{
// Handle value of the characteristic being discovered is less than the end handle of
// the service being discovered. There is a possibility of more characteristics being
// present. Hence a characteristic discovery is required.
return true;
}
return false;
}
/**@brief Function to find out if a descriptor discovery is required.
*
* @details This function finds out if there is a possibility of existence of descriptors between
* current characteristic and the next characteristic. If so, this function will compute
* the handle range on which the descriptors may be present and will return it.
* If the current characteristic is the last known characteristic, then this function
* will use the service end handle to find out if the current characteristic can have
* descriptors.
*
* @param[in] p_db_discovery Pointer to the DB Discovery structure.
* @param[in] p_curr_char Pointer to the current characteristic.
* @param[in] p_next_char Pointer to the next characteristic. This should be NULL if the
* caller knows that there is no characteristic after the current
* characteristic at the peer.
* @param[out] p_handle_range Pointer to the handle range in which descriptors may exist at the
* the peer.
*
* @retval True If a descriptor discovery is required.
* @retval False If a descriptor discovery is NOT required.
*/
static bool is_desc_discovery_reqd(ble_db_discovery_t * p_db_discovery,
ble_gatt_db_char_t * p_curr_char,
ble_gatt_db_char_t * p_next_char,
ble_gattc_handle_range_t * p_handle_range)
{
if (p_next_char == NULL)
{
// Current characteristic is the last characteristic in the service. Check if the value
// handle of the current characteristic is equal to the service end handle.
if (
p_curr_char->characteristic.handle_value ==
p_db_discovery->services[p_db_discovery->curr_srv_ind].handle_range.end_handle
)
{
// No descriptors can be present for the current characteristic. p_curr_char is the last
// characteristic with no descriptors.
return false;
}
p_handle_range->start_handle = p_curr_char->characteristic.handle_value + 1;
// Since the current characteristic is the last characteristic in the service, the end
// handle should be the end handle of the service.
p_handle_range->end_handle =
p_db_discovery->services[p_db_discovery->curr_srv_ind].handle_range.end_handle;
return true;
}
// p_next_char != NULL. Check for existence of descriptors between the current and the next
// characteristic.
if ((p_curr_char->characteristic.handle_value + 1) == p_next_char->characteristic.handle_decl)
{
// No descriptors can exist between the two characteristic.
return false;
}
p_handle_range->start_handle = p_curr_char->characteristic.handle_value + 1;
p_handle_range->end_handle = p_next_char->characteristic.handle_decl - 1;
return true;
}
/**@brief Function for performing characteristic discovery.
*
* @param[in] p_db_discovery Pointer to the DB Discovery structure.
* @param[in] conn_handle Connection Handle.
*
* @return NRF_SUCCESS if the SoftDevice was successfully requested to perform the characteristic
* discovery. Otherwise an error code. This function returns the error code returned
* by the SoftDevice API @ref sd_ble_gattc_characteristics_discover.
*/
static uint32_t characteristics_discover(ble_db_discovery_t * p_db_discovery,
uint16_t conn_handle)
{
ble_gatt_db_srv_t * p_srv_being_discovered;
ble_gattc_handle_range_t handle_range;
nrf_ble_gq_req_t db_char_disc_req;
memset(&db_char_disc_req, 0, sizeof(nrf_ble_gq_req_t));
memset(&handle_range, 0, sizeof(ble_gattc_handle_range_t));
p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
if (p_db_discovery->curr_char_ind != 0)
{
// This is not the first characteristic being discovered. Hence the 'start handle' to be
// used must be computed using the handle_value of the previous characteristic.
ble_gattc_char_t * p_prev_char;
uint8_t prev_char_ind = p_db_discovery->curr_char_ind - 1;
p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
p_prev_char = &(p_srv_being_discovered->charateristics[prev_char_ind].characteristic);
handle_range.start_handle = p_prev_char->handle_value + 1;
}
else
{
// This is the first characteristic of this service being discovered.
handle_range.start_handle = p_srv_being_discovered->handle_range.start_handle;
}
handle_range.end_handle = p_srv_being_discovered->handle_range.end_handle;
db_char_disc_req.type = NRF_BLE_GQ_REQ_CHAR_DISCOVERY;
db_char_disc_req.params.gattc_char_disc = handle_range;
db_char_disc_req.error_handler.p_ctx = p_db_discovery;
db_char_disc_req.error_handler.cb = discovery_error_handler;
return nrf_ble_gq_item_add(mp_gatt_queue, &db_char_disc_req, conn_handle);
}
/**@brief Function for performing descriptor discovery, if required.
*
* @details This function will check if descriptor discovery is required and then perform it if
* needed. If no more descriptor discovery is required for the service, then the output
* parameter p_raise_discov_complete is set to true, indicating to the caller that a
* discovery complete event can be triggered to the application.
*
* @param[in] p_db_discovery Pointer to the DB Discovery structure.
* @param[out] p_raise_discov_complete The value pointed to by this pointer will be set to true if
* the Discovery Complete event can be triggered to the
* application.
* @param[in] conn_handle Connection Handle.
*
* @return NRF_SUCCESS if the SoftDevice was successfully requested to perform the descriptor
* discovery, or if no more descriptor discovery is required. Otherwise an error code.
* This function returns the error code returned by the SoftDevice API @ref
* sd_ble_gattc_descriptors_discover.
*/
static uint32_t descriptors_discover(ble_db_discovery_t * p_db_discovery,
bool * p_raise_discov_complete,
uint16_t conn_handle)
{
ble_gattc_handle_range_t handle_range;
ble_gatt_db_char_t * p_curr_char_being_discovered;
ble_gatt_db_srv_t * p_srv_being_discovered;
nrf_ble_gq_req_t db_desc_disc_req;
bool is_discovery_reqd = false;
memset(&db_desc_disc_req, 0, sizeof(nrf_ble_gq_req_t));
p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
p_curr_char_being_discovered =
&(p_srv_being_discovered->charateristics[p_db_discovery->curr_char_ind]);
if ((p_db_discovery->curr_char_ind + 1) == p_srv_being_discovered->char_count)
{
// This is the last characteristic of this service.
is_discovery_reqd = is_desc_discovery_reqd(p_db_discovery,
p_curr_char_being_discovered,
NULL,
&handle_range);
}
else
{
uint8_t i;
ble_gatt_db_char_t * p_next_char;
for (i = p_db_discovery->curr_char_ind; i < p_srv_being_discovered->char_count; i++)
{
if (i == (p_srv_being_discovered->char_count - 1))
{
// The current characteristic is the last characteristic in the service.
p_next_char = NULL;
}
else
{
p_next_char = &(p_srv_being_discovered->charateristics[i + 1]);
}
// Check if it is possible for the current characteristic to have a descriptor.
if (is_desc_discovery_reqd(p_db_discovery,
p_curr_char_being_discovered,
p_next_char,
&handle_range))
{
is_discovery_reqd = true;
break;
}
else
{
// No descriptors can exist.
p_curr_char_being_discovered = p_next_char;
p_db_discovery->curr_char_ind++;
}
}
}
if (!is_discovery_reqd)
{
// No more descriptor discovery required. Discovery is complete.
// This informs the caller that a discovery complete event can be triggered.
*p_raise_discov_complete = true;
return NRF_SUCCESS;
}
*p_raise_discov_complete = false;
db_desc_disc_req.type = NRF_BLE_GQ_REQ_DESC_DISCOVERY;
db_desc_disc_req.params.gattc_desc_disc = handle_range;
db_desc_disc_req.error_handler.p_ctx = p_db_discovery;
db_desc_disc_req.error_handler.cb = discovery_error_handler;
return nrf_ble_gq_item_add(mp_gatt_queue, &db_desc_disc_req, conn_handle);
}
/**@brief Function for handling primary service discovery response.
*
* @details This function will handle the primary service discovery response and start the
* discovery of characteristics within that service.
*
* @param[in] p_db_discovery Pointer to the DB Discovery structure.
* @param[in] p_ble_gattc_evt Pointer to the GATT Client event.
*/
static void on_primary_srv_discovery_rsp(ble_db_discovery_t * p_db_discovery,
ble_gattc_evt_t const * p_ble_gattc_evt)
{
ble_gatt_db_srv_t * p_srv_being_discovered;
p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
if (p_ble_gattc_evt->conn_handle != p_db_discovery->conn_handle)
{
return;
}
if (p_ble_gattc_evt->gatt_status == BLE_GATT_STATUS_SUCCESS)
{
uint32_t err_code;
ble_gattc_evt_prim_srvc_disc_rsp_t const * p_prim_srvc_disc_rsp_evt;
NRF_LOG_DEBUG("Found service UUID 0x%x.", p_srv_being_discovered->srv_uuid.uuid);
p_prim_srvc_disc_rsp_evt = &(p_ble_gattc_evt->params.prim_srvc_disc_rsp);
p_srv_being_discovered->handle_range = p_prim_srvc_disc_rsp_evt->services[0].handle_range;
// Number of services, previously discovered.
uint8_t num_srv_previous_disc = p_db_discovery->srv_count;
// Number of services, currently discovered.
uint8_t current_srv_disc = p_prim_srvc_disc_rsp_evt->count;
if ((num_srv_previous_disc + current_srv_disc) <= BLE_DB_DISCOVERY_MAX_SRV)
{
p_db_discovery->srv_count += current_srv_disc;
}
else
{
p_db_discovery->srv_count = BLE_DB_DISCOVERY_MAX_SRV;
NRF_LOG_WARNING("Not enough space for services.");
NRF_LOG_WARNING("Increase BLE_DB_DISCOVERY_MAX_SRV to be able to store more "
"services!");
}
err_code = characteristics_discover(p_db_discovery, p_ble_gattc_evt->conn_handle);
if (err_code != NRF_SUCCESS)
{
discovery_error_handler(err_code, p_db_discovery, p_ble_gattc_evt->conn_handle);
}
}
else
{
NRF_LOG_DEBUG("Service UUID 0x%x not found.", p_srv_being_discovered->srv_uuid.uuid);
// Trigger Service Not Found event to the application.
discovery_complete_evt_trigger(p_db_discovery, false, p_ble_gattc_evt->conn_handle);
on_srv_disc_completion(p_db_discovery, p_ble_gattc_evt->conn_handle);
}
}
/**@brief Function for handling characteristic discovery response.
*
* @param[in] p_db_discovery Pointer to the DB Discovery structure.
* @param[in] p_ble_gattc_evt Pointer to the GATT Client event.
*/
static void on_characteristic_discovery_rsp(ble_db_discovery_t * p_db_discovery,
ble_gattc_evt_t const * p_ble_gattc_evt)
{
uint32_t err_code;
ble_gatt_db_srv_t * p_srv_being_discovered;
bool perform_desc_discov = false;
if (p_ble_gattc_evt->conn_handle != p_db_discovery->conn_handle)
{
return;
}
p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
if (p_ble_gattc_evt->gatt_status == BLE_GATT_STATUS_SUCCESS)
{
ble_gattc_evt_char_disc_rsp_t const * p_char_disc_rsp_evt;
p_char_disc_rsp_evt = &(p_ble_gattc_evt->params.char_disc_rsp);
// Find out the number of characteristics that were previously discovered (in earlier
// characteristic discovery responses, if any).
uint8_t num_chars_prev_disc = p_srv_being_discovered->char_count;
// Find out the number of characteristics that are currently discovered (in the
// characteristic discovery response being handled).
uint8_t num_chars_curr_disc = p_char_disc_rsp_evt->count;
// Check if the total number of discovered characteristics are supported by this module.
if ((num_chars_prev_disc + num_chars_curr_disc) <= BLE_GATT_DB_MAX_CHARS)
{
// Update the characteristics count.
p_srv_being_discovered->char_count += num_chars_curr_disc;
}
else
{
// The number of characteristics discovered at the peer is more than the supported
// maximum. This module will store only the characteristics found up to this point.
p_srv_being_discovered->char_count = BLE_GATT_DB_MAX_CHARS;
NRF_LOG_WARNING("Not enough space for characteristics associated with "
"service 0x%04X !", p_srv_being_discovered->srv_uuid.uuid);
NRF_LOG_WARNING("Increase BLE_GATT_DB_MAX_CHARS to be able to store more "
"characteristics for each service!");
}
uint32_t i;
uint32_t j;
for (i = num_chars_prev_disc, j = 0; i < p_srv_being_discovered->char_count; i++, j++)
{
p_srv_being_discovered->charateristics[i].characteristic =
p_char_disc_rsp_evt->chars[j];
p_srv_being_discovered->charateristics[i].cccd_handle = BLE_GATT_HANDLE_INVALID;
p_srv_being_discovered->charateristics[i].ext_prop_handle = BLE_GATT_HANDLE_INVALID;
p_srv_being_discovered->charateristics[i].user_desc_handle = BLE_GATT_HANDLE_INVALID;
p_srv_being_discovered->charateristics[i].report_ref_handle = BLE_GATT_HANDLE_INVALID;
}
ble_gattc_char_t * p_last_known_char;
p_last_known_char = &(p_srv_being_discovered->charateristics[i - 1].characteristic);
// If no more characteristic discovery is required, or if the maximum number of supported
// characteristic per service has been reached, descriptor discovery will be performed.
if ( !is_char_discovery_reqd(p_db_discovery, p_last_known_char)
|| (p_srv_being_discovered->char_count == BLE_GATT_DB_MAX_CHARS))
{
perform_desc_discov = true;
}
else
{
// Update the current characteristic index.
p_db_discovery->curr_char_ind = p_srv_being_discovered->char_count;
// Perform another round of characteristic discovery.
err_code = characteristics_discover(p_db_discovery, p_ble_gattc_evt->conn_handle);
if (err_code != NRF_SUCCESS)
{
discovery_error_handler(err_code, p_db_discovery, p_ble_gattc_evt->conn_handle);
return;
}
}
}
else
{
// The previous characteristic discovery resulted in no characteristics.
// descriptor discovery should be performed.
perform_desc_discov = true;
}
if (perform_desc_discov)
{
bool raise_discov_complete;
p_db_discovery->curr_char_ind = 0;
err_code = descriptors_discover(p_db_discovery,
&raise_discov_complete,
p_ble_gattc_evt->conn_handle);
if (err_code != NRF_SUCCESS)
{
discovery_error_handler(err_code, p_db_discovery, p_ble_gattc_evt->conn_handle);
return;
}
if (raise_discov_complete)
{
// No more characteristics and descriptors need to be discovered. Discovery is complete.
// Send a discovery complete event to the user application.
NRF_LOG_DEBUG("Discovery of service with UUID 0x%x completed with success"
" on connection handle 0x%x.",
p_srv_being_discovered->srv_uuid.uuid,
p_ble_gattc_evt->conn_handle);
discovery_complete_evt_trigger(p_db_discovery, true, p_ble_gattc_evt->conn_handle);
on_srv_disc_completion(p_db_discovery, p_ble_gattc_evt->conn_handle);
}
}
}
/**@brief Function for handling descriptor discovery response.
*
* @param[in] p_db_discovery Pointer to the DB Discovery structure.
* @param[in] p_ble_gattc_evt Pointer to the GATT Client event.
*/
static void on_descriptor_discovery_rsp(ble_db_discovery_t * const p_db_discovery,
const ble_gattc_evt_t * const p_ble_gattc_evt)
{
const ble_gattc_evt_desc_disc_rsp_t * p_desc_disc_rsp_evt;
ble_gatt_db_srv_t * p_srv_being_discovered;
if (p_ble_gattc_evt->conn_handle != p_db_discovery->conn_handle)
{
return;
}
p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
p_desc_disc_rsp_evt = &(p_ble_gattc_evt->params.desc_disc_rsp);
ble_gatt_db_char_t * p_char_being_discovered =
&(p_srv_being_discovered->charateristics[p_db_discovery->curr_char_ind]);
if (p_ble_gattc_evt->gatt_status == BLE_GATT_STATUS_SUCCESS)
{
// The descriptor was found at the peer.
// Iterate through and collect CCCD, Extended Properties,
// User Description & Report Reference descriptor handles.
for (uint32_t i = 0; i < p_desc_disc_rsp_evt->count; i++)
{
switch (p_desc_disc_rsp_evt->descs[i].uuid.uuid)
{
case BLE_UUID_DESCRIPTOR_CLIENT_CHAR_CONFIG:
p_char_being_discovered->cccd_handle =
p_desc_disc_rsp_evt->descs[i].handle;
break;
case BLE_UUID_DESCRIPTOR_CHAR_EXT_PROP:
p_char_being_discovered->ext_prop_handle =
p_desc_disc_rsp_evt->descs[i].handle;
break;
case BLE_UUID_DESCRIPTOR_CHAR_USER_DESC:
p_char_being_discovered->user_desc_handle =
p_desc_disc_rsp_evt->descs[i].handle;
break;
case BLE_UUID_REPORT_REF_DESCR:
p_char_being_discovered->report_ref_handle =
p_desc_disc_rsp_evt->descs[i].handle;
break;
}
/* Break if we've found all the descriptors we are looking for. */
if (p_char_being_discovered->cccd_handle != BLE_GATT_HANDLE_INVALID &&
p_char_being_discovered->ext_prop_handle != BLE_GATT_HANDLE_INVALID &&
p_char_being_discovered->user_desc_handle != BLE_GATT_HANDLE_INVALID &&
p_char_being_discovered->report_ref_handle != BLE_GATT_HANDLE_INVALID)
{
break;
}
}
}
bool raise_discov_complete = false;
if ((p_db_discovery->curr_char_ind + 1) == p_srv_being_discovered->char_count)
{
// No more characteristics and descriptors need to be discovered. Discovery is complete.
// Send a discovery complete event to the user application.
raise_discov_complete = true;
}
else
{
// Begin discovery of descriptors for the next characteristic.
uint32_t err_code;
p_db_discovery->curr_char_ind++;
err_code = descriptors_discover(p_db_discovery,
&raise_discov_complete,
p_ble_gattc_evt->conn_handle);
if (err_code != NRF_SUCCESS)
{
discovery_error_handler(err_code, p_db_discovery, p_ble_gattc_evt->conn_handle);
return;
}
}
if (raise_discov_complete)
{
NRF_LOG_DEBUG("Discovery of service with UUID 0x%x completed with success"
" on connection handle 0x%x.",
p_srv_being_discovered->srv_uuid.uuid,
p_ble_gattc_evt->conn_handle);
discovery_complete_evt_trigger(p_db_discovery, true, p_ble_gattc_evt->conn_handle);
on_srv_disc_completion(p_db_discovery, p_ble_gattc_evt->conn_handle);
}
}
uint32_t ble_db_discovery_init(ble_db_discovery_init_t * p_db_init)
{
uint32_t err_code = NRF_SUCCESS;
VERIFY_PARAM_NOT_NULL(p_db_init);
VERIFY_PARAM_NOT_NULL(p_db_init->evt_handler);
VERIFY_PARAM_NOT_NULL(p_db_init->p_gatt_queue);
m_num_of_handlers_reg = 0;
m_initialized = true;
m_evt_handler = p_db_init->evt_handler;
mp_gatt_queue = p_db_init->p_gatt_queue;
return err_code;
}
uint32_t ble_db_discovery_close(ble_db_discovery_t * const p_db_discovery)
{
m_num_of_handlers_reg = 0;
m_initialized = false;
p_db_discovery->pending_usr_evt_index = 0;
return NRF_SUCCESS;
}
uint32_t ble_db_discovery_evt_register(ble_uuid_t const * p_uuid)
{
VERIFY_PARAM_NOT_NULL(p_uuid);
VERIFY_MODULE_INITIALIZED();
return registered_handler_set(p_uuid, m_evt_handler);
}
static uint32_t discovery_start(ble_db_discovery_t * const p_db_discovery, uint16_t conn_handle)
{
ret_code_t err_code;
ble_gatt_db_srv_t * p_srv_being_discovered;
nrf_ble_gq_req_t db_srv_disc_req;
memset(p_db_discovery, 0x00, sizeof(ble_db_discovery_t));
memset(&db_srv_disc_req, 0x00, sizeof(nrf_ble_gq_req_t));
err_code = nrf_ble_gq_conn_handle_register(mp_gatt_queue, conn_handle);
VERIFY_SUCCESS(err_code);
p_db_discovery->conn_handle = conn_handle;
p_db_discovery->pending_usr_evt_index = 0;
p_db_discovery->discoveries_count = 0;
p_db_discovery->curr_srv_ind = 0;
p_db_discovery->curr_char_ind = 0;
p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
p_srv_being_discovered->srv_uuid = m_registered_handlers[p_db_discovery->curr_srv_ind];
NRF_LOG_DEBUG("Starting discovery of service with UUID 0x%x on connection handle 0x%x.",
p_srv_being_discovered->srv_uuid.uuid, conn_handle);
db_srv_disc_req.type = NRF_BLE_GQ_REQ_SRV_DISCOVERY;
db_srv_disc_req.params.gattc_srv_disc.start_handle = SRV_DISC_START_HANDLE;
db_srv_disc_req.params.gattc_srv_disc.srvc_uuid = p_srv_being_discovered->srv_uuid;
db_srv_disc_req.error_handler.p_ctx = p_db_discovery;
db_srv_disc_req.error_handler.cb = discovery_error_handler;
err_code = nrf_ble_gq_item_add(mp_gatt_queue, &db_srv_disc_req, conn_handle);
if (err_code == NRF_SUCCESS)
{
p_db_discovery->discovery_in_progress = true;
}
return err_code;
}
uint32_t ble_db_discovery_start(ble_db_discovery_t * const p_db_discovery, uint16_t conn_handle)
{
VERIFY_PARAM_NOT_NULL(p_db_discovery);
VERIFY_MODULE_INITIALIZED();
if (m_num_of_handlers_reg == 0)
{
// No user modules were registered. There are no services to discover.
return NRF_ERROR_INVALID_STATE;
}
if (p_db_discovery->discovery_in_progress)
{
return NRF_ERROR_BUSY;
}
return discovery_start(p_db_discovery, conn_handle);
}
/**@brief Function for handling disconnected event.
*
* @param[in] p_db_discovery Pointer to the DB Discovery structure.
* @param[in] p_ble_gattc_evt Pointer to the GAP event.
*/
static void on_disconnected(ble_db_discovery_t * p_db_discovery,
ble_gap_evt_t const * p_evt)
{
if (p_evt->conn_handle == p_db_discovery->conn_handle)
{
p_db_discovery->discovery_in_progress = false;
p_db_discovery->conn_handle = BLE_CONN_HANDLE_INVALID;
}
}
void ble_db_discovery_on_ble_evt(ble_evt_t const * p_ble_evt,
void * p_context)
{
VERIFY_PARAM_NOT_NULL_VOID(p_ble_evt);
VERIFY_PARAM_NOT_NULL_VOID(p_context);
VERIFY_MODULE_INITIALIZED_VOID();
ble_db_discovery_t * p_db_discovery = (ble_db_discovery_t *)p_context;
switch (p_ble_evt->header.evt_id)
{
case BLE_GATTC_EVT_PRIM_SRVC_DISC_RSP:
on_primary_srv_discovery_rsp(p_db_discovery, &(p_ble_evt->evt.gattc_evt));
break;
case BLE_GATTC_EVT_CHAR_DISC_RSP:
on_characteristic_discovery_rsp(p_db_discovery, &(p_ble_evt->evt.gattc_evt));
break;
case BLE_GATTC_EVT_DESC_DISC_RSP:
on_descriptor_discovery_rsp(p_db_discovery, &(p_ble_evt->evt.gattc_evt));
break;
case BLE_GAP_EVT_DISCONNECTED:
on_disconnected(p_db_discovery, &(p_ble_evt->evt.gap_evt));
break;
default:
break;
}
}
#endif // NRF_MODULE_ENABLED(BLE_DB_DISCOVERY)
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