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2025-08-19 09:49:41 +08:00
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components/ble/ble_services/ble_nus_c/ble_nus_c.c Normal file
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/**
* Copyright (c) 2012 - 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_NUS_C)
#include <stdlib.h>
#include "ble.h"
#include "ble_nus_c.h"
#include "ble_gattc.h"
#include "ble_srv_common.h"
#include "app_error.h"
#define NRF_LOG_MODULE_NAME ble_nus_c
#include "nrf_log.h"
NRF_LOG_MODULE_REGISTER();
/**@brief Function for intercepting the errors of GATTC and the BLE GATT Queue.
*
* @param[in] nrf_error Error code.
* @param[in] p_ctx Parameter from the event handler.
* @param[in] conn_handle Connection handle.
*/
static void gatt_error_handler(uint32_t nrf_error,
void * p_ctx,
uint16_t conn_handle)
{
ble_nus_c_t * p_ble_nus_c = (ble_nus_c_t *)p_ctx;
NRF_LOG_DEBUG("A GATT Client error has occurred on conn_handle: 0X%X", conn_handle);
if (p_ble_nus_c->error_handler != NULL)
{
p_ble_nus_c->error_handler(nrf_error);
}
}
void ble_nus_c_on_db_disc_evt(ble_nus_c_t * p_ble_nus_c, ble_db_discovery_evt_t * p_evt)
{
ble_nus_c_evt_t nus_c_evt;
memset(&nus_c_evt,0,sizeof(ble_nus_c_evt_t));
ble_gatt_db_char_t * p_chars = p_evt->params.discovered_db.charateristics;
// Check if the NUS was discovered.
if ( (p_evt->evt_type == BLE_DB_DISCOVERY_COMPLETE)
&& (p_evt->params.discovered_db.srv_uuid.uuid == BLE_UUID_NUS_SERVICE)
&& (p_evt->params.discovered_db.srv_uuid.type == p_ble_nus_c->uuid_type))
{
for (uint32_t i = 0; i < p_evt->params.discovered_db.char_count; i++)
{
switch (p_chars[i].characteristic.uuid.uuid)
{
case BLE_UUID_NUS_RX_CHARACTERISTIC:
nus_c_evt.handles.nus_rx_handle = p_chars[i].characteristic.handle_value;
break;
case BLE_UUID_NUS_TX_CHARACTERISTIC:
nus_c_evt.handles.nus_tx_handle = p_chars[i].characteristic.handle_value;
nus_c_evt.handles.nus_tx_cccd_handle = p_chars[i].cccd_handle;
break;
default:
break;
}
}
if (p_ble_nus_c->evt_handler != NULL)
{
nus_c_evt.conn_handle = p_evt->conn_handle;
nus_c_evt.evt_type = BLE_NUS_C_EVT_DISCOVERY_COMPLETE;
p_ble_nus_c->evt_handler(p_ble_nus_c, &nus_c_evt);
}
}
}
/**@brief Function for handling Handle Value Notification received from the SoftDevice.
*
* @details This function uses the Handle Value Notification received from the SoftDevice
* and checks if it is a notification of the NUS TX characteristic from the peer.
* If it is, this function decodes the data and sends it to the application.
*
* @param[in] p_ble_nus_c Pointer to the NUS Client structure.
* @param[in] p_ble_evt Pointer to the BLE event received.
*/
static void on_hvx(ble_nus_c_t * p_ble_nus_c, ble_evt_t const * p_ble_evt)
{
// HVX can only occur from client sending.
if ( (p_ble_nus_c->handles.nus_tx_handle != BLE_GATT_HANDLE_INVALID)
&& (p_ble_evt->evt.gattc_evt.params.hvx.handle == p_ble_nus_c->handles.nus_tx_handle)
&& (p_ble_nus_c->evt_handler != NULL))
{
ble_nus_c_evt_t ble_nus_c_evt;
ble_nus_c_evt.evt_type = BLE_NUS_C_EVT_NUS_TX_EVT;
ble_nus_c_evt.p_data = (uint8_t *)p_ble_evt->evt.gattc_evt.params.hvx.data;
ble_nus_c_evt.data_len = p_ble_evt->evt.gattc_evt.params.hvx.len;
p_ble_nus_c->evt_handler(p_ble_nus_c, &ble_nus_c_evt);
NRF_LOG_DEBUG("Client sending data.");
}
}
uint32_t ble_nus_c_init(ble_nus_c_t * p_ble_nus_c, ble_nus_c_init_t * p_ble_nus_c_init)
{
uint32_t err_code;
ble_uuid_t uart_uuid;
ble_uuid128_t nus_base_uuid = NUS_BASE_UUID;
VERIFY_PARAM_NOT_NULL(p_ble_nus_c);
VERIFY_PARAM_NOT_NULL(p_ble_nus_c_init);
VERIFY_PARAM_NOT_NULL(p_ble_nus_c_init->p_gatt_queue);
err_code = sd_ble_uuid_vs_add(&nus_base_uuid, &p_ble_nus_c->uuid_type);
VERIFY_SUCCESS(err_code);
uart_uuid.type = p_ble_nus_c->uuid_type;
uart_uuid.uuid = BLE_UUID_NUS_SERVICE;
p_ble_nus_c->conn_handle = BLE_CONN_HANDLE_INVALID;
p_ble_nus_c->evt_handler = p_ble_nus_c_init->evt_handler;
p_ble_nus_c->error_handler = p_ble_nus_c_init->error_handler;
p_ble_nus_c->handles.nus_tx_handle = BLE_GATT_HANDLE_INVALID;
p_ble_nus_c->handles.nus_rx_handle = BLE_GATT_HANDLE_INVALID;
p_ble_nus_c->p_gatt_queue = p_ble_nus_c_init->p_gatt_queue;
return ble_db_discovery_evt_register(&uart_uuid);
}
void ble_nus_c_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
{
ble_nus_c_t * p_ble_nus_c = (ble_nus_c_t *)p_context;
if ((p_ble_nus_c == NULL) || (p_ble_evt == NULL))
{
return;
}
if ( (p_ble_nus_c->conn_handle == BLE_CONN_HANDLE_INVALID)
||(p_ble_nus_c->conn_handle != p_ble_evt->evt.gap_evt.conn_handle)
)
{
return;
}
switch (p_ble_evt->header.evt_id)
{
case BLE_GATTC_EVT_HVX:
on_hvx(p_ble_nus_c, p_ble_evt);
break;
case BLE_GAP_EVT_DISCONNECTED:
if (p_ble_evt->evt.gap_evt.conn_handle == p_ble_nus_c->conn_handle
&& p_ble_nus_c->evt_handler != NULL)
{
ble_nus_c_evt_t nus_c_evt;
nus_c_evt.evt_type = BLE_NUS_C_EVT_DISCONNECTED;
p_ble_nus_c->conn_handle = BLE_CONN_HANDLE_INVALID;
p_ble_nus_c->evt_handler(p_ble_nus_c, &nus_c_evt);
}
break;
default:
// No implementation needed.
break;
}
}
/**@brief Function for creating a message for writing to the CCCD. */
static uint32_t cccd_configure(ble_nus_c_t * p_ble_nus_c, bool notification_enable)
{
nrf_ble_gq_req_t cccd_req;
uint8_t cccd[BLE_CCCD_VALUE_LEN];
uint16_t cccd_val = notification_enable ? BLE_GATT_HVX_NOTIFICATION : 0;
memset(&cccd_req, 0, sizeof(nrf_ble_gq_req_t));
cccd[0] = LSB_16(cccd_val);
cccd[1] = MSB_16(cccd_val);
cccd_req.type = NRF_BLE_GQ_REQ_GATTC_WRITE;
cccd_req.error_handler.cb = gatt_error_handler;
cccd_req.error_handler.p_ctx = p_ble_nus_c;
cccd_req.params.gattc_write.handle = p_ble_nus_c->handles.nus_tx_cccd_handle;
cccd_req.params.gattc_write.len = BLE_CCCD_VALUE_LEN;
cccd_req.params.gattc_write.offset = 0;
cccd_req.params.gattc_write.p_value = cccd;
cccd_req.params.gattc_write.write_op = BLE_GATT_OP_WRITE_REQ;
cccd_req.params.gattc_write.flags = BLE_GATT_EXEC_WRITE_FLAG_PREPARED_WRITE;
return nrf_ble_gq_item_add(p_ble_nus_c->p_gatt_queue, &cccd_req, p_ble_nus_c->conn_handle);
}
uint32_t ble_nus_c_tx_notif_enable(ble_nus_c_t * p_ble_nus_c)
{
VERIFY_PARAM_NOT_NULL(p_ble_nus_c);
if ( (p_ble_nus_c->conn_handle == BLE_CONN_HANDLE_INVALID)
||(p_ble_nus_c->handles.nus_tx_cccd_handle == BLE_GATT_HANDLE_INVALID)
)
{
return NRF_ERROR_INVALID_STATE;
}
return cccd_configure(p_ble_nus_c, true);
}
uint32_t ble_nus_c_string_send(ble_nus_c_t * p_ble_nus_c, uint8_t * p_string, uint16_t length)
{
VERIFY_PARAM_NOT_NULL(p_ble_nus_c);
nrf_ble_gq_req_t write_req;
memset(&write_req, 0, sizeof(nrf_ble_gq_req_t));
if (length > BLE_NUS_MAX_DATA_LEN)
{
NRF_LOG_WARNING("Content too long.");
return NRF_ERROR_INVALID_PARAM;
}
if (p_ble_nus_c->conn_handle == BLE_CONN_HANDLE_INVALID)
{
NRF_LOG_WARNING("Connection handle invalid.");
return NRF_ERROR_INVALID_STATE;
}
write_req.type = NRF_BLE_GQ_REQ_GATTC_WRITE;
write_req.error_handler.cb = gatt_error_handler;
write_req.error_handler.p_ctx = p_ble_nus_c;
write_req.params.gattc_write.handle = p_ble_nus_c->handles.nus_rx_handle;
write_req.params.gattc_write.len = length;
write_req.params.gattc_write.offset = 0;
write_req.params.gattc_write.p_value = p_string;
write_req.params.gattc_write.write_op = BLE_GATT_OP_WRITE_CMD;
write_req.params.gattc_write.flags = BLE_GATT_EXEC_WRITE_FLAG_PREPARED_WRITE;
return nrf_ble_gq_item_add(p_ble_nus_c->p_gatt_queue, &write_req, p_ble_nus_c->conn_handle);
}
uint32_t ble_nus_c_handles_assign(ble_nus_c_t * p_ble_nus,
uint16_t conn_handle,
ble_nus_c_handles_t const * p_peer_handles)
{
VERIFY_PARAM_NOT_NULL(p_ble_nus);
p_ble_nus->conn_handle = conn_handle;
if (p_peer_handles != NULL)
{
p_ble_nus->handles.nus_tx_cccd_handle = p_peer_handles->nus_tx_cccd_handle;
p_ble_nus->handles.nus_tx_handle = p_peer_handles->nus_tx_handle;
p_ble_nus->handles.nus_rx_handle = p_peer_handles->nus_rx_handle;
}
return nrf_ble_gq_conn_handle_register(p_ble_nus->p_gatt_queue, conn_handle);
}
#endif // NRF_MODULE_ENABLED(BLE_NUS_C)

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/**
* Copyright (c) 2012 - 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.
*
*/
/**@file
*
* @defgroup ble_nus_c Nordic UART Service Client
* @{
* @ingroup ble_sdk_srv
* @brief Nordic UART Service Client module.
*
* @details This module contains the APIs and types exposed by the Nordic UART Service Client
* module. The application can use these APIs and types to perform the discovery of
* the Nordic UART Service at the peer and to interact with it.
*
* @note The application must register this module as the BLE event observer by using the
* NRF_SDH_BLE_OBSERVER macro. Example:
* @code
* ble_nus_c_t instance;
* NRF_SDH_BLE_OBSERVER(anything, BLE_NUS_C_BLE_OBSERVER_PRIO,
* ble_nus_c_on_ble_evt, &instance);
* @endcode
*
*/
#ifndef BLE_NUS_C_H__
#define BLE_NUS_C_H__
#include <stdint.h>
#include <stdbool.h>
#include "ble.h"
#include "ble_gatt.h"
#include "ble_db_discovery.h"
#include "ble_srv_common.h"
#include "nrf_ble_gq.h"
#include "nrf_sdh_ble.h"
#include "sdk_config.h"
#ifdef __cplusplus
extern "C" {
#endif
/**@brief Macro for defining a ble_nus_c instance.
*
* @param _name Name of the instance.
* @hideinitializer
*/
#define BLE_NUS_C_DEF(_name) \
static ble_nus_c_t _name; \
NRF_SDH_BLE_OBSERVER(_name ## _obs, \
BLE_NUS_C_BLE_OBSERVER_PRIO, \
ble_nus_c_on_ble_evt, &_name)
/** @brief Macro for defining multiple ble_nus_c instances.
*
* @param _name Name of the array of instances.
* @param _cnt Number of instances to define.
* @hideinitializer
*/
#define BLE_NUS_C_ARRAY_DEF(_name, _cnt) \
static ble_nus_c_t _name[_cnt]; \
NRF_SDH_BLE_OBSERVERS(_name ## _obs, \
BLE_NUS_C_BLE_OBSERVER_PRIO, \
ble_nus_c_on_ble_evt, &_name, _cnt)
#define NUS_BASE_UUID {{0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x00, 0x00, 0x40, 0x6E}} /**< Used vendor-specific UUID. */
#define BLE_UUID_NUS_SERVICE 0x0001 /**< The UUID of the Nordic UART Service. */
#define BLE_UUID_NUS_RX_CHARACTERISTIC 0x0002 /**< The UUID of the RX Characteristic. */
#define BLE_UUID_NUS_TX_CHARACTERISTIC 0x0003 /**< The UUID of the TX Characteristic. */
#define OPCODE_LENGTH 1
#define HANDLE_LENGTH 2
/**@brief Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */
#if defined(NRF_SDH_BLE_GATT_MAX_MTU_SIZE) && (NRF_SDH_BLE_GATT_MAX_MTU_SIZE != 0)
#define BLE_NUS_MAX_DATA_LEN (NRF_SDH_BLE_GATT_MAX_MTU_SIZE - OPCODE_LENGTH - HANDLE_LENGTH)
#else
#define BLE_NUS_MAX_DATA_LEN (BLE_GATT_MTU_SIZE_DEFAULT - OPCODE_LENGTH - HANDLE_LENGTH)
#warning NRF_SDH_BLE_GATT_MAX_MTU_SIZE is not defined.
#endif
/**@brief NUS Client event type. */
typedef enum
{
BLE_NUS_C_EVT_DISCOVERY_COMPLETE, /**< Event indicating that the NUS service and its characteristics were found. */
BLE_NUS_C_EVT_NUS_TX_EVT, /**< Event indicating that the central received something from a peer. */
BLE_NUS_C_EVT_DISCONNECTED /**< Event indicating that the NUS server disconnected. */
} ble_nus_c_evt_type_t;
/**@brief Handles on the connected peer device needed to interact with it. */
typedef struct
{
uint16_t nus_tx_handle; /**< Handle of the NUS TX characteristic, as provided by a discovery. */
uint16_t nus_tx_cccd_handle; /**< Handle of the CCCD of the NUS TX characteristic, as provided by a discovery. */
uint16_t nus_rx_handle; /**< Handle of the NUS RX characteristic, as provided by a discovery. */
} ble_nus_c_handles_t;
/**@brief Structure containing the NUS event data received from the peer. */
typedef struct
{
ble_nus_c_evt_type_t evt_type;
uint16_t conn_handle;
uint16_t max_data_len;
uint8_t * p_data;
uint16_t data_len;
ble_nus_c_handles_t handles; /**< Handles on which the Nordic UART service characteristics were discovered on the peer device. This is filled if the evt_type is @ref BLE_NUS_C_EVT_DISCOVERY_COMPLETE.*/
} ble_nus_c_evt_t;
// Forward declaration of the ble_nus_t type.
typedef struct ble_nus_c_s ble_nus_c_t;
/**@brief Event handler type.
*
* @details This is the type of the event handler that is to be provided by the application
* of this module to receive events.
*/
typedef void (* ble_nus_c_evt_handler_t)(ble_nus_c_t * p_ble_nus_c, ble_nus_c_evt_t const * p_evt);
/**@brief NUS Client structure. */
struct ble_nus_c_s
{
uint8_t uuid_type; /**< UUID type. */
uint16_t conn_handle; /**< Handle of the current connection. Set with @ref ble_nus_c_handles_assign when connected. */
ble_nus_c_handles_t handles; /**< Handles on the connected peer device needed to interact with it. */
ble_nus_c_evt_handler_t evt_handler; /**< Application event handler to be called when there is an event related to the NUS. */
ble_srv_error_handler_t error_handler; /**< Function to be called in case of an error. */
nrf_ble_gq_t * p_gatt_queue; /**< Pointer to BLE GATT Queue instance. */
};
/**@brief NUS Client initialization structure. */
typedef struct
{
ble_nus_c_evt_handler_t evt_handler; /**< Application event handler to be called when there is an event related to the NUS. */
ble_srv_error_handler_t error_handler; /**< Function to be called in case of an error. */
nrf_ble_gq_t * p_gatt_queue; /**< Pointer to BLE GATT Queue instance. */
} ble_nus_c_init_t;
/**@brief Function for initializing the Nordic UART client module.
*
* @details This function registers with the Database Discovery module
* for the NUS. The Database Discovery module looks for the presence
* of a NUS instance at the peer when a discovery is started.
*
* @param[in] p_ble_nus_c Pointer to the NUS client structure.
* @param[in] p_ble_nus_c_init Pointer to the NUS initialization structure that contains the
* initialization information.
*
* @retval NRF_SUCCESS If the module was initialized successfully.
* @retval err_code Otherwise, this function propagates the error code
* returned by the Database Discovery module API
* @ref ble_db_discovery_evt_register.
*/
uint32_t ble_nus_c_init(ble_nus_c_t * p_ble_nus_c, ble_nus_c_init_t * p_ble_nus_c_init);
/**@brief Function for handling events from the Database Discovery module.
*
* @details This function handles an event from the Database Discovery module, and determines
* whether it relates to the discovery of NUS at the peer. If it does, the function
* calls the application's event handler to indicate that NUS was
* discovered at the peer. The function also populates the event with service-related
* information before providing it to the application.
*
* @param[in] p_ble_nus_c Pointer to the NUS client structure.
* @param[in] p_evt Pointer to the event received from the Database Discovery module.
*/
void ble_nus_c_on_db_disc_evt(ble_nus_c_t * p_ble_nus_c, ble_db_discovery_evt_t * p_evt);
/**@brief Function for handling BLE events from the SoftDevice.
*
* @details This function handles the BLE events received from the SoftDevice. If a BLE
* event is relevant to the NUS module, the function uses the event's data to update
* internal variables and, if necessary, send events to the application.
*
* @param[in] p_ble_evt Pointer to the BLE event.
* @param[in] p_context Pointer to the NUS client structure.
*/
void ble_nus_c_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context);
/**@brief Function for requesting the peer to start sending notification of TX characteristic.
*
* @details This function enables notifications of the NUS TX characteristic at the peer
* by writing to the CCCD of the NUS TX characteristic.
*
* @param p_ble_nus_c Pointer to the NUS client structure.
*
* @retval NRF_SUCCESS If the operation was successful.
* @retval err_code Otherwise, this API propagates the error code returned by function @ref nrf_ble_gq_item_add.
*/
uint32_t ble_nus_c_tx_notif_enable(ble_nus_c_t * p_ble_nus_c);
/**@brief Function for sending a string to the server.
*
* @details This function writes the RX characteristic of the server.
*
* @param[in] p_ble_nus_c Pointer to the NUS client structure.
* @param[in] p_string String to be sent.
* @param[in] length Length of the string.
*
* @retval NRF_SUCCESS If the string was sent successfully.
* @retval err_code Otherwise, this API propagates the error code returned by function @ref nrf_ble_gq_item_add.
*/
uint32_t ble_nus_c_string_send(ble_nus_c_t * p_ble_nus_c, uint8_t * p_string, uint16_t length);
/**@brief Function for assigning handles to this instance of nus_c.
*
* @details Call this function when a link has been established with a peer to
* associate the link to this instance of the module. This makes it
* possible to handle several links and associate each link to a particular
* instance of this module. The connection handle and attribute handles are
* provided from the discovery event @ref BLE_NUS_C_EVT_DISCOVERY_COMPLETE.
*
* @param[in] p_ble_nus_c Pointer to the NUS client structure instance to associate with these
* handles.
* @param[in] conn_handle Connection handle to associated with the given NUS Instance.
* @param[in] p_peer_handles Attribute handles on the NUS server that you want this NUS client to
* interact with.
*
* @retval NRF_SUCCESS If the operation was successful.
* @retval NRF_ERROR_NULL If a p_nus was a NULL pointer.
* @retval err_code Otherwise, this API propagates the error code returned
* by function @ref nrf_ble_gq_item_add.
*/
uint32_t ble_nus_c_handles_assign(ble_nus_c_t * p_ble_nus_c,
uint16_t conn_handle,
ble_nus_c_handles_t const * p_peer_handles);
#ifdef __cplusplus
}
#endif
#endif // BLE_NUS_C_H__
/** @} */