421 lines
14 KiB
C
421 lines
14 KiB
C
/**
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* Copyright (c) 2012 - 2020, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/* Attention!
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* To maintain compliance with Nordic Semiconductor ASA's Bluetooth profile
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* qualification listings, this section of source code must not be modified.
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*/
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#include "sdk_common.h"
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#if NRF_MODULE_ENABLED(BLE_BPS)
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#include "ble_bps.h"
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#include "ble_err.h"
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#include <string.h>
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#include "nordic_common.h"
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#include "ble_srv_common.h"
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#define OPCODE_LENGTH 1 /**< Length of opcode inside Blood Pressure Measurement packet. */
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#define HANDLE_LENGTH 2 /**< Length of handle inside Blood Pressure Measurement packet. */
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#define MAX_BPM_LEN (BLE_GATT_ATT_MTU_DEFAULT - OPCODE_LENGTH - HANDLE_LENGTH) /**< Maximum size of a transmitted Blood Pressure Measurement. */
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// Blood Pressure Measurement Flags bits
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#define BPS_MEAS_BLOOD_PRESSURE_UNITS_FLAG_BIT (0x01 << 0) /**< Blood Pressure Units Flag bit. */
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#define BPS_MEAS_TIME_STAMP_FLAG_BIT (0x01 << 1) /**< Time Stamp Flag bit. */
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#define BPS_MEAS_PULSE_RATE_FLAG_BIT (0x01 << 2) /**< Pulse Rate Flag bit. */
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#define BPS_MEAS_USER_ID_FLAG_BIT (0x01 << 3) /**< User ID Flag bit. */
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#define BPS_MEAS_MEASUREMENT_STATUS_FLAG_BIT (0x01 << 4) /**< Measurement Status Flag bit. */
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/**@brief Function for interception of GATT errors and @ref nrf_ble_gq errors.
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*
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* @param[in] nrf_error Error code.
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* @param[in] p_ctx Parameter from the event handler.
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* @param[in] conn_handle Connection handle.
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*/
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static void gatt_error_handler(uint32_t nrf_error,
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void * p_ctx,
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uint16_t conn_handle)
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{
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ble_bps_t * p_bps = (ble_bps_t *)p_ctx;
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if (p_bps->error_handler != NULL)
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{
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p_bps->error_handler(nrf_error);
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}
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}
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/**@brief Function for handling the Connect event.
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*
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* @param[in] p_bps Blood Pressure Service structure.
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* @param[in] p_ble_evt Event received from the BLE stack.
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*/
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static void on_connect(ble_bps_t * p_bps, ble_evt_t const * p_ble_evt)
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{
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ret_code_t err_code;
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p_bps->conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
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err_code = nrf_ble_gq_conn_handle_register(p_bps->p_gatt_queue,
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p_ble_evt->evt.gap_evt.conn_handle);
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if ((p_bps->error_handler != NULL) &&
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(err_code != NRF_SUCCESS))
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{
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p_bps->error_handler(err_code);
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}
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}
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/**@brief Function for handling the Disconnect event.
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*
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* @param[in] p_bps Blood Pressure Service structure.
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* @param[in] p_ble_evt Event received from the BLE stack.
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*/
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static void on_disconnect(ble_bps_t * p_bps, ble_evt_t const * p_ble_evt)
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{
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UNUSED_PARAMETER(p_ble_evt);
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p_bps->conn_handle = BLE_CONN_HANDLE_INVALID;
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}
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/**@brief Function for handling the write events to the Blood Pressure Measurement characteristic.
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*
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* @param[in] p_bps Blood Pressure Service structure.
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* @param[in] p_evt_write Write event received from the BLE stack.
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*/
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static void on_cccd_write(ble_bps_t * p_bps, ble_gatts_evt_write_t const * p_evt_write)
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{
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if (p_evt_write->len == 2)
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{
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// CCCD written, update indication state
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if (p_bps->evt_handler != NULL)
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{
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ble_bps_evt_t evt;
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if (ble_srv_is_indication_enabled(p_evt_write->data))
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{
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evt.evt_type = BLE_BPS_EVT_INDICATION_ENABLED;
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}
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else
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{
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evt.evt_type = BLE_BPS_EVT_INDICATION_DISABLED;
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}
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p_bps->evt_handler(p_bps, &evt);
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}
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}
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}
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/**@brief Function for handling the Write event.
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*
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* @param[in] p_bps Blood Pressure Service structure.
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* @param[in] p_ble_evt Event received from the BLE stack.
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*/
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static void on_write(ble_bps_t * p_bps, ble_evt_t const * p_ble_evt)
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{
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ble_gatts_evt_write_t const * p_evt_write = &p_ble_evt->evt.gatts_evt.params.write;
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if (p_evt_write->handle == p_bps->meas_handles.cccd_handle)
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{
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on_cccd_write(p_bps, p_evt_write);
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}
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}
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/**@brief Function for handling the HVC event.
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*
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* @details Handles HVC events from the BLE stack.
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*
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* @param[in] p_bps Blood Pressure Service structure.
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* @param[in] p_ble_evt Event received from the BLE stack.
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*/
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static void on_hvc(ble_bps_t * p_bps, ble_evt_t const * p_ble_evt)
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{
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ble_gatts_evt_hvc_t const * p_hvc = &p_ble_evt->evt.gatts_evt.params.hvc;
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if (p_hvc->handle == p_bps->meas_handles.value_handle)
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{
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ble_bps_evt_t evt;
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evt.evt_type = BLE_BPS_EVT_INDICATION_CONFIRMED;
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p_bps->evt_handler(p_bps, &evt);
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}
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}
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void ble_bps_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
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{
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ble_bps_t * p_bps = (ble_bps_t *)p_context;
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switch (p_ble_evt->header.evt_id)
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{
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case BLE_GAP_EVT_CONNECTED:
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on_connect(p_bps, p_ble_evt);
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break;
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case BLE_GAP_EVT_DISCONNECTED:
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on_disconnect(p_bps, p_ble_evt);
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break;
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case BLE_GATTS_EVT_WRITE:
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on_write(p_bps, p_ble_evt);
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break;
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case BLE_GATTS_EVT_HVC:
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on_hvc(p_bps, p_ble_evt);
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break;
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default:
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// No implementation needed.
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break;
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}
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}
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/**@brief Function for encoding a Blood Pressure Measurement.
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*
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* @param[in] p_bps Blood Pressure Service structure.
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* @param[in] p_bps_meas Measurement to be encoded.
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* @param[out] p_encoded_buffer Buffer where the encoded data will be written.
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*
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* @return Size of encoded data.
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*/
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static uint8_t bps_measurement_encode(ble_bps_t * p_bps,
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ble_bps_meas_t * p_bps_meas,
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uint8_t * p_encoded_buffer)
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{
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uint8_t flags = 0;
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uint8_t len = 1;
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uint16_t encoded_sfloat;
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// Set measurement units flag
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if (p_bps_meas->blood_pressure_units_in_kpa)
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{
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flags |= BPS_MEAS_BLOOD_PRESSURE_UNITS_FLAG_BIT;
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}
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// Blood Pressure Measurement - Systolic
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encoded_sfloat = ((p_bps_meas->blood_pressure_systolic.exponent << 12) & 0xF000) |
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((p_bps_meas->blood_pressure_systolic.mantissa << 0) & 0x0FFF);
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len += uint16_encode(encoded_sfloat, &p_encoded_buffer[len]);
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// Blood Pressure Measurement - Diastolic
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encoded_sfloat = ((p_bps_meas->blood_pressure_diastolic.exponent << 12) & 0xF000) |
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((p_bps_meas->blood_pressure_diastolic.mantissa << 0) & 0x0FFF);
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len += uint16_encode(encoded_sfloat, &p_encoded_buffer[len]);
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// Blood Pressure Measurement - Mean Arterial Pressure
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encoded_sfloat = ((p_bps_meas->mean_arterial_pressure.exponent << 12) & 0xF000) |
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((p_bps_meas->mean_arterial_pressure.mantissa << 0) & 0x0FFF);
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len += uint16_encode(encoded_sfloat, &p_encoded_buffer[len]);
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// Time Stamp field
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if (p_bps_meas->time_stamp_present)
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{
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flags |= BPS_MEAS_TIME_STAMP_FLAG_BIT;
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len += ble_date_time_encode(&p_bps_meas->time_stamp, &p_encoded_buffer[len]);
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}
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// Pulse Rate
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if (p_bps_meas->pulse_rate_present)
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{
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flags |= BPS_MEAS_PULSE_RATE_FLAG_BIT;
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encoded_sfloat = ((p_bps_meas->pulse_rate.exponent << 12) & 0xF000) |
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((p_bps_meas->pulse_rate.mantissa << 0) & 0x0FFF);
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len += uint16_encode(encoded_sfloat, &p_encoded_buffer[len]);
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}
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// User ID
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if (p_bps_meas->user_id_present)
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{
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flags |= BPS_MEAS_USER_ID_FLAG_BIT;
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p_encoded_buffer[len++] = p_bps_meas->user_id;
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}
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// Measurement Status
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if (p_bps_meas->measurement_status_present)
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{
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flags |= BPS_MEAS_MEASUREMENT_STATUS_FLAG_BIT;
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len += uint16_encode(p_bps_meas->measurement_status, &p_encoded_buffer[len]);
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}
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// Flags field
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p_encoded_buffer[0] = flags;
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return len;
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}
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uint32_t ble_bps_init(ble_bps_t * p_bps, ble_bps_init_t const * p_bps_init)
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{
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VERIFY_PARAM_NOT_NULL(p_bps);
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VERIFY_PARAM_NOT_NULL(p_bps_init);
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VERIFY_PARAM_NOT_NULL(p_bps_init->p_gatt_queue);
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uint32_t err_code;
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uint8_t init_value_encoded[MAX_BPM_LEN];
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uint8_t initial_feature_len;
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ble_bps_meas_t initial_bpm;
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ble_uuid_t ble_uuid;
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ble_add_char_params_t add_char_params;
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// Initialize service structure
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p_bps->evt_handler = p_bps_init->evt_handler;
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p_bps->error_handler = p_bps_init->error_handler;
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p_bps->p_gatt_queue = p_bps_init->p_gatt_queue;
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p_bps->conn_handle = BLE_CONN_HANDLE_INVALID;
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p_bps->feature = p_bps_init->feature;
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// Add service
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BLE_UUID_BLE_ASSIGN(ble_uuid, BLE_UUID_BLOOD_PRESSURE_SERVICE);
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err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY, &ble_uuid, &p_bps->service_handle);
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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// Add measurement characteristic
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memset(&initial_bpm, 0, sizeof(initial_bpm));
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memset(&add_char_params, 0, sizeof(add_char_params));
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add_char_params.uuid = BLE_UUID_BLOOD_PRESSURE_MEASUREMENT_CHAR;
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add_char_params.max_len = MAX_BPM_LEN;
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add_char_params.is_var_len = true;
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add_char_params.init_len = bps_measurement_encode(p_bps, &initial_bpm, init_value_encoded);
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add_char_params.p_init_value = init_value_encoded;
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add_char_params.char_props.indicate = 1;
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add_char_params.cccd_write_access = p_bps_init->bp_cccd_wr_sec;
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err_code = characteristic_add(p_bps->service_handle, &add_char_params, &p_bps->meas_handles);
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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// Add feature characteristic
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initial_feature_len = uint16_encode(p_bps_init->feature, init_value_encoded);
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memset(&add_char_params, 0, sizeof(add_char_params));
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add_char_params.uuid = BLE_UUID_BLOOD_PRESSURE_FEATURE_CHAR;
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add_char_params.max_len = initial_feature_len;
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add_char_params.init_len = initial_feature_len;
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add_char_params.p_init_value = init_value_encoded;
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add_char_params.char_props.read = 1;
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add_char_params.read_access = p_bps_init->bp_feature_rd_sec;
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err_code = characteristic_add(p_bps->service_handle, &add_char_params, &p_bps->feature_handles);
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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return NRF_SUCCESS;
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}
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uint32_t ble_bps_measurement_send(ble_bps_t * p_bps, ble_bps_meas_t * p_bps_meas)
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{
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uint32_t err_code;
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// Send value if connected
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if (p_bps->conn_handle != BLE_CONN_HANDLE_INVALID)
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{
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uint8_t encoded_bps_meas[MAX_BPM_LEN];
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uint16_t len;
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nrf_ble_gq_req_t bps_req;
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len = bps_measurement_encode(p_bps, p_bps_meas, encoded_bps_meas);
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memset(&bps_req, 0, sizeof(nrf_ble_gq_req_t));
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bps_req.type = NRF_BLE_GQ_REQ_GATTS_HVX;
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bps_req.error_handler.cb = gatt_error_handler;
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bps_req.error_handler.p_ctx = p_bps;
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bps_req.params.gatts_hvx.handle = p_bps->meas_handles.value_handle;
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bps_req.params.gatts_hvx.offset = 0;
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bps_req.params.gatts_hvx.p_data = encoded_bps_meas;
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bps_req.params.gatts_hvx.p_len = &len;
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bps_req.params.gatts_hvx.type = BLE_GATT_HVX_INDICATION;
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err_code = nrf_ble_gq_item_add(p_bps->p_gatt_queue, &bps_req, p_bps->conn_handle);
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}
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else
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{
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err_code = NRF_ERROR_INVALID_STATE;
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}
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return err_code;
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}
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uint32_t ble_bps_is_indication_enabled(ble_bps_t * p_bps, bool * p_indication_enabled)
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{
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uint32_t err_code;
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uint8_t cccd_value_buf[BLE_CCCD_VALUE_LEN];
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ble_gatts_value_t gatts_value;
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// Initialize value struct.
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memset(&gatts_value, 0, sizeof(gatts_value));
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gatts_value.len = BLE_CCCD_VALUE_LEN;
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gatts_value.offset = 0;
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gatts_value.p_value = cccd_value_buf;
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err_code = sd_ble_gatts_value_get(p_bps->conn_handle,
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p_bps->meas_handles.cccd_handle,
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&gatts_value);
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if (err_code == NRF_SUCCESS)
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{
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*p_indication_enabled = ble_srv_is_indication_enabled(cccd_value_buf);
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}
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if (err_code == BLE_ERROR_GATTS_SYS_ATTR_MISSING)
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{
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*p_indication_enabled = false;
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return NRF_SUCCESS;
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}
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return err_code;
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}
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#endif // NRF_MODULE_ENABLED(BLE_BPS)
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