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- /**
- * Copyright (c) 2016 - 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 <stdint.h>
- #include <string.h>
- #include <time.h>
- #include "ble.h"
- #include "ble_srv_common.h"
- #include "nrf_ble_cgms.h"
- #include "cgms_sst.h"
- void sst_decode(ble_cgms_sst_t * p_sst, const uint8_t * p_data, const uint16_t len)
- {
- uint32_t index;
- if (len != NRF_BLE_CGMS_SST_LEN)
- {
- return;
- }
- index = ble_date_time_decode(&p_sst->date_time, p_data);
- p_sst->time_zone = p_data[index++];
- p_sst->dst = p_data[index++];
- }
- void convert_ble_time_c_time(ble_cgms_sst_t * p_sst, struct tm * p_c_time_date)
- {
- p_c_time_date->tm_sec = p_sst->date_time.seconds;
- p_c_time_date->tm_min = p_sst->date_time.minutes;
- p_c_time_date->tm_hour = p_sst->date_time.hours;
- p_c_time_date->tm_mday = p_sst->date_time.day;
- p_c_time_date->tm_mon = p_sst->date_time.month;
- p_c_time_date->tm_year = p_sst->date_time.year - 1900;
- // Ignore daylight saving for this conversion.
- p_c_time_date->tm_isdst = 0;
- }
- void calc_sst(uint16_t offset, struct tm * p_c_time_date)
- {
- time_t c_time_in_sec;
- c_time_in_sec = mktime(p_c_time_date);
- c_time_in_sec = c_time_in_sec - (offset * 60);
- *p_c_time_date = *(localtime(&c_time_in_sec));
- if (p_c_time_date->tm_isdst == 1)
- {
- // Daylight saving time is not used and must be removed.
- p_c_time_date->tm_hour = p_c_time_date->tm_hour - 1;
- p_c_time_date->tm_isdst = 0;
- }
- }
- static void convert_c_time_ble_time(ble_cgms_sst_t * p_sst, struct tm * p_c_time_date)
- {
- p_sst->date_time.seconds = p_c_time_date->tm_sec;
- p_sst->date_time.minutes = p_c_time_date->tm_min;
- p_sst->date_time.hours = p_c_time_date->tm_hour;
- p_sst->date_time.day = p_c_time_date->tm_mday;
- p_sst->date_time.month = p_c_time_date->tm_mon;
- p_sst->date_time.year = p_c_time_date->tm_year + 1900;
- }
- static uint8_t sst_encode(ble_cgms_sst_t * p_sst, uint8_t * p_encoded_sst)
- {
- uint8_t len;
- len = ble_date_time_encode(&p_sst->date_time, p_encoded_sst);
- p_encoded_sst[len++] = p_sst->time_zone;
- p_encoded_sst[len++] = p_sst->dst;
- return len;
- }
- static ret_code_t cgm_update_sst(nrf_ble_cgms_t * p_cgms, ble_gatts_evt_write_t const * p_evt_write)
- {
- ble_cgms_sst_t sst;
- struct tm c_time_and_date;
- memset(&sst, 0, sizeof(ble_cgms_sst_t));
- sst_decode(&sst, p_evt_write->data, p_evt_write->len);
- convert_ble_time_c_time(&sst, &c_time_and_date);
- calc_sst(p_cgms->sensor_status.time_offset, &c_time_and_date);
- convert_c_time_ble_time(&sst, &c_time_and_date);
- return cgms_sst_set(p_cgms, &sst);
- }
- /**@brief Function for handling the Glucose session start time write event.
- *
- * @param[in] p_cgms Service instance.
- * @param[in] p_evt_write WRITE event to be handled.
- */
- static void on_sst_value_write(nrf_ble_cgms_t * p_cgms, ble_gatts_evt_write_t const * p_evt_write)
- {
- ble_gatts_rw_authorize_reply_params_t auth_reply;
- uint32_t err_code;
- memset(&auth_reply, 0, sizeof(auth_reply));
- auth_reply.type = BLE_GATTS_AUTHORIZE_TYPE_WRITE;
- auth_reply.params.write.update = 1;
- auth_reply.params.write.gatt_status = BLE_GATT_STATUS_SUCCESS;
- err_code = sd_ble_gatts_rw_authorize_reply(p_cgms->conn_handle, &auth_reply);
- if (err_code != NRF_SUCCESS)
- {
- if (p_cgms->error_handler != NULL)
- {
- p_cgms->error_handler(err_code);
- }
- }
- err_code = cgm_update_sst(p_cgms, p_evt_write);
- if (err_code != NRF_SUCCESS)
- {
- if (p_cgms->error_handler != NULL)
- {
- p_cgms->error_handler(err_code);
- }
- }
- }
- /**@brief Function for adding a characteristic for the Session Start Time.
- *
- * @param[in] p_cgms Service instance.
- *
- * @return NRF_SUCCESS if characteristic was successfully added, otherwise an error code.
- */
- ret_code_t cgms_sst_char_add(nrf_ble_cgms_t * p_cgms)
- {
- ble_add_char_params_t add_char_params;
- uint8_t init_value[NRF_BLE_CGMS_SST_LEN] = {0};
- memset(&add_char_params, 0, sizeof(add_char_params));
- add_char_params.uuid = BLE_UUID_CGM_SESSION_START_TIME;
- add_char_params.max_len = NRF_BLE_CGMS_SST_LEN;
- add_char_params.init_len = NRF_BLE_CGMS_SST_LEN;
- add_char_params.p_init_value = init_value;
- add_char_params.read_access = SEC_JUST_WORKS;
- add_char_params.write_access = SEC_JUST_WORKS;
- add_char_params.is_defered_write = 1;
- add_char_params.char_props.write = true;
- add_char_params.char_props.read = true;
- return characteristic_add(p_cgms->service_handle,
- &add_char_params,
- &p_cgms->char_handles.sst);
- }
- ret_code_t cgms_sst_set(nrf_ble_cgms_t * p_cgms, ble_cgms_sst_t * p_sst)
- {
- uint16_t conn_handle;
- uint16_t value_handle;
- ble_gatts_value_t sst_val;
- uint8_t encoded_start_session_time[NRF_BLE_CGMS_SST_LEN];
- uint8_t gatts_value_set_len = 0;
- gatts_value_set_len = sst_encode(p_sst, encoded_start_session_time);
- conn_handle = p_cgms->conn_handle;
- value_handle = p_cgms->char_handles.sst.value_handle;
- memset(&sst_val, 0, sizeof(ble_gatts_value_t));
- sst_val.len = gatts_value_set_len;
- sst_val.p_value = encoded_start_session_time;
- sst_val.offset = 0;
- return (sd_ble_gatts_value_set(conn_handle, value_handle, &sst_val));
- }
- void cgms_sst_on_rw_auth_req(nrf_ble_cgms_t * p_cgms,
- ble_gatts_evt_rw_authorize_request_t const * p_auth_req)
- {
- if (p_auth_req->type == BLE_GATTS_AUTHORIZE_TYPE_WRITE)
- {
- if (p_auth_req->request.write.handle == p_cgms->char_handles.sst.value_handle)
- {
- on_sst_value_write(p_cgms, &p_auth_req->request.write);
- }
- }
- }
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