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 * Copyright (c) 2012 - 2017, Nordic Semiconductor ASA
 * 
 * All rights reserved.
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 * 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
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 *    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
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/* Attention!
*  To maintain compliance with Nordic Semiconductor ASA’s Bluetooth profile
*  qualification listings, this section of source code must not be modified.
*/
#include "sdk_common.h"
#if NRF_MODULE_ENABLED(BLE_IAS)
#include "ble_ias.h"
#include <string.h>
#include "ble_srv_common.h"


#define INITIAL_ALERT_LEVEL BLE_CHAR_ALERT_LEVEL_NO_ALERT


/**@brief Function for handling the Connect event.
 *
 * @param[in]   p_ias       Immediate Alert Service structure.
 * @param[in]   p_ble_evt   Event received from the BLE stack.
 */
static void on_connect(ble_ias_t * p_ias, ble_evt_t * p_ble_evt)
{
    p_ias->conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
}

/**@brief Function for handling the Write event.
 *
 * @param[in]   p_ias       Immediate Alert Service structure.
 * @param[in]   p_ble_evt   Event received from the BLE stack.
 */
static void on_write(ble_ias_t * p_ias, ble_evt_t * p_ble_evt)
{
    ble_gatts_evt_write_t * p_evt_write = &p_ble_evt->evt.gatts_evt.params.write;

    if ((p_evt_write->handle == p_ias->alert_level_handles.value_handle) && (p_evt_write->len == 1))
    {
        // Alert level written, call application event handler
        ble_ias_evt_t evt;

        evt.evt_type           = BLE_IAS_EVT_ALERT_LEVEL_UPDATED;
        evt.params.alert_level = p_evt_write->data[0];

        p_ias->evt_handler(p_ias, &evt);
    }
}


void ble_ias_on_ble_evt(ble_ias_t * p_ias, ble_evt_t * p_ble_evt)
{
    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            on_connect(p_ias, p_ble_evt);
            break;

        case BLE_GATTS_EVT_WRITE:
            on_write(p_ias, p_ble_evt);
            break;

        default:
            // No implementation needed.
            break;
    }
}


/**@brief Function for adding Alert Level characteristics.
 *
 * @param[in]   p_ias        Immediate Alert Service structure.
 * @param[in]   p_ias_init   Information needed to initialize the service.
 *
 * @return      NRF_SUCCESS on success, otherwise an error code.
 */
static uint32_t alert_level_char_add(ble_ias_t * p_ias)
{
    ble_gatts_char_md_t char_md;
    ble_gatts_attr_t    attr_char_value;
    ble_uuid_t          ble_uuid;
    ble_gatts_attr_md_t attr_md;
    uint8_t             initial_alert_level;

    memset(&char_md, 0, sizeof(char_md));

    char_md.char_props.write_wo_resp = 1;
    char_md.p_char_user_desc         = NULL;
    char_md.p_char_pf                = NULL;
    char_md.p_user_desc_md           = NULL;
    char_md.p_cccd_md                = NULL;
    char_md.p_sccd_md                = NULL;

    BLE_UUID_BLE_ASSIGN(ble_uuid, BLE_UUID_ALERT_LEVEL_CHAR);

    memset(&attr_md, 0, sizeof(attr_md));

    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&attr_md.write_perm);

    attr_md.vloc    = BLE_GATTS_VLOC_STACK;
    attr_md.rd_auth = 0;
    attr_md.wr_auth = 0;
    attr_md.vlen    = 0;

    memset(&attr_char_value, 0, sizeof(attr_char_value));
    initial_alert_level = INITIAL_ALERT_LEVEL;

    attr_char_value.p_uuid    = &ble_uuid;
    attr_char_value.p_attr_md = &attr_md;
    attr_char_value.init_len  = sizeof (uint8_t);
    attr_char_value.init_offs = 0;
    attr_char_value.max_len   = sizeof (uint8_t);
    attr_char_value.p_value   = &initial_alert_level;

    return sd_ble_gatts_characteristic_add(p_ias->service_handle,
                                           &char_md,
                                           &attr_char_value,
                                           &p_ias->alert_level_handles);
}


uint32_t ble_ias_init(ble_ias_t * p_ias, const ble_ias_init_t * p_ias_init)
{
    uint32_t   err_code;
    ble_uuid_t ble_uuid;

    // Initialize service structure
    if (p_ias_init->evt_handler == NULL)
    {
        return NRF_ERROR_INVALID_PARAM;
    }
    p_ias->evt_handler = p_ias_init->evt_handler;

    // Add service
    BLE_UUID_BLE_ASSIGN(ble_uuid, BLE_UUID_IMMEDIATE_ALERT_SERVICE);

    err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY,
                                        &ble_uuid,
                                        &p_ias->service_handle);

    if (err_code != NRF_SUCCESS)
    {
        return err_code;
    }

    // Add alert level characteristic
    return alert_level_char_add(p_ias);
}


uint32_t ble_ias_alert_level_get(ble_ias_t * p_ias, uint8_t * p_alert_level)
{
    ble_gatts_value_t gatts_value;

    // Initialize value struct.
    memset(&gatts_value, 0, sizeof(gatts_value));

    gatts_value.len     = sizeof(uint8_t);
    gatts_value.offset  = 0;
    gatts_value.p_value = p_alert_level;

    return sd_ble_gatts_value_get(p_ias->conn_handle,
                                  p_ias->alert_level_handles.value_handle,
                                  &gatts_value);
}
#endif // NRF_MODULE_ENABLED(BLE_IAS)
