How to get full Service UUID from given BASE UUID

[davidm]

Hi all

I am trying to pair nrf52840 (as a central) with ESP32 (as peripheral).

 Now I want to get the service uuid so that i can pass to advertising service in ESP32 code.How do I get the full-service UUID, I see that in the ble_lbs_c service  UUID is declared as 0x1523 characteristic  UUID as 0x1525 and LBS_UUID_BASE {0x23, 0xD1, 0xBC, 0xEA, 0x5F, 0x78, 0x23, 0x15, 0xDE, 0xEF, 0x12, 0x12, 0x00, 0x00, 0x00, 0x00}

I tried to pass the service uuid as #define SERVICE_UUID   "23151212EFDE1523785FEABCD1" on ESP32 program but that didnt work. What is the exact order of the UUID? If you need  details on esp32 code here is the example esp32 program

I am using ble_app_blinky_c example on nrf52840.

Thank you in advance

[Edvin]

Hello,

I am not sure how the ESP libraries work, or how they set up their UUID. Have you tried looking at this device using nRF Connect? Whatever the outcome of the UUID is when you set it like that, you can compare it to the scanned UUID (if the ESP advertises using it's UUID at all). You can download the app version of nRF Connect on google play store or the iOS App Store. Alternatively, you can use the nRF Connect for Desktop (which requires an extra nRF DK/dongle).

[davidm]

Hi Edvin

Thank you for your quick response but I think there might be a misunderstanding. I am trying to find out, what the full-service UUID that will be formed by the Central(in this case Nrf52840) not ESP32.Once I get that I would use it , for advertising in ESP32 code.

Thank you again.

[Edvin]

Please look at the scan_init in ble_app_uart_c, as this is looking for a specific UUID, which you can try to modify to match your UUID. Remember to also set NRF_BLE_SCAN_UUID_CNT to 1 in sdk_config.h.

If you insert the correct UUID, does nrf_ble_scan_connect_with_target() get called inside the nrf_ble_scan_on_adv_report() in nrf_ble_scan.c?

[davidm]

Hi Edvin

I did some digging a bit. It seems like adv_name_compare() in nrf_ble_scan.c returns false. To be specific i think ble_advdata_name_find returns false. I tried to log NRF_LOG_DEBUG("adv_data %s",p_adv_report->data.p_data) it prints out  "ESP32  #N_x...." with some strange characters after that.

I have tried with NRF52 peripheral board which connects successfully, but the log above doesn't print anything, and ble_advdata_name_find returns true. 

What could be the cause of returning false (in esp32 peripheral case) ?

static bool adv_name_compare(ble_gap_evt_adv_report_t const * p_adv_report,
                             nrf_ble_scan_t     const * const p_scan_ctx)
{
    nrf_ble_scan_name_filter_t const * p_name_filter = &p_scan_ctx->scan_filters.name_filter;
    uint8_t                            counter       =
        p_scan_ctx->scan_filters.name_filter.name_cnt;
    uint8_t  index;
    uint16_t data_len;

    data_len = p_adv_report->data.len;

    // Compare the name found with the name filter.
    for (index = 0; index < counter; index++)
    {
        if (ble_advdata_name_find(p_adv_report->data.p_data,
                                  data_len,
                                  p_name_filter->target_name[index]))
        {
            return true;
        }
    }

    return false;
}

[Edvin]

Can you show me what the entire advertising pack looks like?

for(uint i=0; i<data_len; i++)
{
    NRF_LOG_RAW_INFO("%02x:", p_adv_report->data.p_data);
}

 

davidm said:

What could be the cause of returning false (in esp32 peripheral case) ?

 The obvious answer is that ble_advdata_name_find returns false. 

Try to print out the entire p_data, and see what it looks like, then you can analyze ble_advdata_name find, to see why it returns false. 

But let me see the entire advertising data packet that contains "ESP32 #N_x...".

BR,
Edvin

[davidm]

Edvin,

NRF_LOG_DEBUG("%s",  p_adv_report->data.p_data); prints -> ESP32
#Ѽê_x#Þï# 

NRF_LOG_RAW_INFO("raw data %s:", p_adv_report->data.p_data);prints -> ESP32

NRF_LOG_RAW_INFO("%02x:", p_adv_report->data.p_data); prints-> 20002C28
By the way "ESP32" you see in the logs, is the name I configured on esp32 peripheral board to be the name of the device.

[Edvin]

Can you please try the snippet that I used in the previous reply?

What I wanted you to see is the different flags that are used in an advertising packet, which you can read about here. In the section "Example 1" you can see how the name is behind the flag 0x09. This is why I wanted you to print all the bytes in hexadecimal format (%02x), so that I could see what your packet contains. When you print using %s, it will only print the ascii values of the packet. Your advertising data doesn't start with ESP32. There has to be some flags before that. 

The last one you printed:

 

davidm said:

NRF_LOG_RAW_INFO("%02x:", p_adv_report->data.p_data); prints-> 20002C28

 Will only print one byte. 

[davidm]

Oh, my apologies and Thank you for your patience...Here is what I get when I iterate through p_adv_report->data.p_data .   02:01:06:06:09:45:53:50:33:32:02:0A:03:11:07:23:D1:BC:EA:5F:78:23:15:DE:EF:12:12:23:15:00:00

[Edvin]

Ok. comparing this to the link in the previous reply, and the values from here.

I'll try to break it down:

02:01:06: 													Len:2, 	type: flags										value: 0x06
06:09:45:53:50:33:32:										Len:6,	type: complete name								value: ESP32 (ascii)
02:0A:03:													Len:2,	type: TX power level							value: 03
11:07:23:D1:BC:EA:5F:78:23:15:DE:EF:12:12:23:15:00:00		Len:17,	type: complete list of 128bit service UUIDs		value: UUID

So, the advertising name of the device is "ESP32". And the service UUID is the bottom one.

Please remind me how you set the scan filter.

By the way, if you are just using these two devices, and don't really need anything generic, you can just use:

if ((p_adv_report->data.p_data[5] == 0x45) &&
    (p_adv_report->data.p_data[6] == 0x53) &&
    (p_adv_report->data.p_data[7] == 0x50) &&
    (p_adv_report->data.p_data[8] == 0x33) &&
    (p_adv_report->data.p_data[9] == 0x32))
    {
        filter_match = true;
    }

It is quite hardcoded, but it will connect to this device.

[davidm]

Hi Edvin

Thank you for the breakdown. I still need to read about Scanning and data structuring to get a better understanding.

Regarding matching, Ideally, there would be multiple devices trying to connect with the peripheral(Esp32) so hardcoding, would not work in my case.

 I am using ble_app_blinky_c central example looking in the code snipet below  ,it does get inside name_filter_enabled but  adv_short_name_compare(p_adv_report, p_scan_ctx) is always false. 

#if (NRF_BLE_SCAN_NAME_CNT > 0)
    // Check the name filter.
    if (name_filter_enabled)
    {
        filter_cnt++;
        if (adv_name_compare(p_adv_report, p_scan_ctx))
        {
            filter_match_cnt++;

            // Information about the filters matched.
            scan_evt.params.filter_match.filter_match.name_filter_match = true;
            is_filter_matched = true;
        }
    }
#endif

I have also  attached the nrf_ble_scan_c below.

Fullscreen nrf_ble_scan.c Download

/**
 * Copyright (c) 2018, 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(NRF_BLE_SCAN)

#include "sdk_config.h"
#include <stdlib.h>

#include "nrf_ble_scan.h"

#include <string.h>
#include "app_error.h"
#include "nrf_assert.h"
#include "sdk_macros.h"
#include "ble_advdata.h"

#define NRF_LOG_MODULE_NAME ble_scan
#include "nrf_log.h"
NRF_LOG_MODULE_REGISTER();


/**@brief Function for establishing the connection with a device.
 *
 * @details Connection is established if @ref NRF_BLE_SCAN_EVT_FILTER_MATCH
 *          or @ref NRF_BLE_SCAN_EVT_WHITELIST_ADV_REPORT occurs and the module was
 *          initialized in the automatic connection mode. This function can generate an event
 *          to the main application when @ref sd_ble_gap_connect is used inside the function and it returns value
 *          that is different than @ref NRF_SUCCESS.
 *
 * @param[in] p_scan_ctx   Pointer to the Scanning Module instance.
 * @param[in] p_adv_report Advertising data.
 */
static void nrf_ble_scan_connect_with_target(nrf_ble_scan_t           const * const p_scan_ctx,
                                             ble_gap_evt_adv_report_t const * const p_adv_report)
{
    ret_code_t err_code;
    scan_evt_t scan_evt;

    // For readability.
    ble_gap_addr_t const        * p_addr        = &p_adv_report->peer_addr;
    ble_gap_scan_params_t const * p_scan_params = &p_scan_ctx->scan_params;
    ble_gap_conn_params_t const * p_conn_params = &p_scan_ctx->conn_params;
    uint8_t                       con_cfg_tag   = p_scan_ctx->conn_cfg_tag;

    // Return if the automatic connection is disabled.
    if (!p_scan_ctx->connect_if_match)
    {
        return;
    }

    // Stop scanning.
    nrf_ble_scan_stop();

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

    // Establish connection.
    err_code = sd_ble_gap_connect(p_addr,
                                  p_scan_params,
                                  p_conn_params,
                                  con_cfg_tag);

    NRF_LOG_DEBUG("Connecting");

    scan_evt.scan_evt_id                    = NRF_BLE_SCAN_EVT_CONNECTING_ERROR;
    scan_evt.params.connecting_err.err_code = err_code;

    NRF_LOG_DEBUG("Connection status: %d", err_code);

    // If an error occurred, send an event to the event handler.
    if ((err_code != NRF_SUCCESS) && (p_scan_ctx->evt_handler != NULL))
    {
        p_scan_ctx->evt_handler(&scan_evt);
    }

}


/**@brief Function for decoding the BLE address type.
 *
 * @param[in] p_addr 	The BLE address.
 *
 * @return    			Address type, or an error if the address type is incorrect, that is it does not match @ref BLE_GAP_ADDR_TYPES.
 *
 */
static uint16_t nrf_ble_scan_address_type_decode(uint8_t const * p_addr)
{
    uint8_t addr_type = p_addr[0];

    // See Bluetooth Core Specification Vol 6, Part B, section 1.3.
    addr_type  = addr_type >> 6;
    addr_type &= 0x03;

    // Check address type.
    switch (addr_type)
    {
        case 0:
        {
            return BLE_GAP_ADDR_TYPE_RANDOM_PRIVATE_NON_RESOLVABLE;
        }

        case 1:
        {
            return BLE_GAP_ADDR_TYPE_PUBLIC;
        }

        case 2:
        {
            return BLE_GAP_ADDR_TYPE_RANDOM_PRIVATE_RESOLVABLE;
        }

        case 3:
        {
            return BLE_GAP_ADDR_TYPE_RANDOM_STATIC;
        }

        default:
        {
            return BLE_ERROR_GAP_INVALID_BLE_ADDR;
        }
    }
}


#if (NRF_BLE_SCAN_FILTER_ENABLE == 1)
#if (NRF_BLE_SCAN_ADDRESS_CNT > 0)

/**@brief Function for searching for the provided address in the advertisement packets.
 *
 * @details Use this function to parse the received advertising data for the provided address.
 *        
 *
 * @param[in]   p_adv_report   Advertising data to parse.
 * @param[in]   p_addr         Address to search for. The address length must correspond to @ref BLE_GAP_ADDR_LEN.
 *
 * @return   True if the provided address was found, false otherwise.
 */
static bool find_peer_addr(ble_gap_evt_adv_report_t const * const p_adv_report,
                           ble_gap_addr_t const                 * p_addr)
{
    if (p_addr->addr_type == p_adv_report->peer_addr.addr_type)
    {
        // Compare addresses.
        if (memcmp(p_addr->addr,
                   p_adv_report->peer_addr.addr,
                   sizeof(p_adv_report->peer_addr.addr)) == 0)
        {
            return true;
        }
    }
    return false;
}


/** @brief Function for comparing the provided address with the addresses of the advertising devices.
 *
 * @param[in] p_adv_report    Advertising data to parse.
 * @param[in] p_scan_ctx      Pointer to the Scanning Module instance.
 *
 * @retval True when the address matches with the addresses of the advertising devices. False otherwise.
 */
static bool adv_addr_compare(ble_gap_evt_adv_report_t const * const p_adv_report,
                             nrf_ble_scan_t const * const           p_scan_ctx)
{
    ble_gap_addr_t const * p_addr  = p_scan_ctx->scan_filters.addr_filter.target_addr;
    uint8_t                counter = p_scan_ctx->scan_filters.addr_filter.addr_cnt;

    for (uint8_t index = 0; index < counter; index++)
    {
        // Search for address.
        if (find_peer_addr(p_adv_report, &p_addr[index]))
        {
            return true;
        }
    }

    return false;
}


/**@brief Function for adding target address to the scanning filter.
 *
 * @param[in]     p_addr            Target address in the format required by the SoftDevice. If you need to convert the address, use @ref nrf_ble_scan_copy_addr_to_sd_gap_addr. The address length must correspond to @ref BLE_GAP_ADDR_LEN.
 * @param[in,out] p_scan_ctx        Pointer to the Scanning Module instance.
 *
 * @retval NRF_SUCCESS                    If the filter is added successfully or if you try to add a filter that was already added before.
 * @retval NRF_ERROR_NO_MEMORY            If the number of available filters is exceeded.
 * @retval BLE_ERROR_GAP_INVALID_BLE_ADDR If the BLE address type is invalid.
 */
static ret_code_t nrf_ble_scan_addr_filter_add(nrf_ble_scan_t * const p_scan_ctx,
                                               uint8_t        const * p_addr)
{
    ble_gap_addr_t * p_addr_filter = p_scan_ctx->scan_filters.addr_filter.target_addr;
    uint8_t        * p_counter     = &p_scan_ctx->scan_filters.addr_filter.addr_cnt;
    uint8_t          index;
    uint16_t         addr_type;
    uint8_t          temp_addr[BLE_GAP_ADDR_LEN];

    // If no memory for filter.
    if (*p_counter >= NRF_BLE_SCAN_ADDRESS_CNT)
    {
        return NRF_ERROR_NO_MEM;
    }

    // Check for duplicated filter.
    for (index = 0; index < NRF_BLE_SCAN_ADDRESS_CNT; index++)
    {
        if (!memcmp(p_addr_filter[index].addr, p_addr, BLE_GAP_ADDR_LEN))
        {
            return NRF_SUCCESS;
        }
    }

    // Inverting the address.
    for (uint8_t i = 0; i < BLE_GAP_ADDR_LEN; i++)
    {
        temp_addr[i] = p_addr[(BLE_GAP_ADDR_LEN - 1) - i];
    }

    // Decode address type.
    addr_type = nrf_ble_scan_address_type_decode(temp_addr);

    if (addr_type == BLE_ERROR_GAP_INVALID_BLE_ADDR)
    {
        return BLE_ERROR_GAP_INVALID_BLE_ADDR;
    }

    // Add target address to filter.
    p_addr_filter[*p_counter].addr_type = (uint8_t)addr_type;

    for (uint8_t i = 0; i < BLE_GAP_ADDR_LEN; i++)
    {
        p_addr_filter[*p_counter].addr[i] = p_addr[i];
    }

    NRF_LOG_DEBUG("Filter set on address type %i, address 0x",
                  p_addr_filter[*p_counter].addr_type);

    for (index = 0; index < BLE_GAP_ADDR_LEN; index++)
    {
        NRF_LOG_DEBUG("%x", p_addr_filter[*p_counter].addr[index]);
    }

    NRF_LOG_DEBUG("\n\r");

    // Increase the address filter counter.
    *p_counter += 1;

    return NRF_SUCCESS;
}


#endif // NRF_BLE_SCAN_ADDRESS_CNT


#if (NRF_BLE_SCAN_NAME_CNT > 0)
/** @brief Function for comparing the provided name with the advertised name.
 *
 * @param[in] p_adv_report    Advertising data to parse.
 * @param[in] p_scan_ctx      Pointer to the Scanning Module instance.
 *
 * @retval True when the names match. False otherwise.
 */
static bool adv_name_compare(ble_gap_evt_adv_report_t const * p_adv_report,
                             nrf_ble_scan_t     const * const p_scan_ctx)
{
    nrf_ble_scan_name_filter_t const * p_name_filter = &p_scan_ctx->scan_filters.name_filter;
    uint8_t                            counter       =
        p_scan_ctx->scan_filters.name_filter.name_cnt;
    uint8_t  index;
    uint16_t data_len;

    data_len = p_adv_report->data.len;

    // Compare the name found with the name filter.
    for (index = 0; index < counter; index++)
    {
        if (ble_advdata_name_find(p_adv_report->data.p_data,
                                  data_len,
                                  p_name_filter->target_name[index]))
        {
            return true;
        }
    }

    return false;
}


/**@brief Function for adding name of the peripheral to the scanning filter.
 *
 * @param[in]     p_name            Peripheral name.
 * @param[in,out] p_scan_ctx        Pointer to the Scanning Module instance.
 *
 * @retval NRF_SUCCESS              If the filter is added successfully or if you try to add a filter that was already added before.
 * @retval NRF_ERROR_NULL           If a NULL pointer is passed as input.
 * @retval NRF_ERROR_DATA_SIZE      If the name filter length is too long. The maximum filter name length corresponds to @ref NRF_BLE_SCAN_NAME_MAX_LEN.
 * @retval NRF_ERROR_NO_MEMORY      If the number of available filters is exceeded.
 */
static ret_code_t nrf_ble_scan_name_filter_add(nrf_ble_scan_t * const p_scan_ctx,
                                               char           const * p_name)
{
    uint8_t   index;
    uint8_t * counter  = &p_scan_ctx->scan_filters.name_filter.name_cnt;
    uint8_t   name_len = strlen(p_name);

    // Check the name length.
    if ((name_len == 0) || (name_len > NRF_BLE_SCAN_NAME_MAX_LEN))
    {
        return NRF_ERROR_DATA_SIZE;
    }

    // If no memory for filter.
    if (*counter >= NRF_BLE_SCAN_NAME_CNT)
    {
        return NRF_ERROR_NO_MEM;
    }

    // Check for duplicated filter.
    for (index = 0; index < NRF_BLE_SCAN_NAME_CNT; index++)
    {
        if (!strcmp(p_scan_ctx->scan_filters.name_filter.target_name[index], p_name))
        {
            return NRF_SUCCESS;
        }
    }

    // Add name to filter.
    memcpy(p_scan_ctx->scan_filters.name_filter.target_name[(*counter)++],
           p_name,
           strlen(p_name));

    NRF_LOG_DEBUG("Adding filter on %s name", p_name);

    return NRF_SUCCESS;
}


#endif // NRF_BLE_SCAN_NAME_CNT


#if (NRF_BLE_SCAN_SHORT_NAME_CNT > 0)
/** @brief Function for comparing the provided short name with the advertised short name.
 *
 * @param[in] p_adv_report    Advertising data to parse.
 * @param[in] p_scan_ctx      Pointer to the Scanning Module instance.
 *
 * @retval True when the names match. False otherwise.
 */
static bool adv_short_name_compare(ble_gap_evt_adv_report_t const * const p_adv_report,
                                   nrf_ble_scan_t           const * const p_scan_ctx)
{
    nrf_ble_scan_short_name_filter_t const * p_name_filter =
        &p_scan_ctx->scan_filters.short_name_filter;
    uint8_t  counter = p_scan_ctx->scan_filters.short_name_filter.name_cnt;
    uint8_t  index;
    uint16_t data_len;

    data_len = p_adv_report->data.len;

    // Compare the name found with the name filters.
    for (index = 0; index < counter; index++)
    {
        if (ble_advdata_short_name_find(p_adv_report->data.p_data,
                                        data_len,
                                        p_name_filter->short_name[index].short_target_name,
                                        p_name_filter->short_name[index].short_name_min_len))
        {
            return true;
        }
    }

    return false;
}


/**@brief Function for adding the short name of the peripheral to the scanning filter.
 *
 * @param[in]     p_short_name      Short name of the peripheral.
 * @param[in,out] p_scan_ctx        Pointer to the Scanning Module instance.
 *
 * @retval NRF_SUCCESS              If the filter is added successfully or if you try to add a filter that was already added before.
 * @retval NRF_ERROR_NULL           If a NULL pointer is passed as input.
 * @retval NRF_ERROR_DATA_SIZE      If the name filter length is too long. The maximum filter name length corresponds to @ref NRF_BLE_SCAN_SHORT_NAME_MAX_LEN.
 * @retval NRF_ERROR_NO_MEMORY      If the number of available filters is exceeded.
 */
static ret_code_t nrf_ble_scan_short_name_filter_add(nrf_ble_scan_t            * const p_scan_ctx,
                                                     nrf_ble_scan_short_name_t const * p_short_name)
{
    uint8_t   index;
    uint8_t * p_counter =
        &p_scan_ctx->scan_filters.short_name_filter.name_cnt;
    nrf_ble_scan_short_name_filter_t * p_short_name_filter =
        &p_scan_ctx->scan_filters.short_name_filter;
    uint8_t name_len = strlen(p_short_name->p_short_name);

    // Check the name length.
    if ((name_len == 0) || (name_len > NRF_BLE_SCAN_SHORT_NAME_MAX_LEN))
    {
        return NRF_ERROR_DATA_SIZE;
    }

    // If no memory for filter.
    if (*p_counter >= NRF_BLE_SCAN_SHORT_NAME_CNT)
    {
        return NRF_ERROR_NO_MEM;
    }

    // Check for duplicated filter.
    for (index = 0; index < NRF_BLE_SCAN_SHORT_NAME_CNT; index++)
    {
        if (!strcmp(p_short_name_filter->short_name[index].short_target_name,
                    p_short_name->p_short_name))
        {
            return NRF_SUCCESS;
        }
    }

    // Add name to the filter.
    p_short_name_filter->short_name[(*p_counter)].short_name_min_len =
        p_short_name->short_name_min_len;
    memcpy(p_short_name_filter->short_name[(*p_counter)++].short_target_name,
           p_short_name->p_short_name,
           strlen(p_short_name->p_short_name));

    NRF_LOG_DEBUG("Adding filter on %s name", p_short_name->p_short_name);

    return NRF_SUCCESS;
}


#endif


#if (NRF_BLE_SCAN_UUID_CNT > 0)
/**@brief Function for comparing the provided UUID with the UUID in the advertisement packets.
 *
 * @param[in]   p_adv_report   Advertising data to parse.
 * @param[in]   p_scan_ctx     Pointer to the Scanning Module instance.
 *
 * @return      True if the UUIDs match. False otherwise.
 */
static bool adv_uuid_compare(ble_gap_evt_adv_report_t const * const p_adv_report,
                             nrf_ble_scan_t           const * const p_scan_ctx)
{
    nrf_ble_scan_uuid_filter_t const * p_uuid_filter    = &p_scan_ctx->scan_filters.uuid_filter;
    bool const                         all_filters_mode = p_scan_ctx->scan_filters.all_filters_mode;
    uint8_t const                      counter          =
        p_scan_ctx->scan_filters.uuid_filter.uuid_cnt;
    uint8_t  index;
    uint16_t data_len;
    uint8_t  uuid_match_cnt = 0;

    data_len = p_adv_report->data.len;

    for (index = 0; index < counter; index++)
    {

        if (ble_advdata_uuid_find(p_adv_report->data.p_data,
                                  data_len,
                                  &p_uuid_filter->uuid[index]))
        {
            uuid_match_cnt++;

            // In the normal filter mode, only one UUID is needed to match.
            if (!all_filters_mode)
            {
                break;
            }
        }
        else if (all_filters_mode)
        {
            break;
        }
        else
        {
            // Do nothing.
        }
    }

    // In the multifilter mode, all UUIDs must be found in the advertisement packets.
    if ((all_filters_mode && (uuid_match_cnt == counter)) ||
        ((!all_filters_mode) && (uuid_match_cnt > 0)))
    {
        return true;
    }

    return false;
}


/**@brief Function for adding UUID to the scanning filter.
 *
 * @param[in]     uuid       UUID, 16-bit size.
 * @param[in,out] p_scan_ctx Pointer to the Scanning Module instance.
 *
 * @retval NRF_SUCCESS              If the scanning started. Otherwise, an error code is returned, also if you tried to add a filter that was already added before.
 * @retval NRF_ERROR_NO_MEMORY      If the number of available filters is exceeded.
 */
static ret_code_t nrf_ble_scan_uuid_filter_add(nrf_ble_scan_t * const p_scan_ctx,
                                               ble_uuid_t     const * p_uuid)
{
    ble_uuid_t * p_uuid_filter = p_scan_ctx->scan_filters.uuid_filter.uuid;
    uint8_t    * p_counter     = &p_scan_ctx->scan_filters.uuid_filter.uuid_cnt;
    uint8_t      index;

    // If no memory.
    if (*p_counter >= NRF_BLE_SCAN_UUID_CNT)
    {
        return NRF_ERROR_NO_MEM;
    }

    // Check for duplicated filter.
    for (index = 0; index < NRF_BLE_SCAN_UUID_CNT; index++)
    {
        if (p_uuid_filter[index].uuid == p_uuid->uuid)
        {
            return NRF_SUCCESS;
        }
    }

    // Add UUID to the filter.
    p_uuid_filter[(*p_counter)++] = *p_uuid;
    NRF_LOG_DEBUG("Added filter on UUID %x", p_uuid->uuid);

    return NRF_SUCCESS;
}


#endif // NRF_BLE_SCAN_UUID_CNT


#if (NRF_BLE_SCAN_APPEARANCE_CNT)
/**@brief Function for comparing the provided appearance with the appearance in the advertisement packets.
 *
 * @param[in]     p_adv_report Advertising data to parse.
 * @param[in,out] p_scan_ctx   Pointer to the Scanning Module instance.
 *
 * @return      True if the appearances match. False otherwise.
 */
static bool adv_appearance_compare(ble_gap_evt_adv_report_t const * const p_adv_report,
                                   nrf_ble_scan_t           const * const p_scan_ctx)
{
    nrf_ble_scan_appearance_filter_t const * p_appearance_filter =
        &p_scan_ctx->scan_filters.appearance_filter;
    uint8_t const counter =
        p_scan_ctx->scan_filters.appearance_filter.appearance_cnt;
    uint8_t  index;
    uint16_t data_len;

    data_len = p_adv_report->data.len;

    // Verify if the advertised appearance matches the provided appearance.
    for (index = 0; index < counter; index++)
    {
        if (ble_advdata_appearance_find(p_adv_report->data.p_data,
                                        data_len,
                                        &p_appearance_filter->appearance[index]))
        {
            return true;
        }
    }
    return false;
}


/**@brief Function for adding appearance to the scanning filter.
 *
 * @param[in]     appearance       Appearance to be added.
 * @param[in,out] p_scan_ctx       Pointer to the Scanning Module instance.
 *
 * @retval NRF_SUCCESS             If the filter is added successfully or if you try to add a filter that was already added before.
 * @retval NRF_ERROR_NULL          If a NULL pointer is passed as input.
 * @retval NRF_ERROR_NO_MEMORY     If the number of available filters is exceeded.
 */
static ret_code_t nrf_ble_scan_appearance_filter_add(nrf_ble_scan_t * const p_scan_ctx,
                                                     uint16_t               appearance)
{
    uint16_t * p_appearance_filter = p_scan_ctx->scan_filters.appearance_filter.appearance;
    uint8_t  * p_counter           = &p_scan_ctx->scan_filters.appearance_filter.appearance_cnt;
    uint8_t    index;

    // If no memory.
    if (*p_counter >= NRF_BLE_SCAN_APPEARANCE_CNT)
    {
        return NRF_ERROR_NO_MEM;
    }

    // Check for duplicated filter.
    for ( index = 0; index < NRF_BLE_SCAN_APPEARANCE_CNT; index++)
    {
        if (p_appearance_filter[index] == appearance)
        {
            return NRF_SUCCESS;
        }
    }

    // Add appearance to the filter.
    p_appearance_filter[(*p_counter)++] = appearance;
    NRF_LOG_DEBUG("Added filter on appearance %x", appearance);
    return NRF_SUCCESS;
}


#endif // NRF_BLE_SCAN_APPEARANCE_CNT


ret_code_t nrf_ble_scan_filter_set(nrf_ble_scan_t     * const p_scan_ctx,
                                   nrf_ble_scan_filter_type_t type,
                                   void const               * p_data)
{
    VERIFY_PARAM_NOT_NULL(p_scan_ctx);
    VERIFY_PARAM_NOT_NULL(p_data);

    switch (type)
    {
#if (NRF_BLE_SCAN_NAME_CNT > 0)
        case SCAN_NAME_FILTER:
        {
            char * p_name = (char *)p_data;
            return nrf_ble_scan_name_filter_add(p_scan_ctx, p_name);
        }
#endif

#if (NRF_BLE_SCAN_SHORT_NAME_CNT > 0)
        case SCAN_SHORT_NAME_FILTER:
        {
            nrf_ble_scan_short_name_t * p_short_name = (nrf_ble_scan_short_name_t *)p_data;
            return nrf_ble_scan_short_name_filter_add(p_scan_ctx, p_short_name);
        }
#endif

#if (NRF_BLE_SCAN_ADDRESS_CNT > 0)
        case SCAN_ADDR_FILTER:
        {
            uint8_t * p_addr = (uint8_t *)p_data;
            return nrf_ble_scan_addr_filter_add(p_scan_ctx, p_addr);
        }
#endif

#if (NRF_BLE_SCAN_UUID_CNT > 0)
        case SCAN_UUID_FILTER:
        {
            ble_uuid_t * p_uuid = (ble_uuid_t *)p_data;
            return nrf_ble_scan_uuid_filter_add(p_scan_ctx, p_uuid);
        }
#endif

#if (NRF_BLE_SCAN_APPEARANCE_CNT > 0)
        case SCAN_APPEARANCE_FILTER:
        {
            uint16_t appearance = *((uint16_t *)p_data);
            return nrf_ble_scan_appearance_filter_add(p_scan_ctx, appearance);
        }
#endif

        default:
            return NRF_ERROR_INVALID_PARAM;
    }
}


ret_code_t nrf_ble_scan_all_filter_remove(nrf_ble_scan_t * const p_scan_ctx)
{
#if (NRF_BLE_SCAN_NAME_CNT > 0)
    nrf_ble_scan_name_filter_t * p_name_filter = &p_scan_ctx->scan_filters.name_filter;
    memset(p_name_filter->target_name, 0, sizeof(p_name_filter->target_name));
    p_name_filter->name_cnt = 0;
#endif

#if (NRF_BLE_SCAN_SHORT_NAME_CNT > 0)
    nrf_ble_scan_short_name_filter_t * p_short_name_filter =
        &p_scan_ctx->scan_filters.short_name_filter;
    memset(p_short_name_filter->short_name, 0, sizeof(p_short_name_filter->short_name));
    p_short_name_filter->name_cnt = 0;
#endif

#if (NRF_BLE_SCAN_ADDRESS_CNT > 0)
    nrf_ble_scan_addr_filter_t * p_addr_filter = &p_scan_ctx->scan_filters.addr_filter;
    memset(p_addr_filter->target_addr, 0, sizeof(p_addr_filter->target_addr));
    p_addr_filter->addr_cnt = 0;
#endif

#if (NRF_BLE_SCAN_UUID_CNT > 0)
    nrf_ble_scan_uuid_filter_t * p_uuid_filter = &p_scan_ctx->scan_filters.uuid_filter;
    memset(p_uuid_filter->uuid, 0, sizeof(p_uuid_filter->uuid));
    p_uuid_filter->uuid_cnt = 0;
#endif

#if (NRF_BLE_SCAN_APPEARANCE_CNT > 0)
    nrf_ble_scan_appearance_filter_t * p_appearance_filter =
        &p_scan_ctx->scan_filters.appearance_filter;
    memset(p_appearance_filter->appearance, 0, sizeof(p_appearance_filter->appearance));
    p_appearance_filter->appearance_cnt = 0;
#endif

    return NRF_SUCCESS;
}


ret_code_t nrf_ble_scan_filters_enable(nrf_ble_scan_t * const p_scan_ctx,
                                       uint8_t                mode,
                                       bool                   match_all)
{
    VERIFY_PARAM_NOT_NULL(p_scan_ctx);

    // Check if the mode is correct.
    if ((!(mode & NRF_BLE_SCAN_ADDR_FILTER)) &&
        (!(mode & NRF_BLE_SCAN_NAME_FILTER)) &&
        (!(mode & NRF_BLE_SCAN_UUID_FILTER)) &&
        (!(mode & NRF_BLE_SCAN_SHORT_NAME_FILTER)) &&
        (!(mode & NRF_BLE_SCAN_APPEARANCE_FILTER)))
    {
        return NRF_ERROR_INVALID_PARAM;
    }

    ret_code_t err_code;

    // Disable filters.
    err_code = nrf_ble_scan_filters_disable(p_scan_ctx);
    ASSERT(err_code == NRF_SUCCESS);

    nrf_ble_scan_filters_t * p_filters = &p_scan_ctx->scan_filters;

    // Turn on the filters of your choice.
#if (NRF_BLE_SCAN_ADDRESS_CNT > 0)
    if (mode & NRF_BLE_SCAN_ADDR_FILTER)
    {
        p_filters->addr_filter.addr_filter_enabled = true;
    }
#endif

#if (NRF_BLE_SCAN_NAME_CNT > 0)
    if (mode & NRF_BLE_SCAN_NAME_FILTER)
    {
        p_filters->name_filter.name_filter_enabled = true;
    }
#endif

#if (NRF_BLE_SCAN_SHORT_NAME_CNT > 0)
    if (mode & NRF_BLE_SCAN_SHORT_NAME_FILTER)
    {
        p_filters->short_name_filter.short_name_filter_enabled = true;
    }
#endif

#if (NRF_BLE_SCAN_UUID_CNT > 0)
    if (mode & NRF_BLE_SCAN_UUID_FILTER)
    {
        p_filters->uuid_filter.uuid_filter_enabled = true;
    }
#endif

#if (NRF_BLE_SCAN_APPEARANCE_CNT > 0)
    if (mode & NRF_BLE_SCAN_APPEARANCE_FILTER)
    {
        p_filters->appearance_filter.appearance_filter_enabled = true;
    }
#endif

    // Select the filter mode.
    p_filters->all_filters_mode = match_all;

    return NRF_SUCCESS;
}


ret_code_t nrf_ble_scan_filters_disable(nrf_ble_scan_t * const p_scan_ctx)
{
    VERIFY_PARAM_NOT_NULL(p_scan_ctx);

    // Disable all filters.
#if (NRF_BLE_SCAN_NAME_CNT > 0)
    bool * p_name_filter_enabled = &p_scan_ctx->scan_filters.name_filter.name_filter_enabled;
    *p_name_filter_enabled = false;
#endif

#if (NRF_BLE_SCAN_ADDRESS_CNT > 0)
    bool * p_addr_filter_enabled = &p_scan_ctx->scan_filters.addr_filter.addr_filter_enabled;
    *p_addr_filter_enabled = false;
#endif

#if (NRF_BLE_SCAN_UUID_CNT > 0)
    bool * p_uuid_filter_enabled = &p_scan_ctx->scan_filters.uuid_filter.uuid_filter_enabled;
    *p_uuid_filter_enabled = false;
#endif

#if (NRF_BLE_SCAN_APPEARANCE_CNT > 0)
    bool * p_appearance_filter_enabled =
        &p_scan_ctx->scan_filters.appearance_filter.appearance_filter_enabled;
    *p_appearance_filter_enabled = false;
#endif

    return NRF_SUCCESS;
}


ret_code_t nrf_ble_scan_filter_get(nrf_ble_scan_t * const   p_scan_ctx,
                                   nrf_ble_scan_filters_t * p_status)
{
    VERIFY_PARAM_NOT_NULL(p_scan_ctx);
    VERIFY_PARAM_NOT_NULL(p_status);

    *p_status = p_scan_ctx->scan_filters;

    return NRF_SUCCESS;
}


#endif // NRF_BLE_SCAN_FILTER_ENABLE

/**@brief Function for calling the BLE_GAP_EVT_ADV_REPORT event to check whether the received
 *        scanning data matches the scan configuration.
 *
 * @param[in] p_scan_ctx    Pointer to the Scanning Module instance.
 * @param[in] p_adv_report  Advertising report.
 */
static void nrf_ble_scan_on_adv_report(nrf_ble_scan_t           const * const p_scan_ctx,
                                       ble_gap_evt_adv_report_t const * const p_adv_report)
{
    scan_evt_t scan_evt;

#if (NRF_BLE_SCAN_FILTER_ENABLE == 1)
    uint8_t filter_cnt       = 0;
    uint8_t filter_match_cnt = 0;
#endif

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

    scan_evt.p_scan_params = &p_scan_ctx->scan_params;

    // If the whitelist is used, do not check the filters and return.
    if (is_whitelist_used(p_scan_ctx))
    {
        scan_evt.scan_evt_id        = NRF_BLE_SCAN_EVT_WHITELIST_ADV_REPORT;
        scan_evt.params.p_not_found = p_adv_report;
        p_scan_ctx->evt_handler(&scan_evt);

        UNUSED_RETURN_VALUE(sd_ble_gap_scan_start(NULL, &p_scan_ctx->scan_buffer));
        nrf_ble_scan_connect_with_target(p_scan_ctx, p_adv_report);

        return;
    }

#if (NRF_BLE_SCAN_FILTER_ENABLE == 1)
    bool const all_filter_mode   = p_scan_ctx->scan_filters.all_filters_mode;
    bool       is_filter_matched = false;

#if (NRF_BLE_SCAN_ADDRESS_CNT > 0)
    bool const addr_filter_enabled = p_scan_ctx->scan_filters.addr_filter.addr_filter_enabled;
#endif

#if (NRF_BLE_SCAN_NAME_CNT > 0)
    bool const name_filter_enabled = p_scan_ctx->scan_filters.name_filter.name_filter_enabled;
#endif

#if (NRF_BLE_SCAN_SHORT_NAME_CNT > 0)
    bool const short_name_filter_enabled =
        p_scan_ctx->scan_filters.short_name_filter.short_name_filter_enabled;
#endif

#if (NRF_BLE_SCAN_UUID_CNT > 0)
    bool const uuid_filter_enabled = p_scan_ctx->scan_filters.uuid_filter.uuid_filter_enabled;
#endif

#if (NRF_BLE_SCAN_APPEARANCE_CNT > 0)
    bool const appearance_filter_enabled =
        p_scan_ctx->scan_filters.appearance_filter.appearance_filter_enabled;
#endif


#if (NRF_BLE_SCAN_ADDRESS_CNT > 0)
    // Check the address filter.
    if (addr_filter_enabled)
    {
        // Number of active filters.
        filter_cnt++;
        if (adv_addr_compare(p_adv_report, p_scan_ctx))
        {
            // Number of filters matched.
            filter_match_cnt++;
            // Information about the filters matched.
            scan_evt.params.filter_match.filter_match.address_filter_match = true;
            is_filter_matched = true;
        }
    }
#endif

#if (NRF_BLE_SCAN_NAME_CNT > 0)
    // Check the name filter.
    if (name_filter_enabled)
    {
        filter_cnt++;
        if (adv_name_compare(p_adv_report, p_scan_ctx))
        {
            filter_match_cnt++;

            // Information about the filters matched.
            scan_evt.params.filter_match.filter_match.name_filter_match = true;
            is_filter_matched = true;
        }
    }
#endif

#if (NRF_BLE_SCAN_SHORT_NAME_CNT > 0)
    if (short_name_filter_enabled)
    {
        filter_cnt++;
        if (adv_short_name_compare(p_adv_report, p_scan_ctx))
        {
            filter_match_cnt++;

            // Information about the filters matched.
            scan_evt.params.filter_match.filter_match.short_name_filter_match = true;
            is_filter_matched = true;
        }
    }
#endif

#if (NRF_BLE_SCAN_UUID_CNT > 0)
    // Check the UUID filter.
    if (uuid_filter_enabled)
    {
        filter_cnt++;
        if (adv_uuid_compare(p_adv_report, p_scan_ctx))
        {
            filter_match_cnt++;
            // Information about the filters matched.
            scan_evt.params.filter_match.filter_match.uuid_filter_match = true;
            is_filter_matched = true;
        }
    }
#endif

#if (NRF_BLE_SCAN_APPEARANCE_CNT > 0)
    // Check the appearance filter.
    if (appearance_filter_enabled)
    {
        filter_cnt++;
        if (adv_appearance_compare(p_adv_report, p_scan_ctx))
        {
            filter_match_cnt++;
            // Information about the filters matched.
            scan_evt.params.filter_match.filter_match.appearance_filter_match = true;
            is_filter_matched = true;
        }
    }

    scan_evt.scan_evt_id = NRF_BLE_SCAN_EVT_NOT_FOUND;
#endif

    scan_evt.params.filter_match.p_adv_report = p_adv_report;

    // In the multifilter mode, the number of the active filters must equal the number of the filters matched to generate the notification.
    if (all_filter_mode && (filter_match_cnt == filter_cnt))
    {
        scan_evt.scan_evt_id = NRF_BLE_SCAN_EVT_FILTER_MATCH;
        nrf_ble_scan_connect_with_target(p_scan_ctx, p_adv_report);
    }
    // In the normal filter mode, only one filter match is needed to generate the notification to the main application.
    else if ((!all_filter_mode) && is_filter_matched)
    {
        scan_evt.scan_evt_id = NRF_BLE_SCAN_EVT_FILTER_MATCH;
        nrf_ble_scan_connect_with_target(p_scan_ctx, p_adv_report);
    }
    else
    {
        scan_evt.scan_evt_id        = NRF_BLE_SCAN_EVT_NOT_FOUND;
        scan_evt.params.p_not_found = p_adv_report;

    }

    // If the event handler is not NULL, notify the main application.
    if (p_scan_ctx->evt_handler != NULL)
    {
        p_scan_ctx->evt_handler(&scan_evt);
    }

#endif // NRF_BLE_SCAN_FILTER_ENABLE

    // Resume the scanning.
    UNUSED_RETURN_VALUE(sd_ble_gap_scan_start(NULL, &p_scan_ctx->scan_buffer));
}


/**@brief Function for checking whether the whitelist is used.
 *
 * @param[in] p_scan_ctx   Scanning Module instance.
 */
bool is_whitelist_used(nrf_ble_scan_t const * const p_scan_ctx)
{
    if (p_scan_ctx->scan_params.filter_policy == BLE_GAP_SCAN_FP_WHITELIST ||
        p_scan_ctx->scan_params.filter_policy == BLE_GAP_SCAN_FP_WHITELIST_NOT_RESOLVED_DIRECTED)
    {
        return true;
    }

    return false;
}


/**@brief Function for restoring the default scanning parameters.
 *
 * @param[out] p_scan_ctx    Pointer to the Scanning Module instance.
 */
static void nrf_ble_scan_default_param_set(nrf_ble_scan_t * const p_scan_ctx)
{
    // Set the default parameters.
    p_scan_ctx->scan_params.active        = 1;
    p_scan_ctx->scan_params.interval      = NRF_BLE_SCAN_SCAN_INTERVAL;
    p_scan_ctx->scan_params.window        = NRF_BLE_SCAN_SCAN_WINDOW;
    p_scan_ctx->scan_params.timeout       = NRF_BLE_SCAN_SCAN_DURATION;
    p_scan_ctx->scan_params.filter_policy = BLE_GAP_SCAN_FP_ACCEPT_ALL;
    p_scan_ctx->scan_params.scan_phys     = BLE_GAP_PHY_1MBPS;
}


/**@brief Function for setting the default connection parameters.
 *
 * @param[out] p_scan_ctx    Pointer to the Scanning Module instance.
 */
static void nrf_ble_scan_default_conn_param_set(nrf_ble_scan_t * const p_scan_ctx)
{
    p_scan_ctx->conn_params.conn_sup_timeout =
        (uint16_t)MSEC_TO_UNITS(NRF_BLE_SCAN_SUPERVISION_TIMEOUT, UNIT_10_MS);
    p_scan_ctx->conn_params.min_conn_interval =
        (uint16_t)MSEC_TO_UNITS(NRF_BLE_SCAN_MIN_CONNECTION_INTERVAL, UNIT_1_25_MS);
    p_scan_ctx->conn_params.max_conn_interval =
        (uint16_t)MSEC_TO_UNITS(NRF_BLE_SCAN_MAX_CONNECTION_INTERVAL, UNIT_1_25_MS);
    p_scan_ctx->conn_params.slave_latency =
        (uint16_t)NRF_BLE_SCAN_SLAVE_LATENCY;
}


/**@brief Function for calling the BLE_GAP_EVT_TIMEOUT event.
 *
 * @param[in] p_scan_ctx  Pointer to the Scanning Module instance.
 * @param[in] p_gap       GAP event structure.
 */
static void nrf_ble_scan_on_timeout(nrf_ble_scan_t const * const p_scan_ctx,
                                    ble_gap_evt_t  const * const p_gap)
{
    ble_gap_evt_timeout_t const * p_timeout = &p_gap->params.timeout;
    scan_evt_t                    scan_evt;

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

    if (p_timeout->src == BLE_GAP_TIMEOUT_SRC_SCAN)
    {
        NRF_LOG_DEBUG("BLE_GAP_SCAN_TIMEOUT");
        if (p_scan_ctx->evt_handler != NULL)
        {
            scan_evt.scan_evt_id        = NRF_BLE_SCAN_EVT_SCAN_TIMEOUT;
            scan_evt.p_scan_params      = &p_scan_ctx->scan_params;
            scan_evt.params.timeout.src = p_timeout->src;

            p_scan_ctx->evt_handler(&scan_evt);
        }
    }
}


/**@brief Function for calling the BLE_GAP_EVT_SCAN_REQ_REPORT event.
 *
 * @param[in] p_scan_ctx  Pointer to the Scanning Module instance.
 * @param[in] p_gap       GAP event structure.
 */
static void nrf_ble_scan_on_req_report(nrf_ble_scan_t const * const p_scan_ctx,
                                       ble_gap_evt_t  const * const p_gap)
{
    ble_gap_evt_scan_req_report_t const * p_req_report = &p_gap->params.scan_req_report;
    scan_evt_t                            scan_evt;

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

    if (p_scan_ctx->evt_handler != NULL)
    {
        scan_evt.scan_evt_id       = NRF_BLE_SCAN_EVT_SCAN_REQ_REPORT;
        scan_evt.p_scan_params     = &p_scan_ctx->scan_params;
        scan_evt.params.req_report = *p_req_report;

        p_scan_ctx->evt_handler(&scan_evt);
    }
}


/**@brief Function for stopping the scanning.
 */
void nrf_ble_scan_stop(void)
{
    // It is ok to ignore the function return value here, because this function can return NRF_SUCCESS or
    // NRF_ERROR_INVALID_STATE, when app is not in the scanning state.
    UNUSED_RETURN_VALUE(sd_ble_gap_scan_stop());
}


ret_code_t nrf_ble_scan_init(nrf_ble_scan_t            * const p_scan_ctx,
                             nrf_ble_scan_init_t const * const p_init,
                             nrf_ble_scan_evt_handler_t        evt_handler)
{
    VERIFY_PARAM_NOT_NULL(p_scan_ctx);

    p_scan_ctx->evt_handler = evt_handler;

#if (NRF_BLE_SCAN_FILTER_ENABLE == 1)
    // Disable all scanning filters.
    memset(&p_scan_ctx->scan_filters, 0, sizeof(p_scan_ctx->scan_filters));
#endif

    // If the pointer to the initialization structure exist, use it to scan the configuration.
    if (p_init != NULL)
    {
        p_scan_ctx->connect_if_match = p_init->connect_if_match;
        p_scan_ctx->conn_cfg_tag     = p_init->conn_cfg_tag;

        if (p_init->p_scan_param != NULL)
        {
            p_scan_ctx->scan_params = *p_init->p_scan_param;
        }
        else
        {
            // Use the default static configuration.
            nrf_ble_scan_default_param_set(p_scan_ctx);
        }

        if (p_init->p_conn_param != NULL)
        {
            p_scan_ctx->conn_params = *p_init->p_conn_param;
        }
        else
        {
            // Use the default static configuration.
            nrf_ble_scan_default_conn_param_set(p_scan_ctx);
        }
    }
    // If pointer is NULL, use the static default configuration.
    else
    {
        nrf_ble_scan_default_param_set(p_scan_ctx);
        nrf_ble_scan_default_conn_param_set(p_scan_ctx);

        p_scan_ctx->connect_if_match = false;
    }

    // Assign a buffer where the advertising reports are to be stored by the SoftDevice.
    p_scan_ctx->scan_buffer.p_data = p_scan_ctx->scan_buffer_data;
    p_scan_ctx->scan_buffer.len    = NRF_BLE_SCAN_BUFFER;

    return NRF_SUCCESS;
}


ret_code_t nrf_ble_scan_start(nrf_ble_scan_t const * const p_scan_ctx)
{
    VERIFY_PARAM_NOT_NULL(p_scan_ctx);

    ret_code_t err_code;
    scan_evt_t scan_evt;

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

    nrf_ble_scan_stop();

    // If the whitelist is used and the event handler is not NULL, send the whitelist request to the main application.
    if (is_whitelist_used(p_scan_ctx))
    {
        if (p_scan_ctx->evt_handler != NULL)
        {
            scan_evt.scan_evt_id = NRF_BLE_SCAN_EVT_WHITELIST_REQUEST;
            p_scan_ctx->evt_handler(&scan_evt);
        }
    }

    // Start the scanning.
    err_code = sd_ble_gap_scan_start(&p_scan_ctx->scan_params, &p_scan_ctx->scan_buffer);

    // It is okay to ignore this error, because the scan stopped earlier.
    if ((err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_SUCCESS))
    {
        NRF_LOG_ERROR("sd_ble_gap_scan_start returned 0x%x", err_code);
        return (err_code);
    }
    NRF_LOG_DEBUG("Scanning");

    return NRF_SUCCESS;
}


ret_code_t nrf_ble_scan_params_set(nrf_ble_scan_t              * const p_scan_ctx,
                                   ble_gap_scan_params_t const * const p_scan_param)
{
    VERIFY_PARAM_NOT_NULL(p_scan_ctx);

    nrf_ble_scan_stop();

    if (p_scan_param != NULL)
    {
        // Assign new scanning parameters.
        p_scan_ctx->scan_params = *p_scan_param;
    }
    else
    {
        // If NULL, use the default static configuration.
        nrf_ble_scan_default_param_set(p_scan_ctx);
    }

    NRF_LOG_DEBUG("Scanning parameters have been changed successfully");

    return NRF_SUCCESS;
}


/**@brief Function for calling the BLE_GAP_EVT_CONNECTED event.
 *
 * @param[in] p_scan_ctx  Pointer to the Scanning Module instance.
 * @param[in] p_gap_evt   GAP event structure.
 */
static void nrf_ble_scan_on_connected_evt(nrf_ble_scan_t const * const p_scan_ctx,
                                          ble_gap_evt_t  const * const p_gap_evt)
{
    scan_evt_t scan_evt;

    memset(&scan_evt, 0, sizeof(scan_evt));
    scan_evt.scan_evt_id                  = NRF_BLE_SCAN_EVT_CONNECTED;
    scan_evt.params.connected.p_connected = &p_gap_evt->params.connected;
    scan_evt.params.connected.conn_handle = p_gap_evt->conn_handle;
    scan_evt.p_scan_params                = &p_scan_ctx->scan_params;

    if (p_scan_ctx->evt_handler != NULL)
    {
        p_scan_ctx->evt_handler(&scan_evt);
    }
}


ret_code_t nrf_ble_scan_copy_addr_to_sd_gap_addr(ble_gap_addr_t * p_gap_addr,
                                                 const uint8_t    addr[BLE_GAP_ADDR_LEN])
{
    uint16_t addr_type;

    addr_type = nrf_ble_scan_address_type_decode(addr);

    if (addr_type == BLE_ERROR_GAP_INVALID_BLE_ADDR)
    {
        return BLE_ERROR_GAP_INVALID_BLE_ADDR;
    }

    p_gap_addr->addr_type = addr_type;

    for (uint8_t i = 0; i < BLE_GAP_ADDR_LEN; ++i)
    {
        p_gap_addr->addr[i] = addr[BLE_GAP_ADDR_LEN - (i + 1)];
    }

    return NRF_SUCCESS;
}


void nrf_ble_scan_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_contex)
{
    nrf_ble_scan_t                 * p_scan_data  = (nrf_ble_scan_t *)p_contex;
    ble_gap_evt_adv_report_t const * p_adv_report = &p_ble_evt->evt.gap_evt.params.adv_report;
    ble_gap_evt_t const            * p_gap_evt    = &p_ble_evt->evt.gap_evt;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_ADV_REPORT:
            nrf_ble_scan_on_adv_report(p_scan_data, p_adv_report);
            break;

        case BLE_GAP_EVT_TIMEOUT:
            nrf_ble_scan_on_timeout(p_scan_data, p_gap_evt);
            break;

        case BLE_GAP_EVT_SCAN_REQ_REPORT:
            nrf_ble_scan_on_req_report(p_scan_data, p_gap_evt);

            break;

        case BLE_GAP_EVT_CONNECTED:
            nrf_ble_scan_on_connected_evt(p_scan_data, p_gap_evt);
            break;

        default:
            break;
    }
}


#endif // NRF_BLE_SCAN_ENABLED

[Edvin]

davidm said:

it does get inside name_filter_enabled but  adv_short_name_compare(p_adv_report, p_scan_ctx)

 Ah! There we go.

The advertisement doesn't contain a short name. It contains a complete name. (see the difference between 0x08 and 0x09)

adv_short_name_compare (if you go to the definition, a couple of steps inside this function) you will see that it looks for BLE_GAP_AD_TYPE_SHORT_LOCAL_NAME, which is 0x08, while your advertisement contains BLE_GAP_AD_TYPE_COMPLETE_LOCAL_NAME which is 0x09. Try to set:

NRF_BLE_SCAN_NAME_CNT to 1, and NRF_BLE_SCAN_SHORT_NAME_CNT to 0, so that you use the correct function, adv_name_compare() instead of adv_short_name_compare().

[davidm]

Hi Edvin

My mistake, I meant to say ...it does get inside name_filter_enabled but  adv_name_compare(p_adv_report, p_scan_ctx)is always false.

It was a copy/paste  error.