Beacon Scanner Problem

RE: Beacon Scanner Problem

Reza papi — Fri, 12 Nov 2021 22:33:13 GMT

Thank you Susheel Nuguru for your time. I really appreciate it. I just copy the above code to the BLE template code in SDK17 but unfortunately, I did not receive any data.

Best,

RE: Beacon Scanner Problem

Susheel Nuguru — Fri, 12 Nov 2021 08:45:41 GMT

sorry for coming back so late, i tried these attached code in SDK17 without any modifications and it works as it is. I see no issues with scanner not able to find the beacon packets.

RE: Beacon Scanner Problem

Reza papi — Fri, 05 Nov 2021 17:43:39 GMT

#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "nrf_sdh.h"
#include "nrf_sdh_ble.h"
#include "nrf_sdh_soc.h"
#include "nrf_pwr_mgmt.h"
#include "ble.h"
#include "nrf_delay.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

#define SCAN_INTERVAL                   0x00A0                              /**< Determines scan interval in units of 0.625 millisecond. */
#define SCAN_WINDOW                     0x0050                              /**< Determines scan window in units of 0.625 millisecond. */
#define SCAN_DURATION                   0x0000                              /**< Timout when scanning. 0x0000 disables timeout. */
#define APP_BLE_CONN_CFG_TAG            1                                   /**< A tag identifying the SoftDevice BLE configuration. */
#define APP_BLE_OBSERVER_PRIO           3                                   /**< Application's BLE observer priority. You shouldn't need to modify this value. */

static ble_gap_scan_params_t const m_scan_params =
{
    .extended = 0,
    .report_incomplete_evts = 0,
    .active   = 1,
    .filter_policy = BLE_GAP_SCAN_FP_ACCEPT_ALL,
    .scan_phys = BLE_GAP_PHY_1MBPS,
    .interval = SCAN_INTERVAL,
    .window   = SCAN_WINDOW,
    .timeout  = SCAN_DURATION
};

static uint8_t m_scan_buffer_data[BLE_GAP_SCAN_BUFFER_MIN]; /**< buffer where advertising reports will be stored by the SoftDevice. */

static ble_data_t m_scan_buffer =
{
    m_scan_buffer_data,
    BLE_GAP_SCAN_BUFFER_MIN
};

static void scan_start(void)
{
    (void) sd_ble_gap_scan_stop();
    sd_ble_gap_scan_start(&m_scan_params, &m_scan_buffer);
}

uint8_t * adv_address = 0; int8_t rssi = 0; uint8_t * adv_data = 0;

static void on_adv_report(ble_gap_evt_adv_report_t const * p_adv_report)
{
    adv_address = (uint8_t *)p_adv_report->peer_addr.addr;
    rssi = (int8_t)p_adv_report->rssi;
    adv_data = (uint8_t *)p_adv_report->data.p_data;
    
    //if(adv_address[0] == 0x73 && adv_address[1] == 0xE8)
    //{
    printf("MAC ID");
    for(int i=0;i<6;i++)
    {
    printf(":%02X",adv_address[i]);
    }
    printf("\tDATA: ");
    for(int j=0;j<16;j++)
    {
    printf("%02X",adv_data[j]);
    }
    printf("\tRSSI: %d DB\n", rssi);
    nrf_delay_ms(1000);
    //}
}

static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
    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:
        {
            on_adv_report(&p_gap_evt->params.adv_report);
            scan_start(); // <-- NEW ADDITION

        } break;

        default:
          break;
    }
}

static void ble_stack_init(void)
{ 
  uint32_t ram_start = 0;
  nrf_sdh_enable_request();
  nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
  nrf_sdh_ble_enable(&ram_start);
  NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
}

int main(void)
{
    NRF_LOG_INIT(NULL);
    NRF_LOG_DEFAULT_BACKENDS_INIT();
    nrf_pwr_mgmt_init();
    ble_stack_init();
    
    while(1)
    {
      scan_start();
      NRF_LOG_FLUSH();
      nrf_pwr_mgmt_run();
    }
}

Thank you for information.

I changed the code as you said but again I did not get any result on the log screen.

RE: Beacon Scanner Problem

Susheel Nuguru — Fri, 05 Nov 2021 07:34:06 GMT

I do not remember the details of this old post, but based on the logs it seems like it worked for me out of the box with the given code snippet.

On the later version of the softdevice the scanner stops automatically on the following events which is a change from older version

/**@brief Start or continue scanning (GAP Discovery procedure, Observer Procedure).
 *
 * @note    A call to this function will require the application to keep the memory pointed by
 *          p_adv_report_buffer alive until the buffer is released. The buffer is released when the scanner is stopped
 *          or when this function is called with another buffer.
 *
 * @note    The scanner will automatically stop in the following cases:
 *           - @ref sd_ble_gap_scan_stop is called.
 *           - @ref sd_ble_gap_connect is called.
 *           - A @ref BLE_GAP_EVT_TIMEOUT with source set to @ref BLE_GAP_TIMEOUT_SRC_SCAN is received.
 *           - When a @ref BLE_GAP_EVT_ADV_REPORT event is received.
 *             In this case scanning is only paused to let the application access received data.
 *             The application must call this function to continue scanning, or call
 *             @ref sd_ble_gap_scan_stop to stop scanning.

So when you get BLE_GAP_EVT_ADV_REPORT in the ble_evt_handler you should start the scanner again like below.

    switch (p_ble_evt->header.evt_id)
    {

        case BLE_GAP_EVT_ADV_REPORT:
        {
            on_adv_report(&p_gap_evt->params.adv_report);
            scan_start(); // <-- NEW ADDITION

        } break;

Try to see if it works.

RE: Beacon Scanner Problem

Reza papi — Thu, 04 Nov 2021 17:54:32 GMT

Hi Susheel Nuguru

I run the above code to scan the beacons but it doesn't receive any data packet. I see you checked the code and it seems it works for you. do you know what is the reason that I didn't receive any packets?

Thank you.

RE: Beacon Scanner Problem

Susheel Nuguru — Wed, 26 Dec 2018 18:08:56 GMT

Sorry there, there seems to be a glitch in my thread queue as this thread seems to be unanswered for many days (not intentional). do you still have this problem?

Most of us on holidays until New year. We will get back to you once we are back to office after 2nd January. We appreciate your patience.

RE: Beacon Scanner Problem

Roh_Sys — Tue, 11 Dec 2018 18:08:03 GMT

Hey Susheel Nuguru,

Read my post carefully.

RE: Beacon Scanner Problem

Susheel Nuguru — Tue, 11 Dec 2018 13:43:18 GMT

I quickly ran your code and could see that the scanner is getting the adv packets as they should.Check the RTT log data below

MAC ID:CD:81:5B:10:66:D9 DATA: 0201041AFF5900020000000000000000 RSSI: -23 DB
MAC ID:06:B8:4E:BB:27:05 DATA: 1EFF060001092000C6E93350B9720A33 RSSI: -79 DB
MAC ID:D3:6C:E0:FE:34:C4 DATA: 0201041AFF5900021501122334455667 RSSI: -79 DB
MAC ID:C0:DE:5E:43:DB:66 DATA: 02011A0AFF4C001005031CE8AE705667 RSSI: -90 DB
MAC ID:06:B8:4E:BB:27:05 DATA: 1EFF060001092000C6E93350B9720A33 RSSI: -80 DB
MAC ID:DC:73:76:6D:E3:D1 DATA: 0319C103020106030312180609313233 RSSI: -84 DB
MAC ID:EF:20:CF:E4:50:21 DATA: 1EFF06000109200072777984CDA5A26E RSSI: -69 DB
MAC ID:E3:5B:83:A1:41:2C DATA: 0201190503BEFE26FE0DFF01095110F1 RSSI: -74 DB
MAC ID:DC:73:76:6D:E3:D1 DATA: 0319C103020106030312180609313233 RSSI: -84 DB
MAC ID:9A:07:A8:F4:CB:36 DATA: 1EFF06000109200032C558CB1E59B564 RSSI: -74 DB
MAC ID:DC:73:76:6D:E3:D1 DATA: 0319C103020106030312180609313233 RSSI: -82 DB
MAC ID:CD:81:5B:10:66:D9 DATA: 0201041AFF5900020000000000000000 RSSI: -21 DB
MAC ID:9A:07:A8:F4:CB:36 DATA: 1EFF06000109200032C558CB1E59B564 RSSI: -78 DB
MAC ID:CD:81:5B:10:66:D9 DATA: 0201041AFF5900020000000000000000 RSSI: -23 DB
MAC ID:DE:84:3E:89:4E:10 DATA: 0201061107669A0C2000089A94E3117B RSSI: -88 DB