Use BLE_GAP_EVT_ADV_REPORT to scan for beacon

[Max]

Setup:

Module: nRF51822.

SDK version:nRF5_SDK_11.0.0_89a8197.

Example: ble_app_uart.

Softdevice: S130.

I use ble_nus_string_send on the BLE_GAP_EVT_ADV_REPORT in on_ble_evt tring to scan for

beacon and found that it only outputs strings less than 20 bytes. Dig a little further, I found it's

because of

if (length > BLE_NUS_MAX_DATA_LEN)
{
return NRF_ERROR_INVALID_PARAM;
}

in ble_nus.c while BLE_NUS_MAX_DATA_LEN is defined as (GATT_MTU_SIZE_DEFAULT - 3) and

GATT_MTU_SIZE_DEFAULT is defined to be 23.

My question is how to modify so I can scan for beacon whose data length is about 30? Or it's just

not supported in S130 to scan for beacons this way?

[Max]

It's for inspection of received packets only.

Fullscreen 6014.main.c Download

/* Copyright (c) 2014 Nordic Semiconductor. All Rights Reserved.
 *
 * The information contained herein is property of Nordic Semiconductor ASA.
 * Terms and conditions of usage are described in detail in NORDIC
 * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
 *
 * Licensees are granted free, non-transferable use of the information. NO
 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
 * the file.
 *
 */

/** @file
 *
 * @defgroup ble_sdk_uart_over_ble_main main.c
 * @{
 * @ingroup  ble_sdk_app_nus_eval
 * @brief    UART over BLE application main file.
 *
 * This file contains the source code for a sample application that uses the Nordic UART service.
 * This application uses the @ref srvlib_conn_params module.
 */

#include <stdint.h>
#include <string.h>
#include "nordic_common.h"
#include "nrf.h"
#include "ble_hci.h"
#include "ble_advdata.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "softdevice_handler.h"
#include "app_timer.h"
#include "app_button.h"
#include "ble_nus.h"
#include "app_uart.h"
#include "app_util_platform.h"
#include "bsp.h"
#include "bsp_btn_ble.h"

// 20210714
// Max Lu
#include "nrf_delay.h"
#include "scanner_beacon.h"

#define IS_SRVC_CHANGED_CHARACT_PRESENT 0                                           /**< Include the service_changed characteristic. If not enabled, the server's database cannot be changed for the lifetime of the device. */

#define CENTRAL_LINK_COUNT              0                                           /**< Number of central links used by the application. When changing this number remember to adjust the RAM settings*/
#define PERIPHERAL_LINK_COUNT           1                                           /**< Number of peripheral links used by the application. When changing this number remember to adjust the RAM settings*/

#ifdef living_room
#define DEVICE_NAME                     "iot_livingroom"                               /**< Name of device. Will be included in the advertising data. */
#define BEACON_LOC                      0xf4                        //Identify Beacons. 0xf4 is in living room.
#else
#define DEVICE_NAME                     "Not_defined"                               /**< Name of device. Will be included in the advertising data. */
#define BEACON_LOC                      0xff
#endif

#define NUS_SERVICE_UUID_TYPE           BLE_UUID_TYPE_VENDOR_BEGIN                  /**< UUID type for the Nordic UART Service (vendor specific). */

#define APP_ADV_INTERVAL                64                                          /**< The advertising interval (in units of 0.625 ms. This value corresponds to 40 ms). */
//#define APP_ADV_TIMEOUT_IN_SECONDS      180                                         /**< The advertising timeout (in units of seconds). */
#define APP_ADV_TIMEOUT_IN_SECONDS      20                                         /**< The advertising timeout (in units of seconds). */

#define APP_TIMER_PRESCALER             0                                           /**< Value of the RTC1 PRESCALER register. */
#define APP_TIMER_OP_QUEUE_SIZE         4                                           /**< Size of timer operation queues. */

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(20, UNIT_1_25_MS)             /**< Minimum acceptable connection interval (20 ms), Connection interval uses 1.25 ms units. */
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(75, UNIT_1_25_MS)             /**< Maximum acceptable connection interval (75 ms), Connection interval uses 1.25 ms units. */
#define SLAVE_LATENCY                   0                                           /**< Slave latency. */
#define CONN_SUP_TIMEOUT                MSEC_TO_UNITS(4000, UNIT_10_MS)             /**< Connection supervisory timeout (4 seconds), Supervision Timeout uses 10 ms units. */
#define FIRST_CONN_PARAMS_UPDATE_DELAY  APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER)  /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(30000, APP_TIMER_PRESCALER) /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT    3                                           /**< Number of attempts before giving up the connection parameter negotiation. */

#define DEAD_BEEF                       0xDEADBEEF                                  /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */

#define UART_TX_BUF_SIZE                256                                         /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE                256                                         /**< UART RX buffer size. */

static ble_nus_t                        m_nus;                                      /**< Structure to identify the Nordic UART Service. */
static uint16_t                         m_conn_handle = BLE_CONN_HANDLE_INVALID;    /**< Handle of the current connection. */

static ble_uuid_t                       m_adv_uuids[] = {{BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE}};  /**< Universally unique service identifier. */

// 20210714
// Max Lu
#define BLE_IDLE 0
#define BLE_ADVERTISING 1
#define BLE_CONNECTED 2
#define SEARCHED_MAJOR                          0x1234  // Decimal 13330
#define SEARCHED_MINOR                          0x5678  // Decimal 30806
#define APP_COMPANY_IDENTIFIER                  0x004C                                  /**< Company identifier for Nordic Semiconductor ASA. as per www.bluetooth.org. */
#define MAX_IDENTIFIER                  0x0617                                  /**< Company identifier for Nordic Semiconductor ASA. as per www.bluetooth.org. */
#define APP_BEACON_UUID                  0xe2, 0xc5, 0x6d, 0xb5, \
                                         0xdf, 0xfb, 0x48, 0xd2, \
                                         0xb0, 0x60, 0xd0, 0xf5, \
                                         0xa7, 0x10, 0x96, 0xe0            /**< Proprietary UUID for Beacon. */

static ble_gap_adv_params_t m_adv_params;                                  /**< Parameters to be passed to the stack when starting advertising. */
static bool beacon_broadcast = false;
uint8_t ble_state = BLE_IDLE;
uint16_t raw_temp;

void beacon_start(uint16_t manu_id, uint16_t major_value, uint16_t minor_value);
void sensor_start();
static ble_beacon_scanner_init_t m_beacon_scanner_init;


APP_TIMER_DEF(m_xs_timer_id);
APP_TIMER_DEF(m_xm_timer_id);
#define XS_INTERVAL          APP_TIMER_TICKS(3000, APP_TIMER_PRESCALER) 
#define XM_INTERVAL          APP_TIMER_TICKS(3600000, APP_TIMER_PRESCALER) 
#define BROADCAST_TIME      3000

/**@brief Function for assert macro callback.
 *
 * @details This function will be called in case of an assert in the SoftDevice.
 *
 * @warning This handler is an example only and does not fit a final product. You need to analyse 
 *          how your product is supposed to react in case of Assert.
 * @warning On assert from the SoftDevice, the system can only recover on reset.
 *
 * @param[in] line_num    Line number of the failing ASSERT call.
 * @param[in] p_file_name File name of the failing ASSERT call.
 */
void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
{
    app_error_handler(DEAD_BEEF, line_num, p_file_name);
}


/**@brief Function for the GAP initialization.
 *
 * @details This function will set up all the necessary GAP (Generic Access Profile) parameters of 
 *          the device. It also sets the permissions and appearance.
 */
static void gap_params_init(void)
{
    uint32_t                err_code;
    ble_gap_conn_params_t   gap_conn_params;
    ble_gap_conn_sec_mode_t sec_mode;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
    
    err_code = sd_ble_gap_device_name_set(&sec_mode,
                                          (const uint8_t *) DEVICE_NAME,
                                          strlen(DEVICE_NAME));
    APP_ERROR_CHECK(err_code);

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

    gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
    gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
    gap_conn_params.slave_latency     = SLAVE_LATENCY;
    gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;

    err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling the data from the Nordic UART Service.
 *
 * @details This function will process the data received from the Nordic UART BLE Service and send
 *          it to the UART module.
 *
 * @param[in] p_nus    Nordic UART Service structure.
 * @param[in] p_data   Data to be send to UART module.
 * @param[in] length   Length of the data.
 */
/**@snippet [Handling the data received over BLE] */
static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
    for (uint32_t i = 0; i < length; i++)
    {
        while(app_uart_put(p_data[i]) != NRF_SUCCESS);
    }
    while(app_uart_put('\n') != NRF_SUCCESS);
}
/**@snippet [Handling the data received over BLE] */


/**@brief Function for initializing services that will be used by the application.
 */
static void services_init(void)
{
    uint32_t       err_code;
    ble_nus_init_t nus_init;
    
    memset(&nus_init, 0, sizeof(nus_init));

    nus_init.data_handler = nus_data_handler;
    
    err_code = ble_nus_init(&m_nus, &nus_init);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling an event from the Connection Parameters Module.
 *
 * @details This function will be called for all events in the Connection Parameters Module
 *          which are passed to the application.
 *
 * @note All this function does is to disconnect. This could have been done by simply setting
 *       the disconnect_on_fail config parameter, but instead we use the event handler
 *       mechanism to demonstrate its use.
 *
 * @param[in] p_evt  Event received from the Connection Parameters Module.
 */
static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
{
    uint32_t err_code;
    
    if(p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
    {
        err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
        APP_ERROR_CHECK(err_code);
    }
}


/**@brief Function for handling errors from the Connection Parameters module.
 *
 * @param[in] nrf_error  Error code containing information about what went wrong.
 */
static void conn_params_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}


/**@brief Function for initializing the Connection Parameters module.
 */
static void conn_params_init(void)
{
    uint32_t               err_code;
    ble_conn_params_init_t cp_init;
    
    memset(&cp_init, 0, sizeof(cp_init));

    cp_init.p_conn_params                  = NULL;
    cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
    cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAMS_UPDATE_DELAY;
    cp_init.max_conn_params_update_count   = MAX_CONN_PARAMS_UPDATE_COUNT;
    cp_init.start_on_notify_cccd_handle    = BLE_GATT_HANDLE_INVALID;
    cp_init.disconnect_on_fail             = false;
    cp_init.evt_handler                    = on_conn_params_evt;
    cp_init.error_handler                  = conn_params_error_handler;
    
    err_code = ble_conn_params_init(&cp_init);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for putting the chip into sleep mode.
 *
 * @note This function will not return.
 */
static void sleep_mode_enter(void)
{
    uint32_t err_code = bsp_indication_set(BSP_INDICATE_IDLE);
    APP_ERROR_CHECK(err_code);

    // Prepare wakeup buttons.
    err_code = bsp_btn_ble_sleep_mode_prepare();
    APP_ERROR_CHECK(err_code);

    // Go to system-off mode (this function will not return; wakeup will cause a reset).
    err_code = sd_power_system_off();
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling advertising events.
 *
 * @details This function will be called for advertising events which are passed to the application.
 *
 * @param[in] ble_adv_evt  Advertising event.
 */
static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
{
    uint32_t err_code;

    switch (ble_adv_evt)
    {
        case BLE_ADV_EVT_FAST:
            err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
            APP_ERROR_CHECK(err_code);
            break;
        case BLE_ADV_EVT_IDLE:
            // 20210714
            // Max
            //sleep_mode_enter();
            break;
        default:
            break;
    }
}


/**@brief Function for the application's SoftDevice event handler.
 *
 * @param[in] p_ble_evt SoftDevice event.
 */
static void on_ble_evt(ble_evt_t * p_ble_evt)
{
    uint32_t                         err_code;
    //ble_gap_evt_adv_report_t        * p_adv_report = &p_ble_evt->evt.gap_evt.params.adv_report;
    
    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
            APP_ERROR_CHECK(err_code);
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
            ble_state = BLE_CONNECTED;
            break;
            
        case BLE_GAP_EVT_DISCONNECTED:
            err_code = bsp_indication_set(BSP_INDICATE_IDLE);
            APP_ERROR_CHECK(err_code);
            m_conn_handle = BLE_CONN_HANDLE_INVALID;
            ble_state = BLE_IDLE;
            break;

        case BLE_GAP_EVT_TIMEOUT:
            ble_state = BLE_IDLE;
            break;

        case BLE_GAP_EVT_ADV_REPORT:
            {
                //uint16_t length;
                
                //length = p_adv_report->dlen;
                //if ((p_adv_report->dlen == 30 ) && (ble_state == BLE_CONNECTED) &&
                    //(p_adv_report->data[25] == 0x34) &&
                    //(p_adv_report->data[26] == 0x12) &&
                    //(p_adv_report->data[27] == 0x78) &&
                    //(p_adv_report->data[2] == 0x1a))
                    //ble_nus_string_send(&m_nus, p_adv_report->data, p_adv_report->dlen);
            }
            break;

        case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
            // Pairing not supported
            err_code = sd_ble_gap_sec_params_reply(m_conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GATTS_EVT_SYS_ATTR_MISSING:
            // No system attributes have been stored.
            err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0);
            APP_ERROR_CHECK(err_code);
            break;

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


/**@brief Function for dispatching a SoftDevice event to all modules with a SoftDevice 
 *        event handler.
 *
 * @details This function is called from the SoftDevice event interrupt handler after a 
 *          SoftDevice event has been received.
 *
 * @param[in] p_ble_evt  SoftDevice event.
 */
static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
    ble_conn_params_on_ble_evt(p_ble_evt);
    ble_nus_on_ble_evt(&m_nus, p_ble_evt);
    on_ble_evt(p_ble_evt);
    ble_advertising_on_ble_evt(p_ble_evt);
    bsp_btn_ble_on_ble_evt(p_ble_evt);
    
}


/**@brief Function for the SoftDevice initialization.
 *
 * @details This function initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    uint32_t err_code;
    
    nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;
    
    // Initialize SoftDevice.
    SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);
    
    ble_enable_params_t ble_enable_params;
    err_code = softdevice_enable_get_default_config(CENTRAL_LINK_COUNT,
                                                    PERIPHERAL_LINK_COUNT,
                                                    &ble_enable_params);
    APP_ERROR_CHECK(err_code);
        
    //Check the ram settings against the used number of links
    CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT,PERIPHERAL_LINK_COUNT);
    // Enable BLE stack.
    err_code = softdevice_enable(&ble_enable_params);
    APP_ERROR_CHECK(err_code);
    
    // Subscribe for BLE events.
    err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling events from the BSP module.
 *
 * @param[in]   event   Event generated by button press.
 */
void bsp_event_handler(bsp_event_t event)
{
    uint32_t err_code;
    switch (event)
    {
        case BSP_EVENT_SLEEP:
            sleep_mode_enter();
            break;

        case BSP_EVENT_DISCONNECT:
            err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        case BSP_EVENT_WHITELIST_OFF:
            err_code = ble_advertising_restart_without_whitelist();
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        default:
            break;
    }
}


/**@brief   Function for handling app_uart events.
 *
 * @details This function will receive a single character from the app_uart module and append it to 
 *          a string. The string will be be sent over BLE when the last character received was a 
 *          'new line' i.e '\n' (hex 0x0D) or if the string has reached a length of 
 *          @ref NUS_MAX_DATA_LENGTH.
 */
/**@snippet [Handling the data received over UART] */
void uart_event_handle(app_uart_evt_t * p_event)
{
    static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];
    static uint8_t index = 0;
    uint32_t       err_code;

    switch (p_event->evt_type)
    {
        case APP_UART_DATA_READY:
            UNUSED_VARIABLE(app_uart_get(&data_array[index]));
            index++;

            if (((data_array[index - 2] == '\n') && (data_array[index - 1] == '\r')) || (index >= (BLE_NUS_MAX_DATA_LEN)))
            {
                raw_temp = ((data_array[index - 4] << 8) | data_array[index - 3]);
                if ((ble_state == BLE_CONNECTED) && !beacon_broadcast)
                {
                    err_code = ble_nus_string_send(&m_nus, data_array, index);
                    if (err_code != NRF_ERROR_INVALID_STATE)
                    {
                        APP_ERROR_CHECK(err_code);
                    }
                }
                
                if ((ble_state == BLE_IDLE) && !beacon_broadcast)
                    sensor_start();

                index = 0;
            }
            break;

        case APP_UART_COMMUNICATION_ERROR:
            APP_ERROR_HANDLER(p_event->data.error_communication);
            break;

        case APP_UART_FIFO_ERROR:
            APP_ERROR_HANDLER(p_event->data.error_code);
            break;

        default:
            break;
    }
}
/**@snippet [Handling the data received over UART] */


/**@brief  Function for initializing the UART module.
 */
/**@snippet [UART Initialization] */
static void uart_init(void)
{
    uint32_t                     err_code;
    const app_uart_comm_params_t comm_params =
    {
        RX_PIN_NUMBER,
        TX_PIN_NUMBER,
        RTS_PIN_NUMBER,
        CTS_PIN_NUMBER,
        //APP_UART_FLOW_CONTROL_ENABLED,
        APP_UART_FLOW_CONTROL_DISABLED,
        false,
        UART_BAUDRATE_BAUDRATE_Baud115200
    };

    APP_UART_FIFO_INIT( &comm_params,
                       UART_RX_BUF_SIZE,
                       UART_TX_BUF_SIZE,
                       uart_event_handle,
                       APP_IRQ_PRIORITY_LOW,
                       err_code);
    APP_ERROR_CHECK(err_code);
}
/**@snippet [UART Initialization] */


/**@brief Function for initializing the Advertising functionality.
 */
static void advertising_init(void)
{
    uint32_t      err_code;
    ble_advdata_t advdata;
    ble_advdata_t scanrsp;

    // Build advertising data struct to pass into @ref ble_advertising_init.
    memset(&advdata, 0, sizeof(advdata));
    advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    advdata.include_appearance = false;
    advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

    memset(&scanrsp, 0, sizeof(scanrsp));
    scanrsp.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    scanrsp.uuids_complete.p_uuids  = m_adv_uuids;

    ble_adv_modes_config_t options = {0};
    options.ble_adv_fast_enabled  = BLE_ADV_FAST_ENABLED;
    options.ble_adv_fast_interval = APP_ADV_INTERVAL;
    options.ble_adv_fast_timeout  = APP_ADV_TIMEOUT_IN_SECONDS;

    err_code = ble_advertising_init(&advdata, &scanrsp, &options, on_adv_evt, NULL);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing buttons and leds.
 *
 * @param[out] p_erase_bonds  Will be true if the clear bonding button was pressed to wake the application up.
 */
/*static void buttons_leds_init(bool * p_erase_bonds)
{
    bsp_event_t startup_event;

    uint32_t err_code = bsp_init(BSP_INIT_LED | BSP_INIT_BUTTONS,
                                 APP_TIMER_TICKS(100, APP_TIMER_PRESCALER), 
                                 bsp_event_handler);
    APP_ERROR_CHECK(err_code);

    err_code = bsp_btn_ble_init(NULL, &startup_event);
    APP_ERROR_CHECK(err_code);

    *p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);
}
*/

/**@brief Function for placing the application in low power state while waiting for events.
 */
static void power_manage(void)
{
    uint32_t err_code = sd_app_evt_wait();
    APP_ERROR_CHECK(err_code);
}

// 2015/11/27 Sending iBeacon for iot sensors detection
void beacon_start(uint16_t manu_id, uint16_t major_value, uint16_t minor_value)
{
    uint32_t err_code;
    ble_advdata_t   advdata;

    //app_beacon_scanner_stop();

    if (ble_state == BLE_IDLE)
    {
    ble_advdata_manuf_data_t manuf_specific_data;
    //manuf_specific_data.company_identifier = 0x004C;                            /**< Company identifier for Apple Inc. as per www.bluetooth.org. */
    manuf_specific_data.company_identifier = manu_id;                            /**< Company identifier for Apple Inc. as per www.bluetooth.org. */
	
uint8_t m_beacon_info[0x17] =                     /**< Information advertised by the Beacon. */
{
    0x02,     // Manufacturer specific information. Specifies the device type in this 
                         // implementation. 
    0x15, // Manufacturer specific information. Specifies the length of the 
                         // manufacturer specific data in this implementation.
    APP_BEACON_UUID,     // 128 bit UUID value. 
    major_value, major_value>>8,    // Major arbitrary value that can be used to distinguish between Beacons. 
    minor_value, minor_value>>8,    // Minor arbitrary value that can be used to distinguish between Beacons. 
    0xC8    // Manufacturer specific information. The Beacon's measured TX power in 
                         // this implementation. 
};
    manuf_specific_data.data.p_data        = (uint8_t *) m_beacon_info;                    
    manuf_specific_data.data.size          = 0x17;

    // Build and set advertising data.
    memset(&advdata, 0, sizeof(advdata));

    advdata.name_type               = BLE_ADVDATA_NO_NAME;
    advdata.flags                   = BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED;
    advdata.p_manuf_specific_data   = &manuf_specific_data;

    err_code = ble_advdata_set(&advdata, NULL);
    APP_ERROR_CHECK(err_code);

    // Initialize advertising parameters (used when starting advertising).
    memset(&m_adv_params, 0, sizeof(m_adv_params));

    m_adv_params.type        = BLE_GAP_ADV_TYPE_ADV_NONCONN_IND;
    m_adv_params.p_peer_addr = NULL;                             // Undirected advertisement.
    m_adv_params.fp          = BLE_GAP_ADV_FP_ANY;
    m_adv_params.interval    = MSEC_TO_UNITS(100, UNIT_0_625_MS); /**< The advertising interval for non-connectable advertisement (100 ms). This value can vary between 100ms to 10.24s). */
    //m_adv_params.timeout     = 0;
    m_adv_params.timeout     = 2;           // In second

        beacon_broadcast = true;
        err_code = sd_ble_gap_adv_start(&m_adv_params);
        APP_ERROR_CHECK(err_code);
        //err_code = sd_ble_gap_adv_stop();
        //APP_ERROR_CHECK(err_code);
        nrf_delay_ms(BROADCAST_TIME);
        beacon_broadcast = false;
    }

    //app_beacon_scanner_start();
}

// 2021/07/18
// Max Lu
// Modified for beacon_start for sending sensor data
void sensor_start()
{
    uint32_t err_code;
    ble_advdata_t   advdata;
    uint8_t data[]                      = "123456789"; // Our data to adverise

    if (ble_state == BLE_IDLE)
    {
    ble_advdata_manuf_data_t manuf_specific_data;
    
    data[0] = BEACON_LOC ;	        // Sensor ID
    data[1] = raw_temp >> 4;		                // Temperature
    //data[2] = ach1;		                // Gas detector reading
    //data[3] = ach1 >> 8;
    manuf_specific_data.company_identifier = 0xAAAA; // Max ID
    manuf_specific_data.data.p_data        = data;                    
    manuf_specific_data.data.size          = sizeof(data);

    // Build and set advertising data.
    memset(&advdata, 0, sizeof(advdata));

    advdata.name_type               = BLE_ADVDATA_NO_NAME;
    advdata.flags                   = BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED;
    advdata.p_manuf_specific_data   = &manuf_specific_data;

    err_code = ble_advdata_set(&advdata, NULL);
    APP_ERROR_CHECK(err_code);

    // Initialize advertising parameters (used when starting advertising).
    memset(&m_adv_params, 0, sizeof(m_adv_params));

    m_adv_params.type        = BLE_GAP_ADV_TYPE_ADV_NONCONN_IND;
    m_adv_params.p_peer_addr = NULL;                             // Undirected advertisement.
    m_adv_params.fp          = BLE_GAP_ADV_FP_ANY;
    m_adv_params.interval    = MSEC_TO_UNITS(100, UNIT_0_625_MS); /**< The advertising interval for non-connectable advertisement (100 ms). This value can vary between 100ms to 10.24s). */
    //m_adv_params.timeout     = 0;
    m_adv_params.timeout     = 2;           // In second

        beacon_broadcast = true;
        err_code = sd_ble_gap_adv_start(&m_adv_params);
        APP_ERROR_CHECK(err_code);
        //err_code = sd_ble_gap_adv_stop();
        //APP_ERROR_CHECK(err_code);
        nrf_delay_ms(BROADCAST_TIME);
        beacon_broadcast = false;
    }
}

static void xs_timeout_handler(void * p_context)
{

    UNUSED_PARAMETER(p_context);

    if ((ble_state == BLE_IDLE) && (nrf_gpio_pin_read(LED_1) == 1))
    {
        beacon_start(APP_COMPANY_IDENTIFIER, 0x01, BEACON_LOC);
    }
    
}

static void xm_timeout_handler(void * p_context)
{

    UNUSED_PARAMETER(p_context);

    //if (nrf_gpio_pin_read(LED_4) == 0)
    {
        app_uart_put('t');
    }
}

/**@brief Function for the Timer initialization.
 *
 * @details Initializes the timer module. This creates and starts application timers.
 */
static void timers_init(void)
{
    uint32_t err_code;

    // Initialize timer module.
    APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);

    // 20210714
    // Max Lu
    // 2 seconds interval timer
    err_code = app_timer_create(&m_xs_timer_id,
                                APP_TIMER_MODE_REPEATED,
                                xs_timeout_handler);
    APP_ERROR_CHECK(err_code);
    
    err_code = app_timer_start(m_xs_timer_id, XS_INTERVAL, NULL);
    APP_ERROR_CHECK(err_code);

    err_code = app_timer_create(&m_xm_timer_id,
                                APP_TIMER_MODE_REPEATED,
                                xm_timeout_handler);
    APP_ERROR_CHECK(err_code);
    
    err_code = app_timer_start(m_xm_timer_id, XM_INTERVAL, NULL);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for handling a BeaconScanner event.
 *
 * @details This function will be called each time the scanner has found an advertiser with beacon data.
 *          In this simple implementation, it checks the Major and Minor and company ID fields from the beacon data,
 *          and if they match, @ref BSP_INDICATE_ALERT_3 is indicated. 
 *
 * @param[in]   p_evt   scanner event data.
 */
static void beacon_evt_handler(ble_scan_beacon_evt_t * p_evt)
{

    if((p_evt->rcv_adv_packet.adv_data.major    == SEARCHED_MAJOR)
     &&(p_evt->rcv_adv_packet.adv_data.minor    == SEARCHED_MINOR)
     &&(p_evt->rcv_adv_packet.adv_data.manuf_id == APP_COMPANY_IDENTIFIER))
    {
        //beacon_cnt++;
        advertising_init();
        ble_advertising_start(BLE_ADV_MODE_FAST);
    }
}

/**@brief Function for handling a BeaconScanner error.
 *
 * @param[in]   nrf_error   Error code containing information about what went wrong.
 */
static void beacon_scanner_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}

/**@brief Function for initializing the beacon scanner module.
 */
static void scanner_init()
{
    m_beacon_scanner_init.evt_handler   = beacon_evt_handler;
    m_beacon_scanner_init.error_handler = beacon_scanner_error_handler;
    app_beacon_scanner_init(&m_beacon_scanner_init);
}


/**@brief Function for starting the beacon scanner module.
 */
static void scanner_start()
{
    app_beacon_scanner_start();
}

/**@brief Application main function.
 */
int main(void)
{
    uint32_t err_code;
    //bool erase_bonds;

    // Initialize.
    APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
    uart_init();
    
    //buttons_leds_init(&erase_bonds);
    ble_stack_init();
    gap_params_init();
    services_init();
    advertising_init();
    conn_params_init();

    // 20210714
    // Max Lu
    timers_init();
    nrf_gpio_cfg_input(LED_1, NRF_GPIO_PIN_NOPULL); // Motion detection
    //nrf_gpio_cfg_output(LED_4);
    //nrf_gpio_pin_clear(LED_4);
    nrf_gpio_cfg_input(LED_4, NRF_GPIO_PIN_PULLUP);
    scanner_init();
    scanner_start();
    
    // 2017/05/04 Max Lu
    // Set Tx power, available value -40, -30, -20, -16, -12, -8, -4, 0, 4 dBm
    sd_ble_gap_tx_power_set(4);

    printf("\r\nUART Start!\r\n");
    err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
    APP_ERROR_CHECK(err_code);
    ble_state = BLE_ADVERTISING;
    
    // Enter main loop.
    for (;;)
    {
        power_manage();
    }
}


/** 
 * @}
 */

[Hung Bui]

Hi Max, 

Please explain why you call ble_nus_string_send() , what's it for ? 

So you want to see the beacon data on the phone ? correct ? 

[Max]

Yes, you can say that.

[Hung Bui]

Then please read my reply from the beginning. 
The way we send the data from the nRF52 to the phone is via notification. And there is a limitation of the notification compare to read/write. 

[Max]

My question is to scan for a specific beacon signal in nRF51. How to implement this in nRF51?