Scan response data to be added to SDK ble_app_beacon example

RE: Scan response data to be added to SDK ble_app_beacon example

Ameer Usman — Tue, 01 Oct 2019 05:40:22 GMT

The code my Wim has been of great help and I compiled it into a main.c file:
devzone.nordicsemi.com/.../75018.main.c

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Also do not forget to change this in sdk_config.h

#define NRF_SDH_BLE_PERIPHERAL_LINK_COUNT 1 //was previously 0

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and if you get an error code 0x04 at the below code (you can trace it via debugging):

err_code = nrf_sdh_ble_enable(&ram_start);
APP_ERROR_CHECK(err_code);

Then you need to change the RAM_START and RAM_SIZE (this link can guide you to it :https://devzone.nordicsemi.com/f/nordic-q-a/34853/nrf_shd_ble_enable-function-error-code-4-no-memeory-for-operation)

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Do not hesitate to ask any information if needed by anyone 🙂

RE: Scan response data to be added to SDK ble_app_beacon example

Ameer Usman — Mon, 30 Sep 2019 11:52:54 GMT

Added m_enc_scan_response_data by:

static uint8_t              m_enc_scan_response_data[BLE_GAP_ADV_SET_DATA_SIZE_MAX];

Also add:

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

#define APP_ADV_DURATION                18000

But I am still having an error at :

    err_code = sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
    APP_ERROR_CHECK(err_code);

With error code 0x12

and if I change:

#define NRF_SDH_BLE_PERIPHERAL_LINK_COUNT 1 //was 0 - AUAK in sdk_config.h

It gives an error at:

    err_code = nrf_sdh_ble_enable(&ram_start);
    APP_ERROR_CHECK(err_code);

with error code = 0x04

Would greatly appreciate help on this and do not hesitate to clarify any information.

RE: Scan response data to be added to SDK ble_app_beacon example

Ameer Usman — Mon, 30 Sep 2019 11:15:30 GMT

In this code when it says m_enc_scan_response_data is undeclared.

If possible can you please share your main.c file, would greatly help indeed.

RE: Scan response data to be added to SDK ble_app_beacon example

Wim — Thu, 30 Aug 2018 14:12:16 GMT

Also do not forget to change these lines (if not yet done):

static ble_gap_adv_data_t m_adv_data =
{
    .adv_data =
    {
        .p_data = m_enc_advdata,
        .len    = BLE_GAP_ADV_SET_DATA_SIZE_MAX
    },
    .scan_rsp_data =
    {
        .p_data = m_enc_scan_response_data, //was NULL,
        .len    = BLE_GAP_ADV_SET_DATA_SIZE_MAX // was 0

    }
};

RE: Scan response data to be added to SDK ble_app_beacon example

Joakim Jakobsen — Thu, 30 Aug 2018 13:18:25 GMT

Hi.

Thanks for sharing your solution, so that others might benefit from it.

Best regards,
Joakim.

RE: Scan response data to be added to SDK ble_app_beacon example

Wim — Wed, 29 Aug 2018 14:01:49 GMT

I forgot a few lines of code:

data-mode="c_cpp">#define APP_BEACON_INFO_LENGTH 0x17 /**< Total length of information advertised by the Beacon. */ 0x15 /**< Length of manufacturer specific data in the advertisement. */ 0x02 /**< 0x02 refers to Beacon. */ 0xC3 /**< The Beacon's measured RSSI at 1 meter distance in dBm. */ 0x0059 /**< Company identifier for Nordic Semiconductor ASA. as per www.bluetooth.org. */ 0x01, 0x02 /**< Major value used to identify Beacons. */ 0x03, 0x04 /**< Minor value used to identify Beacons. */ 0x01, 0x12, 0x23, 0x34, \ 0x45, 0x56, 0x67, 0x78, \ 0x89, 0x9a, 0xab, 0xbc, \ 0xcd, 0xde, 0xef, 0xf0 /**< Proprietary UUID for Beacon. */ IN_BEACON_INFO 18 /**< Position of the MSB of the Major Value in m_beacon_info array. */ m_beacon_info[APP_BEACON_INFO_LENGTH] = /**< Information advertised by the Beacon. */ // Manufacturer specific information. Specifies the device type in this // implementation. // Manufacturer specific information. Specifies the length of the // manufacturer specific data in this implementation. // 128 bit UUID value. // Major arbitrary value that can be used to distinguish between Beacons. // Minor arbitrary value that can be used to distinguish between Beacons. // Manufacturer specific information. The Beacon's measured TX power in // this implementation.

RE: Scan response data to be added to SDK ble_app_beacon example

Wim — Wed, 29 Aug 2018 13:46:17 GMT

Hi Joakim,

I was looking how to program:

- iBeacon (to be recognized by iOS)

- with scan response data (for additional measurement or other data)

- and connectable (to act as normal BLE peripheral)

I succeeded (after combining your info and single stepping through some code)

Here is my example:

static void advertising_init(void)
{
    uint32_t    err_code;
    uint8_t index;
    uint8_t ch_array[10];
    uint16_t major_value;
    uint16_t minor_value;
    ble_advdata_t advdata;
    ble_advdata_t srdata;
    ble_advdata_manuf_data_t manuf_specific_data;
    ble_advdata_service_data_t service_data_array;

    //Compose iBeacon data. Put the measurement data as major_value and minor_value
    manuf_specific_data.company_identifier = APP_COMPANY_IDENTIFIER; //Apple iBeacon. Others are not recognized by iOS
    index = MAJ_VAL_OFFSET_IN_BEACON_INFO;
    m_beacon_info[index++] = 0xab;//MSB_16(major_value);
    m_beacon_info[index++] = 0xcd;//LSB_16(major_value);
    m_beacon_info[index++] = 0xef;//MSB_16(minor_value);
    m_beacon_info[index++] = MyTime; //LSB_16(minor_value);
    manuf_specific_data.data.p_data = (uint8_t *) m_beacon_info;
    manuf_specific_data.data.size   = APP_BEACON_INFO_LENGTH;

    // Build and set advertising data: flags, manufacturer_specific_data
    memset(&advdata, 0, sizeof(advdata));
    advdata.name_type             = BLE_ADVDATA_NO_NAME; //name will be included in scan response data
    advdata.flags                 = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
    advdata.p_manuf_specific_data = &manuf_specific_data;

    // Build and set scan response data: name, service_data
    memset(&srdata, 0, sizeof(srdata));
    srdata.name_type             = BLE_ADVDATA_SHORT_NAME;
    srdata.short_name_len = 3; // Advertise only first 3 letters of name
    ch_array[0] = 0; //eight interesting bytes
    ch_array[1] = 1;
    ch_array[2] = 2;
    ch_array[3] = 3;
    ch_array[4] = 4;
    ch_array[5] = 5;
    ch_array[6] = 6;
    ch_array[7] = 7;
    service_data_array.service_uuid = 0x5678; //16 bit UUID still TBD
    service_data_array.data.size = 8; 
    service_data_array.data.p_data = ch_array; 
    srdata.service_data_count = 1;
    srdata.p_service_data_array = &service_data_array;

    // Initialize advertising parameters (used when starting advertising).
    memset(&m_adv_params, 0, sizeof(m_adv_params));
    m_adv_params.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED;
    m_adv_params.p_peer_addr     = NULL;    // Undirected advertisement.
    m_adv_params.filter_policy   = BLE_GAP_ADV_FP_ANY;
    m_adv_params.interval        = NON_CONNECTABLE_ADV_INTERVAL;
    m_adv_params.duration        = 0;       // Never time out.
    m_adv_params.primary_phy     = BLE_GAP_PHY_1MBPS;
    m_adv_params.duration        = APP_ADV_DURATION;
    m_adv_params.interval        = APP_ADV_INTERVAL;

    //First encode the advertisement data
    err_code = ble_advdata_encode(&advdata, m_adv_data.adv_data.p_data, &m_adv_data.adv_data.len);
    APP_ERROR_CHECK(err_code);
    //Now encode the scan response data
    err_code = ble_advdata_encode(&srdata, m_adv_data.scan_rsp_data.p_data, &m_adv_data.scan_rsp_data.len);
    APP_ERROR_CHECK(err_code);

    err_code = sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &m_adv_params);
    APP_ERROR_CHECK(err_code);
    
    nrf_gpio_pin_toggle(NRF_GPIO_PIN_MAP(0, 30));
}

Now my advertisement data is:

02:01:06:1A:FF:59:00:02:15:01:12:23:34:45:56:67:78:89:9A:AB:BC:CD:DE:EF:F0:AB:CD:EF:00:C3

And the scna response data is:

0B:16:78:56:00:01:02:03:04:05:06:07:04:08:45:50:50

I hope it can help other programmers.

Best regards,

Wim

RE: Scan response data to be added to SDK ble_app_beacon example

Joakim Jakobsen — Wed, 01 Aug 2018 15:44:50 GMT

[quote user="Wim"]Where can I change the first 14 bytes? Is that a 128 bit UUID? Where is it set?[/quote]

One of my colleagues has made custom service tutorial available on github.

This tutorial is updated to SDK v15.0.0 and you could take a look at that to a better understanding on how the UUID is added to the BLE stack.

Cheers.

RE: Scan response data to be added to SDK ble_app_beacon example

Joakim Jakobsen — Wed, 01 Aug 2018 15:41:24 GMT

Not sure what you are trying to acheive here?

Do you want to change the 128-bit UUID that is already added to the BLE stack's table?

You can take a look at the ble_advdata_t struct to see which data can be added to the scan response data.

As an example:

If we want to transmit the TX-power level in the scan response packet (And not the Vendor Specific UUID) of the ble_app_uart example:

static void advertising_init(void)
{
    uint32_t               err_code;
    ble_advertising_init_t init;
    int8_t tx_power = -4;

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

    init.advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance = false;
    init.advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

    //init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    //init.srdata.uuids_complete.p_uuids  = m_adv_uuids;
    init.srdata.p_tx_power_level =  &tx_power; 

    init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;
    init.evt_handler = on_adv_evt;

    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}

Let me know if I misunderstood something or you have further questions.

Best regards,
Joakim.

RE: Scan response data to be added to SDK ble_app_beacon example

Wim — Fri, 27 Jul 2018 12:00:41 GMT

But in that way, I can only change the bytes "01:00" at the end of the scan response data.

For example:

static ble_uuid_t m_adv_uuids[] =   /**< Universally unique service identifier. */
{
//original:    {BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE}
    {0x5678, NUS_SERVICE_UUID_TYPE} //Now 78:56 in the scan response data
};

Where can I change the first 14 bytes? Is that a 128 bit UUID? Where is it set?

(I looked at your tutorial, but the API's of the older SDKs are different from version 15. And the older SDKs have no support for Segger Embedded Studio)

Thanks for your help!

RE: Scan response data to be added to SDK ble_app_beacon example

Joakim Jakobsen — Tue, 24 Jul 2018 08:33:02 GMT

Hi.

If you take a look at line 613-614 of the main.c file.

The ble_app_uart adds the 128-bit UUID to the scan response packet.

If you didn't already, I would suggest that you take a look at the tutorial I referred to in my previous answer.

Best regards,
Joakim.

RE: Scan response data to be added to SDK ble_app_beacon example

Wim — Wed, 18 Jul 2018 08:55:25 GMT

I have looked into the ble_app_uart example, but I cannot find the line(s) where the scan response data is set.

I receive

Advertisement data: 02:01:05:0C:09:4E:6F:72:64:69:63:5F:55:41:52:54 (here at the end is Nordic_UART)

Scan response data: 11:07:9E:CA:DC:24:0E:E5:A9:E0:93:F3:A3:B5:01:00:40:6E

But where is the scan response data in the code?

Thanks for your help!

RE: Scan response data to be added to SDK ble_app_beacon example

Wim — Wed, 18 Jul 2018 06:48:05 GMT

I use SDK 15.0.0, softdevice S132, board nRF6827 Rev. 1.2.1 (nRF52 Development kit), PCA 10040, Segger embedded studio for ARM Release 3.34a

RE: Scan response data to be added to SDK ble_app_beacon example

Joakim Jakobsen — Tue, 17 Jul 2018 14:54:16 GMT

Hi!

The approach might vary depending on what version of the SDK you are working with.

Maybe you could provide a little more information?

SDK version, what device, softdevice version etc. is useful information to add in your questions.

However, you can take a look at our advertising tutorial, and the chapter about the Scan response data.
The tutorial is from one of the older SDK but the approach will be similiar.

Also, the ble_app_uart example adds data to the scan reponse packet, so you can get an idea of how it's done.

Let me know if you have any further questions.
Best regards,
Joakim.