RE: BLE connection through MAC Address Issue.

RSA — Wed, 08 Jan 2020 10:10:06 GMT

what solved the issue was for some reason removing the sd_ble_gap_addr_set()

RE: BLE connection through MAC Address Issue.

Simon — Wed, 08 Jan 2020 00:55:32 GMT

I was able to achieve this in the following manner:

I modified the examples examples\ble_peripheral\ble_app_blinky and examples\ble_central\ble_app_blinky_c
In examples\ble_peripheral\ble_app_blinky I did the following:
- Built and flashed the example without modifying it
  - If I understand you right, you want to connect to the device based on the unique MAC address. By default, this address will be included in the advertising packet (no need to add it through sd_ble_gap_addr_set()).
- The blinky peripheral device is now advertising, and I used the nRF Connect app on my phone to check what the device/mac address was:

In the examples\ble_central\ble_app_blinky_c I did the following:
- Added address filtering based on the findings above:

static ble_gap_addr_t const mac_addr =
    {
        .addr_type = BLE_GAP_ADDR_TYPE_RANDOM_STATIC,
        .addr = {0x4C, 0x9E, 0xFE, 0x20, 0x83, 0xD4}
};


static void scan_init(void)
{
    ret_code_t          err_code;
    nrf_ble_scan_init_t init_scan;

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

    init_scan.connect_if_match = true;
    init_scan.conn_cfg_tag     = APP_BLE_CONN_CFG_TAG;

    err_code = nrf_ble_scan_init(&m_scan, &init_scan, scan_evt_handler);
    APP_ERROR_CHECK(err_code);

    // Setting filters for scanning.
    err_code = nrf_ble_scan_filters_enable(&m_scan, NRF_BLE_SCAN_ADDR_FILTER, false);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_ADDR_FILTER, mac_addr.addr);
    APP_ERROR_CHECK(err_code);
}

[quote userid="82673" url="~/f/nordic-q-a/55724/ble-connection-through-mac-address-issue/227843"]A thing i have noticed is that a 0 is attached in the avertissement header and that the address is mirrored, why is this? [/quote]

I think this is related to the specific address type. Since you set it to BLE_GAP_ADDR_TYPE_PUBLIC in the peripheral example, the MSBits was set to '0'. Read more about this in these links:

Best regards,

Simon

RE: BLE connection through MAC Address Issue.

RSA — Tue, 07 Jan 2020 10:17:49 GMT

The change unfortunately did not fix the issue.

A thing i have noticed is that a 0 is attached in the avertissement header and that the address is mirrored, why is this?

RE: BLE connection through MAC Address Issue.

Simon — Thu, 02 Jan 2020 11:18:40 GMT

In the scan setup, try changing the following line:

err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_ADDR_FILTER, m_mac_filter.addr);

to the following:

err_code = nrf_ble_scan_filter_set(&m_scan, SCAN_ADDR_FILTER, mac_addr.addr);

Swap m_mac_filter with mac_addr

Best regards,

Simon