ble pair confusion

[yiran]

Now I am working on ble_app_uart project. For security reason, I don't want any unaccepted mobile phone connecting to my peripheral device.

From this post link text, I found this

By setting IO capabilities to BLE_GAP_IO_CAPS_NONE the iPhone won't ask for a passkey to be entered. However, if you want to use passkey in your application, you can for example use the UART to enter the passkey on your connected PC and transmit the passkey to the PCA10001.

In practice, it shows 'connection is rejected' when I try to use mobile phone to connect to dongle running ble_app_uart, while connecting with nrf uart app still works. I wanna know why uart app works and why 'connection is rejected' happens. And if I want to enhance security level, I should leave 'connection is rejected' happening, or use a passkey?

[Petter Myhre]

What shows that the connection is rejected? Another app? What kind of security are you after?

[yiran]

BLE_ADV_MODE_FAST mode, no more security set. The default mobile phone bluetooth function shows the reject info. my complete code is here github.com/.../main.clink text

[Petter Myhre]

The unmodifed ble_app_uart example doesn't support pairing. The nrf uart app will not try to pair, so it works. But if you try to connect from Bluetooth settings it will try to pair, and the ble_app_uart will reply with pairing not supported:

 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;

[yiran]

Thank you very much! I miss this line probably.

[Darshan]

Though this example does not support pairing is there any other way or changes to be made in BLE_GAP_EVT_SEC_PARAMS_REQUEST to support pairing.Or any reference example in sdk which supports pairing.