nRF52840, Pairing through passkey

[valeriy_simakov]

Hello, 

I have the peripheral BLE device. It is always had different mac addresses on disconnection/on reboot.

I use my mobile phone with Android OS to initiate pairing. 
On the device I can see passkey - 6 digits. So I use them on my mobile phone to finish pairing. 
Also, I have a software on my mobile phone for communication with that device. I did sniffering of their communication, 

My idea is to communicate with this device from my device(nRF52840) as central device.

But I stuck on the pairing stage. After I get in 'connected' callback, how can I correctly initiate pairing procedure from my side?

Could you please navigate me for any example / docs?

connect02.pcapng

[Amanda Hsieh]

Hi, 

My colleague Kenneth explains how you can enable static passkey pairing on the peripheral and central in this thread:  Zephyr BLE static passkey between central and peripheral on two nrf52840s. 

Regards,
Amanda H.

[valeriy_simakov]

Hi,

But my case isn't about a static passkey. It's a dynamic passkey)
Actually, I did pairing.
I used bt_conn_auth_passkey_entry() to enter the passkey for the corresponding connection. But it would be better to see an example..

[Amanda Hsieh]

Hi, 

You can take a look at this example Central UART and test with Peripheral UART. 

-Amanda H.

[valeriy_simakov]

Hi, 
Thanks, I will take a look

[valeriy_simakov]

Hi, 
I have a problem with pairing. For some reason, a got an issue in callback 'security_changed '. 

static bt_conn_cb conn_cb{

        .security_changed = OnSecurityChanged,

};

void Ble::OnSecurityChanged(bt_conn* conn, bt_security_t level, bt_security_err err)

{

    char addr[BT_ADDR_LE_STR_LEN];

    bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));

    if (!err)

    {

        printk("Security is changed: %s level %u\n", addr, level);

    }

    else

    {

        printk("Security is failed: %s level %u err %d\n", addr, level, err);

    }

}

So, I got in the log
'Security is failed: 5A:B2:93:34:7A:61 (random) level 1 err 9.'

But sometimes I didn't get that issue and pairing ends successfully.

ncs v2.1.2