Just Works -- Confirm Value Failed When Pairing

RE: Just Works -- Confirm Value Failed When Pairing

Matt — Thu, 26 Apr 2018 15:47:55 GMT

Hi, Martin:

Slave "sent pairing random" is done in SoftDecive? I only find API "sd_ble_gap_sec_params_reply()", can not find how to "sent pairing random".

RE: Just Works -- Confirm Value Failed When Pairing

Martin Lesund — Wed, 25 Apr 2018 07:51:39 GMT

(sorry for the delay)

What I meant was for you to do this confirm value calculation manually from the Specification document. (It didn't evolve the SDK or Softdevice)

However, It appears that the peer is calculating the confirm value wrong, it should be calculated using the address on air (that's how the Softdevice does it), but the peer is calculating using another address most probably.

RE: Just Works -- Confirm Value Failed When Pairing

Matt — Wed, 18 Apr 2018 15:25:53 GMT

Hi, Martin:

Could you use one of example in SDK to tell me where is the confirm value calculation in the peer?

RE: Just Works -- Confirm Value Failed When Pairing

Martin Lesund — Wed, 18 Apr 2018 14:43:45 GMT

Hi Matt,

The calculation part in SoftDevice should be correct, we believe that the confirm value calculation in the peer is wrong, you can check it manually using the specification.
If you are having any trouble, let me know.

RE: Just Works -- Confirm Value Failed When Pairing

Matt — Wed, 18 Apr 2018 13:39:42 GMT

Hi, Martin:

I think you are right. But the calculating process is done in SoftDevice, is it? How can I check it or modify?

RE: Just Works -- Confirm Value Failed When Pairing

Martin Lesund — Wed, 18 Apr 2018 11:37:08 GMT

Hi Matt,

I am sorry for the delay.

It is most probably a peer issue calculating the confirm value wrong on the peer device that is sending the pairing request.

Could you check that up with your peer device and also provide any new information about your findings?

RE: Just Works -- Confirm Value Failed When Pairing

Matt — Sat, 07 Apr 2018 10:07:18 GMT

Hi, Martin:

Please check the Sniffer data. "Pairing request, pairing response, pairing confirm" are right, but "sent pairing random" is responsed with "confirm value failed", what is the problem, and is it done in SoftDevice?

RE: Just Works -- Confirm Value Failed When Pairing

Martin Lesund — Fri, 06 Apr 2018 12:35:48 GMT

Hi Matt,

Sorry for the long delay.

Have you had any progress in your research? Any changes or anything you could update me on.

If you haven't I would recommend you to look at the Heart Rate Application in the SDK to see how Just Works with pairing/bonding works.

Message sequence charts.

What is the peripheral and central in your testing?

(helpful thread)

RE: Just Works -- Confirm Value Failed When Pairing

Matt — Thu, 29 Mar 2018 02:55:28 GMT

Hi, Martin:

Do you have any suggestion?

RE: Just Works -- Confirm Value Failed When Pairing

Matt — Sat, 24 Mar 2018 07:30:06 GMT

Hi, Martin:

I modify as below:

keys_exchanged.keys_central.p_enc_key  = &central_peer_enc_key;
keys_exchanged.keys_central.p_id_key   = &m_peer_table[m_connection_table[index].bonded_dev_id].peer_id; 
keys_exchanged.keys_central.p_sign_key = NULL;
keys_exchanged.keys_periph.p_enc_key   = &m_bond_table[index].peer_enc_key;
keys_exchanged.keys_periph.p_id_key    = NULL;
keys_exchanged.keys_periph.p_sign_key  = NULL;

err_code = sd_ble_gap_sec_params_reply(p_ble_evt->evt.gap_evt.conn_handle,
                                       BLE_GAP_SEC_STATUS_SUCCESS,
                                       &m_application_table[0].sec_param, 
                                       &keys_exchanged);

if (err_code != NRF_SUCCESS)
{
    DM_LOG("[DM]: Security parameter reply request failed, reason 0x%08X.\r\n", err_code);
    event_result = err_code;
    notify_app   = false;
}

But after bonding successfully several times, it still return Confirm Value Failed error. Please check the Sniffer data:

devzone.nordicsemi.com/.../ng_2D00_android2.pcapng

RE: Just Works -- Confirm Value Failed When Pairing

Matt — Fri, 23 Mar 2018 16:19:19 GMT

Because in file "device_manager_peripheral.c", before call "sd_ble_gap_sec_params_reply()", there are "keys_exchanged.keys_central.p_enc_key = NULL;" , so it will return error NRF_ERROR_INVALID_ADDR.

I will modify it to test more.

RE: Just Works -- Confirm Value Failed When Pairing

Martin Lesund — Fri, 23 Mar 2018 14:32:30 GMT

What does sd_ble_gap_sec_params_reply() return?

RE: Just Works -- Confirm Value Failed When Pairing

Matt — Fri, 23 Mar 2018 14:01:18 GMT

Hi, Martin:

I try it before, sd_ble_gap_sec_params_reply() will return error, not response to master.

RE: Just Works -- Confirm Value Failed When Pairing

Martin Lesund — Fri, 23 Mar 2018 13:37:40 GMT

sec_param.kdist_central.enc  = 0;

Change 'enc' (Long Term Key and Master Identification) to:

sec_param.kdist_central.enc  = 1;

(I would recommend you to use the macros and true/false, instead of just numbers)

RE: Just Works -- Confirm Value Failed When Pairing

Matt — Fri, 23 Mar 2018 13:20:19 GMT

Hi, Martin:

I have searched and checked all the questions in Q&A firstly, but not helpful.

Please check the Sniffer data, the Pairing Response is Just Works's parameters.

Below is my sec_param setting:

sec_param.bond         = 1;
sec_param.mitm         = 0;
sec_param.io_caps      = 3;
sec_param.oob          = 0;
sec_param.min_key_size = 7;
sec_param.max_key_size = 16;
sec_param.kdist_central.enc  = 0;
sec_param.kdist_central.id   = 1;
sec_param.kdist_central.sign = 0;
sec_param.kdist_periph.enc   = 1;
sec_param.kdist_periph.id    = 1;    
sec_param.kdist_periph.sign  = 0;

RE: Just Works -- Confirm Value Failed When Pairing

Martin Lesund — Fri, 23 Mar 2018 12:59:16 GMT

Hello Matt,

Could you check out these similar threads and see if they are of any help?

Are you sure that you have set up the "just works" correctly?