PC Repeat Pair

[bear_xiong]

hi

I use nrf52833 and nRF5_SDK_17.0.2_d674dde HID keyborad demo.

1. I pair PC success first , then I erase_bonds ,and repeat pair my pc. with other  address  but PC do not pair OK. if PC delect pair information, it is ok.

2. the same way   repeat pair  android phone is OK.

3. I add PM_EVT_CONN_SEC_FAILED error is BLE_GAP_SEC_STATUS_UNSPECIFIED. 

4. I add

case PM_EVT_CONN_SEC_CONFIG_REQ:
conn_sec_config.allow_repairing= true;
pm_conn_sec_config_reply(p_evt->conn_handle,&conn_sec_config);

break;

But do not run here.

Maybe Have some reason  please or my PC donot support repear pair?

[Kenneth]

I don't understand why re-pairing does not work, but if you are able to provide an on-air sniffer log (e.g. nrf sniffer), then we might get more information about what the problem may be. You may try to comment out pm_handler_on_pm_evt() in pm_evt_handler(), I have seen this may cause problems.

Regarding changing IRK, the softdevice will by default use the preprogrammed IRK in FICR. It's not possible to change this value, however you can call pm_privacy_set() with the pm_privacy_params_t parameter holding a pointer to a new IRK. Note that you have to store this IRK in flash (for instance using FDS), and make this call after every reset. Also see here:
https://devzone.nordicsemi.com/f/nordic-q-a/47722/the-usage-of-an-irk-for-the-default-setting-and-how-to-change-an-irk-each-bonding-cycle 

Kenneth

[bear_xiong]

Thanks your answer。

I call get and set。 

error =pm_privacy_get(&myparams);
myparams.p_device_irk->irk[0]=0x02;
myparams.p_device_irk->irk[1]=0x02;
error =pm_privacy_set(&myparams);

I want to make sure change OK。 but can not be change。

error =0x0E。

may be give me a example how to have a new IPK？

[Kenneth]

That error code means one of the following:

 * @retval NRF_ERROR_INVALID_STATE         If the Peer Manager is not initialized.

 * @retval ::NRF_ERROR_INVALID_STATE Privacy settings cannot be changed while advertising.

Can you check that you are calling pm_privacy_set() after peer_manager_init() but before advertising_start()?

Kenneth

[bear_xiong]

yes，i am sure ，it is after peer_manager_init ，and before advertising_start。

buffer_init();
peer_manager_init();
// Start execution.
NRF_LOG_INFO("HID Keyboard example started.");
timers_start();

error =pm_privacy_get(&myparams);
myparams.p_device_irk->irk[0]=0x02;
myparams.p_device_irk->irk[1]=0x02;
error =pm_privacy_set(&myparams);

pm_privacy_get(&myparams);

advertising_start(erase_bonds);

[Kenneth]

Maybe you can check out some of these cases:

https://devzone.nordicsemi.com/f/nordic-q-a/74980/unable-to-reconnect-on-windows-if-ble-privacy-turned-on

https://devzone.nordicsemi.com/f/nordic-q-a/51408/how-do-change-the-value-of-irk 

[bear_xiong]

I reference ,but  memcpy(myparams.p_device_irk,irk_v,16) is fail

[Kenneth]

Can you try:

    ret_code_t error;    
    static pm_privacy_params_t myparams;
    static ble_gap_irk_t device_irk;    
    myparams.p_device_irk = &device_irk;

    error =pm_privacy_get(&myparams);
    NRF_LOG_INFO("Error:%x", error);

    myparams.p_device_irk->irk[0]=0x02;
    myparams.p_device_irk->irk[1]=0x02;
    error =pm_privacy_set(&myparams);
    NRF_LOG_INFO("Error:%x", error);

    pm_privacy_get(&myparams);

    advertising_start(erase_bonds);

[bear_xiong]

print log error：0 .

maybe set OK？

My application is

1 .my device pair and bond  notebook （win10）。

2. I use button delect my device address， then use one new address pair bond notebook。（notebook have not delet  pre device bond information  ）

3. notebook can find device （new address） ，but can not pair and bond。

if notebook delet pre bond information， can pair and bond new address device。

so i want to change irk for notebook can repeat pair bond when do not delet pre device。

i am not sure is ok？ or have other way ？

Thanks

[bear_xiong]

Thanks very much.

I try it OK.