"Pairing rejected by Nordic_HRM"

[Priyajit]

While I am going to pair with my android 9 Asus mobile phone with SDK 17 nRF52840. It in my mobile showing "Pairing rejected by Nordic_HRM". After that  I have added a some code line to

static void peer_manager_init(bool erase_bonds);

sec_param.bond = false;

sec_param.mitm = false;

sec_param.lesc = 0;

sec_param.keypress = 0;

sec_param.io_caps = BLE_GAP_IO_CAPS_NONE;

sec_param.oob = false;

sec_param.min_key_size = 7;

sec_param.max_key_size = 16;

sec_param.kdist_own.enc = 0;

sec_param.kdist_own.id = 0;

sec_param.kdist_peer.enc = 0;

sec_param.kdist_peer.id = 0;

And getting same "Pairing rejected by Nordic_HRM"

After that I have added this code,

sec_param.bond = true;
sec_param.mitm = false;
sec_param.lesc = 0;
sec_param.keypress = 0;
sec_param.io_caps = BLE_GAP_IO_CAPS_NONE;
sec_param.oob = false;
sec_param.min_key_size = 7;
sec_param.max_key_size = 16;
sec_param.kdist_own.enc = 1;
sec_param.kdist_own.id = 1;
sec_param.kdist_peer.enc = 1;
sec_param.kdist_peer.id = 1;

And getting same "Pairing rejected by Nordic_HRM"

Please give some solution.

[Simonr]

Hi

There are a few ways around this. The simplest one is likely to just erase bonding information on the nRF side as well upon a reset of the device, via a button, or whenever it fails to connect due to rejected pairing. deleting bonds can be done by a function like this for example.

static void delete_bonds(void)
{
    ret_code_t err_code;

    NRF_LOG_INFO("Erase bonds!");

    err_code = pm_peers_delete();
    APP_ERROR_CHECK(err_code);
}

Note that most examples, by default, checks during start-up if button 2 on the DK is pressed down, and if true calls this delete_bonds() function.

Best regards,

Simon

[Priyajit]

Thank you Simon. It is working properly. After forget from my Asus mobile device end when I am try to connect for first time notification like, "Couldn't pair with Nordic_HRM because of an incorrect PIN or passkey" is coming. Second time when I am try to pair from my asus mobile device it pairs successfully.

Please help.