set static passkey between two nrf52840 and nrf52832

[syc776]

nrf52840 is ble central ,nrf52832 is ble peripheral,

nrf52832 is modify finish.

but i do not know how assign ble central .

now i use the example(ble_app_uart_c) to implete my project , please tell me how to modify it to set static passkey

i can not get BLE_GAP_EVT_AUTH_KEY_REQUEST vent!

please help me!

thanks for everyone answers!

[Hung Bui]

Hi Syc, 

Before testing with static passkey, it's better to verify that passkey works first. 

I would suggest you to try ble_app_gls example where we have passkey implemented. 

Note that to be able to get passkey working, you would need to configure the SEC_PARAM_IO_CAPABILITIES to have at least BLE_GAP_IO_CAPS_DISPLAY_ONLY (when you want to display the passkey) and BLE_GAP_IO_CAPS_KEYBOARD_ONLY on the other side where the passkey to be entered. 

And SEC_PARAM_MITM should be set to 1. 

[syc776]

thanks your answer！

ble_central can not find ble_app_gls example!

ble peripheral

i can find the example !

but i want to konw how to assign static passkey ble central!

please help me !

[Hung Bui]

I don't have a working example here. But what you need to do is to get familiar with the code inside GLS example, use nRFConnect on the phone or PC to test passkey with it. 

Then you implement the same in ble_app_uart so that when you pair there will passkey pairing. (Follow what I suggested earlier) 

You can follow this Message Sequence Chart to know how it works on the peripheral side: https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.api.v6.0.0/group___b_l_e___g_a_p___p_e_r_i_p_h___l_e_s_c___b_o_n_d_i_n_g___p_k_e___p_d___m_s_c.html?cp=3_4_1_3_2_1_3_10_6_2

On the central side, it should be verify similar, you should follow this chart to implement: 

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.api.v6.0.0/group___b_l_e___g_a_p___c_e_n_t_r_a_l___b_o_n_d_i_n_g___p_k___p_e_r_i_p_h___o_o_b___m_s_c.html?cp=3_4_1_3_2_1_3_5_2_2

This support case discusses similar topic to yours: https://devzone.nordicsemi.com/f/nordic-q-a/14062/ble_app_uart_c-dongle-with-passkey

[syc776]

thanks your answer  !

now i resolve the problem but i meet a new problem  .

ble peripheral  :

I want to modify the static passkey when the device is connect with ble central .

I kown that restart the device ,the passkey can be changed;

but I want no need to power down the device ,I can modify the ble peripheral static passkey .

Please give me some advice!

[Hung Bui]

Please clarify that you can set a certain passkey (static passkey) when pairing. So that you always have the same 6 digits number when you pair. 

After you have that, if you want to change the static passkey, as far as i know you just need to call sd_ble_opt_set() with BLE_GAP_OPT_PASSKEY and the new passkey that you want. Similar to what you have in your original post. 

[syc776]

yes. I do like this ,but call sd_ble_opt_set() return invalid parameters

so maybe have some mistakes ;