Static Passkey with PCA10028 board and UART example

[haruthakop]

Dear Nordic Developers

I'm using ble_app_uart example with PCA10028 development board. SDK version is 8.0.0. I'm trying to program the PCA10028 board for having a static passkey. Below you can see my modified and added code

define STATIC_PASSKEY   "123456"

static uint8_t          passkey[] = STATIC_PASSKEY;

static void sec_params_init(void)

{

    m_sec_params.bond         = SEC_PARAM_BOND;   
    m_sec_params.mitm         = 1;
    m_sec_params.io_caps      = BLE_GAP_IO_CAPS_DISPLAY_ONLY;
    m_sec_params.oob          = SEC_PARAM_OOB;  
    m_sec_params.min_key_size = SEC_PARAM_MIN_KEY_SIZE;
    m_sec_params.max_key_size = SEC_PARAM_MAX_KEY_SIZE;
		
	ble_opt_t             static_pin_option;
	uint32_t               err_code;    	
	
	static_pin_option.gap_opt.passkey.p_passkey = &passkey[0];
				
	err_code = sd_ble_opt_set(BLE_GAP_OPT_PASSKEY, &static_pin_option);
}

I'm trying to connect using my smartphone (using nRF UART v2.0 application), It connects without asking to type a passkey.

Can you please tell me where I'm wrong? Thanks a lot, looking forward to your responses.

[MartinBL]

Hi,

You will need to add "Man In The Middle" encryption when you set up the characteristics. Look up the rx_char_add() and change

BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.write_perm);

to

BLE_GAP_CONN_SEC_MODE_SET_ENC_WITH_MITM(&cccd_md.write_perm);

Have a look at the Glucose example, ble_app_gls, which uses MITM encryption to learn more. These are also informative post regarding MITM: link and link.

[haruthakop]

Hi, Thanks a lot for your help, I made it running. I'm really sorry for disturbing you again. I have one more question. My device doesn't have any input or output capabilities. Is it against BLE specification to set a static passkey for a pheripheral device which doesn't have any capabilities?

[MartinBL]

Hi, sorry for the late response. I don't think it violates the spec. Here is an interesting thread. And here is even an example on github that uses the ble-app-uart example with static passkey. It uses an old SDK and SD though.

[haruthakop]

Thanks a lot for your help and assistance.

[Nomi]

i am trying to do the same thing but i cant get it to work can you point the mistake i am making.? here is my code pass.zip