White-list without bond manager

[thomas]

Hi

Is possible to use GAP White-list to restrict connections without the bond manager system ? Just by save the white-list with pstorage.....

for exemple, first open connection: retrieve peer caracteristics with ble_gap_evt_connected_t https://devzone.nordicsemi.com/documentation/nrf51/5.2.0/html/a00225.html

and save them in whitelist... https://devzone.nordicsemi.com/documentation/nrf51/5.2.0/html/a00247.html

[Ole Morten]

Yes, this should be perfectly doable. You can store the address you get in the connected event somewhere in flash, for instance using the pstorage module, and then create a whitelist structure yourself when you want to start advertising again.

[thomas]

Hi,

A part of my code to achieve this :

i've declared a whitelist in global :

static ble_gap_whitelist_t *whitelist;					
static ble_gap_addr_t	*addr_array[BLE_GAP_WHITELIST_ADDR_MAX_COUNT];

In my advertising initialization i want to initialize my whitelist without any pair so i do that ( when the device started the first time) :

whitelist->addr_count = 0x00;
whitelist->pp_addrs = NULL;

second line cause an hardfault and i don't know wy ... Any idea ? It's possible to advertise with an empty whitelist ?

[thomas]

I've changed declaration ( i declared a ble_gap_whitelist_t directly, not a pointer) The Hardfault doesn't occur.

But now, my sd_ble_gap_adv_start function return me the NRF_ERROR_INVALID_PARAM code. So i verified adv_params but i don't find anything..

Do i forgot something ?

static ble_gap_whitelist_t whitelist;					

whitelist.addr_count = 0x00;
whitelist.pp_addrs = NULL;

static void advertising_start(void)
{
    uint32_t             err_code;
    ble_gap_adv_params_t adv_params;

		protection_mode = true;
		connection_state = false;
	
    // Start advertising
    memset(&adv_params, 0, sizeof(adv_params));
    
    dv_params.type        = BLE_GAP_ADV_TYPE_ADV_IND; //adv
    adv_params.p_peer_addr = NULL;
    adv_params.fp          = BLE_GAP_ADV_FP_FILTER_BOTH; // both with whitelist //
    adv_params.interval    = APP_ADV_INTERVAL;
    adv_params.timeout     = APP_ADV_TIMEOUT_IN_SECONDS;
		adv_params.p_whitelist = &whitelist;

    err_code = sd_ble_gap_adv_start(&adv_params);
    APP_ERROR_CHECK(err_code);
 
}

[thomas]

I think i don't build my white-list structure correctly.irk keys adds problems. In all examples, whitelist come from the bond manager.

How to correctly generate a whitelist ? Is possible to use bond manager get whitelist function without the bond operation ?

[Ole Morten]

Unless there is other code you're not showing, this will give you a 0x07 back from sd_ble_gap_adv_start(). The reason is that starting advertising with a filter policy, but an empty whitelist doesn't really make sense. You should therefore make sure to check whether your whitelist actually have any content before you try using a filter policy.