Connecting to only one central. How to? detailed

[Antonio]

Hi, i know this question has been ask before but, i was reading and readind and i could find a way to do it. I got the theory but when i'm going to implement it in my code i get confused.

Starting by symple, i have 2 devices, one of this as central and one of this as peripheral.

I need the peripheral only get connected to this specific central and avoide connection to another.

1-. How i can setup an static address to my central? which part of the code i do that?

2-.I know that it is possible to create a whitelist to save bond info about the connection that has been made but i think i don't need it because i only have 1 central and just want to connect to him. wich part of the code i have to writte to set the address of my central in order to only connect to him? What would be this address, the peer addres or another one?

3-. I have read about directed advertising, what i got was that, you use direct adv when you want to connect to a specific central, but again, where do you specify that?

4-. My peripheral could be scannable but i just want my central could connect not any other device.

Maybe these are newbie question, but how i wrote above, i have read and read and i don't find a good explanation to do that.

Sorry and thanks in advance.

[Antonio]

@HungBui: i think i had my code ready, but when the central tries to connect, it gets disconnect..

This is my central device address:

this is my function start_advertising() in main.c

/**@brief Function for starting advertising.
 */
static void advertising_start(void)
{
    uint32_t             err_code;
ble_gap_adv_params_t adv_params;
ble_gap_whitelist_t  whitelist;
ble_gap_addr_t   * p_whitelist_addr[1];
ble_gap_addr_t        whitelist_addr={BLE_GAP_ADDR_TYPE_RANDOM_STATIC,{0x80,0xA5,0x89,0x68,0xAD,0x48}} ;
uint8_t addr[6] = {0x80,0xA5,0x89,0x68,0xAD,0x48};  
uint8_t adv_data[15] = {0x07,0x09,0x4E,0x6F,0x72,0x64,0x69,0x63,0x02,0x01,0x04,0x03,0x03,0x0F,0x18};
uint8_t adv_data_length = 15;

//Setting up the advertising data with scan response data = Null
err_code = sd_ble_gap_adv_data_set(adv_data, adv_data_length, NULL, NULL);    

//Configure the advertising parameter and whitelist
memset(&adv_params, 0, sizeof(adv_params));
adv_params.type        = BLE_GAP_ADV_TYPE_ADV_IND;
adv_params.p_peer_addr = NULL;
adv_params.interval    = 64;
adv_params.timeout     = 180;
p_whitelist_addr[0] = &whitelist_addr;
whitelist.addr_count = 1;
whitelist.pp_addrs   =  p_whitelist_addr;
whitelist.pp_irks = NULL;
whitelist.irk_count =0;
adv_params.fp          = BLE_GAP_ADV_FP_FILTER_CONNREQ;
adv_params.p_whitelist = &whitelist;
err_code = sd_ble_gap_adv_start(&adv_params);
}

and this is my main.c

/**@brief Function for application main entry.
 */
int main(void)
{
	  uint32_t err_code;
	  bool erase_bonds;
		configurar_puerto();
	
//	 leds_init();
//    timers_init();
	
	  // inicializo el timer para mostrar el blinking del advertoising
	  APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
    err_code = bsp_init(BSP_INIT_LED, APP_TIMER_TICKS(100, APP_TIMER_PRESCALER), NULL);
    APP_ERROR_CHECK(err_code);
	
	  
    buttons_init();
//	  nrf_delay_ms(50);
		ble_stack_init();
	
    device_manager_init(erase_bonds);
	  gap_params_init();
    services_init();
    advertising_init();
	  conn_params_init();
	
	// Empiezo el advertizing
//	  err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
//    APP_ERROR_CHECK(err_code);
    advertising_start();
	
	// Espero un evento
    for (;;)
    {
        power_manage();
    }

}

What it could happening?

[Hung Bui]

@Antonio: if you want to add more detail about your question, please edit the question. Don't add it as an answer. It could be the endianess was wrong, you could try to set the direct address /or whitelist in the advertiser to

{0x48,0xAD,0x68,0x89,0xA5,0x80};

You can try to capture a sniffer trace, we can see what is in the advertising packet.