Central_multilink and scanning filter

[PW]

Hello. 

I try to add scanning filter to central_multilink example from Zephyr examples. Filter is set to short_name, I added filter settings just before start scanner.

static void start_scan(void)
{
	struct bt_le_scan_param scan_param = {
		.type       = BT_HCI_LE_SCAN_PASSIVE,
		.options    = BT_LE_SCAN_OPT_NONE,
		.interval   = SCAN_INTERVAL,
		.window     = SCAN_WINDOW,
	};
	int err;

	struct bt_scan_short_name myname;

	myname.name="DEVX";
	myname.min_len=7;
	
	err = bt_scan_filter_add(BT_SCAN_FILTER_TYPE_SHORT_NAME, &myname);
	if (err) 
	{
		printk("\nScanning filters cannot be set (err %d)\n", err);
	}

	err = bt_scan_filter_enable(BT_SCAN_SHORT_NAME_FILTER, false);
	if (err) 
	{
		printk("\nFilters cannot be turned on (err %d)\n", err);
	}

	err = bt_le_scan_start(&scan_param, device_found);
	if (err) 
	{
		printk("Scanning failed to start (err %d)\n", err);
		return;
	}

	printk("Scanning successfully started\n");
}

 

 Unfortunatelly it doesn't work. If I set in prj.conf: 

CONFIG_BT_SCAN_SHORT_NAME_CNT=1

application return: Scanning filters cannot be set (err -12)

I try to set:

CONFIG_BT_SCAN_SHORT_NAME_CNT=2

but scanner connect to every device.

I increased heap and stack but it doeasn't help.

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096

CONFIG_HEAP_MEM_POOL_SIZE=4096

My questions:

1. Can I use NCS lib in example from Zephyr? (which I did)

2. What memory is te problem in err -12 ?

Best regards

PW

 

[PW]

Hi ropz. 

I decided to use UUID filter and it works very good.

static int scan_init(void)
{
	int err;
	struct bt_scan_init_param scan_init = {
		.connect_if_match = 0,
		.scan_param = BT_LE_SCAN_PARAM(
					  BT_HCI_LE_SCAN_PASSIVE,
					  BT_LE_SCAN_OPT_NONE,
					  SCAN_INTERVAL,
					  SCAN_WINDOW)
	};

	bt_scan_init(&scan_init);
	bt_scan_cb_register(&scan_cb);

	err = bt_scan_filter_add(BT_SCAN_FILTER_TYPE_UUID, BT_MY_UUID_SERVICE);
	if (err) 
	{
		LOG_ERR("Scanning filters cannot be set (err %d)", err);
		return err;
	}

	err = bt_scan_filter_enable(BT_SCAN_UUID_FILTER, false);
	if (err) 
	{
		LOG_ERR("Filters cannot be enabled (err %d)", err);
		return err;
	}

	LOG_INF("Scan init OK");
	return err;
}

Best regards

PW

[ropz]

Thanks PW, I make it work. Thanks for your help!