BLE observer - address scan filter problem

Question

I am currently trying to create a simple BLE observer which listens to advertisement broadcasts from a specific device (given via address). I attached the source code below.

My problem is that I am unable to add the address filter. In more detail: as soon as I run the code on the 5340dk, it logs "<err> logger: Scanning filters cannot be set (err -12)" (see screenshot) which is caused by the failure of the bt_scan_filter_add() function. Does anyone have an idea why this add of the filter may fail? Thanks!

#include <zephyr.h>
#include <zephyr/types.h>
#include <stddef.h>
#include <sys/util.h>
#include <sys/byteorder.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/uuid.h>
#include <bluetooth/gatt.h>
#include <bluetooth/hci.h>
#include <bluetooth/scan.h>
#include <bluetooth/gatt_dm.h>

#include <logging/log.h>
LOG_MODULE_REGISTER(logger);

static void scan_filter_match(struct bt_scan_device_info *device_info,
			      struct bt_scan_filter_match *filter_match,
			      bool connectable) {
	char addr[BT_ADDR_LE_STR_LEN];
	bt_addr_le_to_str(device_info->recv_info->addr, addr, sizeof(addr));
	LOG_INF("Filters matched. Address: %s connectable: %d",
		log_strdup(addr), connectable);
}

BT_SCAN_CB_INIT(scan_cb, scan_filter_match, NULL, NULL, NULL);

static int scan_init(void)
{
	int err;
	bt_scan_init(NULL);
	bt_scan_cb_register(&scan_cb);

	bt_addr_t addr ={ { 0xf0, 0xca, 0xf0, 0xca, 0x00, 0x02 }};
	bt_addr_le_t addr_le = { .type = BT_ADDR_LE_PUBLIC, .a = addr };
	err = bt_scan_filter_add(BT_SCAN_FILTER_TYPE_ADDR, &addr_le);
	if (err) {
		LOG_ERR("Scanning filters cannot be set (err %d)", err);
		return err;
	}

	err = bt_scan_filter_enable(BT_SCAN_ADDR_FILTER, false);
	if (err) {
		LOG_ERR("Filters cannot be turned on (err %d)", err);
		return err;
	}

	LOG_INF("Scan module initialized");
	return err;
}

void main(void)
{
	/* Initialize the Bluetooth Subsystem */
	int err = bt_enable(NULL);
	if (err) {
		LOG_ERR("Bluetooth init failed (err %d)\n", err);
	}

	LOG_INF("Bluetooth initialized");

	/* Start Bluetooth Scanning */
	err = scan_init();
	if (err) {
		LOG_ERR("Failed to initialize BLE scan");
	}

	err = bt_scan_start(BT_SCAN_TYPE_SCAN_ACTIVE);
	if (err) {
		LOG_ERR("Scanning failed to start (err %d)", err);
	}

	LOG_INF("Scanning successfully started");
}

GatCode · Accepted Answer

Aah thank you very much! I forgot to add the following line to the proj.conf file. CONFIG_BT_SCAN_ADDRESS_CNT=1

BLE observer - address scan filter problem

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