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");
}
