EXT ADV Sender/Receiver Problem

Receiver.c

#include <device.h>
#include <devicetree.h>
#include <drivers/gpio.h>
#include <bluetooth/bluetooth.h>

#define TIMEOUT_SYNC_CREATE K_SECONDS(10)
#define NAME_LEN            50

static bool         per_adv_found;
static bt_addr_le_t per_addr;
static uint8_t      per_sid;

static K_SEM_DEFINE(sem_per_adv, 0, 1);
static K_SEM_DEFINE(sem_per_sync, 0, 1);
static K_SEM_DEFINE(sem_per_sync_lost, 0, 1);

static void scan_recv(const struct bt_le_scan_recv_info *info,
		      struct net_buf_simple *buf)
{
	if (!per_adv_found && info->interval) {
		per_adv_found = true;

		per_sid = info->sid;
		bt_addr_le_copy(&per_addr, info->addr);

		k_sem_give(&sem_per_adv);
	}
}

static struct bt_le_scan_cb scan_callbacks = {
	.recv = scan_recv,
};

static void sync_cb(struct bt_le_per_adv_sync *sync,
		    struct bt_le_per_adv_sync_synced_info *info)
{
	k_sem_give(&sem_per_sync);
}

static void term_cb(struct bt_le_per_adv_sync *sync,
		    const struct bt_le_per_adv_sync_term_info *info)
{
	k_sem_give(&sem_per_sync_lost);
}

static void recv_cb(struct bt_le_per_adv_sync *sync,
		    const struct bt_le_per_adv_sync_recv_info *info,
		    struct net_buf_simple *buf)
{
	printk("Hello From recv_cb\n");
}

static struct bt_le_per_adv_sync_cb sync_callbacks = {
	.synced = sync_cb,
	.term = term_cb,
	.recv = recv_cb
};

void main(void)
{
	struct bt_le_per_adv_sync_param sync_create_param;
	struct bt_le_per_adv_sync *sync;
	int err;

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

	bt_le_scan_cb_register(&scan_callbacks);
	bt_le_per_adv_sync_cb_register(&sync_callbacks);

	err = bt_le_scan_start(BT_LE_SCAN_ACTIVE, NULL);
	if (err) {
		printk("failed (err %d)\n", err);
		return;
	}

	do {
		per_adv_found = false;
		err = k_sem_take(&sem_per_adv, K_FOREVER);
		if (err) {
			printk("failed (err %d)\n", err);
			return;
		}
		printk("Found periodic advertising.\n");

		bt_addr_le_copy(&sync_create_param.addr, &per_addr);
		sync_create_param.options = 0;
		sync_create_param.sid = per_sid;
		sync_create_param.skip = 0;
		sync_create_param.timeout = 0xa;
		err = bt_le_per_adv_sync_create(&sync_create_param, &sync);
		if (err) {
			printk("failed (err %d)\n", err);
			return;
		}
		printk("Successfully found periodic advertising sync.\n");

		printk("Waiting for periodic sync...\n");
		err = k_sem_take(&sem_per_sync, TIMEOUT_SYNC_CREATE);
		if (err) {
			printk("failed (err %d)\n", err);

			printk("Deleting Periodic Advertising Sync...");
			err = bt_le_per_adv_sync_delete(sync);
			if (err) {
				printk("failed (err %d)\n", err);
				return;
			}
			continue;
		}
		printk("Periodic sync established.\n");

		printk("Waiting for periodic sync lost...\n");
		err = k_sem_take(&sem_per_sync_lost, K_FOREVER);
		if (err) {
			printk("failed (err %d)\n", err);
			return;
		}
		printk("Periodic sync lost.\n");
	} while (true);
}

Sender.c

#include <bluetooth/bluetooth.h>

static uint8_t adv_data[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10};
#define ADV_DATA_LEN 20

static const struct bt_data ad[] = {
	BT_DATA(BT_DATA_MANUFACTURER_DATA, adv_data, ADV_DATA_LEN),
};

void main(void)
{
	struct bt_le_ext_adv *adv;
	int err;

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

	/* Create a non-connectable non-scannable advertising set */
	err = bt_le_ext_adv_create(BT_LE_EXT_ADV_NCONN_NAME, NULL, &adv);
	if (err) {
		printk("Failed to create advertising set (err %d)\n", err);
		return;
	}

	/* Set periodic advertising parameters */
	err = bt_le_per_adv_set_param(adv, BT_LE_PER_ADV_DEFAULT);
	if (err) {
		printk("Failed to set periodic advertising parameters"
		       " (err %d)\n", err);
		return;
	}

	/* Set periodic advertising data */
	printk("Set Periodic Advertising Data...");
	err = bt_le_per_adv_set_data(adv, ad, ARRAY_SIZE(ad));
	if (err) {
		printk("Failed (err %d)\n", err);
		return;
	}
	printk("done.\n");

	/* Enable Periodic Advertising */
	err = bt_le_per_adv_start(adv);
	if (err) {
		printk("Failed to enable periodic advertising (err %d)\n", err);
		return;
	}

	printk("Start Extended Advertising...");
	err = bt_le_ext_adv_start(adv, BT_LE_EXT_ADV_START_DEFAULT);
	if (err) {
		printk("Failed to start extended advertising "
				"(err %d)\n", err);
		return;
	}
	printk("done.\n");
}