How to change Mac address in direction_finding_connectionless_tx example

Question

Hi guys, 
 
 I'm testing AOA function with 
RF52820
cs2.5.0\v2.5.0\zephyr\samples\bluetooth\direction_finding_connectionless_tx example. The locator is the third part device. There is MAC address limit for scanning. So I need to set the required MAC address. Anyone knows how to change code in direction_finding_connectionless_tx example to set MAC address(For example, Change D4:26:59:9A:11:84 to 11:22:33:44:55:66)? Thanks a lot!

Elfving · Answer

Hello, and thank you for your patience.

You can use this snippet a colleague of mine added here. I just tried it myself and got it to change the address in the zephyr sample.

Here is the resulting modified sample code:

/*
 * Copyright (c) 2021 Nordic Semiconductor ASA
 *
 *  SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/types.h>
#include <stddef.h>
#include <errno.h>
#include <zephyr/kernel.h>
#include <zephyr/sys/printk.h>

#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/direction.h>
#include <zephyr/sys/byteorder.h>
#include <zephyr/sys/util.h>


/* Additions below:*/
#include <zephyr/bluetooth/controller.h>
/* Additions above:*/



/* Length of CTE in unit of 8[us] */
#define CTE_LEN (0x14U)
/* Number of CTE send in single periodic advertising train */
#define PER_ADV_EVENT_CTE_COUNT 5

static void adv_sent_cb(struct bt_le_ext_adv *adv,
			struct bt_le_ext_adv_sent_info *info);

static struct bt_le_ext_adv_cb adv_callbacks = {
	.sent = adv_sent_cb,
};

static struct bt_le_ext_adv *adv_set;

static struct bt_le_adv_param param =
		BT_LE_ADV_PARAM_INIT(BT_LE_ADV_OPT_EXT_ADV |
				     BT_LE_ADV_OPT_USE_IDENTITY |
				     BT_LE_ADV_OPT_USE_NAME,
				     BT_GAP_ADV_FAST_INT_MIN_2,
				     BT_GAP_ADV_FAST_INT_MAX_2,
				     NULL);

static struct bt_le_ext_adv_start_param ext_adv_start_param = {
	.timeout = 0,
	.num_events = 0,
};

static struct bt_le_per_adv_param per_adv_param = {
	.interval_min = BT_GAP_ADV_SLOW_INT_MIN,
	.interval_max = BT_GAP_ADV_SLOW_INT_MAX,
	.options = BT_LE_ADV_OPT_USE_TX_POWER,
};

#if defined(CONFIG_BT_DF_CTE_TX_AOD)
static uint8_t ant_patterns[] = {0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xA };
#endif /* CONFIG_BT_DF_CTE_TX_AOD */

struct bt_df_adv_cte_tx_param cte_params = { .cte_len = CTE_LEN,
					     .cte_count = PER_ADV_EVENT_CTE_COUNT,
#if defined(CONFIG_BT_DF_CTE_TX_AOD)
					     .cte_type = BT_DF_CTE_TYPE_AOD_2US,
					     .num_ant_ids = ARRAY_SIZE(ant_patterns),
					     .ant_ids = ant_patterns
#else
					     .cte_type = BT_DF_CTE_TYPE_AOA,
					     .num_ant_ids = 0,
					     .ant_ids = NULL
#endif /* CONFIG_BT_DF_CTE_TX_AOD */
};

static void adv_sent_cb(struct bt_le_ext_adv *adv,
			struct bt_le_ext_adv_sent_info *info)
{
	printk("Advertiser[%d] %p sent %d\n", bt_le_ext_adv_get_index(adv),
	       adv, info->num_sent);
}
/* Additions below:*/
static void set_bt_addr(const char *addr_str, const char *type_str)
{
	int err;
	bt_addr_le_t addr;

	err = bt_addr_le_from_str(addr_str, type_str, &addr);
	if (err) {
		printk("Invalid BT address (err %d)\n", err);
	}

	if (addr.type == BT_ADDR_LE_PUBLIC) {
		printk("set public address\n");
		bt_ctlr_set_public_addr(addr.a.val);
		return;
	} else {
		err = bt_id_create(&addr, NULL);
		if (err < 0) {
			printk("Creating new ID failed (err %d)\n", err);
		}
	}
}
/* Additions above:*/


int main(void)
{
	char addr_s[BT_ADDR_LE_STR_LEN];
	struct bt_le_oob oob_local;
	int err;



	/* Additions below: */
	printk("Attempting to change the address\n");
	set_bt_addr("02:02:02:02:02:02", "public");

	/* Additions above: */

	printk("Starting Direction Finding periodic advertising Beacon Demo\n");

	/* Initialize the Bluetooth Subsystem */
	printk("Bluetooth initialization...");
	err = bt_enable(NULL);
	if (err) {
		printk("failed (err %d)\n", err);
		return 0;
	}
	printk("success\n");

	printk("Advertising set create...");
	err = bt_le_ext_adv_create(&param, &adv_callbacks, &adv_set);
	if (err) {
		printk("failed (err %d)\n", err);
		return 0;
	}
	printk("success\n");

	printk("Update CTE params...");
	err = bt_df_set_adv_cte_tx_param(adv_set, &cte_params);
	if (err) {
		printk("failed (err %d)\n", err);
		return 0;
	}
	printk("success\n");

	printk("Periodic advertising params set...");
	err = bt_le_per_adv_set_param(adv_set, &per_adv_param);
	if (err) {
		printk("failed (err %d)\n", err);
		return 0;
	}
	printk("success\n");

	printk("Enable CTE...");
	err = bt_df_adv_cte_tx_enable(adv_set);
	if (err) {
		printk("failed (err %d)\n", err);
		return 0;
	}
	printk("success\n");

	printk("Periodic advertising enable...");
	err = bt_le_per_adv_start(adv_set);
	if (err) {
		printk("failed (err %d)\n", err);
		return 0;
	}
	printk("success\n");

	printk("Extended advertising enable...");
	err = bt_le_ext_adv_start(adv_set, &ext_adv_start_param);
	if (err) {
		printk("failed (err %d)\n", err);
		return 0;
	}
	printk("success\n");

	printk("Get extended advertising address...");
	err = bt_le_ext_adv_oob_get_local(adv_set, &oob_local);
	if (err) {
		printk("failed (err %d)\n", err);
		return 0;
	}
	printk("success\n");

	bt_addr_le_to_str(&oob_local.addr, addr_s, sizeof(addr_s));

	printk("Started extended advertising as %s\n", addr_s);
	return 0;
}

Regards,

Elfving

How to change Mac address in direction_finding_connectionless_tx example

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