Random MAC after RESET - NRF52832

[tcpipchip]

Describe the bug
I implemented a Beacon using NRF52832 to broadcast the BME680 data!
All the time that i reset the NRF52832, a different MAC is detected my BLE SCANNER.

To Reproduce
Reseting the ZEPHYR, the BLE SCANNER detects different MAC.
Expected behavior
Allways the Same MAC

Impact
I had to use the CHIP ID to identify my ZEPHYR module and broadcast it!

log

⸮Scanning...
Advertised Device: Name: , Address: 53:82:42:2c:76:80, manufacturer data: 060001092002c26e567ce60e5aa77c136ea14dd8b4c1c0c631b49fe438
Advertised Device: Name: , Address: 2b:76:14:04:16:2a, manufacturer data: 59000000001f000000650000003d000052b264000000b34fc9f8
Devices found: 2
Scan done!

After reset, changed the MAC :(

Advertised Device: Name: , Address: 53:82:42:2c:76:80, manufacturer data: 060001092002c26e567ce60e5aa77c136ea14dd8b4c1c0c631b49fe438
Advertised Device: Name: , Address: 60:3a:7e:4e:b4:9d, manufacturer data: 4c0010051a1c369185, txPower: 12
Advertised Device: Name: , Address: 20:33:77:f2:bf:26, manufacturer data: 59000000000000000000000000000000000064000000b34fc9f8

Thanks!

[joerchan]

@tcpipchip It looks like you have privacy disabled CONFIG_BT_PRIVACY=n and have a non-connectable advertiser.
In this case the advertiser will use a new NRPA address each time it starts to advertise. If this behavior is not wanted you can use
BT_LE_ADV_OPT_USE_IDENTITY to advertise with the identity address.

[tcpipchip]

@joerchan
Thanks for the feedback!

I have other question
sprintf(g_localName,"%s%x","INDRIYA-G-",NRF_FICR->DEVICEADDR[0]);

/* Set Scan Response data */
static struct bt_data sd[] = {
BT_DATA(BT_DATA_NAME_COMPLETE, g_localName, 17),
};

Why sometimes advertsing the INDRIYA-G-XXXXXX and sometimes not adverstising the INDRIYA-G-XXXXXX ?

Thanks again!

[joerchan]

@tcpipchip Not much information to go on there, are you sure it isn't just the difference in the advertising PDU? You have put the name in the scan-response, so you won't see it in the ADV_IND pdu.

[tcpipchip]

@joerchan
I want to broadcast the localname....
What do you suggest

[joerchan]

Putting the localname in the scan-response achieves that, but the scanner needs to be an active one.
The other option is to put it in the advertising data (ADV_IND).

[tcpipchip]

i had choosen the second option! It[s working
Have you a little example showing the scan-response example

[joerchan]

https://docs.zephyrproject.org/2.5.0/reference/bluetooth/gap.html?highlight=adv_start#c.bt_le_adv_start
if you put it as ad in will be in the advertising data ADV_IND, if you put is sd it will be in the scan response data SCAN_RSP.

[tcpipchip]

Yes, i did that

Maybe is the BLE SCANNER (ARDUINO) ESP32 example bug :(

[joerchan]

Maybe, can you verify with your phone that the name shows up? You can use the nRF Connect app

[tcpipchip]

they show!

But, is using ESP32 (Arduino) as ble scan :(

[joerchan]

Closing as original question and follow-up question has been answered.