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scan_adv example - why it is discovered multiple times?

Hello, All

I am trying the scan_adv example, and use my phone to scan the advertising packet, unlike other peripheral examples, I found that it appears multiple time with different MAC address, is this expected? In order to scan it easily, I added a device name and flag in the adv packet.

I use nrf connect SDK and VS code. I use nRF connect Mobile app to do scan.

Thanks you.

Ping

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Amanda Hsieh over 4 years ago in reply to PingISTL +1 verified

Hi, PingISTL said: it is normal for MAC address to be changed like the example above? Since this example advertises with the private address, the address is changed randomly. See If you modify…

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0 Amanda Hsieh over 4 years ago

Hi,

I suggest contacting the Zephyr community through Discord for detailed explanations.

-Amanda
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0 PingISTL over 4 years ago in reply to Amanda Hsieh

Hi, Amanda

Do you mean it might be a Zephyr issue? Is the MAC address of peripheral/advertiser fixed? or changing?

Regards!

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0 Amanda Hsieh over 4 years ago in reply to PingISTL

Hi,

It's the Zephyr's example, so I had directed you there to get the Zephyr's help soon because I would have on vacation soon at that moment.

Today, I read the first post again. Do you mean the mac address is changed each time when it resets? If so, that is expected. If you want the mac address fixed, you could take a look at this post and this post.

-Amanda
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0 PingISTL over 4 years ago in reply to Amanda Hsieh

Thank for your reply, Amanda

Yes, I am talking about advertiser's MAC address.

So, it is normal for MAC address to be changed like the example above? I don't think I have reset it when i see it multiple times with different MAC address.

I am developing a central scan application, and would like to use MAC address as peripheral's ID, if it is keeping changing, then i would have received a lot of them without knowing they are from same device, is this right? how common the MAC address keep changing on fly?

Regards!

Ping
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0 PingISTL over 4 years ago in reply to Amanda Hsieh

Thank for your reply, Amanda

Yes, I am talking about advertiser's MAC address.

So, it is normal for MAC address to be changed like the example above? I don't think I have reset it when i see it multiple times with different MAC address.

I am developing a central scan application, and would like to use MAC address as peripheral's ID, if it is keeping changing, then i would have received a lot of them without knowing they are from same device, is this right? how common the MAC address keep changing on fly?

Regards!

Ping
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+1 Amanda Hsieh over 4 years ago in reply to PingISTL

Hi,

PingISTL said:
it is normal for MAC address to be changed like the example above?

Since this example advertises with the private address, the address is changed randomly. See

If you modify to BT_LE_ADV_NCONN_IDENTITY at https://github.com/nrfconnect/sdk-zephyr/blob/main/samples/bluetooth/scan_adv/src/main.c#L60, it would get fixed advertising address.

-Amanda
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0 PingISTL over 4 years ago in reply to Amanda Hsieh

Thank you, Amanda

It explains my confusion.

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