Where does the peripheral stores the central's address?

[MANGO]

• Custom Board with MCU NordicSemi nRF51822-QFAA

• Softdevice S110 7.1

• IAR for ARM 7.1

• SDK 7.2 using a merged service (HID keyboard example + NUS example + HRS example)

• Testing with iPhone 5S, 6 and iPad air (iOS 8.1.3)

  / Nexus 5 and Galaxy Note 3 (Android 4.4.2).

/******************************************************************************************************************/

For example, my test device iPhone 5S 's address is 80:EA:96:FF:FF:FF.

(Is this address called MAC address? When I sniff with Wireshark, the source's address

appears like this.

Anyway...)

Whereas my peripheral's address is EE:37:83:DD:DD:DD.

Previously on my question "HID Keyboard - Problems After Disconneting and Downloading" ,

when I press "Forget the device", the iPhone erases the bonding info, however,

the peripheral still leaves the phones info in the flash memory.

So I want to check each devices address and if I detect a same address, I want to delete that

bonding info block.

/******************************************************************************************************************/

Back to the question,

where can I check the bonded device's address?

I tried to check these variables, but nothing seems to change except the index.

Where is the central's address?

+) Plus, is that address really called MAC address?

Also, is this address becomes stored into the peripheral's flash?

-Regards, Mango922

[Hung Bui]

Hi Mango,

iOS devices use Resolvable Random Address. Their addresses change every 15 minutes due to privacy concern. The way to recorgnize a previously bonded central is to use the IRK. I guess you can find the value of 16 bytes IRK in the m_peer_table. You can read more about the Resolvable Random Address at section 10.8 Part C Vol 3 in the Bluetooth Core Spec v4.x

[MANGO]

Then..., In short

1 - 1. If I bond with the same device, the IRK is same?

As far as I know, IRK is one of the security keys of Low Energy. Every time when the device bonds with

the peripheral, they use the same key?

1 - 2. Is it possible that different device could have the same irk value?

2 - 1. Is Resolvable Random Address and Random Device Address are same?

I'm looking at Bluetooth Core Spec v4.2. At Vol 3 -> Part C -> section 10.8 ,

the title is Random Device Address.

2 - 2. (The address, which is shown in Wireshark) This address is Random Device Address?

2 - 3. Whenever I sniff with Wireshark the Address of my iPhone doesn't change.

Then this is a Static Random Device Address?