Android Question Own Bluetooth Mac Address

[Mark Ryan Penafiel]

In the Bluetooth admin example there is code you scan available Bluetooth and Connect to Mac address

Public Sub ConnectTo (Device As NameAndMac)
    serial.Connect(Device.Mac)
End Sub

is the Device.Mac, the mac address of bluetooth or the phone? is this unique? and how can i know the my own device mac address

Thank you

 

[KZero]

it's unique in all Android versions except android 10+

MAC address randomization
On devices that run Android 10 or higher, the system transmits randomized MAC addresses by default.

Privacy changes in Android 10 | Android Developers

developer.android.com

 

[Mark Ryan Penafiel]

What happens if you pair a bluetooth device? you save the randomized MAC address? on Android 10 above?

 

[KZero]

What happens if you pair a bluetooth device? you save the randomized MAC address? on Android 10 above?

the other device will always see the same MAC address used in the first pairing,
but if you connected to another device, this new device will see another MAC address.

 

[Mark Ryan Penafiel]

I need a unique identifier via bluetooth with pairing, want to build similar to this

TraceTogether

Help stop the spread of COVID-19 through community-driven contact tracing in Singapore.

www.tracetogether.gov.sg

can you suggest some identifier i can use

 

[Erel]

A random GUID?
Advertiser id? https://www.b4x.com/search?query=Advertisingid

 

[Mark Ryan Penafiel]

I will create an app will log a unique ID per phone via bluetooth. Im thinking of using MAC address provided by bluetooth manager. but as mentioned, it is changes. What else i can use, without internet and via just using bluetooth similar to the covid19 contact tracing app in singapore.