[BLE] BLE MAC always changes when starting BLE advertisement

kai xiong 21

Recently I used a phone to connect GATT service after receiving the BLE advertisement from PC.
When I start BLE adv in PC, the BLE MAC always changes, event ACL is not disconnected.
the BLE MAC should not change when ACL is not disconnected, right?
Is this issue a normal mechnism in Windows? or is there any API to set to keep BLE MAC be same in UWP application when ACL is not disconnected?

Any help will be appreciated~! anonymous user

Thanks!

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,851 Reputation points

2022-05-12T02:47:24.33+00:00

Can share the detail steps to reproduce this problem? and can you tell how to get you mentioned device mac ?
kai xiong 21 Reputation points

2022-05-12T06:20:43.903+00:00
hi,
I used an Android 13(T) phone to test.

start BLE advertisement in PC, and publish a private GATT service

when the Android phone received the advertisement, connect the GATT service

there is an addtional service added in Android 13, MIDI service, it will connect GATT service of PC automatically

when the phone disonnect the private GATT service, MIDI service still hold the service, ACL is still maintained

BLE MAC is changed when PC starts a new advertisement, but the phone side thought current last ACL is not disconnected, the adv MAC should not be changed, only ACL is disonnected, the adv MAC will change.

we check the BLE MAC by the BT log in Android.

is the information enough? if not, I'll provide as you need.

Thanks a lot~
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,851 Reputation points

2022-05-12T06:49:31.66+00:00

Good, can you share the code that used to pubish a private GATT service from pc?
kai xiong 21 Reputation points

2022-05-12T13:42:28.297+00:00

could you plz check this?
kai xiong 21 Reputation points

2022-05-19T03:49:03.137+00:00

hi, could you plz share the progress of this issue?
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,851 Reputation points

2022-05-25T05:26:58.967+00:00

I will discuss with team, can you provide min reproduce sample for us with github link? I will test base on that.