Matter + BLE custom service

[SubuMuthu]

It is nRF54L15 + SDK 3.0 + Matter application. 

I have developed a custom BLE service that is based on  Nordic's proprietary NUS BLE service.  The BLE custom service is enabled at start up, connects to a BLE App  for configuration and after that the App tells the product to join the matter network. 

I have looked at the NUS services from door lock example.

1. When the button is pressed in DK, ButtonEventHandler in  sdk/nrf/samples/matter/common/src/board/board.cpp calls StartBLEAdvertisementHandler(action) (line 225).

2. StartLEAdvertisement calls  StartBLEAdvertisement()

Based on the above, in my application, 

1. At startup,  Nrf::Matter::PrepareServer()) is called. The BLE service (is identical to NUS) is called. It uses the below to start the BLE service.

PlatformMgr().LockChipStack();
CHIP_ERROR ret = BLEAdvertisingArbiter::InsertRequest(mAdvertisingRequest);
PlatformMgr().UnlockChipStack();

2. The BLE app connects for configuration.

3. The BLE App asks Matter application to start the Matter server.   Nrf::Matter::StartServer() is called.

4. After completion, stop the BLE server

PlatformMgr().LockChipStack();
BLEAdvertisingArbiter::CancelRequest(mAdvertisingRequest);
PlatformMgr().UnlockChipStack();

5. Disconnect the BLE App. Then start  Nrf::Board::StartBLEAdvertisement();

The CHIP BLE service fails. see below error.

I: 11008675 [DIS]Updating services using commissioning mode 1
E: 11008681 [DIS]Failed to remove advertised services: 3
I: 11008687 [DIS]Advertise commission parameter vendorID=65521 productID=32774 discriminator=3840/15 cm=1 cp=0
E: 11008698 [DIS]Failed to advertise commissionable node: 3
E: 11008704 [DIS]Failed to finalize service update: 3

[2418774876] MTI BLE Advertising stopped 
I: 11008714 [DL]Advertising start failed, will retry once connection is released
E: 11008722 [DL]Failed to start CHIPoBLE advertising: -12
I: 11008727 [DL]CHIPoBLE advertising already stopped
E: 11008733 [DL]Could not start CHIPoBLE service due to error: 200000c

Observation:

Although Step #4 stops the custom BLE service, the customer BLE service is restarted automatically and the advertisement begins. I tried to stop the custom adv after step 4 and before step #5 but  without any success.

However,  matter commissioning works, if  BLE App is not connected. For clarity, 

1. Step #1 is the same as above - At startup,  Nrf::Matter::PrepareServer()) is called.

2. Then BLE custom service is initialized.  BLE custom service is advertised. App is not connected.

3. Start Matter server - Nrf::Matter::StartServer() is called.

4. Stop the BLE server.

5. Then start  Nrf::Board::StartBLEAdvertisement();

Please let me know.

Thanks

Subu