BLE mesh message confirmation

Hi,

I have to transfer messages every 100ms and to receive confirmation about successfull reception.

Message is sent from the phone and should make two hoos and return back a confirmation.

I am testing with original examples in sdk v15 but problem is that confirmation is comming after 1-3 seconds. What could be a reason for this? Or du you have an examole that could work the way i wrote.

Thanks

Julius