How to switch between Low power modes of a BLUENRG2-M2 BLE module ?

[ASOus.1]

I am using BLUENRG-M2 module as a Network Processor (Controller) and an STM32L4 MCU as a host.

I want to make the device connectable via Bluetooth during a limited time (e.g 30 seconds) then put the Controller to SLEEP mode (e.g 30 seconds) to save energy. I was looking in the HCI documentation and I couldn't find any command that allow controlling power modes of the controller from the host.

My questions are :

1- How can I change power mode of the controller to sleep mode using HCI or ACI interfaces ?

2- Is there an other way to save energy for my use case (e.g 30 sec connectable + 30 sec in SLEEP MODE)?

Thanks.

[reokyouma]

have you solved this?