How to manage sleep mode with the framework ST X-CUBE-CELLULAR ?

[IOT Embedded System]

I would like to manage the sleep mode of the BG96 Modem with the ST X-CUBE-CELLULAR5.2 , but I did not arrive, can you please help me with ideas

IAR Workbench

Kit : P-L496G-CELL02 ( STM32L496 + Modem BG96 )

ST X-CUBE-CELLULAR5.2 

Manage sleep and wakeup mode with the framework ST X-CUBE-

Can You help me Please !