BC68 and BG96 PSM mode settings

PSM mode for all NBIOT modem well known for its power consumption. we would like to know how to set PSM mode for both BC68 and BG96 from external MCU. Idea is to keep the modem pre-registered on the network.
And how modem can be waked up from server and interrupt MCU for data request.

MCU configuration PSM timer has AT instruction set, but only if SIM card APN supports module configuration, core network will allow configuration.

The server wake up module can only be turned off in PSM mode and only in connect and idle mode.

BC68 can send uplink data through MCU or T3412 timer timeout wake up module.

BG96 can only wake up modules via external hardware pins or T3412 timers.