Is possible get CONNECT_REQ event on SDK 15.2

Dear Nordic,

      We are using  NRF52832 + RFX2411N for our product, and for lower the power consumption. we wonder if there has any way to know the CONNECT_REQ event.

In advertising state, PA chip will be bypassed, when received CONNECT_REQ packet from a central device, then it turn on PA chip.

     From SDK 15.2, the  BLE_GAP_EVT_CONNECTED is too late to turn PA chip on, but  I can't find relate event about CONNECT_REQ packet.

      Please give us some suggestion, thanks! 

      SDK : nRF5_SDK_15.2.0_9412b96