Nimble Pairing method on two esp32

[suadss]

Hi I'm trying to implement the pairing process (passkey method) using Nimble Ble stack on two esp32. One device will initiate the pairing process(ble_gap_security_initiate) the other device needs to send the pin (pin is hard coded).
So I used the bleprph example with minor changes, and using my phone everything is working fine! When trying to connect I need to set the pin code, one side is working.

But I need this part on a second esp32 I used the blecent example for the second device, when the ble_gap_security_initiate function is called from the first device shouldn't be there a GAP EVENT on the second device?
Can someone explain how this process is working?