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About BLE_GAP_EVT_SEC_PARAMS_REQUEST and BLE_EVT_SEC_INFO_REQUEST

When I was using the device as peripheral, I was wondering when the Softdevice notified BLE_GAP_EVT_SEC_PARAMS_REQUEST and BLE_EVT_SEC_INFO_REQUEST:

1, when peripheral send security request, I will receive BLE_GAP_EVT_SEC_PARAMS_REQUEST?

2, when the central send pairing request, I will receive BLE_GAP_EVT_SEC_PARAMS_REQUEST?

3, there are other I did not expect the situation, will receive BLE_GAP_EVT_SEC_PARAMS_REQUEST it?

4, softdevice under what circumstances to send BLE_EVT_SEC_INFO_REQUEST?

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