case BLE_GAP_EVENT_PASSKEY_ACTION:
    } else if (event->passkey.params.action == BLE_SM_IOACT_INPUT || event->passkey.params.action == BLE_SM_IOACT_DISP) {
     ...
    }
}

Add BLE_SM_IOACT_DISP action. This action is necessary when using NimBLEDevice::setSecurityIOCap(BLE_HS_IO_DISPLAY_ONLY).

NimBLERemoteCharacteristic::retrieveDescriptors2() added.

NimBLEServer::handleGapEvent() {
            } else if(event->passkey.params.action == BLE_SM_IOACT_INPUT) {
                NIMBLE_LOGI(LOG_TAG, "BLE_SM_IOACT_INPUT!!!!");
                pServer->m_pServerCallbacks->onPassKeyRequest(peerInfo);
            }
}
added.
This function/action is necessary when using NimBLEDevice::setSecurityIOCap(BLE_HS_IO_KEYBOARD_ONLY).

…haracteristic::getProperties() to NimBLERemoteCharacteristic.h