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LESC Confusion

I am trying to perform LESC on two nRF52 central and peripheral without bonding is it possible? and how?

My devices does not have I/O capabilities or have any display.

How can I enable MITM if there are not I/O?

on: infocenter.nordicsemi.com/index.jsp

I could not find a Security parameters with:

sec_param.bond = false;
sec_param.mitm = true;
sec_param.lesc = true;
sec_param.keypress = 0;
sec_param.io_caps = BLE_GAP_IO_CAPS_NONE;
sec_param.oob = false;

and BLE_GAP_CONN_SEC_MODE_SET_LESC_ENC_WITH_MITM

The setup above is possible?

Regards, Mufasa

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