https://devzone.nordicsemi.com/f/nordic-q-a/44234/bond-with-mitm-and-lescHello I USE SDK15.2 ble_app_gls。 The mobile phone continuously pops up 3 windows to ask whether to pair and a password input window when the mobile phone app is connected to the slave. In my project , the host has no input capability. Host anden-USTelligent Community 13Thu, 28 Feb 2019 17:38:00 GMThttps://devzone.nordicsemi.com/thread/173561?ContentTypeID=1Thu, 28 Feb 2019 17:38:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5d02bbbe-4d8a-4b6a-ac50-781abfb2b5ebKenneth<p>Hi,</p> <p></p> <p>Not sure if I directly understand what you want to know, but if you want to use bonding with man in the middle protection, then you need some kind of user input and output (typically a keyboard or display). How you in practice input and output the data is up to you, it is in theory possible to input and output this over USB, for instance by having an app that control the USB endpoint&nbsp;to read and write without having the user do anything.</p> <p>Best regards,<br />Kenneth</p><div style="clear:both;"></div>