https://devzone.nordicsemi.com/f/nordic-q-a/49674/le-secure-connections-when-there-is-no-io-capabilityI want to realize &quot;LE Security Mode 1: Level 4&quot;. However, there is no IO capability in both devices. I tried the following. 1) Set the IO capability of both devices to &quot;BLE_GAP_IO_CAPS_DISPLAY_YESNO&quot;. 2) With this setting, the authentication operationen-USTelligent Community 13Thu, 25 Jul 2019 03:36:19 GMThttps://devzone.nordicsemi.com/thread/200383?ContentTypeID=1Thu, 25 Jul 2019 03:36:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6475a456-a2e1-4a5f-981e-037d3a77aac2takashina hiroki<p>Thank you for answering.<br />I understood that.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/198279?ContentTypeID=1Sun, 14 Jul 2019 15:47:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5e6ce23a-0875-4bfc-bb47-acace66cbbdaKenneth<p>Hi,</p> <p>Please check out:</p> <p><a href="https://www.digikey.com/eewiki/display/Wireless/A+Basic+Introduction+to+BLE+Security#ABasicIntroductiontoBLESecurity-PairingMethodsforLESecureConnections(4.2devicesonly):">https://www.digikey.com/eewiki/display/Wireless/A+Basic+Introduction+to+BLE+Security#ABasicIntroductiontoBLESecurity-PairingMethodsforLESecureConnections(4.2devicesonly):</a></p> <p>Also, since you are in specific asking about Numeric Comparison:</p> <p><a href="https://www.bluetooth.com/blog/bluetooth-pairing-part-4/">https://www.bluetooth.com/blog/bluetooth-pairing-part-4/</a></p> <p>This may also be useful for an overview:</p> <p><a href="https://stackoverflow.com/questions/38963836/bluetooth-low-energy-gatt-security-levels">https://stackoverflow.com/questions/38963836/bluetooth-low-energy-gatt-security-levels</a>&nbsp;</p> <p>Best&nbsp;regards,</p> <p>Kenneth</p><div style="clear:both;"></div>