https://devzone.nordicsemi.com/f/nordic-q-a/42867/maximum-passkey-lengthAs per my requirement, I need strong pairing mechanism, i am referring ble_app_gls example of nRF5_SDK_15.2.0_9412b96 sdk for checking pairing. As i have seen in the code, only 6 bytes passkey are used. Can we increase the Passkey Length? If yes, howen-USTelligent Community 13Wed, 23 Jan 2019 09:52:25 GMThttps://devzone.nordicsemi.com/thread/167308?ContentTypeID=1Wed, 23 Jan 2019 09:52:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c5086013-034d-4ca6-8f15-138527936e79Vidar Berg<p>Hi,&nbsp;</p> <p>The passkey must be 6 digits (0-9) according to the Bluetooth specification.&nbsp;You can read more about the Pairing methods in Bluetooth core specification v.5, vol. 3, part H, section 2.3.&nbsp; I don&#39;t think it&#39;s feasible to perform a MITM attack if you use LE secure connections pairing (LESC).&nbsp;</p><div style="clear:both;"></div>