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Problem to disable ble secure

Other Parts Discussed in Thread: CC2652RB


I am using TI's LaunchPad (Ver. CC2652RB) and I would like to disable the LE secure connection and activate LE legacy pairing.

But unfortunately I am not able to implement this feature. In the configuration file of simple_central, I can only choose between [Supported,Secure only](see image 1), but in gapbondmrg.h I found the definition of unsupported secure connection(see image 2), and when I call the function GAPBondMgr_SetParameter(see image 3) to set the parameter of GAPBOND_ SECURE_CONNECTION parameter, the return value is 0x18, i.e. out of range(see image 4).

So, is it possible to close the secure connection? 

Best Regards,






  • Hi Yabo,

    Bluetooth 5.x certified devices (such as the CC2652RB) are not allowed to support LE legacy pairing only / "GAPBOND_ SECURE_CONNECTION_NONE".

    Actually, Bluetooth 5.x certified devices are allowed to use LE legacy pairing only when interfacing with a 4.x device supporting only this mode.  

    In summary, the behavior observed is expected and cannot be changed without breaking the Bluetooth specifications.

    I hope this will help,

    Best regards,