cc2640: switch role from peripheral to cental

Part Number: cc2640

Dear TI's Engineer team,

I'm developing a embedded tracking device on cc2640, and I need to switch the role of the device from peripheral to central in order to the device can ring a phone.

My coworker engineer asked this question last year in this link:

But the TI's engineer JXS indication of Simplelink Academy doesn't mean anything.
Also he refers the button service in ProjectZero, but I've analyzed the ProjectZero several months, and I know it very well. The button service is just using a notification, not the change role from peripheral to Central.
We specifically need to know how to change roles from peripheral to central. 
Since Nordic semiconductor's ble-sdk can do it easily, Ti also can do it. 
Any help will be appreciated.
Thanks in advance!


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