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Device manager: How to identify between already bonded phones with new phones?

Hi, I am developing a firmware using nrf51822xxaa s130 SDK 10.0. I am using device manager to exchange the security keys and storing the bond information. For my project, I need the firmware to connect to the phone that is already paired with the device (before power cycle of the device). In other words, I should be able to identify if the app has already bonded with me before or not. Also, I need to identify if this is the first time the app is bonding with me. [I remember I saw an event which would occur only the very first time when a device and app would bond and that event would not occur in the subsequent connects (because it is already bonded before). I cant remember which event is that.] The project is in its final stages and at this stage we cannot afford to make a transition to SDK 11.0 or later versions: please consider this. Please help. Thanks.

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