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BLE Cert Link Key Creation

Hi,

I'm working on getting our product through BLE certification and they are asking a few quesion's that I'm not sure about.

1: Pairing. Is it using a fixed PIN or variable PIN? I assume since I am using the Just Works method it is using the fixed key of 000000. Is this a correct assumption?

2: Link Key. Is the creation of the link key done using the Unit Key? Or a Combination Key?

I am using the nrf51822 with Softdevice s110 v 7.0