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Frequency hoping sequence - is it really random?

In my application many nodes (acting as centrals) will start simultaneously, as they have common power supply. I am using s132 SoftDevice (4.0). Is the frequency hoping sequence initalized with true random value (how? when?), or is it fixed to some predetermined value (what?). I would like to avoid situation, where all my central devices have the same frequency hoping pattern. Do I have to use some specific API function to set frequency hoping start frequency? Do I have any control over the frequency hoping seqnence?