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The max connect device number of nRF51 s130 sdk9.0

I run connectivity  of ble_central_and_peripheral example  s130 SDK9.0.

When NRF51 as central device, what the max it can connect with peripheral devices?

When NRF51 as peripheral device, what the max it can connect with central devices?

What the total number NRF51 can connect with other devices?

Is it need to make some change of the SDK?