Bluetooth radio frequency

Is it possible to read the frequency the nRF52840 is using to advertise bluetooth on?

BT (including BLE) is defined to be using the 2.4GHz band (same as WiFi) - and since BT uses channel hopping you cannot say definitively which exact frequency it will use at any given time.

Maybe you could elaborate why you want to know the frequency - the protocol should not require you to know that, so what would be the benefit?

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