I found it great to integrate ZigBee devices without using a gateway like conbee or others.
The raspberry has internal bluetooth available so it would be possible to use this one instead of any usb device or hat for that.
ZigBee requires a specific chip to communicate, Bluetooth or wifi chips would not be able to handle it.
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The concept of ZigBee communication requires a Coordinator (aka gateway).
So without Coordinator no ZigBee network.
The Bluetooth can only be used for the Bluetooth integration.
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