Why the default MAC address is not shown in the host when using hciconfig command in linux #hci #ble #nrf52 #nrf52840

Venkatesh Dyagala

We are willing to do the LE USB controller with the nrf52840 dongle
By looking into this case https://devzone.nordicsemi.com/f/nordic-q-a/46036/mac-address-ranges. I came to know that there will be random address loaded into the device in production of nrf52840 Dongle.
Then Make that as a controller followed this https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/nrf5x-support-within-the-zephyr-project-rtos and  https://docs.zephyrproject.org/latest/getting_started/index.html to compile and build an hex file. The respective build is done for the hci_usb.
The build is done and loaded to the dongle using nrfutil.
Now when we insert into linux PC and when i check the device using the hciconfig command the MAC address of the dongle is 00:00:00:00:00:00
But when we used bluetoothctl show command a 6byte MAC address is shown.
I can change the MAC address manually using hcitool commands. But my question is that
1-->The nordic assigned MAC address in production for every device. Why that MAC address cannot be seen when the dongle is acting as a controller. Why its showing all zeros ?
2--> The bluetoothctl is showing the MAC address of the device But it cannot be updated in the hciconfig ?
3--> If we have a MAC how we can burn it into the flash what was the memory locations ?
4--> The MAC that we seen using bluetoothctl show is zepher hardcoded ?



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