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802.15.4 device extended address

Hello,

I changed the 802_15_4/wireless_uart example to use MAC_ADDR_LONG. I am setting the extended address to (NRF_FICR->DEVICEADDR[0] | ((uint64_t)NRF_FICR->DEVICEADDR[1])<<32) but as I read this is just a random number. Is this compliant with IEEE802.15.4 specification or is there an other register we can use to create a EUI-64, as defined in IEEE Std 802?

Thanks

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