Hello, I don't know exactly how the BD_ADDR works, but you might try generate a hash (maybe SHA256? [1]) from CPU ID (function cpuid_get [2]).
Then you can truncate to 48 bits and manually set/fix required bytes. Of course the truncation makes the hash weaker in terms of the chances of having 2 same BD_ADDR, but I think that's very unlikely. Best regards. [1] http://riot-os.org/api/sha256_8h.html [2] http://riot-os.org/api/group__drivers__periph__cpuid.html#ga562e64bc300b062ac82dac98b8af7cf2
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