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  • but how do I get this data ?

    What data? The number like 0x180f? Check out the link to the Bluetooth SIG in http://www.espruino.com/About+Bluetooth+­LE#uuids

    why is it? can I change the MAC of the device ?

    Each device has its own MAC address - that's how it works, like Ethernet/WiFi/etc.

    You can change it with NRF.setAddress but it's not recommended.

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