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I have some LoRa nodes (a Dragino LoRa Shield to append an Arduino Uno) and I want to connect them with a Dragino Gateway LG01-P.

I need to take the MAC address (unique address) of my nodes but I don't know how can do that. How can I solve this?

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    This is usually done at protocol level with a unique ID (and often secret) programmed by you into the MCU running your node. Since you haven't given any details of that, this is unanswerable. – Chris Stratton Aug 26 '17 at 17:28

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