Clever Geek Handbook

How to fix uid in NFC

I want to fix the uid for nexus s and use the phone to mark on the NFC screen. The shield will show the ID. But when it flows to the nfc screen, the id doesn't match. Can I correct my uid?

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Most likely it is NFCID: NFC peer-to-peer identifier. This ID is randomly generated anew by the NFC equipment on every NFC connection and cannot be corrected.



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The current SDK does not allow card emulation, so you cannot use the phone as a tag.



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Since the ID changes peer-to-peer for each connection, you will need to define an NDEF entry with a text value. Make this a fixed ID. On the other hand, on the shield, you will need to read this entry to find the fixed value / ID.

https://github.com/adafruit/Adafruit_NFCShield_I2C/tree/master/examples contains some examples of how to manage NDEF records, but only on the classic MiFare. If you are using Ultralights or other tags, this will be different.

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