Now that’s freedom.
What os is the ap running?
What’s wrong with NULL? How else can you differentiate between not having a value and having a blank value?
The moral of the story is don’t let strangers access your admin interfaces.
NFC sticker would have a coil of wire as the antenna around a little bump in the middle which is the chip. https://www.google.com/search?tbm=isch&q=nfc+sticker
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