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There is no real specification. This is the best source[1], which documents QR standards.

>There are some standards -- de facto and otherwise -- already in use. This wiki attempts to catalog some possible standards for encoding various types of information, and suggest a standard action associated to them.

[1]: https://github.com/zxing/zxing/wiki/Barcode-Contents#wi-fi-n...

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Damn, that's saddening, but also answers a question I had about what the escape character is for a password containing `;` -- I guess there's no specification to tell me :-(

OTOH, I guess a "standard" is whatever the common implementations accept anyway, so if one could dig up the source to the WiFi QR scanner in source.android.com that's the 2nd best thing

No specification, but the linked website mentions that they “propose a syntax like "MECARD" for specifying wi-fi configuration” and then later:

> Special characters \, ;, ,, " and : should be escaped with a backslash (\) as in MECARD encoding.

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