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monkeyboard / Wiegand-Protocol-Library-for-Arduino

Wiegand 26 and Wiegand 34 Protocol Library for Arduino
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UIDs not available for GlobalPlatform based Secure Elements that don't include Mifare #40

Closed JohnMcLear closed 5 years ago

JohnMcLear commented 5 years ago

https://github.com/esprfid/esp-rfid/issues/292

Includes proposed fix.

jpliew commented 5 years ago

Hey @JohnMcLear I think there is a misunderstanding somewhere.

This library reads wiegand data, it has no control over how to read a card, how to read different types of card.

The card reader that has wiegand output reads the card, interpret the data of the card, and send out the data it deemed correct to wiegand output, this library reads the wiegand output and display the content of the wiegand output.

Cheers JP

JohnMcLear commented 5 years ago

@jpliew Oh. So the wiegand device is the limitation, very interesting and this would explain why certain readers read different values from the same card. Wow, what a fucked up situation to be in!

So TLDR; if you use Wiegand, you can't be consistent w/ UIDs if you use different makes/models of readers because the Wiegand logic implemented changes between devices (Despite being a standardized protocol [citation needed])

jpliew commented 5 years ago

@JohnMcLear, Wiegand is a standard protocol but how the content is encoded in this standard is depending on the device.

Just like TCPIP is a standard, but how application send the content (http,smtp,ping, etc) is depending on the application.