Thanks sonnyyu for the answer and the tips, but I already have all the hardware I need.
I need to solve the issue of having Yun and my NFC shields communicating together.
And besides, my problem at the moment is that Yun DOES NOT PRINT ANYTHING ON THE SERIAL!!!!!
I can't understand why!!! Is this a normal behavior or not? Should I return the board?
Is it defective??
NFC Forum Type 2 Mifare Ultralight, Mifare Ultralight C
NFC Forum Type 3 Sony FeliCa
NFC Forum Type 4 Mifare Desfire (ev1/ev2), NXP SmartMX with JCOP
Mifare Classic is not an NFC Forum compatible card. It requires NXP's Crypto 1 support that is
only available in NXP reader ICs and crypto keys that are not published in NFC Forum specifications.
NXP SmartMX with JCOP are widely use at ePassport. The ePassport is the next generation of travel documents and has many advantages: It reduces the risk of tampering and identity fraud by adding more layers of identity checks, all of which must match.
You need faster CPU to mange it (Yun is fine.), Arduino would not go far.