Can an Android NFC phone act as an NFC tag

Question

From what I have understood so far  an NFC phone will act as an NFC reader which will read data from an NFC tag  Now my question is  can we switch this around  Can we make an Android NFC phone behave as the tag which an NFC reader will get data from   Thanks for your assistance

User · Answer

Can we make an Android NFC as the tag which an NFC reader will get data from?

The Nexus S supports peer-to-peer mode, which as its name implies, causes one phone to act as a tag which another phone can read. There was a really good Google I/O session on NFC this year. I would recommended watching it if you're at all interested in NFC.

User · Answer

At this time  I would answer  no  or  with difficulty   but that could change over time as the android NFC API evolves   There are three modes of NFC interaction    Reader-Writer  The phone reads tags and writes to them   It s not emulating a card instead an NFC reader writer device   Hence  you can t emulate a tag in this mode  Peer-to-peer  the phone can read and pass back ndef messages   If the tag reader supports peer-to-peer mode  then the phone could possibly act as a tag   However  I m not sure if android uses its own protocol on top of the LLCP protocol  NFC logical link protocol   which would then prevent most readers from treating the phone as an nfc tag  Card-emulation mode  the phone uses a secure element to emulate a smart card or other contactless device   I am not sure if this is launched yet  but could provide promising   However  using the secure element might require the hardware vendor or some other person to verify your app   give it permissions to access the secure element   It s not as simple as creating a regular NFC android app    More details here  http   www mail-archive com android-developers googlegroups com msg152222 html  A real question would be  why are you trying to emulate a simple old nfc tag   Is there some application I m not thinking of   Usually  you d want to emulate something like a transit card  access key  or credit card which would require a secure element  I think  but not sure

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Its possible to make Android device behave as an NFC Tag  Such a behaviour is called Card Emulation      Card emulation can be host-based HCE  or secure-element based CE     In HCE  an application running on the Android main processor responds to the reader  So  the phone needs to be ON    In CE  an applet residing in the Secure element responds to the reader  Here  its sufficient to have the NFC controller powered  with rest of the device suspended    One of these or both approaches can be active simultaneously  A routing table instructs the NFC controller where route the Reader s commands to

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In the google io session about NFC  qa section  There was such a question      card emulation    No API support for card emulation   No consistent user experience when doing card emulation and no compelling story

User · Answer

yes you can  Android kitkat boosts of this functionality here

User · Answer

Yes  you can Just download this app   Download APP  And if you want to know how do you use this app have a look at this  video How To use NFC tools to emulate NFC as a tag app  Thank You  Please mark my answer if it helps you

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Read here  http   groups google com group android-developers browse thread thread d5fc35a9f16aa467 dec4843abd73d9e9 3Flnk 3Dgst 26q 3Dsecure 2Belement 2Bdiff 2527s 23dec4843abd73d9e9 pli 1  I ve not verified that myself but it looks like people managed to include the hidden code into Android again  They seem to be able to emulate a Mifare Classic card  iso-14443   I ll soon test this myself  it looks very interesting   If you want to do it for a commercial free app you ll have a hard time  your users won t like to change their kernel to support your app   Update  There would be a simple trick to make your phone emulate a ticket  You can get a NFC-sticker and put it in or on the phone  This way you are able to read and write it at all times and other devices can also read and write it  It s just an idea I had  never seen that used anywhere of course

User · Answer

Check the Host-based Card Emulation  HCE  NFC mode available in Android 4 4   API guide  https   developer android com guide topics connectivity nfc hce html

User · Answer

You can definitely make an Android phone write to a tag reader using the NDEFPush functionality in the peer-to-peer support - but you will need to write the code on the tag reader side to use peer-to-peer as well  llcp

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For NFC tech  it is easy  For Google  it will not support it as Google wallet

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If you mean getting a powered NFC device to pretend to be a passive one  eg a tag    not sure how well it works but the android app NFCClassic  purports to record tag contents and then allow the tag to be activated and appear to be the copied tag to NFC readers   Creates a library of recorded tags

User · Answer

No  not at the moment  Google pointed out at the Google IO 2011  that card emulation is not supported and won t be supported for a while  Main  and easy to understand  problem  Which App should get the right on the phone to emulate a smartcard

User · Answer

Yes you can which is Peer-To-Peer Mode  Peer-To-Peer Mode       Bidirectional P2P connection to exchange data between devices      Proximity triggered interactions     Nexus S  Devices have to be placed back-to-back     Example of Applications      Exchange of vCards     Hand-over of Tickets  amp  P2P Payment     Web-page sharing  Youtube-video-sharing     Application sharing

User · Answer

Yes  take a look at NDEF Push in NFCManager - with Android 4 you can now even create the NDEFMessage to push to the active device at the time the interaction takes place

[android] Can an Android NFC phone act as an NFC tag?

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