Possibility for PN532 Shield to detect another reader

[dvdl]

Hi

Firstly thanks for a great product, I'm having bucket loads of fun with NFC tags.

After some research I found that the possibility for NFC p2p capability is still under development, for example p2p between the shield and an Android NFC-enabled smartphone communicating via the initiator-target-protocol.
The other method for an NFC shield to "communicate" with an Android smartphone requires the Smartphone to emulate a Passive NFC tag (ensuring a static UID), but this is impossible due to limited releases of Google API's.

What I'd like to know is how can the shield detect the proximity of another NFC antenna/reader (ie. in a smartphone), not necessarily establish a p2p comm with it nor try to identify the UID or RID, but just detect that it is present?

Looking forward for your reply!

[ktownsend]

I don't have an aswer to this off the top of my head, so you'd really have to dig into the datasheets yourself. Anything peer to peer gets complicated, though, since you need to have a good picture already of how everything fits together, etc.