IOS NFC restartpolling

[denma0513]

Hi

I`m going to develop a app to display image on ePaper by coreNFC ISO15693, but i have only 20sec to transmit data and display image when phone connect on epaper .  

I can use session.repolling() to extend life scycle of NFC session lower iphone13 or below, but else version (iphone15, iphone16) is not working .

As far as I know, i have 60sec to trans data when i to begin a new NFCTagReaderSession, but actullary i have only 20sec. 

If I need more time to transmit, what solution i can do?

Thanks.

[victor laraison]

hi Demna0513,

Currently there are two NFC timeouts we are not able to influence because there is no API.

• A NFC Session has a maximum lifetime of 60 seconds, independent from any card communication.
• When a card was detected the connection will only last for 20 seconds.

Combined there is also something like a worst case:

• The user presents the card 55 seconds after the session was started: The connection will only last for the remaining 5 seconds of the session.

Normally, whatever is iphone model, behavior should be same on every iphone. 
Please, Could you check iOS version used ? 

I tried with iphone15 pro + iOS 17.4, and behavior is as described above.

hope it helps.

br,

[denma0513]

Ｈi

there is following is my test result, use session.restartpolling() to extend the NFC session life scycle.

iphone Xs (IOS 17) : OK 

iphone Xs (IOS 18.0.1) : OK 

iphone 12 pro (IOS 17.4.1) : OK 

iphone 13 (IOS 17) : OK 

iphone 15 (IOS 17) : fail

iphone 15 (IOS 18) : fail

iphone 16 (IOS 18) : fail

[denma0513]

Ｈi

So I have no any soluction to extend the life cycle, if I need over 20 second to done my task?