Is there a way to increase timeout for 'NFCMifareTag.SendMiFareCommand()'?

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zeuschyant88-7033 asked Nov 2, '21 WenyanZhang-MSFT commented Nov 23, '21

Is there a way to increase timeout for 'NFCMifareTag.SendMiFareCommand()'?

I'm working on an NFC app for R&W operations on an NFC tag.

All R&W operations work fine with the 'SendMiFareCommand()' API, however there's a special command for 'password authentication' process where it fails with a timeout, may be because the NFC tag is not responding in time.

This issue is not observed every time, so I'm sure about the command I'm sending and how its response is to be processed. Moreover, this issue appears more frequently on iPhone 12 & 13 than older ones, may be because they changed something at the NFC lower layer.

Anyway, Android allows adjusting timeout which is usually done before sending any command, so that it gets enough time to respond and the session remains active. It's typically done as - mifareTag.Timeout = timeout_value_ms;

Can this be done for iOS? I could not find much in their API documentation.

dotnet-xamarinforms dotnet-ios

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WenyanZhang-MSFT · Nov 23 at 08:26 AM

May I know if you have got any chance to check my answer? I am glad to help if you have any other questions.

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Answer 1 · 2021-11-03T07:13:55.733Z

WenyanZhang-MSFT answered Nov 3, '21 WenyanZhang-MSFT edited Nov 4, '21

Hello,

Welcome to our Microsoft Q&A platform!

I have to say that Apple doesn't provide an API to set the session timeout. Tag scans must be user-initiated, and time-out after 60 seconds. It dependents on the iOS feature, you could report a new feature request to Apple Developer Forums.
There is a NFCReaderSessionInvalidationErrorSessionTimeout error, I think you need to handle this error and prompt to send commands again.

Best Regards,
Wenyan Zhang

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