Maximum request/response size with Iso14443Connection.exchangeData?

[hvuoltee]

Hi,

I'm working on a project that tries to use Nokia 6131NFC with a custom ISO14443 'smart card'. We've managed to get communication working between the phone and smart card, but there seems to be somekind of limit to request and response sizes. Especially for responses the limit seems to be low, around 180 bytes. When going over this, the phone generates the following error: "Com error 0x0f".

Any ideas? Is it possible to use longer responses? Is this a known issue?

-H-

[raphaelspreitzer]

Hi,

I just found out that the exact length of maximum response bytes is 253. Up until now I could not figure out what causes this limit.

A possible workaround to use longer responses: Limit the length of transmitted data from the applet (smart card) to 253 bytes and use the GET RESPONSE
command to retrieve all parts until you receive statusword 9000.

Raphael

[npr.novo]

I have also seen the 253 bytes limit for ISO14443A-4. You need to limit your "Read Binary" to ~250 bytes and then execute multiple "Read Binary" until you have the amount of bytes you want from the smart card.

There are also different limits for NDEF records depending on if you are using a 6131 or a 6212 and if you are using auto launch or manuel start of an application. See this post:
http://discussion.forum.nokia.com/fo...ghlight=buffer

[traud]

I just found out that the exact length of maximum response bytes is 253.

Same here, see me list of max size for the response bytes in R-APDU (max Le) (without the two status words SW1-SW2):

0x03e Nokia Symbian
		Nokia 808 PureView Firmware 113.010 aka Belle Feature Pack 2
		java.io.Exception:  Exchange Data failed, Error Code: -9
		-9 = KErrOverflow: buffer has over-filled without being emptied soon enough.
0x0fd Nokia Series 40
		Nokia 6212 classic Firmware 06.20
		java.io.IOException: Communication error (0x0f)
		hangs complete NFC stack
0x105 Samsung Handset Platform
		Samsung S5230N Firmware JF3
		java.io.IOException: some other kind of I/O error occurs
		hangs complete NFC stack
0x0f7 Samsung bada 2
		Samsung S5380 aka Wave Y Firmware KK4
		java.io.InterruptedIOException: The connection to the smart card was lost
		java.lang.Runtime: Unknown result of the exchange procedure
		hangs complete NFC stack

A possible workaround: Limit the length of transmitted data from the applet (smart card) to 253 bytes and use GET RESPONSE to retrieve all parts until you receive status word 9000.

My target does not support the instruction GET RESPONSE nor does it listen to Le.

@All: Does anyone have an idea?