ndefPollerNdefDetect always returns ERR_PROTO ( 11 )

[AShar.10]

Hi,

My setup is ST25R3911B / RF-HL ported to ESP32.

Recently came across NDEF middleware in "ST25NFC_Embedded_Lib_ST25R3911B". I'm trying to read T2T NFC-A cards but whenever I try to run the NDEF middleware part, the "ndefPollerNdefDetect" function returns error code 11. ( ERR _PROTO )

Here's the flow of my code:

1) rfalNfcGetActiveDevice(&nfcDevice);

If the active device is a T2T card:

2) ndefPollerContextInitialization(&ndefCtx, pNfcDevice); - No error returned

3) ndefPollerNdefDetect(&ndefCtx, &info); - Returns error code 11 ( ERR_PROTO )

What could be the cause of this?

Best Regards,

Ayush Sharma

[Brian TIDAL · Accepted solution]

Hi,

your T2T tag is probably not NDEF formatted and therefore the ndefPollerNdefDetect fails to find the Capability Container. I suggest to check the content of Block #3 (it should start with E1 10 .. ..). You can use ST25 NFC Tap on an Android phone to check the content of the block #3.

Rgds

BT