How to Resolve Contactless Detection Priority Over Chip in POS Systems: Difference between revisions
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Revision as of 16:08, 16 January 2024
Issue
In some instances, POS systems detect a contactless card before a chip card, even when attempting to process a chip transaction. To resolve this, follow the steps below:
Step-by-Step Solution
- Enable Anti-Shake Function:
- Before opening the reader, execute 'emv_set_anti_shake(1)' to enable the anti-shake function.
- Example: This can be done in the 'readAllCard' method in 'FuncActivity.java'.
- Handle Contactless Card Found Event:
- When a contactless card is detected, the 'SMART_CARD_EVENT_CONTALESS_ANTI_SHAKE' event will be triggered.
- The callback function will wait for 400 ms by default to allow for detection of other readers.
- Implementation: This can be observed in 'cardEventOccured' in 'FuncActivity.java'.
- Check MSR Read in Callback:
- In the card event callback, specifically 'case CARD_CONTACTLESS_ANTISHAKE:' in 'RequestCardActivity.java', check if MSR is read.
- Call 'emv_anti_shake_finish' based on the MSR state. This method should also be called if a contact card is found ('case CARD_INSERT_NOTIFIER:' in 'RequestCardActivity.java').
- Restart Contactless Reader if Necessary:
- If there’s an interaction error with the contactless card ('case ERROR_PROCESS_CMD:' in 'ProcessEMVCardActivity.java'), restart the contactless reader.
- Consider steps 1 and 2 if contactless is restarted ('case CARD_CONTACTLESS_ANTISHAKE:' in 'ProcessEMVCardActivity.java').
- Interrupt Contactless Transaction for Contact Card Insertion:
- During a contactless transaction, if a contact card is inserted, interrupt the transaction before reading the application finishes. Then, restart the transaction with the contact card.
- See 'case ERROR_CONTACT_DURING_CONTACTLESS:' in 'ProcessEMVCardActivity.java' for implementation details.
Note:
- These steps encompass the entire procedure for handling the issue of contactless detection taking priority over chip detection.
- For further guidance and example implementations, refer to the EMVSample documentation.