send
Sends an Application Protocol Data Unit (APDU) command to the contactless card and retrieves the response.
This function facilitates communication with a contactless card by transmitting a specific APDU command and awaiting the card's reply. APDUs are the standard format for exchanging data with smart cards.
Return
A String containing the response APDU from the card. This response usually includes a status word (SW1, SW2) indicating the outcome of the command, and potentially data returned by the card.
Parameters
A ByteArray representing the APDU command to be sent to the card. This typically includes a class byte (CLA), instruction byte (INS), parameter bytes (P1, P2), and optionally a data field length (Lc) and data field, and an expected response length (Le).
Throws
If an error occurs during the communication with the card, such as a communication failure, card removal, or an invalid APDU command. The specific error details can be found within the NexusException object.