Applet triggering via SMS

Question

Hello,
I am developing an STK applet that is triggered on an event (EVENT_UNFORMATTED_SMS_PP_ENV) of a directly send SMS to the SIM (SIM Data Download). The message in the "UserData" of the SMS contains some commands to test proactive commands of the ME.
Now, I am thinking of receiving an SMS with "APDU-Commands" in the "processToolkit (byte event)" method, extracting and formatting the "UserData" with the "APDU" and calling the "process (APDU apdu)" method. Is this possible?
The reason of doing so is to be a little independent of the SIM API.
Thanks in advance...

Answer 1

Hello AnuViji,
As far as I know is there no possibility to send APDUs direcelty to the SIM.
"The difference between a Java Card applet and a Toolkit applet is that the latter does not handle APDUs directly. It will handle higher level messages." (3GPP TS 43.019)
To extraxt the TP-UD from an unformatted SMS you can use this sample code:
private void unformattedSmsDownloadService () {
// TP-UDL byte offset
short tp_UDLOffset;
// Get the references of the required SIM Toolkit session handlers
EnvelopeHandler envHdlr = EnvelopeHandler.getTheHandler();
ProactiveHandler proHdlr = ProactiveHandler.getTheHandler();
// Clear the temporary data buffer
Util.arrayFillNonAtomic(tempBuffer_A, (short)0, (short)tempBuffer_A.length, (byte)0x00);
// Get TP-UDL byte offset
tp_UDLOffset = envHdlr.getTPUDLOffset();
// Store TP-UDL byte value in tempBuffer_A[0]
tempBuffer_A[0] = envHdlr.getValueByte(tp_UDLOffset);
// Copy TP-UD (located at TP-UDL+1) in tempBuffer_A after length byte
envHdlr.copyValue((short)(tp_UDLOffset + 1), tempBuffer_A, (short)1, tempBuffer_A[0]);
// Display the data recieved
proHdlr.initDisplayText((byte)0, DCS_8_BIT_DATA, tempBuffer_A, (short)1, (short)tempBuffer_A[0]);
proHdlr.send();
return;
Regards,
Daniel