Starting and Stopping a Timer in Java Card + GSM

Question

Hi,
I seem to not be able to start a timer that my applet has
allocated using the PRO_CMD_TIMER_MANAGEMENT
pro active command. I want to for example set the timer
interval to 5 seconds and I understand from the gsm
specs that the TLV value should then be {(byte) 0x00,
(byte) 0x00, (byte) 0x05} as the hour is zero, the minute is
zero and the seconds = 5 .
The command qualifier I set to 0x00 to start the timer and
I set it to 0x02 to stop the timer. The start and stop I
control from two menu items. From the GSM spec the first 2 bits
control the timer and the remaining 6 are RFU (reserved for future use),
now I assume I can then set the RFU bits to 0.
I then have a EVENT_TIMER_EXPIRED in my processToolkit which then plays a tone.
The tone proactive command works but I dont seem to be able to start the time or
stop it ?
HELP ?
is there any suggestions or any error in my reasoning here ?

Answer 1

I tried your solution but it seems to have no effect (?)
This is the log entry of the comms during sneding of the timer start
command:
(Notice that where you have the Timer Identifier tag = A4, here it is
24 and where you have Timer Value Tag = A5, here it is 25 - these tags and the APDU's are generated with the GSM java card libs in the development kit I'm using.....) It seems to go through but the TIMER_EVENT_EXPIRED never happens....Help ? Have a look at the source code I included (maybe I'm doing something wrong)....
**THE APDU's
//346:
A0 12 00 00 13
//Fetch
//     RAPDU = D0 11 81 03 01 27 00 82 02 81 82 24 01 01 25 03 00 00 10
//     SW = 9000
//347:
A0 14 00 00 0C 81 03 01 27 00 02 02 82 81 03 01 31
//>>Terminal response
//     SW = 9142
**SOURCE CODE
//IN A METHOD CALLED FROM A MENU ITEM SELECTED
byte[] valCurrentCallUnit = {
(byte)0x00, (byte)0x00, (byte)0x10
}; //i.e. 1 second
timerHandle = reg.allocateTimer();
proHdlr.init(PRO_CMD_TIMER_MANAGEMENT,(byte)0x00,DEV_ID_ME);
proHdlr.appendTLV((byte) TAG_TIMER_IDENTIFIER,timerHandle);
proHdlr.appendTLV((byte) TAG_TIMER_VALUE,valCurrentCallUnit,
(short) 0, (short) 3);
result = proHdlr.send();
//the following is not suppose to be required according to GSM 11.14
reg.setEvent(EVENT_TIMER_EXPIRATION);
//IN THE processToolkit method, I have:
public void processToolkit(byte event) {
     EnvelopeHandler envHdlr = EnvelopeHandler.getTheHandler();
     ProactiveHandler proHdlr = ProactiveHandler.getTheHandler();
     ProactiveResponseHandler rspHdlr;
switch(event) {
case EVENT_TIMER_EXPIRATION:
doSomething();
proHdlr.init(PRO_CMD_TIMER_MANAGEMENT,
(byte)0x00,DEV_ID_ME);
proHdlr.appendTLV((byte) TAG_TIMER_IDENTIFIER,timerHandle);
proHdlr.appendTLV((byte) TAG_TIMER_VALUE,valCurrentCallUnit,
(short) 0, (short) 3);
result = proHdlr.send();
break;
} /** switch event */
}/** processToolkit */
Any help would be appreciated....