tried packing 0800 message but the date and time fields are giving issues.

test0800.c

void test0800() {
	
	SDK_8583_ST8583 st_send_packet;
	s32 len;
	u8 temp[256];

	//transmission date and time
	u8 tmp[64];
	u8 datetime[15];
	u8 t_datetime[15] = {0};

	//transmission time
	u8 temptime[64];
	u8 time[8];
	u8 t_time[10] = {0};

	//transmission date
	u8 tempdate[64];
	u8 date[5];
	u8 t_date[7] = {0};

	memset(temp, 0, sizeof(tmp));
    memset(datetime, 0, sizeof(datetime));

	memset(temptime, 0, sizeof(temptime));
    memset(time, 0, sizeof(time));
	
	
	memset(tempdate, 0, sizeof(tempdate));
    memset(date, 0, sizeof(date));


	memset(&st_send_packet , 0x00, sizeof(SDK_8583_ST8583));

	
	//sdkAscToBcd(st_send_packet.ucBagData, "6000010002", 10); //e.g. 6000010002
	st_send_packet.nBagLen += 5; //5 bytes
	st_send_packet.stFiled[SDK_8583_FIELD_MSG].nFieldHead = st_send_packet.nBagLen; //S et the start position of the first field, i.e message t ype.

	len = IsoSetField(&st_send_packet , SDK_8583_FIELD_MSG, "0800", 4); // 0800 is the string
	if (len < 0){
		return len;
	}


	len = IsoSetField(&st_send_packet , SDK_8583_FIELD_MAP, "0", 0); //The length should be 0 here.
	if (len < 0){
		return len;
	}

	//processing code
	len = IsoSetField(&st_send_packet, 3, "9A0000", 6);
	if (len < 0){
		return len;
	}

	if (SDK_OK == sdkGetRtc(tmp)){ // retrieve system date and time
		sdkBcdToAsc(datetime, tmp, 6); //convert from BCD to ASC

		//join all date and time into one string
		strcat(t_datetime, datetime[0]);
		strcat(t_datetime, datetime[1]);
		strcat(t_datetime, datetime[2]);
		strcat(t_datetime, datetime[3]);
		strcat(t_datetime, datetime[4]);
		strcat(t_datetime, datetime[5]);

		//join time: hour, minute and seconds into one string
		strcat(t_time, datetime[3]);
		strcat(t_time, datetime[4]);
		strcat(t_time, datetime[5]);

		//join date: month and day into one string
		strcat(t_date, datetime[1]);
		strcat(t_date, datetime[2]);

		 
	}
 
	// transmission date and time
	len = IsoSetField(&st_send_packet, 7, t_datetime, 12);
	if (len < 0){
		return len;
	}
		

	//system trace audit
	len = IsoSetField(&st_send_packet, 11, gstAppSysCfg.stTransParam.asTraceNO, 6);
	if (len < 0){
		return len;
	}

	//transmission time
	len = IsoSetField(&st_send_packet, 12, t_time, 6);
	if (len < 0){
		return len;
	}

	//transmission date
	len = IsoSetField(&st_send_packet, 13, t_date, 4);
	if (len < 0){
		return len;
	}

	len = IsoSetField(&st_send_packet, 41, "########", 8);
	if (len < 0){
		return len;
	} 


	//check if fields exists
	bool flag;

	//judge whether field 02 exists in the request message
 	flag = sdk8583IsDomainExist(&st_send_packet, 13);

	if(flag){
		sdkDispClearScreen();
    	sdkDispFillRowRam(SDK_DISP_LINE1, 0, "yes", SDK_DISP_DEFAULT);
		sdkDispBrushScreen();
		sdkmSleep(500);
	}else{
		sdkDispClearScreen();
    	sdkDispFillRowRam(SDK_DISP_LINE1, 0, "no", SDK_DISP_DEFAULT);
		sdkDispBrushScreen();
		sdkmSleep(500);
	}




}