message output not working due to BitCount and Length being zero

Question

I'm kind of new to CAPL. Today I am trying to use the output function for sending UDS messages on CAN, using a simple code below:

      UdsReq.dir = 1;
      UdsReq.byte(0) = 0x02;
      UdsReq.byte(1) = 0x10;
      UdsReq.byte(2) = 0x03;
      output(UdsReq);

However, the issue I am facing currently is that even if the messages are sent out on correct ID, there is no response. Whereas if I use the Diag Console to send the same messages manually, it is getting answered just right.

If I compare CAN logs for both, the "Length" and BitCount values are zero in the CAPL generated messages. I am unable to set these fields, seem to be read-only.

• CAPL generated:

 0.050000 1  7B0    Tx   d 8 02 10 03 00 00 00 00 00  Length = 0 BitCount = 0 ID = 1968
 0.150000 1  7B0    Tx   d 8 02 27 01 00 00 00 00 00  Length = 0 BitCount = 0 ID = 1968

• Sent manually via diag console:

 8.893776 1  7B0    Tx   d 8 02 10 03 00 00 00 00 00  Length = 240244 BitCount = 123 ID = 1968  // 1  OTP(01) Atom 7B0->7B8 : SF Length:   02   [ 10 03 ]
 8.899728 1  7B8    Rx   d 8 06 50 03 00 32 01 F4 00  Length = 233911 BitCount = 121 ID = 1976  // 1  OTP(02) Atom 7B8->7B0 : SF Length:   06   [ 50 03 00 32 01 F4 ]
11.034792 1  7B0    Tx   d 8 02 27 01 00 00 00 00 00  Length = 240244 BitCount = 123 ID = 1968  // 1  OTP(03) Atom 7B0->7B8 : SF Length:   02   [ 27 01 ]
11.039620 1  7B8    Rx   d 8 06 67 01 B6 2F C0 FC 00  Length = 231925 BitCount = 120 ID = 1976  // 1  OTP(04) Atom 7B8->7B0 : SF Length:   06   [ 67 01 B6 2F C0 FC ]

My inferences:

1. Length and BitCount are coming as zero in CAPL generated messages. This must have made the frames invalid. However, I cannot modify these fields - it is read only.
2. Initially the CAPL messages were being displayed as TxRq (option is unticked in the simulation setup settings). Hence I have manually set .dir = 1. Does this have something to do with it?

What could the reason be? Any help is greatly appreciated.