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get_foo_message_len() should return the length of the PDU in bytes.

The example assumes that the two bytes at offset 4 in the tvb contain the length of the PDU as 16 bit value in network byte order.

As you give no other info about your protocol and there doesn't seem to be a length byte in it, you could possibly:

• Assume all PDU's are 9 bytes long and simply return 9.
• Scan the tvb looking for the terminator byte 0x03 (as long as 0x03 can't be found in the message itself), and return the offset of that byte + 1.
• Return something else that is the correct value for your protocol.