well as you can from the code snippet at the beginning:

@data = unpack('C C C C C C C C C C3 C3 C5 C5 C3 C3 C3 C C3 C C12 C20'
+, $buffer);
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So I would expect that @data array would contain 21 items...each item should be as long as it is specified in the template so C - means ONE unsigned char , C5 - FIVE unsigned chars and so on... so I would like the data in $buffer to be unpacked into these 21 items (f0, ..., last twenty bytes - since the last template says C20) That is what I want...SPLIT THE DATA into the @data array...