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####    STX                          1 byte (0x02)
####    byte count                   8 bytes, leading zeros, inclusive
+ of wrapper (payload length + 18)
####    reserved                     8 bytes, all zeros (required and 
+reserved for future use)
####    payload                        (Data record to send)
####    ETX                          1 byte (0x03)

 
my $hex02 = 0x2; 
my $hex03 = 0x3;
...
# Max length is 300000
# If hit here, too long ... by a LOT
print "Formated Message exceeds MaxMessageLength\n\n";