Playing with hex and characters

hex_play.rb

raw_data = <<-EOF
0000 0048 0000 0005 0000 0000 0000 0092
0001 0134 3437 3739 3935 3734 3435 3200
0101 3434 3739 3835 3133 3937 3331 0000
0000 0000 0000 0000 0f41 626f 7574 20bb
3435 302c 3030 303f
EOF

raw_data = <<-EOF
0001 0134 3437 3739 3935 3734 3435 3200
0101 3434 3739 3835 3133 3937 3331 0000
0000 0000 0000 0000 0f41 626f 7574 20bb
3435 302c 3030 303f
EOF

kalv_data = <<-EOF
4c 6574 2773 2063 6865 636b 2074 6869 7320 bb32 2069 7320 7468 6520 7661 6c75 652e
EOF

#kalv_data = "bb"


hex_data = [kalv_data.chomp.gsub(" ","").gsub(/\n/,"")].pack("H*")
p hex_data
#[146, 0, "\000\001\001447799574452\000\001\001447985139731\000\000\000\000\000\000\000\000\000\000\017About \273450,000?"]
# p header = hex_data[0..15]
# len, cmd, status, seq = header.unpack('N4')

body = hex_data#[16..-1]

a = body.unpack('Z*CCZ*CCZ*CCCZ*Z*CCCCCa*')
sm_length = a[-2]
remaining_bytes = a[-1]
p a
short_message = remaining_bytes.slice!(0...sm_length)
# 
p short_message.unpack('C*')