Your problem is in the use of unpack("B*", ...)
there takes raw binary data and turn it into
a human-readable string of 1s and 0s.
The pack you
are using already returns a raw data that is probably
suitable for sending over the socket.
(agh! see update
You should probably be using syswrite or you should
turn off buffering.
Oops, mental error, the pack format's wrong. See
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