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my $base64 = encode_base64("<some data>");

$sock->send("<data>$base64\n") or die "Can't write to $socket";

$sock->send("<data>$base64<param>\n") or die "Can't write to $socket";

  encode_base64($str, $eol);

...
    The first argument is the string to encode. The second
    argument is the line-ending sequence to use. It is
    optional and defaults to "\n".