Re: Character in 'b' format wrapped in unpack

[ikegami]

printf "%v02X\n", $x;

gives

AA.154.AA.154

You created characters that are too large for bytes, and `b` expects the characters to be bytes. Maybe

substr( $x, $_, 1 )) << 1

should be

( substr( $x, $_, 1 )) << 1 ) & 0xFF