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$ob->write("\x30\x31\x32");
    
...
        $ob->lookclear; # needed to prevent blocking
        sleep (0.2);
    }

30 31 32          012             
33                3

RX> 3
    (a)    3 eq \x33
    (c)    3 qe 3
    (d)    3 eq hex($gotit)
    (e)    3 == 3

[RX]123
[TX]3