On Sat, Feb 18, 2017 at 09:24:09AM +0100, Alexander Burger wrote:
>    (out "/dev/ttyACM0"
>        ... )
> 
>    (in "/dev/ttyACM0"
>        ... )

Some devices don't like it very much to be opened and closed all the time
(losing queued data, for example). In that case, you could try:

   (let? Dev (open "/dev/ttyACM0")
      (loop
         (in Dev
            ... )
         ...
         (out Dev
            ... ) ) )

♪♫ Alex
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