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I'm just now learning how to connect the Pi3 to a serial device (other microcontroller) and want to pass bytes of data back and forth. Most of the examples I see look like they pass ascii data. In my case that is not the desired method because I may possibly send a zero byte which would then be considered a null and terminate the string. I saw your post and was wondering if you are faced with the same situation when reading the RFID tag and if you found a solution.
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