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  • Your device seems to use a line-oriented protocol, where each message ends with a CR and/or LF character. The first thing you should do is make sure you buffer the input in order to process one line at a time. See Reading Serial on the Arduino, by Majenko. Once you have this sorted out, follow chrisl's advice. Commented Jul 24, 2020 at 12:39
  • see arduino.stackexchange.com/questions/1013/… Commented Jul 24, 2020 at 16:46