Description: arduino soft serial port, you can achieve any io pins, defined as serial
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SoftwareSerial
..............\arch
..............\....\avr
..............\....\...\SoftwareSerial.cpp
..............\....\...\SoftwareSerial_Class.h
..............\....\sam
..............\....\...\SoftwareSerial.cpp
..............\....\...\SoftwareSerial_Class.h
..............\examples
..............\........\SoftwareSerialExample
..............\........\.....................\SoftwareSerialExample.ino
..............\........\TwoPortReceive
..............\........\..............\TwoPortReceive.ino
..............\keywords.txt
..............\library.properties
..............\src
..............\...\SoftwareSerial.h