설명
readString() reads characters from a stream into a String. The function terminates if it times out (see setTimeout()).
This function is part of the Stream class, and can be called by any class that inherits from it (Wire, Serial, etc). See the Stream class main page for more information.
문법
stream.readString()
매개변수
stream : an instance of a class that inherits from Stream
반환
String을 stream 에서 읽음.