readBytes() read characters from a stream into a buffer. The function terminates if the determined length has been read, or it times out (see setTimeout()).
readBytes() returns the number of bytes placed in the buffer. A 0 means no valid data was found.
This function is part of the Stream class, and is called by any class that inherits from it (Wire, Serial, etc). See the stream/Stream class main page for more information.
The number of bytes placed in the buffer
The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.