Reads 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.
- stream : an instance of a class that inherits from Stream.
- buffer: the buffer to store the bytes in (char or byte)
- length : the number of bytes to read (int)