Read a byte from the file without advancing to the next one. That is, successive calls to peek() will return the same value, as will the next call to read().
This function is part of the Stream class and is called by any class that inherits from it (Wire, Serial, etc).
stream : an instance of a class that inherits from Stream.
The next byte (or character), or -1 if none is available.
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The text of the 86Duino reference is a modification of the Arduino reference and is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain