find() reads data from the stream until the target is found. The function returns true if target is found, false if timed out (see ../streamsettimeout[Stream.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.
stream : an instance of a class that inherits from Stream.
target : the string to search for (char)
length : length of the target (size_t)