Print data, followed by a newline, to all the clients connected to a server.
Prints numbers as a sequence of digits. Each digit is an ASCII character (e.g. the number 123 is sent as the three characters '1', '2', '3').
data (optional): the data to print (char, byte, int, long, or string)
*base (optional): the base in which to print numbers: BIN for binary (base 2), DEC for decimal (base 10), OCT for octal (base 8), HEX for hexadecimal (base 16).
The println() function will return a byte containing the number of bytes written