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WiFiNINA : Server class
Prints data, followed by a newline, to all the clients connected to a server. Prints numbers as a sequence of digits, each an ASCII character (e.g. the number 123 is sent as the three characters '1', '2', '3').
server.println()
server.println(data)
server.println(data, BASE)
data (optional): the data to print (char, byte, int, long, or string)
BASE (optional): the base in which to print numbers: DEC for decimal (base 10), OCT for octal (base 8), HEX for hexadecimal (base 16).
byte
println() will return the number of bytes written, though reading that number is optional
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