Write data to all the clients connected to a server. This data is sent as a byte or series of bytes.


server.write(val)\ server.write(buf, len)


val: a value to send as a single byte (byte or char)

buf: an array to send as a series of bytes (byte or char)

len: the length of the buffer


byte\ write() returns the number of bytes written. It is not necessary to read this.


#include <SPI.h>
#include <Ethernet.h>
// network configuration.  gateway and subnet are optional.
 // the media access control (ethernet hardware) address for the shield:
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
//the IP address for the shield:
byte ip[] = { 10, 0, 0, 177 };
// the router's gateway address:
byte gateway[] = { 10, 0, 0, 1 };
// the subnet:
byte subnet[] = { 255, 255, 0, 0 };
// telnet defaults to port 23
EthernetServer server = EthernetServer(23);
void setup()
  // initialize the ethernet device
  Ethernet.begin(mac, ip, gateway, subnet);
  // start listening for clients
void loop()
  // if an incoming client connects, there will be bytes available to read:
  EthernetClient client = server.available();
  if (client == true) {
    // read bytes from the incoming client and write them back
    // to any clients connected to the server:

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