1. include <SPI.h>

available() inherits from the Stream utility class.

See Also

• Stream.available()

(:source lang=arduino:)

EthernetServer server = EthernetServer(23);

  EthernetClient client = server.available();

(:sourceend:)

a Client object; if no Client has data available for reading, this object will evaluate to false in an if-statement (see the example below)

// 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:

// the subnet:

  // if an incoming client connects, there will be bytes available to read:

  if (client == true) {
    // read bytes from the incoming client and write them back
    // to any clients connected to the server:

Gets a client that is connected to the server and has data available for reading. The connection persists when the returned client object goes out of scope; you can close it by calling client.stop().

Ethernet : Server class

Server class

available()

Description

Gets a client that is connected to the server and has data available for reading.

Syntax

server.available()

Parameters

None

Returns

None

Example

#include <Ethernet.h>

// network configuration.  gateway and subnet are optional.
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 10, 0, 0, 177 };
byte gateway[] = { 10, 0, 0, 1 };
byte subnet[] = { 255, 255, 0, 0 };

// telnet defaults to port 23
Server server = Server(23);

void setup()
{
  // initialize the ethernet device
  Ethernet.begin(mac, ip, gateway, subnet);

  // start listening for clients
  server.begin();
}

void loop()
{
  Client client = server.available();
  if (client) {
    server.write(client.read());
  }
}