Arduino Reference - ServerAvailable

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Ethernet : Server class

available()

Description

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().

available() inherits from the Stream utility class.

Syntax

server.available()

Parameters

None

Returns

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)

Example

#include <Ethernet.h>
#include <SPI.h>

// 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
server.begin();
}

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:
server.write(client.read());
}
}

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