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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 <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) {
// read bytes from the incoming client and write them back
// to any clients connected to the server:
server.write(client.read());
}
}
See Also
Corrections, suggestions, and new documentation should be posted to the Forum.
The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.
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