Tutorial.WiFiChatServer History

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April 11, 2013, at 07:38 PM by Federico -
Changed lines 37-136 from:
(:source lang=arduino tabwidth=4:)
/*
Chat Server

A simple server that distributes any incoming messages to all
connected clients. To use telnet to your device's IP address and type.
You can see the client's input in the serial monitor as well.

This example is written for a network using WPA encryption. For
WEP or WPA, change the Wifi.begin() call accordingly.


Circuit:
* WiFi shield attached

created 18 Dec 2009
by David A. Mellis
modified 23 Apr 2012
by Tom Igoe

*/

#include <SPI.h>
#include <WiFi.h>

char ssid[] = "YourNetwork"; // your network SSID (name)
char pass[] = "password"; // your network password (use for WPA, or use as key for WEP)

int keyIndex = 0; // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;

WiFiServer server(23);

boolean alreadyConnected = false; // whether or not the client was connected previously

void setup() {
// start serial port:
Serial.begin(9600);

// attempt to connect to Wifi network:
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
status = WiFi.begin(ssid, pass);
// wait 10 seconds for connection:
delay(10000);
}
// start the server:
server.begin();
// you're connected now, so print out the status:
printWifiStatus();
}


void loop() {
// wait for a new client:
WiFiClient client = server.available();


// when the client sends the first byte, say hello:
if (client) {
if (!alreadyConnected) {
// clead out the input buffer:
client.flush();
Serial.println("We have a new client");
client.println("Hello, client!");
alreadyConnected = true;
}

if (client.available() > 0) {
// read the bytes incoming from the client:
char thisChar = client.read();
// echo the bytes back to the client:
server.write(thisChar);
// echo the bytes to the server as well:
Serial.write(thisChar);
}
}
}


void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());

// print your WiFi shield's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);

// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}

(:sourceend:)
to:
(:source http://arduino.cc/en/pub/code/master/libraries/WiFi/examples/WiFiChatServer/WiFiChatServer.ino lang=arduino tabwidth=4:)
July 31, 2012, at 11:01 PM by Scott Fitzgerald -
Changed lines 37-136 from:
(:source http://arduino.cc/en/pub/code/master/libraries/WiFi/examples/WiFiChatServer/WiFiChatServer.ino lang=arduino tabwidth=4:)
to:
(:source lang=arduino tabwidth=4:)
/*
Chat Server

A simple server that distributes any incoming messages to all
connected clients. To use telnet to your device's IP address and type.
You can see the client's input in the serial monitor as well.

This example is written for a network using WPA encryption. For
WEP or WPA, change the Wifi.begin() call accordingly.


Circuit:
* WiFi shield attached

created 18 Dec 2009
by David A. Mellis
modified 23 Apr 2012
by Tom Igoe

*/

#include <SPI.h>
#include <WiFi.h>

char ssid[] = "YourNetwork"; // your network SSID (name)
char pass[] = "password"; // your network password (use for WPA, or use as key for WEP)

int keyIndex = 0; // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;

WiFiServer server(23);

boolean alreadyConnected = false; // whether or not the client was connected previously

void setup() {
// start serial port:
Serial.begin(9600);

// attempt to connect to Wifi network:
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
status = WiFi.begin(ssid, pass);
// wait 10 seconds for connection:
delay(10000);
}
// start the server:
server.begin();
// you're connected now, so print out the status:
printWifiStatus();
}


void loop() {
// wait for a new client:
WiFiClient client = server.available();


// when the client sends the first byte, say hello:
if (client) {
if (!alreadyConnected) {
// clead out the input buffer:
client.flush();
Serial.println("We have a new client");
client.println("Hello, client!");
alreadyConnected = true;
}

if (client.available() > 0) {
// read the bytes incoming from the client:
char thisChar = client.read();
// echo the bytes back to the client:
server.write(thisChar);
// echo the bytes to the server as well:
Serial.write(thisChar);
}
}
}


void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());

// print your WiFi shield's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);

// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}

(:sourceend:)
April 25, 2012, at 06:22 PM by Scott Fitzgerald -
Changed lines 24-25 from:
%height=300px%[[Attach:EthernetShield_bb.png | Attach:EthernetShield_bb.png]]
to:
%height=300px%[[Attach:WiFiShield_bb.png | Attach:WiFiShield_bb.png]]

Changed lines 33-37 from:
!!!Schematic
(:div class=circuit :)
%height=300px%[[Attach:EthernetShield_sch.png | Attach:EthernetShield_sch.png]]
(:divend:)
to:
April 21, 2012, at 12:16 AM by Scott Fitzgerald -
Added lines 1-45:
''Examples > WiFi Library''

!!!WiFi Chat Server

A simple server that distributes any incoming messages to all connected clients. To use, open a terminal window, telnet to your WiFi shield's IP address, and type away. Any incoming text will be sent to all connected clients (including the one typing). Additionally, you will be able to see the client's input in your serial monitor as well.

(:div class=BOM :)
!!!Hardware Required
* Arduino WiFi Shield
* Shield-compatible Arduino board
(:divend:)

!!!Circuit
(:div class=circuit :)

The WiFi shield uses pins 10, 11, 12, and 13 for the SPI connection to the HDG104 module. Digital pin 4 is used to control the slave select pin on the SD card.

You should have access to a 802.11b/g wireless network that connects to the internet for this example. You will need to change the network settings in the sketch to correspond to your particular networks SSID.

For networks using WPA/WPA2 Personal encryption, you need the SSID and password. The shield will not connect to networks using WPA2 Enterprise encryption.

WEP network passwords are hexadecimal strings known as keys. A WEP network can have 4 different keys; each key is assigned a "Key Index" value. For WEP encrypted networks, you need the SSID, the key, and key number.

%height=300px%[[Attach:EthernetShield_bb.png | Attach:EthernetShield_bb.png]]

[-image developed using [[http://www.fritzing.org |Fritzing]]. For more circuit examples, see the [[http://fritzing.org/projects/|Fritzing project page]] -]

'''''In the above image, the Arduino would be stacked below the WiFi shield.'''''

(:divend:)

!!!Schematic
(:div class=circuit :)
%height=300px%[[Attach:EthernetShield_sch.png | Attach:EthernetShield_sch.png]]
(:divend:)

'''Code:'''

(:div class=code :)
(:source http://arduino.cc/en/pub/code/master/libraries/WiFi/examples/WiFiChatServer/WiFiChatServer.ino lang=arduino tabwidth=4:)
(:divend:)


!!!See Also:
(:include WiFiTutorialSeeAlsoInclude:)

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