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 module'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 Arduino Software (IDE) serial monitor as well.

Hardware Required

Circuit

The WiFi module is integrated on your board and you don't need any special circuitry to get this tutorial to work.

MKR WiFi 1010 Arduino MKR WiFi 1010

Vidor Arduino MKR VIDOR 4000

UNO wifi Arduino UNO WiFi Rev.2

Please note: these three boards use dedicated pins to communicate and select the WiFi module, therefore you have no restriction in the usage of the available digital pins connected to the header pins.

Code

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.


/*

 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:

 * Board with NINA module (Arduino MKR WiFi 1010, MKR VIDOR 4000 and UNO WiFi Rev.2)

 created 18 Dec 2009

 by David A. Mellis

 modified 31 May 2012

 by Tom Igoe

 */

#include <SPI.h>
#include <WiFiNINA.h>

#include "arduino_secrets.h" 
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID;        // your network SSID (name)
char pass[] = SECRET_PASS;    // 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() {

  //Initialize serial and wait for port to open:

  Serial.begin(9600);

  while (!Serial) {

    ; // wait for serial port to connect. Needed for native USB port only

  }

  // check for the WiFi module:

  if (WiFi.status() == WL_NO_MODULE) {

    Serial.println("Communication with WiFi module failed!");

    // don&apos;t continue

    while (true);

  }

  String fv = WiFi.firmwareVersion();

  if (fv < WIFI_FIRMWARE_LATEST_VERSION) {

    Serial.println("Please upgrade the firmware");

  }

  // attempt to connect to Wifi network:

  while (status != WL_CONNECTED) {

    Serial.print("Attempting to connect to SSID: ");

    Serial.println(ssid);

    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:

    status = WiFi.begin(ssid, pass);

    // wait 10 seconds for connection:

    delay(10000);

  }

  // start the server:

  server.begin();

  // you&apos;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&apos;re attached to:

  Serial.print("SSID: ");

  Serial.println(WiFi.SSID());

  // print your board&apos;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");
}
[Get Code]

See Also:

Last revision 2018/07/12 by SM