Arduino Function: WiFiLinkServer.write

Description

This function writes data to all the clients connected to a server.

Syntax

server.write(data)

Parameters

  • data: the value to write (byte or char)

Returns

 byte: the number of bytes written. It is not necessary to read this.

Examples

/*
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:
* Arduino Primo or STAR OTTO or Uno WiFi Developer Edition (with WiFi Link firmware running)

created 18 Dec 2009
by David A. Mellis
modified 31 May 2012
by Tom Igoe
modified 10 March 2017
by Sergio Tomasello and Andrea Cannistrá
*/


#include <WiFiLink.h>

char ssid[] = "yourNetwork"; // your network SSID (name)
char pass[] = "secretPassword"; // 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 Leonardo only
}

//Check if communication with wifi module has been established
if (WiFi.status() == WL_NO_WIFI_MODULE_COMM) {
Serial.println("Communication with WiFi module not established.");
while (true); // don't continue:
}

// 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'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");
}


Based on the reference originally written by Arduino Community,  wiring.org.co and  arduino.cc