In this tutorial is shown how to connect to a website (http://www.google.com), using the WiFi Link library on the Arduino STAR OTTO.

Use the Arduino IDE 1.8.x  and import the WiFi Link library using the Library Manager.

WiFi Link library



Connect the board directly to PC using an USB cable.



Now, modify the below sketch inserting the name and the password of your network and after upload the code using Arduino IDE.
This example is written for a WPA encryption network. If you want to use it  for WEP or WPA, change the Wifi.begin() call accordingly.

You can use directly the WiFi Link examples present into IDE but remember you to replace the Serial with SerialUSB.

Use the Arduino IDE 1.8.x and check that you have already downloaded the corresponding platform (Arduino STM32F4 Boards) from the Board Manager

Web client

This sketch connects to a website (http://www.google.com)
using an Arduino board with WiFi Link.

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

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

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

created 13 July 2010
by dlf (Metodo2 srl)
modified 31 May 2012
by Tom Igoe
modified 10 March 2017
by Sergio Tomasello and Andrea Cannistrá

#include <WiFiLink.h>
#define Serial SerialUSB
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;
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128); // numeric IP for Google (no DNS)
char server[] = "www.google.com"; // name address for Google (using DNS)

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
WiFiClient client;

void setup() {
//Initialize serial and wait for port to open:
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port 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: ");
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);

// wait 10 seconds for connection:
Serial.println("Connected to wifi");

Serial.println("\nStarting connection to server...");
// if you get a connection, report back via serial:
if (client.connect(server, 80)) {
Serial.println("connected to server");
// Make a HTTP request:
client.println("GET /search?q=arduino HTTP/1.1");
client.println("Host: www.google.com");
client.println("Connection: close");

void loop() {
// if there are incoming bytes available
// from the server, read them and print them:
while (client.available()) {
char c = client.read();

// if the server's disconnected, stop the client:
if (!client.connected()) {
Serial.println("disconnecting from server.");

// do nothing forevermore:
while (true);

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

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

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


Open  the Serial Monitor to see the output:

webclient output