WiFiNINA - client.connectSSL()


Connect to the IP address and port specified in the constructor using the SSL protocol. The method connectSSL is required when the server provides only HTTPS connections. Before using this method, it is required to load the SSL certificate used by the server into the Arduino WiFi module . The boards come already loaded with certificates and it should be ready to use. To change or upload new SSL certificates you should follow the procedures that will be made available. connectSSL() also supports DNS lookups when using a domain name (e.g., google.com).


client.connectSSL(ip, port)
client.connectSSL(URL, port)


  • ip: the IP address that the client will connect to (array of 4 bytes)
  • URL: the domain name the client will connect to (string e.g., “arduino.cc”)
  • port: the port that the client will connect to (int)


Returns true if the connection succeeds, false if not.



  Web client

 This sketch connects to a website through an SSL connection
 using a WiFi board.

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

 * WiFiNINA supported board

 created 13 July 2010
 by dlf (Metodo2 srl)
 modified 31 May 2012
 by Tom Igoe

#include <SPI.h>
#include <WiFiNINA.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;
char server[] = "arduino.tips";    // name address for Arduino (using DNS)

// Initialize the WiFi 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 Leonardo only

  // 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.connectSSL(server, 443)) {
    Serial.println("Connected to server");
    // Make a HTTP request:
    client.println("GET /asciilogo.txt HTTP/1.1");
    client.println("Host: arduino.tips");
    client.println("Connection: close");
    Serial.println("Request sent");

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);