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CYTRON WIFI SHIELD REV2.0 client problem

PostPosted: Wed Apr 05, 2017 4:25 pm
by nazri94

I just bought Cytron Wifi Shield Rev2.0 last week. I used it with Arduino Mega2560. I got no problem connecting to wifi. However, i have a problem to connect the arduino to a server as a client. I just try to run the all the client example, it give respond "Failed to connect to server". I run HTTPSClient example, HTTPSGoogleform example and CytronWifiDemo example and all of it give the same respond.

below is the HTTPS example code.

 *  HTTP over TLS (HTTPS) example sketch
 *  This example demonstrates how to use
 *  secure_connect function to access HTTPS API.
 *  We fetch and display the status of
 *  esp8266/Arduino project continuous integration
 *  build.
 *  Created by Ivan Grokhotkov, 2015.
 *  This example is in public domain.
 *  Modified by Ng Beng Chet, 2016

#include <CytronWiFiShield.h>
#include <CytronWiFiClient.h>
#include <SoftwareSerial.h>

const char* ssid = "Connectify-me";
const char* pass = "syaza1994";

const char* host = "";
const int httpsPort = 443;

void setup() {
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  if(!wifi.begin(10, 11))
    Serial.println(F("Error talking to shield"));
  Serial.println(F("Start wifi connection"));
  if(!wifi.connectAP(ssid, pass))
    Serial.println(F("Error connecting to WiFi"));
  Serial.print(F("Connected to: "));Serial.println(wifi.SSID());
  Serial.print(F("IP address: "));Serial.println(wifi.localIP());

  ESP8266Client client;
  Serial.print("Connecting to ");
  if (!client.secure_connect(host, httpsPort))
    Serial.println(F("Failed to connect to server."));
  String url = "/repos/esp8266/Arduino/commits/master/status";
  Serial.print("requesting URL: ");

  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" +
               "User-Agent: BuildFailureDetectorESP8266\r\n" +
               "Connection: close\r\n\r\n");

  Serial.println("request sent");
  //set 5 seconds timeout for response from server
  int i=5000;
  while (client.available()<=0&&i--)
    if(i==1) {
    if (client.find("\r\n\r\n"))
      Serial.println(F("headers received"));

    String line = client.readStringUntil('\n');
    if (line.startsWith("{\"state\":\"success\""))
      Serial.println(F("esp8266/Arduino CI successfull!")); 
      Serial.println(F("esp8266/Arduino CI has failed"));
    Serial.println(F("reply was:"));
    Serial.println(F("closing connection"));
    //flush the rest of received data

void loop() {

The other code is the same as the example in the library. By the way, i also try to run the SimpleWifiWebserver example, it can run smoothly.

Can anyone help me to solve this problem. This is because i want to use client library for my project. Thank you in advance.

Re: CYTRON WIFI SHIELD REV2.0 client problem

PostPosted: Thu Apr 06, 2017 9:44 am
by bengchet

Lets try with CytronWiFiDemo sketch first for HTTP connection as client first. We will deal with HTTPS connection later on. In the sketch try to comment/remove the line wifi.config(ip) to allow wifi shield to get random IP address assigned by your network router.

Re: CYTRON WIFI SHIELD REV2.0 client problem

PostPosted: Thu Apr 06, 2017 1:59 pm
by nazri94
Wow! it is working!! Thank you very much! I also try to make a connection to my local server and it is working...this is really helping me... btw, can u tell me why wifi.config is not working in the sketch? and also what is the possible problem for the https example?

Here i attach the response of the sketch

Re: CYTRON WIFI SHIELD REV2.0 client problem

PostPosted: Thu Apr 06, 2017 4:20 pm
by bengchet

It is because of your network IP address. If you wish to use static IP address, you can use wifi.config(ip). However, you should change IP address ip in form instead of But if you wish not to use static IP address, you can just ignore it.

As for HTTPS connection, it is due to AT firmware is not updated. Do check our user manual 8.0 firmware installation to update the firmware. This firmware adds functionality HTTPS client connection and 3v3 GPIO control.