Querying API

OK now that we know we just need to connect with SSL, so open up the Adafruit_WINC1500->WiFiSSLClient example, and change the server to api.twitch.tv

and the actual query to grab the twitch api url (you'll need to update the path and the host)

Here's the complete edited code, you'll also need to update the network SSID & password

Download: file
#include <SPI.h>
#include <Adafruit_WINC1500.h>

// Define the WINC1500 board connections below.
// If you're following the Adafruit WINC1500 board
// guide you don't need to modify these:
#define WINC_CS   8
#define WINC_IRQ  7
#define WINC_RST  4
#define WINC_EN   2     // or, tie EN to VCC and comment this out
// The SPI pins of the WINC1500 (SCK, MOSI, MISO) should be
// connected to the hardware SPI port of the Arduino.
// On an Uno or compatible these are SCK = #13, MISO = #12, MOSI = #11.
// On an Arduino Zero use the 6-pin ICSP header, see:
//   https://www.arduino.cc/en/Reference/SPI

// Setup the WINC1500 connection with the pins above and the default hardware SPI.
Adafruit_WINC1500 WiFi(WINC_CS, WINC_IRQ, WINC_RST);

// Or just use hardware SPI (SCK/MOSI/MISO) and defaults, SS -> #10, INT -> #7, RST -> #5, EN -> 3-5V
//Adafruit_WINC1500 WiFi;

char ssid[] = "networkssid"; //  your network SSID (name)
char pass[] = "password";    // 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[] = "api.twitch.tv";    // name address for Google (using DNS)

Adafruit_WINC1500SSLClient client;

void setup() {
#ifdef WINC_EN
  pinMode(WINC_EN, OUTPUT);
  digitalWrite(WINC_EN, HIGH);
#endif

  //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 presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present");
    // don't continue:
    while (true);
  }

  // attempt to connect to Wifi network:
  while (WiFi.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:
    uint8_t timeout = 10;
    while (timeout && (WiFi.status() != WL_CONNECTED)) {
      timeout--;
      delay(1000);
    }
  }

  Serial.println("Connected to wifi");
  printWifiStatus();

  Serial.println("\nStarting connection to server...");
  // if you get a connection, report back via serial:
  if (client.connect(server, 443)) {
    Serial.println("connected to server");
    // Make a HTTP request:
    client.println("GET /kraken/streams/adafruit HTTP/1.1");
    client.println("Host: api.twitch.tv");
    client.println("Connection: close");
    client.println();
  }
}

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

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

    // do nothing forevermore:
    while (true);
  }
}


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");
}

Upload to your Feather WINC and check that you can connect:

If you can connect to the SSID but then can't connect to twitch, you might be missing the SSL root cert for twitch (DigiCertGlobalRootCA)

In which case, run the instructions from this tutorial for updating the SSL certificates

Before doing so, make sure that the certs directory contains the DigiCertGlobal certificate file

Then upload the FirmwareUploader sketch & run the cert updater

Then re-upload the SSL connection test, make sure you can connect to twitch and get that json string

This guide was first published on Mar 10, 2016. It was last updated on Mar 10, 2016. This page (Querying API) was last updated on Jan 21, 2020.