Adafruit_MQTT_Library/examples/adafruitio_secure_esp8266/adafruitio_secure_esp8266.ino

/***************************************************
  Adafruit MQTT Library ESP8266 Adafruit IO SSL/TLS example

  Must use the latest version of ESP8266 Arduino from:
    https://github.com/esp8266/Arduino

  Works great with Adafruit's Huzzah ESP board & Feather
  ----> https://www.adafruit.com/product/2471
  ----> https://www.adafruit.com/products/2821

  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Tony DiCola for Adafruit Industries.
  SSL/TLS additions by Todd Treece for Adafruit Industries.
  MIT license, all text above must be included in any redistribution
 ****************************************************/
#include <ESP8266WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"

/************************* WiFi Access Point *********************************/

#define WLAN_SSID       "WLAN_SSID"
#define WLAN_PASS       "WIFI_PASSWORD"

/************************* Adafruit.io Setup *********************************/

#define AIO_SERVER      "io.adafruit.com"
// Using port 8883 for MQTTS
#define AIO_SERVERPORT  8883
// Adafruit IO Account Configuration
// (to obtain these values, visit https://io.adafruit.com and click on Active Key)
#define AIO_USERNAME    "YOUR_ADAFRUIT_IO_USERNAME"
#define AIO_KEY         "YOUR_ADAFRUIT_IO_KEY"

/************ Global State (you don't need to change this!) ******************/

// WiFiFlientSecure for SSL/TLS support
WiFiClientSecure client;

// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);

// io.adafruit.com SHA1 fingerprint
/* WARNING - This value was last updated on 08/15/22 and may not be up-to-date!
*  If security is a concern for your project, we strongly recommend users impacted by this moving
*  to ESP32 which has certificate verification by storing root certs and having a
*  chain-of-trust rather than doing individual certificate fingerprints.
*/
static const char *fingerprint PROGMEM = "18 C0 C2 3D BE DD 81 37 73 40 E7 E4 36 61 CB 0A DF 96 AD 25";

/****************************** Feeds ***************************************/

// Setup a feed called 'test' for publishing.
// Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname>
Adafruit_MQTT_Publish test = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/test");

/*************************** Sketch Code ************************************/

void setup() {
  Serial.begin(115200);
  delay(10);

  Serial.println(F("Adafruit IO MQTTS (SSL/TLS) Example"));

  // Connect to WiFi access point.
  Serial.println(); Serial.println();
  Serial.print("Connecting to ");
  Serial.println(WLAN_SSID);

  delay(1000);

  WiFi.begin(WLAN_SSID, WLAN_PASS);
  delay(2000);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();

  Serial.println("WiFi connected");
  Serial.println("IP address: "); Serial.println(WiFi.localIP());

  // check the fingerprint of io.adafruit.com's SSL cert
  client.setFingerprint(fingerprint);
}

uint32_t x=0;

void loop() {
  // Ensure the connection to the MQTT server is alive (this will make the first
  // connection and automatically reconnect when disconnected).  See the MQTT_connect
  // function definition further below.
  MQTT_connect();

  // Now we can publish stuff!
  Serial.print(F("\nSending val "));
  Serial.print(x);
  Serial.print(F(" to test feed..."));
  if (! test.publish(x++)) {
    Serial.println(F("Failed"));
  } else {
    Serial.println(F("OK!"));
  }

  // wait a couple seconds to avoid rate limit
  delay(2000);

}

// Function to connect and reconnect as necessary to the MQTT server.
// Should be called in the loop function and it will take care if connecting.
void MQTT_connect() {
  int8_t ret;

  // Stop if already connected.
  if (mqtt.connected()) {
    return;
  }

  Serial.print("Connecting to MQTT... ");

  uint8_t retries = 3;
  while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
       Serial.println(mqtt.connectErrorString(ret));
       Serial.println("Retrying MQTT connection in 5 seconds...");
       mqtt.disconnect();
       delay(5000);  // wait 5 seconds
       retries--;
       if (retries == 0) {
         // basically die and wait for WDT to reset me
         while (1);
       }
  }

  Serial.println("MQTT Connected!");
}