Merge pull request #192 from brentru/add-esp32-esp32s2-example

Add usage example for ESP32 SSL/TLS

Author: brentru

examples/adafruitio_secure_esp32/.esp8266.test.skip

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+

examples/adafruitio_secure_esp32/.zero.test.skip

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+

examples/adafruitio_secure_esp32/adafruitio_secure_esp32.ino

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+/***********************************************************************
+  Adafruit MQTT Library ESP32 Adafruit IO SSL/TLS example
+
+  Use the latest version of the ESP32 Arduino Core:
+    https://github.com/espressif/arduino-esp32
+
+  Works great with Adafruit Huzzah32 Feather and Breakout Board:
+    https://www.adafruit.com/product/3405
+    https://www.adafruit.com/products/4172
+
+  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.
+  Modified by Brent Rubell for Adafruit Industries
+  MIT license, all text above must be included in any redistribution
+ **********************************************************************/
+#include <WiFi.h>
+#include "WiFiClientSecure.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 root CA
+const char* adafruitio_root_ca = \
+    "-----BEGIN CERTIFICATE-----\n" \
+    "MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh\n" \
+    "MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3\n" \
+    "d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBD\n" \
+    "QTAeFw0wNjExMTAwMDAwMDBaFw0zMTExMTAwMDAwMDBaMGExCzAJBgNVBAYTAlVT\n" \
+    "MRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5j\n" \
+    "b20xIDAeBgNVBAMTF0RpZ2lDZXJ0IEdsb2JhbCBSb290IENBMIIBIjANBgkqhkiG\n" \
+    "9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4jvhEXLeqKTTo1eqUKKPC3eQyaKl7hLOllsB\n" \
+    "CSDMAZOnTjC3U/dDxGkAV53ijSLdhwZAAIEJzs4bg7/fzTtxRuLWZscFs3YnFo97\n" \
+    "nh6Vfe63SKMI2tavegw5BmV/Sl0fvBf4q77uKNd0f3p4mVmFaG5cIzJLv07A6Fpt\n" \
+    "43C/dxC//AH2hdmoRBBYMql1GNXRor5H4idq9Joz+EkIYIvUX7Q6hL+hqkpMfT7P\n" \
+    "T19sdl6gSzeRntwi5m3OFBqOasv+zbMUZBfHWymeMr/y7vrTC0LUq7dBMtoM1O/4\n" \
+    "gdW7jVg/tRvoSSiicNoxBN33shbyTApOB6jtSj1etX+jkMOvJwIDAQABo2MwYTAO\n" \
+    "BgNVHQ8BAf8EBAMCAYYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUA95QNVbR\n" \
+    "TLtm8KPiGxvDl7I90VUwHwYDVR0jBBgwFoAUA95QNVbRTLtm8KPiGxvDl7I90VUw\n" \
+    "DQYJKoZIhvcNAQEFBQADggEBAMucN6pIExIK+t1EnE9SsPTfrgT1eXkIoyQY/Esr\n" \
+    "hMAtudXH/vTBH1jLuG2cenTnmCmrEbXjcKChzUyImZOMkXDiqw8cvpOp/2PV5Adg\n" \
+    "06O/nVsJ8dWO41P0jmP6P6fbtGbfYmbW0W5BjfIttep3Sp+dWOIrWcBAI+0tKIJF\n" \
+    "PnlUkiaY4IBIqDfv8NZ5YBberOgOzW6sRBc4L0na4UU+Krk2U886UAb3LujEV0ls\n" \
+    "YSEY1QSteDwsOoBrp+uvFRTp2InBuThs4pFsiv9kuXclVzDAGySj4dzp30d8tbQk\n" \
+    "CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=\n" \
+    "-----END CERTIFICATE-----\n";
+
+/****************************** 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());
+
+  // Set Adafruit IO's root CA
+  client.setCACert(adafruitio_root_ca);
+}
+
+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!");
+}

library.properties

@@ -1,5 +1,5 @@
 name=Adafruit MQTT Library
-version=2.1.0
+version=2.1.1
 author=Adafruit
 maintainer=Adafruit <info@adafruit.com>
 sentence=MQTT library that supports the FONA, ESP8266, Yun, and generic Arduino Client hardware.