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+/* ESP8266 AWS IoT
+ *  
+ * Simplest possible example (that I could come up with) of using an ESP8266 with AWS IoT.
+ * No messing with openssl or spiffs just regular pubsub and certificates in string constants
+ * 
+ * This is working as at 3rd Aug 2019 with the current ESP8266 Arduino core release:
+ * SDK:2.2.1(cfd48f3)/Core:2.5.2-56-g403001e3=20502056/lwIP:STABLE-2_1_2_RELEASE/glue:1.1-7-g82abda3/BearSSL:6b9587f
+ * 
+ * Author: Anthony Elder 
+ * License: Apache License v2
+ */
+#include <ESP8266WiFi.h>
+#include <PubSubClient.h>
+extern "C" {
+#include "libb64/cdecode.h"
+}
+
+const char* ssid = "<yourSSID>";
+const char* password = "<yourPSWD>";
+
+// Find this awsEndpoint in the AWS Console: Manage - Things, choose your thing
+// choose Interact, its the HTTPS Rest endpoint 
+const char* awsEndpoint = "xxxxxxxxxx.iot.us-west-2.amazonaws.com";
+
+// For the two certificate strings below paste in the text of your AWS 
+// device certificate and private key, comment out the BEGIN and END 
+// lines, add a quote character at the start of each line and a quote 
+// and backslash at the end of each line:
+
+// xxxxxxxxxx-certificate.pem.crt
+const String certificatePemCrt = \
+//-----BEGIN CERTIFICATE-----
+"MIIDWTCCAkGgAwIBAgIUQNkz+5jPnrBkY+0xAK7oIPZSvWwwDQYJKoZIhvcNAQEL" \
+"BQAwTTFLMEkGA1UECwxCQW1hem9uIFdlYiBTZXJ2aWNlcyBPPUFtYXpvbi5jb20g" \
+"SW5jLiBMPVNlYXR0bGUgU1Q9V2FzaGluZ3RvbiBDPVVTMB4XDTE3MTIxNzEwNDMy" \
+"OFoXDTQ5MTIzMTIzNTk1OVowHjEcMBoGAaseAwwTQVdTIElvVCBDZXJ0aWZpY2F0" \
+"ZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAPAG3DPHYLqwhRrp5erJ" \
+"6Nn24IGCGwMKGTU5mF2cBDPnwcTdAA8kX71EuhRBqhNM5zhxmsWj+zAmXfMKKT7L" \
+"pvRfFyca1BwZH2bYBDmJbyITJAnljR6Jh6lPdGPm0vx2uaVYmI2s2pjQeVyKHl5I" \
+"AFJpTGzoVZtxy4EeDmDFhiDrEGNqpzDEBRcNnyEN1fB7uvfSt9CgXMrjH2kFExHU" \
+"CGCQwabWhwrpFmKmXo2gDKf5h221XdC9162kOzCgDcU+kL00cAHD4avYOro0p9W7" \
+"GPwXeMhWieCDTjtIsps/ECd26lLlCzRfdTWqjrmZtKVpFyNXCZ9PLq3TDM/l9y0j" \
+"mI0CAwEAAaNgMF4wHwYDVR0jBBgwFoAU/gnLwuy6sBTHz/XqmgIMARMfU7EwHQYD" \
+"VR0OBBYEFHIbCyR1g2WNGzwNYKUQ1y/63ojCMAwGA1UdEwEB/wQCMAAwDgYDVR0P" \
+"AQH/BAQDAgeAMA0GCSqGSIb3DQEBCwUAA4IBAQBFmQZU+iVcFVeQP1HhbzVOOEAC" \
+"qbg4J4N0F1nL3woQBaP6dc1kzB6V4+rhkHec86A+jzqVMvx14Db9ROVNPRJU2Faa" \
+"DIwdLDvJVqrcBUvNsnsZZw+vq+i0foP5AI0vU9TqMgkIPJRSXjrRJrykQyMfyrOt" \
+"zHG7+NMe3qKnOYclMso0hb1vUpyM8T1An5p+dFP8BrBBHLakRLf2wT9b0TMDHoLi" \
+"vyYczV3OLn62Y8ukZPxfBHOKwrrm10bDVAPd2twM9DbIlZnWkZ/L80pztUlMDi96" \
+"9MP9jfHlJLDFu5pLv42p3Lpd+6YWAvs+8R740WVBEHumSEv3JZrPE3W8tJlH"; 
+//-----END CERTIFICATE-----
+
+// xxxxxxxxxx-private.pem.key
+const String privatePemKey = \
+//-----BEGIN RSA PRIVATE KEY-----
+"MIIEpAIBAAKCAQEA8AbcM8dgurCFGunl6sno2fbggYIbAwoZNTmYXZwEM+fBxN0A" \
+"DyRfvUS6FEGqE0znOHGaxaP7MCZd8wopPsum9F8XJxrUHBkfZtgEOYlvIhMkCeWN" \
+"HomHqU90Y+bS/Ha5pViYjazamNB5XIoeXkgAUmlMbOhVm3HLgR4OYMWGIOsQY2qn" \
+"MMQFFw2fIQ3V8Hu699K30KBcyuaMeQUTEdQIYJDBptaHCukWYqZejaAMp/mHbbVd" \
+"0L3XraQ7MKANxT6QvTRwAcPhq9g6ujSn1bsY/Bd4yFaJ4INOO0iymz8QJ3bqUuUL" \
+"NF91NaqOuZm0pWkXI1cJn08urdMMz+X3LSOYjQIDAQABAoIBAEQi7meUdZUJfv+A" \
+"3k+kOYGGX3zkHh7iwv0k+Ge6XkcNxyfHRLkHrlXgKKKPcWRBNHIFbdYlEq08dvcD" \
+"L2owDZjZVY04RHYle5CKSci7hty5akWU8FZ23BfoAjZJ1CLu4Qxa9hNhujwfEhR+" \
+"8Nf6wHykf5l66rJRv19L1PELoWO+SgRiAH6KGAZPLvGD5UX0uqIf+UOJNF0xAZll" \
+"9y3bbOL9Ib1GqSIfgUg36CuWQLWVTQQC1JT1e8genu0IniR5DuIEXievktzrb29c" \
+"dY+gemApPfH1+u0iX7tNe5o8b9Ljd82eXmIvn+qKWjv9for+pQrNCKOIGUllvFpG" \
+"HS0PAVECgYEA/k9iUXyknkaJ0SaHwQ9vb7tobbYRTJimqOSVNmyzKIsjexdj4xDz" \
+"aNssQkoAIorfVUFiGPJNJ2fEiJ44BJoXTGteaQIFONiVuykWEENj78ytlBMnqMTt" \
+"qdHRWhmd15/gjDDcSrYtnBkO3l9V0ARydhyf5hamVE6OQCXgcXHI1rcCgYEA8Z8t" \
+"pCGCqXb4+LyQAXqWYs9JRdE1guz5flrw+3iQS+cfYZubSIp9sdOHUKvJIwd/jCYN" \
+"d7sFEkfSgCiDEp7q5Q4I4jryMt0UpLyapNXnZfFU5Lf9xQxuHDcWC/Jo/qKDOyqX" \
+"QWS82uX5sJh3YKGpn/XmJv5iVUKa+JZkiEZxZtsCgYEA6TZbb2bif9MoJ4kyDTXe" \
+"d5RhW9sPWjLTAyc8PsDIO3H9g7AbhevRjGMR32iFXygDTue60i3B21Upwi92J6I3" \
+"o3kDB0E3EL5t8UjoVtm2F/6XX6eBQx/04zrqxbmgKlEPVwCnxEv036WLIRpEU5MA" \
+"dJgjeplixwWTJfiWLvKtv1kCgYEArNdCTfPOxS0fIse4d+ZaZ6qCbtgeYF7mhpXF" \
+"Zw4yoqldkHRAm56+FZQMaw/H3TAC9J1P6wM0uIP6N8VDJfHadCoa/sJN+Uae+s0U" \
+"DrAZTJpbMRXRCcE/jx10vu0UYHqeR5fLBXNriWcTu1kFpHFgptW/Yst8SiNQOl1S" \
+"4w0JGBsCgYBK2fz0rT8UaN4VSQAMa/j/Abx9bsCVSM6RTc095fKzXcLBS/1Q7xb8" \
+"W+6jIbUCFMoHEBbUvWCE/c8W+gxdWcr/ihPrTykM6PFAva6hfS5NRcQop2yv1LOj" \
+"zda4WVWGq8TDnYN/rjvs3KNhkoq0guqcslM29M54TAtO8vBFsHQoQA==";
+//-----END RSA PRIVATE KEY-----
+
+// This is the AWS IoT CA Certificate from: 
+// https://docs.aws.amazon.com/iot/latest/developerguide/managing-device-certs.html#server-authentication
+// This one in here is the 'RSA 2048 bit key: Amazon Root CA 1' which is valid 
+// until January 16, 2038 so unless it gets revoked you can leave this as is:
+const String caPemCrt = \
+//-----BEGIN CERTIFICATE-----
+"MIIDQTCCAimgAwIBAgITBmyfz5m/jAo54vB4ikPmljZbyjANBgkqhkiG9w0BAQsF" \
+"ADA5MQswCQYDVQQGEwJVUzEPMA0GA1UEChMGQW1hem9uMRkwFwYDVQQDExBBbWF6" \
+"b24gUm9vdCBDQSAxMB4XDTE1MDUyNjAwMDAwMFoXDTM4MDExNzAwMDAwMFowOTEL" \
+"MAkGA1UEBhMCVVMxDzANBgNVBAoTBkFtYXpvbjEZMBcGA1UEAxMQQW1hem9uIFJv" \
+"b3QgQ0EgMTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBALJ4gHHKeNXj" \
+"ca9HgFB0fW7Y14h29Jlo91ghYPl0hAEvrAIthtOgQ3pOsqTQNroBvo3bSMgHFzZM" \
+"9O6II8c+6zf1tRn4SWiw3te5djgdYZ6k/oI2peVKVuRF4fn9tBb6dNqcmzU5L/qw" \
+"IFAGbHrQgLKm+a/sRxmPUDgH3KKHOVj4utWp+UhnMJbulHheb4mjUcAwhmahRWa6" \
+"VOujw5H5SNz/0egwLX0tdHA114gk957EWW67c4cX8jJGKLhD+rcdqsq08p8kDi1L" \
+"93FcXmn/6pUCyziKrlA4b9v7LWIbxcceVOF34GfID5yHI9Y/QCB/IIDEgEw+OyQm" \
+"jgSubJrIqg0CAwEAAaNCMEAwDwYDVR0TAQH/BAUwAwEB/zAOBgNVHQ8BAf8EBAMC" \
+"AYYwHQYDVR0OBBYEFIQYzIU07LwMlJQuCFmcx7IQTgoIMA0GCSqGSIb3DQEBCwUA" \
+"A4IBAQCY8jdaQZChGsV2USggNiMOruYou6r4lK5IpDB/G/wkjUu0yKGX9rbxenDI" \
+"U5PMCCjjmCXPI6T53iHTfIUJrU6adTrCC2qJeHZERxhlbI1Bjjt/msv0tadQ1wUs" \
+"N+gDS63pYaACbvXy8MWy7Vu33PqUXHeeE6V/Uq2V8viTO96LXFvKWlJbYK8U90vv" \
+"o/ufQJVtMVT8QtPHRh8jrdkPSHCa2XV4cdFyQzR1bldZwgJcJmApzyMZFo6IQ6XU" \
+"5MsI+yMRQ+hDKXJioaldXgjUkK642M4UwtBV8ob2xJNDd2ZhwLnoQdeXeGADbkpy" \
+"rqXRfboQnoZsG4q5WTP468SQvvG5";
+//-----END CERTIFICATE-----
+
+WiFiClientSecure wiFiClient;
+void msgReceived(char* topic, byte* payload, unsigned int len);
+PubSubClient pubSubClient(awsEndpoint, 8883, msgReceived, wiFiClient); 
+
+void setup() {
+  Serial.begin(115200); Serial.println();
+  Serial.println("ESP8266 AWS IoT Example");
+
+  Serial.print("Connecting to "); Serial.print(ssid);
+  WiFi.begin(ssid, password);
+  WiFi.waitForConnectResult();
+  Serial.print(", WiFi connected, IP address: "); Serial.println(WiFi.localIP());
+
+  // get current time, otherwise certificates are flagged as expired
+  setCurrentTime();
+
+  uint8_t binaryCert[certificatePemCrt.length() * 3 / 4];
+  int len = b64decode(certificatePemCrt, binaryCert);
+  wiFiClient.setCertificate(binaryCert, len);
+  
+  uint8_t binaryPrivate[privatePemKey.length() * 3 / 4];
+  len = b64decode(privatePemKey, binaryPrivate);
+  wiFiClient.setPrivateKey(binaryPrivate, len);
+
+  uint8_t binaryCA[caPemCrt.length() * 3 / 4];
+  len = b64decode(caPemCrt, binaryCA);
+  wiFiClient.setCACert(binaryCA, len);
+}
+
+unsigned long lastPublish;
+int msgCount;
+
+void loop() {
+
+  pubSubCheckConnect();
+  
+  
+  //Add a JSON package of fake data to deliver to AWS IoT
+  //Uses snprintf but other viable options are: sprintf, strcpy, strncpy, or
+  //Use the ArduinoJson library for Efficient JSON serialization
+  char fakeData[100];
+  float t =  random(30,110); //fake number range, adjust as you like
+  float h =  random(40,100);
+  snprintf(fakeData, sizeof(fakeData),"{\"uptime\":%lu,\"temp\":%f,\"humid\":%f}", millis() / 1000, t, h);
+
+  if (millis() - lastPublish > 10000) {
+    String msg = String("Hello from ESP8266: ") + ++msgCount;
+    pubSubClient.publish("outTopic", msg.c_str());
+    Serial.print("Published: "); Serial.println(msg);
+    lastPublish = millis();
+  }
+}
+
+void msgReceived(char* topic, byte* payload, unsigned int length) {
+  Serial.print("Message received on "); Serial.print(topic); Serial.print(": ");
+  for (int i = 0; i < length; i++) {
+    Serial.print((char)payload[i]);
+  }
+  Serial.println();
+}
+
+void pubSubCheckConnect() {
+  if ( ! pubSubClient.connected()) {
+    Serial.print("PubSubClient connecting to: "); Serial.print(awsEndpoint);
+    while ( ! pubSubClient.connected()) {
+      Serial.print(".");
+      pubSubClient.connect("ESPthing");
+    }
+    Serial.println(" connected");
+    pubSubClient.subscribe("inTopic");
+  }
+  pubSubClient.loop();
+}
+
+int b64decode(String b64Text, uint8_t* output) {
+  base64_decodestate s;
+  base64_init_decodestate(&s);
+  int cnt = base64_decode_block(b64Text.c_str(), b64Text.length(), (char*)output, &s);
+  return cnt;
+}
+
+void setCurrentTime() {
+  configTime(3 * 3600, 0, "pool.ntp.org", "time.nist.gov");
+
+  Serial.print("Waiting for NTP time sync: ");
+  time_t now = time(nullptr);
+  while (now < 8 * 3600 * 2) {
+    delay(500);
+    Serial.print(".");
+    now = time(nullptr);
+  }
+  Serial.println("");
+  struct tm timeinfo;
+  gmtime_r(&now, &timeinfo);
+  Serial.print("Current time: "); Serial.print(asctime(&timeinfo));
+}