update example to work with the v1.3 library

examples/aws-mqtt-websocket-example-pubsubclient/aws-mqtt-websocket-example-pubsubclient.ino

@@ -1,6 +1,10 @@
+/**
+* Example working with library v1.3
+*
+*/
 #include <Arduino.h>
 #include <Stream.h>
-
+#include <time.h>
 #include <ESP8266WiFi.h>
 #include <ESP8266WiFiMulti.h>
 
@@ -35,6 +39,37 @@ char aws_region[]      = "eu-west-1";
 const char* aws_topic  = "$aws/things/your-device/shadow/update";
 int port = 443;
 
+//AWS root certificate - expires 2037
+const char ca[] PROGMEM = R"EOF(
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+)EOF";
+
 //MQTT config
 const int maxMQTTpackageSize = 512;
 const int maxMQTTMessageHandlers = 1;
@@ -72,9 +107,6 @@ void callback(char* topic, byte* payload, unsigned int length) {
 
 //connects to websocket layer and mqtt layer
 bool connect () {
-
-
-
     if (client.connected()) {    
         client.disconnect ();
     }  
@@ -120,7 +152,24 @@ void sendmessage () {
 }
 
 
-void setup() {
+void setClock() {
+  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));
+}
+
+void setup() {   
     wifi_set_sleep_type(NONE_SLEEP_T);
     Serial.begin (115200);
     delay (2000);
@@ -134,13 +183,19 @@ void setup() {
         Serial.print (".");
     }
     Serial.println ("\nconnected");
-
+
+    setClock(); // Required for X.509 certificate  validation
+
     //fill AWS parameters    
     awsWSclient.setAWSRegion(aws_region);
     awsWSclient.setAWSDomain(aws_endpoint);
     awsWSclient.setAWSKeyID(aws_key);
     awsWSclient.setAWSSecretKey(aws_secret);
     awsWSclient.setUseSSL(true);
+    awsWSclient.setCA(ca);
+    //as we had to configurate ntp time to validate the certificate, we can use it to validate aws connection as well
+    awsWSclient.setUseAmazonTimestamp(false);
+
 
     if (connect ()){
       subscribe ();