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/Connecting to AWS IoT is taking for ever with ESP32/

Connecting to AWS IoT is taking for ever with ESP32

0

I tried connecting to AWS IoT using ESP32 with DTH11 sensor. After uploading the sketch to ESP32 and watching Serial monitor, I can see it connecting to WiFi and then it is taking for ever to connect to AWS.

Here is the output:

19:13:50.257 -> rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
19:13:50.257 -> configsip: 0, SPIWP:0xee
19:13:50.257 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
19:13:50.290 -> mode:DIO, clock div:1
19:13:50.290 -> load:0x3fff0018,len:4
19:13:50.290 -> load:0x3fff001c,len:1216
19:13:50.290 -> ho 0 tail 12 room 4
19:13:50.290 -> load:0x40078000,len:10944
19:13:50.290 -> load:0x40080400,len:6388
19:13:50.290 -> entry 0x400806b4
19:13:50.689 -> Connecting to Wi-Fi
19:13:51.188 -> .....Connected to the WiFi network
19:13:53.182 -> Connecting to AWS IOT
19:13:53.581 -> ......................................................................................................................................................................................................

I ran openssl s_client -connect custom_endpoint.iot.aws-region.amazonaws.com:8443 -CAfile CA.pem -cert cert.pem -key privateKey.pem with downloaded certificates from AWS to confirm that are fine and the handshake is happening.

SSL handshake has read 5529 bytes and written 1609 bytes
Verification: OK

How could I debug further?

Here is the sketch I am using...

#include "secrets.h"
#include <WiFiClientSecure.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>
#include "WiFi.h"
 
#include "DHT.h"
#define DHTPIN 13     // Digital pin connected to the DHT sensor
#define DHTTYPE DHT11   // DHT 11
 
#define AWS_IOT_PUBLISH_TOPIC   "esp32/pub"
#define AWS_IOT_SUBSCRIBE_TOPIC "esp32/sub"
 
float h ;
float t;
 
DHT dht(DHTPIN, DHTTYPE);
 
WiFiClientSecure net = WiFiClientSecure();
PubSubClient client(net);
 
void connectAWS()
{
  WiFi.mode(WIFI_STA);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
 
  Serial.println("Connecting to Wi-Fi");
 
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected to the WiFi network");
 
  // Configure WiFiClientSecure to use the AWS IoT device credentials
  net.setCACert(AWS_CERT_CA);
  net.setCertificate(AWS_CERT_CRT);
  net.setPrivateKey(AWS_CERT_PRIVATE);
 
  // Connect to the MQTT broker on the AWS endpoint we defined earlier
  client.setServer(AWS_IOT_ENDPOINT, 8883);
 
  // Create a message handler
  client.setCallback(messageHandler);
 
  Serial.println("Connecting to AWS IOT");
 
  while (!client.connect(THINGNAME))
  {
    Serial.print(".");
    delay(100);
  }
 
  if (!client.connected())
  {
    Serial.println("AWS IoT Timeout!");
    return;
  }
 
  // Subscribe to a topic
  client.subscribe(AWS_IOT_SUBSCRIBE_TOPIC);
 
  Serial.println("AWS IoT Connected!");
}
 
void publishMessage()
{
  StaticJsonDocument<200> doc;
  doc["humidity"] = h;
  doc["temperature"] = t;
  char jsonBuffer[512];
  serializeJson(doc, jsonBuffer); // print to client
 
  client.publish(AWS_IOT_PUBLISH_TOPIC, jsonBuffer);
}
 
void messageHandler(char* topic, byte* payload, unsigned int length)
{
  Serial.print("incoming: ");
  Serial.println(topic);
 
  StaticJsonDocument<200> doc;
  deserializeJson(doc, payload);
  const char* message = doc["message"];
  Serial.println(message);
}
 
void setup()
{
  Serial.begin(115200);
  connectAWS();
  dht.begin();
}
 
void loop()
{
  h = dht.readHumidity();
  t = dht.readTemperature();
 
 
  if (isnan(h) || isnan(t) )  // Check if any reads failed and exit early (to try again).
  {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
 
  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.println(F("°C "));
 
  publishMessage();
  client.loop();
  delay(1000);
}

I have referred following url https://how2electronics.com/connecting-esp32-to-amazon-aws-iot-core-using-mqtt/

asked a month ago26 views
3 Answers
1

Finally working. I have followed the instructions in the following links to make it work. https://exploreembedded.com/wiki/AWS_IOT_with_Arduino_ESP32 https://exploreembedded.com/wiki/Secure_IOT_with_AWS_and_Hornbill_ESP32

answered a month ago
0
Accepted Answer
answered a month ago
0

I don't have a DTH11 sensor so I commented it out and tried it and it worked fine.

sketch_may27a.ino

#include "secrets.h"
#include <WiFiClientSecure.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>
#include "WiFi.h"
 
//#include "DHT.h"
//#define DHTPIN 14     // Digital pin connected to the DHT sensor
//#define DHTTYPE DHT11   // DHT 11
 
#define AWS_IOT_PUBLISH_TOPIC   "esp32/pub"
#define AWS_IOT_SUBSCRIBE_TOPIC "esp32/sub"
 
float h ;
float t;
 
//DHT dht(DHTPIN, DHTTYPE);
 
WiFiClientSecure net = WiFiClientSecure();
PubSubClient client(net);
 
void connectAWS()
{
  WiFi.mode(WIFI_STA);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
 
  Serial.println("Connecting to Wi-Fi");
 
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
 
  // Configure WiFiClientSecure to use the AWS IoT device credentials
  net.setCACert(AWS_CERT_CA);
  net.setCertificate(AWS_CERT_CRT);
  net.setPrivateKey(AWS_CERT_PRIVATE);
 
  // Connect to the MQTT broker on the AWS endpoint we defined earlier
  client.setServer(AWS_IOT_ENDPOINT, 8883);
 
  // Create a message handler
  client.setCallback(messageHandler);
 
  Serial.println("Connecting to AWS IOT");
 
  while (!client.connect(THINGNAME))
  {
    Serial.print(".");
    delay(100);
  }
 
  if (!client.connected())
  {
    Serial.println("AWS IoT Timeout!");
    return;
  }
 
  // Subscribe to a topic
  client.subscribe(AWS_IOT_SUBSCRIBE_TOPIC);
 
  Serial.println("AWS IoT Connected!");
}
 
void publishMessage()
{
  StaticJsonDocument<200> doc;
  doc["humidity"] = h;
  doc["temperature"] = t;
  char jsonBuffer[512];
  serializeJson(doc, jsonBuffer); // print to client
 
  client.publish(AWS_IOT_PUBLISH_TOPIC, jsonBuffer);
}
 
void messageHandler(char* topic, byte* payload, unsigned int length)
{
  Serial.print("incoming: ");
  Serial.println(topic);
 
  StaticJsonDocument<200> doc;
  deserializeJson(doc, payload);
  const char* message = doc["message"];
  Serial.println(message);
}
 
void setup()
{
  Serial.begin(115200);
  connectAWS();
//  dht.begin();
}
 
void loop()
{
  h = 100;//dht.readHumidity();
  t = 200;//dht.readTemperature();
 
 
  if (isnan(h) || isnan(t) )  // Check if any reads failed and exit early (to try again).
  {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
 
  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.println(F("°C "));
 
  publishMessage();
  client.loop();
  delay(1000);
}

Secrets.h

#include <pgmspace.h>
 
#define SECRET
#define THINGNAME "ESP32_DHT11"                         //change this
 
const char WIFI_SSID[] = "xxxxxxxxx";               //change this
const char WIFI_PASSWORD[] = "xxxxxxxxx";           //change this
const char AWS_IOT_ENDPOINT[] = "xxx.iot.ap-northeast-1.amazonaws.com";       //change this
 
// Amazon Root CA 1
static const char AWS_CERT_CA[] PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----
MIIDQTCCAimgAwIBAgITBmyfz5m/jAo54vB4ikPmljZbyjANBgkqhkiG9w0BAQsF
...
rqXRfboQnoZsG4q5WTP468SQvvG5
-----END CERTIFICATE-----
)EOF";
 
// Device Certificate                                               //change this
static const char AWS_CERT_CRT[] PROGMEM = R"KEY(
-----BEGIN CERTIFICATE-----
MIIDWTCCAkGgAwIBAgIUfWcbwQBaVl8RnCfJY4TO4UGscAYwDQYJKoZIhvcNAQEL
...
X/XquhMaID9XyciEeI4ZNevs8PZ+wZIsP95rCOdehNb9dQLV37r/gHJ6clEO
-----END CERTIFICATE-----
 
 
)KEY";
 
// Device Private Key                                               //change this
static const char AWS_CERT_PRIVATE[] PROGMEM = R"KEY(
-----BEGIN RSA PRIVATE KEY-----
MIIEowIBAAKCAQEAo+HePx9Rc3XVmJjB3DG0idyGSlN+X86LBpbEF/OZUyqKtm1E
...
OrHl2hsHks8F8cD+rE355q6viOZxkQp+egLbM6g6a+3e1bpsUQNw
-----END RSA PRIVATE KEY-----
 
 
)KEY";

I would be very happy if you could ACCEPTE ANSWER when you solve the problem😀😀😀

answered a month ago
  • Sure. Thanks for confirming that the code works. I will give it a try tomorrow again.

  • I have tried your code but I could not make it work. I was getting the same error.

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