Not able to connect ESP 8266 to Azure. Not able to authenticate. Please help!

Yash Paranjpay 0

Hello, I have followed all procedure to connect my ESP8266 and i have entered my credentials correctly. Why am I facing this issue? Have uploaded screenshot of the error. Kindly help!

ERROR: MQTT client connect attempt failed. Check host, deviceId, username and password. (state -2) Is connected ? NO (4) X - Error at connection.h:32 Error @ iotc_connect. Code 1

ERROR: Client was not connected.

Sander van de Velde | MVP 33,146 Reputation points MVP

2024-02-20T15:30:27.0166667+00:00

Hello @Yash Paranjpay, welcome to this moderated Azure community forum. Better questions with more information lead to better answers from our community members. Please provide information about the steps you have taken, the guide you follow, the code you use etc. Are you sure MQTT is allowed on your network and outbound firewall?

Yash Paranjpay 0

Hello Sander! It seems like the devices is connecting to the microsoft servers and the authentication process is at least going part way through. I have used this guide. : https://www.youtube.com/watch?v=v317rIfVJT0 This method has stopped working as of 11 October 2023 as seen in the comments section due to changes in Microsofts protocol. Alot of people are facing this issue since then. Kindly help. The Code I have used is :


#include <ESP8266WiFi.h>
#include "src/iotc/common/string_buffer.h"
#include "src/iotc/iotc.h"
#include "DHT.h"

#define DHTPIN 2

#define DHTTYPE DHT11   // DHT 11


#define WIFI_SSID "Mxxxi"
#define WIFI_PASSWORD "xxxxxxx"

const char* SCOPE_ID = "0xxxxxxxxxx1";
const char* DEVICE_ID = "xxxxxxxxxx";
const char* DEVICE_KEY = "xxxxxxx";
 
DHT dht(DHTPIN, DHTTYPE);

void on_event(IOTContext ctx, IOTCallbackInfo* callbackInfo);
#include "src/connection.h"

void on_event(IOTContext ctx, IOTCallbackInfo* callbackInfo) {
  // ConnectionStatus
  if (strcmp(callbackInfo->eventName, "ConnectionStatus") == 0) {
    LOG_VERBOSE("Is connected ? %s (%d)",
                callbackInfo->statusCode == IOTC_CONNECTION_OK ? "YES" : "NO",
                callbackInfo->statusCode);
    isConnected = callbackInfo->statusCode == IOTC_CONNECTION_OK;
    return;
  }

  // payload buffer doesn't have a null ending.
  // add null ending in another buffer before print
  AzureIOT::StringBuffer buffer;
  if (callbackInfo->payloadLength > 0) {
    buffer.initialize(callbackInfo->payload, callbackInfo->payloadLength);
  }

  LOG_VERBOSE("- [%s] event was received. Payload => %s\n",
              callbackInfo->eventName, buffer.getLength() ? *buffer : "EMPTY");

  if (strcmp(callbackInfo->eventName, "Command") == 0) {
    LOG_VERBOSE("- Command name was => %s\r\n", callbackInfo->tag);
  }
}

void setup() {
  Serial.begin(9600);

  connect_wifi(WIFI_SSID, WIFI_PASSWORD);
  connect_client(SCOPE_ID, DEVICE_ID, DEVICE_KEY);

  if (context != NULL) {
    lastTick = 0;  // set timer in the past to enable first telemetry a.s.a.p
  }
   dht.begin();
}

void loop() {

float h = dht.readHumidity();
float t = dht.readTemperature();

  
  if (isConnected) {

    unsigned long ms = millis();
    if (ms - lastTick > 10000) {  // send telemetry every 10 seconds
      char msg[64] = {0};
      int pos = 0, errorCode = 0;

      lastTick = ms;
      if (loopId++ % 2 == 0) {  // send telemetry
        pos = snprintf(msg, sizeof(msg) - 1, "{\"Temperature\": %f}",
                       t);
        errorCode = iotc_send_telemetry(context, msg, pos);
        
        pos = snprintf(msg, sizeof(msg) - 1, "{\"Humidity\":%f}",
                       h);
        errorCode = iotc_send_telemetry(context, msg, pos);
          
      } else {  // send property
        
      } 
  
      msg[pos] = 0;

      if (errorCode != 0) {
        LOG_ERROR("Sending message has failed with error code %d", errorCode);
      }
    }

    iotc_do_work(context);  // do background work for iotc
  } else {
    iotc_free_context(context);
    context = NULL;
    connect_client(SCOPE_ID, DEVICE_ID, DEVICE_KEY);
  }

}

Yash Paranjpay 0 Reputation points

2024-02-21T05:09:41.16+00:00

This is from serial monitor.
Yash Paranjpay 0 Reputation points

2024-02-21T05:14:15.15+00:00

When my credentials are incorrect, in any way. it gives a different error. in that case it usually gives a DPS PUT error or something similar to that.
Miguel Esteban Delgado Jiménez 0 Reputation points

2024-04-20T23:49:53.7733333+00:00

Hi bro, you can solve this problem? I have the same problem :c

1 answer

Sander van de Velde | MVP 33,146 Reputation points MVP

2024-02-21T07:24:01.29+00:00

Hello @Yash Paranjpay,

welcome to this moderated Azure community forum.

Last year, Microsoft finally replaced it's TLS certificate for encrypting the traffic with the IoT Hub.

Check out this blog post with more background information.

Because you are using an ESP, you are probably still pinning the old Baltimore certificate.

Can you check it the old Baltimore certificate is being used?

If so, replacing it with the new Digicert one is a simple solution. Check the link above for more information.

If the response helped, do "Accept Answer". If it doesn't work, please let us know the progress. All community members with similar issues will benefit by doing so. Your contribution is highly appreciated.
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Not able to connect ESP 8266 to Azure. Not able to authenticate. Please help!

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