'ESP8266 not connected in Azure Iot Hub, return state -2

I'm trying to connect my ESP8266 to Azure Hub IoT, but I'm not getting it. I've already followed examples and I get the return rc = -2.

I use https://github.com/knolleary/pubsubclient libary.

I used the library example and other examples and nothing being able to connect to Azure Hub IoT.

Error this line

client.connect(dispositivo, usuario_mqtt, senha_mqtt)

My code

#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>
#include <PubSubClient.h>

const char* nome_wifi = "M11";
const char* senha_wifi = "035954159";

const char* broker = "tiedt-tech-iot-hub.azure-devices.net";
const char* dispositivo = "esp-quarto";
const char* usuario_mqtt = "tiedt-tech-iot-hub.azure-devices.net/esp-quarto";
const char* senha_mqtt = "SharedAccessSignature sr=tiedt-tech-iot-hub.azure-devices.net%2Fdevices%2Fesp-quarto&sig=uM6iZTBylAcNHa4%2F4GYxPcAwMUfMAljCx5zvHyx3m%2BE%3D&se=1647197049";
const char* topico = "devices/esp-quarto/messages/events/";

WiFiClientSecure espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(115200);
  conectarWifi();
}

void conectarWifi(){
  Serial.print("Conectando na rede");
  WiFi.begin(nome_wifi, senha_wifi);

  while(WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }

  Serial.println("");
  Serial.println("WiFi Conectado");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());  
}

void conectarMQTT() {
  Serial.println("Conectando no broker");
  client.setServer(broker, 8883);

  while(!client.connected()) {
    if (client.connect(dispositivo, usuario_mqtt, senha_mqtt)){
      Serial.println("Conectado no broker");  
    }
    else {
      Serial.print("Falha na conexão com o broker, rc= ");
      Serial.print(client.state());            
      Serial.println("");            
      delay(5000);
    }
  }  
}

void loop(){
  if (!client.connected()){
    conectarMQTT();  
  }
}
azureiotesp8266azure-iot-hub


Solution 1:[1]

Since late last year, there is an official Arduino SDK for ESP8266 boards. You can find it here, it comes with an example that I can confirm works.

It takes care of some of the heavy lifting, and uses the same WifiClientSecure and PubSubClient classes of your implementation.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Matthijs van der Veer

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