MQTT/ESP8266/I2C

[yasin35p]

Hello, 

I established a connection from my ESP8266 to the Labview Broker, but when I connect and subscribe to the topic, I receive the error message:

b:Serializer.FlattenedString.lvclass:unmarshalling.vi:3430001->OpenSerializer.lvlib:Serializer.lvclass:UnMarshall.vi:4390003->OpenSerializer.lvlib:Serializer.lvclass:UnMarshall (binary).vi:6550002->MQTT Base.lvlib:MQTT_Base.lvclass:Decode Publish Package.vi:2830001->MQTT Client.lvlib:Client.lvclass:Decode Application   

Code from my ESP->

#include <Wire.h>
#include <Adafruit_SHT31.h>
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <SPI.h>

// Replace with your WiFi credentials
const char* ssid = "1234";
const char* password = "1234";

// Replace with your MQTT broker details
const char* mqtt_server = "123";
const int mqtt_port = 1883;
const char* mqtt_topic = "sensor_data";

// Create an instance of the SHT85 sensor
Adafruit_SHT31 sht;

// Create an instance of the WiFi client
WiFiClient espClient;

// Create an instance of the MQTT client
PubSubClient client(espClient);

void setup() {
  // Start the serial communication
  Serial.begin(9600);

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Connect to MQTT broker
  client.setServer(mqtt_server, mqtt_port);

  // Initialize the SHT85 sensor
  if (!sht.begin(0x44)) {
    Serial.println("SHT85 not found. Check wiring!");
    while (1);
  }
}

void loop() {
  // Read sensor data
  float temperature = sht.readTemperature();
  float humidity = sht.readHumidity();

  // Print sensor data to Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  // Publish sensor data to MQTT
  if (client.connect("ESP8266Client")) {
    char tempStr[10];
    char humStr[10];
    dtostrf(temperature, 4, 2, tempStr);
    dtostrf(humidity, 4, 2, humStr);

    client.publish(mqtt_topic, tempStr);
    //client.publish(mqtt_topic, humStr);

    client.disconnect();
  }

  // Wait for a while before reading the sensor again
  delay(2000);
}

I have included all the information you need to know in this zip file.

Thanks for your support!