Can't connect to my hiveq server from arduino using ESP8266

[mnasirbaloch]

Error Message:"failed rc=-2"

Code:
#include <DHT_U.h> // DHT library which uses some functions from Adafruit Sensor library
#include <ESP8266WiFi.h> // Library for using ESP8266 WiFi
#include <WiFiClientSecure.h> // Library for secure WiFi connections
#include <PubSubClient.h> // MQTT library
#include <LittleFS.h> // LittleFS library for ESP8266

#define DHTPIN 4
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

// WiFi credentials
const char* ssid = "myWifiSSID";
const char* password = "myWifiCode";

// MQTT broker information
const char* mqtt_server = "myHiveQ.cloud";
const int mqtt_port = 8883;
const char* mqtt_username = "devwithmnasir2";
const char* mqtt_password = "Devwithmnasir123@";

WiFiClientSecure espClient;
PubSubClient client(espClient);

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

// Initialize LittleFS
if (!LittleFS.begin()) {
Serial.println("Failed to mount file system");
return;
}

// Connect to WiFi
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("WiFi connected");

// Load CA certificate from LittleFS
File ca = LittleFS.open("/data/certs.ar", "r"); // Adjust path to match your setup
if (!ca) {
Serial.println("Failed to open CA file");
return;
}
if (!espClient.loadCACert(ca)) {
Serial.println("Failed to load CA certificate");
}
ca.close();

// Set secure connection for MQTT
espClient.setInsecure();
client.setServer(mqtt_server, mqtt_port);
}

void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Connecting to MQTT...");

// Generate a unique client ID
String clientId = "ESP8266Client-" + String(millis());

if (client.connect(clientId.c_str(), mqtt_username, mqtt_password)) {
Serial.println("connected");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
delay(2000);
}
}
}

void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();

// Read sensor data every 2 seconds
static unsigned long lastReadTime = 0;
if (millis() - lastReadTime > 2000) {
lastReadTime = millis();

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

if (isnan(h) || isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
return;
}

String payload = "Temperature: " + String(t) + " C, Humidity: " + String(h) + " %";
Serial.print("Publishing data: ");
Serial.println(payload);

client.publish("temprature_hum", payload.c_str());
}
}