EasyIOT connection problem with PubSubClient

#define MQTT_VERSION_3_1

#define MQTT_VERSION_3_1_1

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

#define AP_SSID     "xxx"
#define AP_PASSWORD "xxx"  

const char* mqttUser = "yyy";
const char* mqttPass = "yyy";

// create MQTT object
const char* mqtt_server = "cloud.iot-playground.com";

#define DO_TOPIC        "/Sensor.Parameter1"

#define PIN_DO_1         D0  // DO pin1 
#define MODULE_ID_1     1


#define PIN_DO_2         D1  // DO pin2 
#define MODULE_ID_2     2


#define PIN_DO_3         D2  // DO pin3 
#define MODULE_ID_3     3


#define PIN_DO_4         D3  // DO pin4 
#define MODULE_ID_4     4

//MQTT myMqtt("", EIOT_CLOUD_ADDRESS, 1883);
WiFiClient espClient;
PubSubClient client(espClient);

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

  WiFi.mode(WIFI_STA);  
  WiFi.begin(AP_SSID, AP_PASSWORD);
 
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(AP_SSID);
    
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  };

  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  
  Serial.print("Settings of MQTT server..."); 
  Serial.println(mqtt_server);
  client.setServer(mqtt_server, 1883);
  

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

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

void reconnect() {
 
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection with ID: ");
    Serial.print(getClientId().c_str());
    // Attempt to connect

    if (client.connect(getClientId().c_str(), mqttUser, mqttPass)) {
      Serial.println(" -> connected");
      // ... and subscribe to topic
      client.subscribe("ledStatus");
    } else {
      Serial.print(" -> failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }

     
  }
}


String macToStr(const uint8_t* mac)
{
  String result;
  for (int i = 0; i < 6; ++i) {
    result += String(mac[i], 16);
    if (i < 5)
      result += ':';
  }
  return result;
}

String getClientId()
{
  //set client id
  // Generate client name based on MAC address and last 8 bits of microsecond counter
  String clientName;
  uint8_t mac[6];
  WiFi.macAddress(mac);
  clientName += macToStr(mac);
  clientName += "-";
  clientName += String(micros() & 0xff, 16);

  return clientName;
}