receiving lots of verbose in serial port using PubSubClient.h when connecting and publishing MQTT msg

Question

I've successfully made communication with MQTT broker (HiveMQ cloud) using the Arduino library PubSubClient.h in an esp8266 client.

However, I get a lot of annoying things in the serial console as shown below

12:10:36.856 - :rdi 31, 5

12:10:36.902 - :rd 26, 31, 5

12:10:36.902 - :rdi 26, 26

12:10:36.902 - :c0 26, 31

12:10:36.944 - :wr 126 0

12:10:36.944 - :wrc 126 126 0

12:10:36.977 - :ack 126

12:10:36.977 - Message published [esp8266_data]: {"deviceId":"NodeMCU","siteId":"My Demo Lab","humidity":21.21,"temperature":2151}

How do I stop receiving those wrc ack ....?

Here is my code

 #include <ESP8266WiFi.h>
 #else
 #include <WiFi.h>
#endif

#include <ArduinoJson.h>
#include <>
#include <WiFPubSubClient.hiClientSecure.h>


/**** LED Settings *******/
const int led = 5; //Set LED pin as GPIO5


/****** WiFi Connection Details *******/
const char* ssid = "xxxxx";
const char* password = "xxxxxx";

/******* MQTT Broker Connection Details *******/
const char* mqtt_server = "xxxxxxxxx.s2.eu.hivemq.cloud";
const char* mqtt_username = "xxxxxx";
const char* mqtt_password = "xxxxxx";

/**** Secure WiFi Connectivity Initialisation *****/
WiFiClientSecure espClient;

/**** MQTT Client Initialisation Using WiFi Connection *****/
PubSubClient client(espClient);

unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE (50)
char msg[MSG_BUFFER_SIZE];


const int mqtt_port =8883;



/****** root certificate *********/

static const char *root_ca PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----
MIIFazCCA1OgAwIBAgIRAIIQz7DSQONZRGPgu2OCiwAwDQYJKoZIhvcNAQELBQAw
more
emyPxgcYxn/eR44/KJ4EBs+lVDR3veyJm+kXQ99b21/+jh5Xos1AnX5iItreGCc=
-----END CERTIFICATE-----
)EOF";

/************* Connect to WiFi ***********/
void setup_wifi() {
  delay(10);
  Serial.print("\nConnecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  randomSeed(micros());
  Serial.println("\nWiFi connected\nIP address: ");
  Serial.println(WiFi.localIP());
}

/************* Connect to MQTT Broker ***********/
void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    String clientId = "ESP8266Client-";   // Create a random client ID
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str(), mqtt_username, mqtt_password)) {
      Serial.println("connected");

      client.subscribe("led_state");   // subscribe the topics here

    } else {
      //Serial.print("failed, rc=");
      //Serial.print(client.state());
      //Serial.println(" try again in 5 seconds");   // Wait 5 seconds before retrying
      delay(1000);
    }
  }
}

/***** Call back Method for Receiving MQTT messages and Switching LED ****/

void callback(char* topic, byte* payload, unsigned int length) {
  String incommingMessage = "";
  for (int i = 0; i < length; i++) incommingMessage+=(char)payload[i];

  Serial.println("Message arrived ["+String(topic)+"]"+incommingMessage);

  //--- check the incomming message
    if( strcmp(topic,"led_state") == 0){
     if (incommingMessage.equals("1")) digitalWrite(led, HIGH);   // Turn the LED on
     else digitalWrite(led, LOW);  // Turn the LED off
  }

}

/**** Method for Publishing MQTT Messages **********/
void publishMessage(const char* topic, String payload , boolean retained){
  if (client.publish(topic, payload.c_str(), false))
      Serial.println("Message published ["+String(topic)+"]: "+payload);
}


/**** Application Initialisation Function******/
void setup() {

  pinMode(led, OUTPUT); //set up LED
  Serial.begin(9600);
  while (!Serial) delay(1);
  setup_wifi();

  #ifdef ESP8266
    espClient.setInsecure();
  #else
    espClient.setCACert(root_ca);      // enable this line and the the "certificate" code for secure connection
  #endif

  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
}

/******** Main Function *************/
void loop() {

  if (!client.connected()) reconnect(); // check if client is connected
  client.loop();


  DynamicJsonDocument doc(1024);

  doc["deviceId"] = "NodeMCU";
  doc["siteId"] = "My Demo Lab";
  doc["humidity"] = 81.21;
  doc["temperature"] = 18.51;

  char mqtt_message[128];
  serializeJson(doc, mqtt_message);

  publishMessage("esp8266_data", mqtt_message, false);

  delay(10000);

}

thanks in advance

Ricardo