UniversalTelegramBot - Echo Bot

#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>
char ssid[] = "XXXXXXX";
char password[] = "XXXXX";
#define BOTtoken "XXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
WiFiClientSecure client;
UniversalTelegramBot bot(BOTtoken, client);
int Bot_mtbs = 1000;
long Bot_lasttime;

void setup() {
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);

  Serial.print("Connecting Wifi: ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  client.setInsecure();

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

void loop() {
  if (millis() > Bot_lasttime + Bot_mtbs)  {
    int numNewMessages = bot.getUpdates(bot.last_message_received + 1);
    while (numNewMessages) {
      Serial.println("got response");
      for (int i = 0; i < numNewMessages; i++) {
        Serial.println(bot.messages[i].text);
        bot.sendMessage(bot.messages[i].chat_id, bot.messages[i].text, "");
      }
      numNewMessages = bot.getUpdates(bot.last_message_received + 1);
    }
    Bot_lasttime = millis();
  }
}