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#include <WiFi.h>
#include <PubSubClient.h>

#define uS_TO_S_FACTOR 1000000 /* Conversion factor for micro seconds to seconds /
#define TIME_TO_SLEEP 30 / Time ESP32 will go to sleep (in seconds) */

const char* ssid = "XXXXXXX";
const char* password = "XXXXXXXXX";
const char* mqttServer = "postman.cloudmqtt.com";
const int mqttPort = XXXXXXX;
const char* mqttUser = "XXXXXXXX";
const char* mqttPassword = "XXXXXXXXXXX";

String temp_str;
char temp[50];

WiFiClient espClient;
PubSubClient client(espClient);

void callback(char* topic, byte* payload, unsigned int length) {

Serial.print("Message arrived in topic: ");
Serial.println(topic);

Serial.print("Message:");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}

Serial.println();
Serial.println("-----------------------");

}

void setup() {
Serial.begin(115200);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.println("Connecting to WiFi..");
}
Serial.println("Connected to the WiFi network");

client.setServer(mqttServer, mqttPort);
client.setCallback(callback);

while (!client.connected()) {
Serial.println("Connecting to MQTT...");

if (client.connect("ESP32Client", mqttUser, mqttPassword,"lastwill",1,0,"Disconnect",0 )) 
{
   Serial.println("connected");  
 } else {

  Serial.print("failed with state ");
  Serial.print(client.state());
  delay(2000);
 }
}

client.subscribe("mytopic",1);

for(int i=0;i<100; i++)
{
client.loop(); //Ensure we've sent & received everything
delay(100);
}

Serial.print("Going to Sleep...");

esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
esp_deep_sleep_start();
}

void loop() {
}