/* ESP32 HTTP IoT Server Example for Wokwi.com

  https://wokwi.com/projects/320964045035274834

  To test, you need the Wokwi IoT Gateway, as explained here:

  https://docs.wokwi.com/guides/esp32-wifi#the-private-gateway

  Then start the simulation, and open http://localhost:9080
  in another browser tab.

  Note that the IoT Gateway requires a Wokwi Club subscription.
  To purchase a Wokwi Club subscription, go to https://wokwi.com/club
*/
#include"WiFi.h"
#include <PubSubClient.h>
const char* mqttServer="broker.hivemq.com";
const char* ssid="Wokwi-Guest";
const char* password="";
int port=1883;
char clientid[50];
//#define SSID "Wokwi-Guest"
//#define PASSWORD ""
WiFiClient espClient;
PubSubClient client(espClient);
void setup(void) {
  //put your setup code here,to run once:
  Serial.begin(115200);
  Serial.println("Hello,ESP32!");
  Serial.print("Connecting to");
  Serial.println(ssid);
  wifiConnect();
  client.setServer(mqttServer,port);
  //client.setCallback(callback);
  }


void loop(){
  if(!client.connected())
  {
    mqttReconnect();
  }
  else
  {
    client.publish("esp32-pub","data received");
  }
  client.loop();
}
void wifiConnect()
{
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid,password);
  while(WiFi.status()!=WL_CONNECTED)
  {
    delay(500);
    Serial.println(",");
  }
} 
void mqttReconnect(){
  while(!client.connected()){
    Serial.print("Attempting MQTT connection...");
    long r=random(1000);
    sprintf(clientid,"fcs-clientid-%d",r);
    if(client.connect(clientid)){
      Serial.print(clientid);
      Serial.println("connected");
    }
    else{
      Serial.print("failed,rc=");
      Serial.print(client.state());
      Serial.println("try again in 5 seconds");
      delay(5000);
    }
  }
}