#include "WiFi.h"
#include <LiquidCrystal_I2C.h>
#include <PubSubClient.h>

LiquidCrystal_I2C lcd (0x27, 16,2);
char clientId[50];

WiFiClient espClient;
PubSubClient client(espClient);

String name;
String sys_name;
String processor;

void setup() {
  Serial.begin(115200);
  
  lcd.init ();
  lcd.backlight ();
  WiFi.mode(WIFI_STA);
  WiFi.begin("Wokwi-GUEST", "");
  
  client.setServer("broker.emqx.io", 1883);
  client.setCallback(callback);
  
}


void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect(clientId)) {
      Serial.println(" connected");
      client.subscribe("topicName/weather");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void callback(char* topic, byte* message, unsigned int length) {
    
  
  String stMessage;
  
  for (int i = 0; i < length; i++) {
    stMessage += (char)message[i];
    
  }

  Serial.println(stMessage);

  
        lcd.clear();
        lcd.setCursor (0, 0);
        lcd.print(stMessage);
        lcd.clear();
        lcd.setCursor (0, 0);
        lcd.print(stMessage);
        lcd.clear();
        lcd.setCursor (0, 0);
        lcd.print(stMessage);

}

void loop() {
  
    if (!client.connected()) {
    mqttReconnect();
  }
  client.loop();

}