//Generated Date: Wed, 30 Oct 2024 08:07:16 GMT

int TempC = 0;
int Humi = 0;
#include <WiFi.h>
#include <PubSubClient.h>
#define MQTT_USER ""
#define MQTT_PASSWORD ""
#include <DHT.h>

char _lwifi_ssid[] = "Wokwi-GUEST";
char _lwifi_pass[] = "";
const char* mqtt_server = "broker.MQTTGO.io";
const unsigned int mqtt_port = 1883;
WiFiClient espClient;
PubSubClient mqtt_client(espClient);
String mqtt_data = "";

void mqtt_sendText(String topic, String text) {
    String clientId = "CN017";
    if (mqtt_client.connect(clientId.c_str(), MQTT_USER, MQTT_PASSWORD)) {
      mqtt_client.publish(topic.c_str(), text.c_str());
    }
}

void reconnect() {
  while (!mqtt_client.connected()) {
    String mqtt_clientId = "CN017";
    if (mqtt_client.connect(mqtt_clientId.c_str(), MQTT_USER, MQTT_PASSWORD)) {
      mqtt_client.subscribe("lhucin/D112IOT/cn017/ch02/tempc");
  mqtt_client.subscribe("lhucin/D112IOT/cn017/ch02/humi");
    } else {
      delay(5000);
    }
  }
}

DHT dht22_p12(12, DHT22);

void setup()
{
  Serial.begin(9600);

    randomSeed(micros());
  mqtt_client.setServer(mqtt_server,mqtt_port);
  mqtt_client.setCallback(callback);
  //mqtt_client.setBufferSize(1024);

  Serial.println("Wifi...");
  WiFi.disconnect();
  WiFi.softAPdisconnect(true);
  WiFi.mode(WIFI_STA);
  WiFi.begin(_lwifi_ssid, _lwifi_pass);
  while (WiFi.status() != WL_CONNECTED) { delay(500); }
  delay(300);
  Serial.println("MQTT...");
  Serial.println("MQTT OK");
  dht22_p12.begin();
  pinMode(4, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(15, OUTPUT);
}

void loop()
{
  TempC = dht22_p12.readTemperature();
  Humi = dht22_p12.readHumidity();
  if (TempC <= 28) {
    digitalWrite(4, HIGH);
    digitalWrite(2, LOW);
    digitalWrite(15, LOW);
  } else if (TempC <= 40) {
    digitalWrite(4, LOW);
    digitalWrite(2, HIGH);
    digitalWrite(15, LOW);
  } else {
    digitalWrite(4, LOW);
    digitalWrite(2, LOW);
    digitalWrite(15, HIGH);
  }
  mqtt_sendText("lhucin/D112IOT/cn017/ch02/tempc", String(TempC));
  mqtt_sendText("lhucin/D112IOT/cn017/ch02/humi", String(Humi));
  Serial.println((String("TempC:")+String(TempC)));
  Serial.println((String("Humi:")+String(Humi)));
  delay(2000);
}

void callback(char* topic, byte* payload, unsigned int length) {
  mqtt_data = "";
  for (int ci = 0; ci < length; ci++) {
    char c = payload[ci];
    mqtt_data+=c;
  }
}