#include <ESP8266WiFi.h>
#include <PubSubClient.h>

#define input 5
#define output 4

//Notwendige Daten zum Verbinden
char* ssid = your_ssid;
char* password = your_password;
char* mqttServer = your_mqttserver;
int mqttPort = 1883;
char* mqttUser = your_User;
char* mqttPassword = your_password;
char* topic = your_status_detection_topic;

WiFiClient espClient;
PubSubClient client(espClient);

int inputState;
int lastState;

char message[50];

void setup_wifi() {

  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  randomSeed(micros());

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

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();

  digitalWrite(output, HIGH);
  delay(500);
  digitalWrite(output, LOW);
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("ESP32Client", mqttUser, mqttPassword)) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      client.subscribe("pc/power");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void setup() {
  pinMode(BUILTIN_LED, OUTPUT);
  pinMode(input, INPUT);
  pinMode(output, OUTPUT);
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqttServer, 1883);
  client.setCallback(callback);
}

void loop() {

  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  inputState = digitalRead(input);
  if (inputState != lastState ) {
    if (inputState == 1) {
      client.publish(topic, "ON");
      Serial.println("posted");
      Serial.println(WiFi.status());
      Serial.println(client.connected());
    } else {
      client.publish(topic, "OFF");
      Serial.println("posted");
      Serial.println(WiFi.status());
      Serial.println(client.connected());
    }

  }
  lastState = inputState;
}