//Basiert auf https://www.heise.de/select/ct/2018/17/1534215254552977
//MQTT reconnect von https://randomnerdtutorials.com/esp32-mqtt-publish-subscribe-arduino-ide/
//ezButton Library https://github.com/ArduinoGetStarted/button
#include <Arduino.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <PubSubClient.h>
#include <ezButton.h>

const char* wifi_ssid = "HEIMNETZ";
const char* wifi_password = "PASSWORT";
const char *deviceName = "Klingel";

#define MQTT_USER "MQTTUSER"
#define MQTT_PASSWORD "MQTTPWD"

IPAddress mqttserver(192, 168, 178, 11);
WiFiClient espClient;
PubSubClient client(espClient);
ezButton button(12);

void setup()
{
  pinMode(ledPin, OUTPUT); // Button pressed - Kontrolle >> kann gelöscht werden
  
  Serial.begin(115200);
  Serial.println("Booting");
  button.setDebounceTime(200);
  
  WiFi.hostname(deviceName);
  WiFi.begin(wifi_ssid, wifi_password);
  WiFi.mode(WIFI_STA);

  while (WiFi.status() != WL_CONNECTED)
  {
    delay(50);
  }
  client.setServer(mqttserver, 1883);
  client.connect(deviceName,MQTT_USER,MQTT_PASSWORD);
  client.setKeepAlive(40);
  if (client.connected())
  {
    client.publish("klingel/status", "MQTT connected.");
  }
}

void reconnect()
{
  // Loop until we're reconnected
  while (!client.connected())
  {
    Serial.print("Attempting MQTT connection..."); // Attempt to connect
    if (client.connect(deviceName,MQTT_USER,MQTT_PASSWORD))
    {
      client.publish("klingel/status", "MQTT reconnected.");
    }    
    else
    {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds"); // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void loop()
{
  button.loop();
  //MQTT Reconnect
  if (!client.connected())
  {
    reconnect();
  }
  if (button.isPressed())
  {
    client.publish("klingel/klingel", "1");
    Serial.println("Button pressed");
  }
  if (button.isReleased())
  {
    client.publish("klingel/klingel", "0");
    Serial.println("Button released");
  }
}