Code for button

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

//The NODEMCU has a button on it - named FLASH - it is connected to D3:
#define  SWITCH_PIN  D3
#define buttonPin D7

int buttonState = 0;
int spamFix = 0;

// Update these with values suitable for your network.

const char* ssid = "DSB Free Wifi";
const char* password = "skridspader";

// for the in-class exercise, we'll use the public broker, but for the actual course project:
// set-up a private mqtt broker at cloudmqtt.com (see Canvas for a howto video)
//and uncomment / edit the following:      [ you also need to change the 'client.connect' part of the code below in the code ]

//const char *mqtt_server = "mXX.cloudmqtt.com";
//const int mqtt_port = 17323;
const char *mqtt_server = "m21.cloudmqtt.com";
const int mqtt_port = 14939;
const char *mqtt_user = "button1";
const char *mqtt_pass = "hejhejhej";


//see the actual function below - this is just a placeholder..
void callback(char* byteArraytopic, byte* byteArrayPayload, unsigned int length);

//Let's define some objects:
WiFiClient espClient;

//and the mqtt client:
PubSubClient client(mqtt_server,mqtt_port,callback,espClient);


//THIS IS THE CORE OF THE 'SUBSCRIBE'
//everytime something happens on the topics we've subscribed [down below in the code]; this function will be fired.

void callback(char* byteArraytopic, byte* byteArrayPayload, unsigned int length) {

// it has the 'topic' and the message 'payload'

//let's convert the topic name [the first array] to a string:
  String topic;
  topic=String(byteArraytopic);
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");

// let's convert the incoming message [which arrives as an array of characters] to a string:
  String payload;
  for (int i = 0; i < length; i++) {
    //Serial.print((char)payload[i]);
    payload+=(char)byteArrayPayload[i];
  }

  if (String(topic) == "groupsix/controller_online"){
    client.publish("groupsix/readyCheckBut1", "1");
  }
}

// Setup the wifi connection...
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(".");
  }

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


// A function to connect to the mqtt server, and reconnect if the connection breaks, wifi breaks, server problem etc..

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect:
    // if you are using cloudmqtt, uncomment the following line, and comment the one below...
      if (client.connect("but1","button1","hejhejhej")){  // make sure 'myclientID' is something unique, e.g. 'groupXX'
    //if (client.connect("myclientID")) { // make sure 'myclientID' is something unique, e.g. 'groupXX'

      Serial.println("connected");
      // Once connected, publish an announcement...
      client.publish("groupsix/readyCheckBut1", "1");
      // ... and resubscribe to all messages coming to the 'OLED' topic...

      client.subscribe("groupsix/#");

    } 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() {

  //NOTE: if the following line does not work - try changing the BUILTIN_LED to LED_BUILTIN
  //if still does not work - attach a real LED to e.g. pin D5..
  pinMode(BUILTIN_LED, OUTPUT);     // Initialize the BUILTIN_LED pin as an output

  pinMode(D3, INPUT_PULLUP);     // Initialize the on-board button [named FLASH] pin as an output

  pinMode(buttonPin, INPUT);

  Serial.begin(115200);
  setup_wifi(); // self-explanatory.. check the function to see what it does..
  client.setServer(mqtt_server, mqtt_port); // connect to the mqtt server at the specified port [defined at the top]

  // set the 'callback' function, which is defined above.
  // We tell our client to fire the 'callback' function everytime there is a new message on the subscribed topics
  client.setCallback(callback);

}


void loop() {

//if we're not connected to the mqtt broker:
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  Serial.println(buttonState);
  buttonState = digitalRead(buttonPin);

  if (buttonState==LOW){
    spamFix=0;
  }
  if (buttonState==HIGH){
    if (spamFix==0){
      client.publish("groupsix/b1p", "1");
      spamFix=1;
    }
  }
}