#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <WiFiUdp.h>
#include <PubSubClient.h>

//Your MQTT Broker
const char* mqtt_server = "xxx";
const char* mqtt_user = "xxx";
const char* mqtt_passwd = "xxx";
const char* mqtt_topic = "Bewegung_01";
const char* mqtt_ClientID = "Bewegung01";

//Your Wifi SSID
const char* ssid = "xxx";
//Your Wifi Key
const char* password = "xxx";

ESP8266WebServer server(80);

WiFiClient espClient;
PubSubClient client(espClient);

int Input3 = 3; //the RX pin is the input!!!
int sensorValue3 = 0, oldValue3 = 0, tmp = 10, val = 0;
char msg[40];

void setup(void)
{
Serial.begin(115200);
Serial.println("");
//connect to WIFI
WiFi.persistent(false);
WiFi.mode(WIFI_OFF);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);

// Wait for WiFi
Serial.println("");
Serial.print("Connecting to: ");
Serial.println(ssid);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
if(tmp)
{
tmp--;
}
else
{
snprintf (msg, 40,"No connection to %s: ", ssid, " -> break");
Serial.println(msg);
break;
}
}
tmp = 10;
Serial.println("");
Serial.print("IP-Adress: ");
Serial.println(WiFi.localIP());
//connect to mqtt broker
client.setServer(mqtt_server, 1883);

while (!client.connected())
{
if (client.connect(mqtt_ClientID, mqtt_user, mqtt_passwd))
{
client.subscribe(mqtt_topic);
}
else
{
if(tmp)
{
Serial.print("*");
tmp--;
}
else
{
Serial.println("No connection to broker -> break");
break;
}
}
}

Serial.println("switching to motion dectector...");
delay(100);
pinMode(Input3, INPUT);
pinMode(2, OUTPUT);
}

void loop(void){
sensorValue3 = digitalRead(Input3);
if(sensorValue3 != oldValue3)
{
oldValue3 = sensorValue3;
if(tmp)
{
snprintf (msg, 40, "%s: %s", mqtt_ClientID, (sensorValue3 == 0) ? "0" : "1");
client.publish(mqtt_topic, msg);
}
else
{
digitalWrite(2,sensorValue3);
}
}
delay(100);
}