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03_MQTT_Mailboxsensor/03_MQTT_Mailboxsensor.ino

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+#include <ESP8266WiFi.h>
+#include <PubSubClient.h>
+
+const char* ssid = "WIFI NETWORK";
+const char* password = "WIFI PASSWORD";
+
+//MQTT Server
+const char* mqtt_server = "MQTT Server-IP";
+
+const int dataled = 0;
+
+WiFiClient espClient;
+PubSubClient client(espClient);
+
+void setup() {
+  pinMode(dataled, OUTPUT);
+  digitalWrite(dataled, LOW);
+
+  /*Serial.begin(115200);
+  Serial.println("MQTT Mailboxsensor");
+  Serial.println("Connecting WIFI");  //*/
+  
+  WiFi.mode(WIFI_STA);
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED){
+    delay(500);
+    //Serial.print(".");
+  }
+  //Serial.println("WiFi connected.");
+
+  client.setServer(mqtt_server, 1883);
+  client.connect("Mailboxsensor");
+
+  client.publish("briefkasten/sensor", "1");
+  
+  client.loop();
+
+  delay(1000);
+
+  //Serial.println("Starting Deep Sleep ...");
+  digitalWrite(dataled, HIGH);  
+  ESP.deepSleep(0); //Infinite Deep-Sleep
+}
+
+void loop() {
+}