diff --git a/esp/main/main.ino b/esp/main/main.ino
new file mode 100644
index 0000000..97c64b3
--- /dev/null
+++ b/esp/main/main.ino
@@ -0,0 +1,25 @@
+#include <WiFi.h>
+#include <PubSubClient.h>
+
+// WiFi
+const char *ssid = "xxxxx"; // Enter your WiFi name
+const char *password = "xxxxx";  // Enter WiFi password
+
+// MQTT Broker
+const char *mqtt_broker = "";
+const char *topic = "reinhold/test";
+const int mqtt_port = 1883;
+const char *client_id = "m5-esp";
+
+Wifi.begin(ssid, password);
+
+client.setServer(mqtt_broker, mqtt_port);
+client.setCallback(callback);
+client.connect(client_id.c_str());
+
+
+void callback(char *topic, byte *payload, unsigned int length) {
+  for (int i = 0; i < length; i++) {
+    Serial.print((char) payload[i]);
+  }
+}
\ No newline at end of file