Setup: Make Docker Compose, Scheduler, and Simclient fully operational

simclient/Dockerfile

@@ -0,0 +1,6 @@
+FROM python:3.13-slim
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+COPY . .
+CMD ["python", "simclient.py"]

simclient/requirements.txt

@@ -0,0 +1 @@
+paho-mqtt

simclient/simclient.py

@@ -0,0 +1,24 @@
+# simclient/simclient.py
+import time
+import paho.mqtt.client as mqtt
+
+
+def on_message(client, userdata, msg):
+    print(f"Empfangen: {msg.topic} {msg.payload.decode()}")
+
+
+def main():
+    client = mqtt.Client()
+    client.on_message = on_message
+    # Im Docker-Netzwerk: Hostname des MQTT-Brokers ist "mqtt"
+    client.connect("mqtt", 1883)
+    client.subscribe("infoscreen/+/now")
+    while True:
+        # Heartbeat senden
+        client.publish("infoscreen/client1/heartbeat", "alive")
+        client.loop(timeout=1.0)
+        time.sleep(5)
+
+
+if __name__ == "__main__":
+    main()