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

scheduler/Dockerfile

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

scheduler/requirements.txt

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+paho-mqtt
+sqlalchemy
+pymysql
+python-dotenv

scheduler/scheduler.py

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+# scheduler/scheduler.py
+import time
+import paho.mqtt.client as mqtt
+
+
+def main():
+    # Fix für die veraltete API - explizit callback_api_version setzen
+    client = mqtt.Client(callback_api_version=mqtt.CallbackAPIVersion.VERSION2)
+
+    # Im Docker-Netzwerk: Hostname des MQTT-Brokers ist "mqtt", nicht "localhost"
+    client.connect("mqtt", 1883)
+
+    while True:
+        # Hier später: Events aus DB lesen und MQTT-Nachricht senden
+        print("Scheduler läuft...")
+        time.sleep(10)
+
+
+if __name__ == "__main__":
+    main()