feat: add basic app that consumes mqtt uplinks from chirpstack

app/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 main.py .
+CMD ["python", "main.py"]

app/main.py

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+import paho.mqtt.client as mqtt
+import logging
+import sys
+
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s [%(levelname)s] %(message)s",
+    datefmt="%Y-%m-%dT%H:%M:%S",
+    stream=sys.stdout,   # Docker lit stdout par défaut
+    force=True
+)
+
+log = logging.getLogger(__name__)
+
+
+def on_connect(client, userdata, flags, reason_code, properties):
+    log.info(f"Connected with result code {reason_code}")
+    client.subscribe("application/+/device/+/event/up")
+
+def on_message(client, userdata, msg):
+    log.info(msg.topic+" "+str(msg.payload))
+
+
+if __name__ == "__main__":
+    mqttc = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2)
+    mqttc.on_connect = on_connect
+    mqttc.on_message = on_message
+
+    mqttc.connect("mosquitto", 1883, 60)
+    mqttc.loop_forever()

app/requirements.txt

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+paho-mqtt==v2.1.0