MQTT Communication established

mqttclient/Dockerfile

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+FROM python:3.9 
+# Add sourcecode files
+ADD fanATserial2mqtt.py /root/
+# handle dependencies
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir paho-mqtt pyserial
+CMD ["python", "/root/fanATserial2mqtt.py"] 
+# Or enter the name of your unique directory and parameter set.

mqttclient/fanATserial2mqtt.py

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+#! /usr/bin/python3
+import time
+import sys
+from paho.mqtt import client as mqtt_client
+import os
+mqtt_server=os.environ['MQTT_SERVER']
+mqtt_topic=os.environ['MQTT_TOPIC']
+
+# The callback for when a PUBLISH message is received from the server.
+def on_message(client, userdata, msg):
+    print(msg.topic+" "+str(msg.payload))
+
+
+# Start mqtt
+client_id = f'python-fan-ctrl'
+client = mqtt_client.Client(mqtt_client.CallbackAPIVersion.VERSION2)
+client.on_message = on_message
+
+if (not (mqtt_server)):
+    print("MQTT_SERVER is not set")
+
+if (not (mqtt_topic)):
+    print("MQTT_TOPIC is not set")
+
+client.connect(mqtt_server, 1883)
+val=0
+
+client.loop_start()
+
+# Endless Loop
+while True:
+    try:
+        client.publish(mqtt_topic + "val", val)
+
+        time.sleep(0.2)
+        val = val + 1
+
+    except (KeyboardInterrupt, SystemExit):
+        cleanAndExit()
+
+client.loop_stop()