#! /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()