FanLedCtrl/mqttclient/fanATserial2mqtt.py

#! /usr/bin/python3
import time
import sys
from paho.mqtt import client as mqtt_client
import os
import serial

# MQTT Settings
mqtt_server=os.environ['MQTT_SERVER']
mqtt_topic=os.environ['MQTT_TOPIC']
# SERIAL Port
serial_device=os.environ['SERIAL_DEVICE']

# 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()

ser = serial.Serial(serial_device, 115200, timeout=1)  # open serial port
client.publish(mqtt_topic + "device", ser.name) # check which port was really used

line = ser.readline()   # read a '\n' terminated line
client.publish(mqtt_topic + "debug", line) # check which port was really used

# 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()