106 lines
3.6 KiB
Python
106 lines
3.6 KiB
Python
#! /usr/bin/python3
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import time
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import sys
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from paho.mqtt import client as mqtt_client
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import os
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import serial
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MAXIMUM_COMMUNICATION_FAILURE=100
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# MQTT Settings
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mqtt_server=os.environ['MQTT_SERVER']
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mqtt_topic=os.environ['MQTT_TOPIC']
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# SERIAL Port
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serial_device=os.environ['SERIAL_DEVICE']
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# The callback for when a PUBLISH message is received from the server.
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def on_message(client, userdata, msg):
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print(msg.topic+" "+str(msg.payload))
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# Start mqtt
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client_id = f'python-fan-ctrl'
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client = mqtt_client.Client(mqtt_client.CallbackAPIVersion.VERSION2)
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client.on_message = on_message
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if (not (mqtt_server)):
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print("MQTT_SERVER is not set")
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if (not (mqtt_topic)):
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print("MQTT_TOPIC is not set")
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# Start MQTT Client
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client.connect(mqtt_server, 1883)
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client.loop_start()
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# Start Serial communication
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ser = serial.Serial(serial_device, 115200, timeout=1) # open serial port
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client.publish(mqtt_topic + "device", ser.name) # check which port was really used
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SerialCommunicationFailureCounter=0
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# Endless Loop
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while True:
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try:
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try:
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if (not (ser.is_open)):
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ser.open()
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continue
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except (serial.SerialException):
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client.publish(mqtt_topic + "exception", "serial reopen") # check which port was really used
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time.sleep(1.0)
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try:
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line = ser.readline() # read a '\n' terminated line
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except (serial.SerialException):
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SerialCommunicationFailureCounter = SerialCommunicationFailureCounter + 1
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client.publish(mqtt_topic + "serialcom/failure", str(SerialCommunicationFailureCounter))
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line=None
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if (SerialCommunicationFailureCounter > MAXIMUM_COMMUNICATION_FAILURE):
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raise serial.SerialException("device reports readiness / device disconnected " + str(MAXIMUM_COMMUNICATION_FAILURE) + " times")
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if (line):
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client.publish(mqtt_topic + "exception", "") # clear exception
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# convert byte array to string
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l = line.decode("utf-8")
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try:
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# Parse the controller information
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# e.g. : 22.00;0%;0RPM
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temperatur, percent, rpm = l.split(";")
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except (ValueError):
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# activate debug code
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temperatur = None
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percent = None
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rpm = None
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if ((temperatur) and (percent) and (rpm)):
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parseError=False
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temperatur = temperatur.strip()
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client.publish(mqtt_topic + "temperatur", str(temperatur))
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if (percent.endswith('/100')):
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client.publish(mqtt_topic + "target", str(percent[:-4]))
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else:
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client.publish(mqtt_topic + "debug", "target%% invalid:" + str(percent))
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parseError=True
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# remove new line for last element
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rpm = rpm.replace('\r','').replace('\n','')
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if (rpm.endswith('RPM')):
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client.publish(mqtt_topic + "rpm", str(rpm[:-3]))
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else:
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client.publish(mqtt_topic + "debug", "RPM invalid:" + str(rpm))
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parseError=True
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# cleanup debugging
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if (parseError == False):
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client.publish(mqtt_topic + "debug", None)
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else:
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client.publish(mqtt_topic + "debug", line) # line was invalid and could not be parsed
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else:
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time.sleep(0.2)
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except (KeyboardInterrupt, SystemExit):
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cleanAndExit()
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client.loop_stop()
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