Controller to MQTT pipeline is working

mqttclient/fanATserial2mqtt.py

@@ -5,6 +5,8 @@ from paho.mqtt import client as mqtt_client
 import os
 import serial
 
+MAXIMUM_COMMUNICATION_FAILURE=100
+
 # MQTT Settings
 mqtt_server=os.environ['MQTT_SERVER']
 mqtt_topic=os.environ['MQTT_TOPIC']
@@ -27,24 +29,75 @@ if (not (mqtt_server)):
 if (not (mqtt_topic)):
     print("MQTT_TOPIC is not set")
 
+# Start MQTT Client
 client.connect(mqtt_server, 1883)
-val=0
-
 client.loop_start()
 
+# Start Serial communication
 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
+SerialCommunicationFailureCounter=0
 
 # Endless Loop
 while True:
     try:
-        client.publish(mqtt_topic + "val", val)
+        try:
+            if (not (ser.is_open)):
+                ser.open()
+                continue
+        except (serial.SerialException):
+            client.publish(mqtt_topic + "exception", "serial reopen") # check which port was really used
+            time.sleep(1.0)
 
-        time.sleep(0.2)
-        val = val + 1
+        try:
+            line = ser.readline()   # read a '\n' terminated line
+        except (serial.SerialException):
+            SerialCommunicationFailureCounter = SerialCommunicationFailureCounter + 1
+            client.publish(mqtt_topic + "serialcom/failure", str(SerialCommunicationFailureCounter))
+            line=None
+            if (SerialCommunicationFailureCounter > MAXIMUM_COMMUNICATION_FAILURE):
+                raise serial.SerialException("device reports readiness / device disconnected " + str(MAXIMUM_COMMUNICATION_FAILURE) + " times")
+
+        if (line):
+            client.publish(mqtt_topic + "exception", "") # clear exception
+            # convert byte array to string
+            l = line.decode("utf-8")
+            try:
+                # Parse the controller information
+                # e.g. : 22.00;0%;0RPM
+                temperatur, percent, rpm = l.split(";")
+            except (ValueError):
+                # activate debug code
+                temperatur = None
+                percent = None
+                rpm = None
+
+            if ((temperatur) and (percent) and (rpm)):
+                parseError=False
+                temperatur = temperatur.strip()
+                client.publish(mqtt_topic + "temperatur", str(temperatur))
+                if (percent.endswith('/100')):
+                    client.publish(mqtt_topic + "target", str(percent[:-4]))
+                else:
+                    client.publish(mqtt_topic + "debug", "target%% invalid:" + str(percent))
+                    parseError=True
+                
+                # remove new line for last element
+                rpm = rpm.replace('\r','').replace('\n','')
+                if (rpm.endswith('RPM')):
+                    client.publish(mqtt_topic + "rpm", str(rpm[:-3]))
+                else:
+                    client.publish(mqtt_topic + "debug", "RPM invalid:" + str(rpm))
+                    parseError=True
+
+                # cleanup debugging
+                if (parseError == False):
+                    client.publish(mqtt_topic + "debug", None)
+            else:
+                client.publish(mqtt_topic + "debug", line) # line was invalid and could not be parsed
+        else:
+            time.sleep(0.2)
 
     except (KeyboardInterrupt, SystemExit):
         cleanAndExit()

src/main.cpp

@@ -241,7 +241,7 @@ void loop()
   }
 
   Serial.print(fanSpeedPercent);
-  Serial.print("%;");
+  Serial.print("/100;");
   setFanSpeedPercent(fanSpeedPercent);
 
   Serial.print(actualFanSpeedRpm);