LED and RPM can be controlled via Mqtt

mqttclient/fanATserial2mqtt.py

@@ -17,22 +17,33 @@ mqtt_topic=os.environ['MQTT_TOPIC']
 # SERIAL Port
 serial_device=os.environ['SERIAL_DEVICE']
 
-# Start mqtt
-client_id = f'python-fan-ctrl'
-client = mqtt_client.Client(mqtt_client.CallbackAPIVersion.VERSION2)
 # Start Serial communication
 ser = serial.Serial(serial_device, 115200, timeout=1)  # open serial port
 
 # The callback for when a PUBLISH message is received from the server.
 def on_message(client, userdata, msg):
+    payload = msg.payload.decode("utf-8")
+    if ((mqtt_topic + "cmd/rpm") == msg.topic):
+        if (ser.is_open):
+            command = "ollpef{:02x}".format(int(payload))
+            ser.write(command.encode('utf-8'))
+        else:
+            client.publish(mqtt_topic + "cmd/exception", "Serial Connection closed") # clear exception
+    elif ((mqtt_topic + "cmd/led") == msg.topic):
+        command = "ollpel" + payload
+        ser.write(command.encode('utf-8'))
+    else:
         print(msg.topic+" "+str(msg.payload))
 
 # Handle MQTT Commands
-def on_connect(mqttc, obj, flags, reason_code, properties):
+def on_connect(client, obj, flags, reason_code, properties):
     client.subscribe(mqtt_topic + "cmd/led")
     client.subscribe(mqtt_topic + "cmd/rpm")
     print("Connected: " + str(reason_code))
 
+# Start mqtt
+client_id = f'python-fan-ctrl'
+client = mqtt_client.Client(mqtt_client.CallbackAPIVersion.VERSION2)
 client.on_message = on_message
 client.on_connect = on_connect
 
@@ -91,13 +102,22 @@ try:
 
             if ((temperatur) and (percent) and (rpm)):
                 parseError=False
-                currentTemperatur = float(temperatur.strip())
+                try:
+                    currentTemperatur = float(temperatur)
+                except (ValueError):
+                    print("Temperatur Error: could not convert string to float:" + temperatur)
+                    currentTemperatur = lastTemperatur
                 if (abs(currentTemperatur - lastTemperatur) > TEMPERATUR_MIN_DIFFERENCE):
                     client.publish(mqtt_topic + "temperatur", str(currentTemperatur))
                     lastTemperatur = currentTemperatur
 
                 if (percent.endswith('/100')):
+                    try:
                         currentTarget = int(percent[:-4])
+                    except (ValueError):
+                        print("Percent Error: could not convert string to int:" + (percent[:-4]))
+                        currentTarget = lastTarget
+
                     if (abs(lastTarget - currentTarget) > TARGET_MIN_DIFFERENCE):
                         client.publish(mqtt_topic + "target", str(currentTarget))
                         lastTarget = currentTarget
@@ -108,7 +128,12 @@ try:
                 # remove new line for last element
                 rpm = rpm.replace('\r','').replace('\n','')
                 if (rpm.endswith('RPM')):
+                    try:
                         currentRPM = int(rpm[:-3])
+                    except (ValueError):
+                        print("RPM Error: could not convert string to int:" + (rpm[:-3]))
+                        currentRPM = lastRPM
+
                     if (abs(currentRPM-lastRPM) > RPM_MIN_DIFFERENCE):
                         client.publish(mqtt_topic + "rpm", str(currentRPM))
                         lastRPM = currentRPM