Sheller MQTT app configuration

mqtt_listener.py

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+import paho.mqtt.client as mqtt
+import serial
+import time
+
+
+class ShellerRPMDisplay:
+    mqtt_host = "172.22.112.94"
+
+    COM_PORTS = [ "/dev/ttyACM0", "/dev/ttyUSB0" ]
+    buffer = ""
+    def init(self):
+        self.drum = 0
+        self.paddle = 0
+        try:
+            self.serials = [
+                serial.Serial(
+                    self.COM_PORTS[1],
+                    9600,
+                    timeout=1,
+                    stopbits=serial.STOPBITS_ONE,
+                    bytesize=serial.EIGHTBITS
+                ),
+                serial.Serial(
+                    self.COM_PORTS[0],
+                    9600,
+                    timeout=1,
+                    stopbits=serial.STOPBITS_ONE,
+                    bytesize=serial.EIGHTBITS
+                )
+            ]
+            self.mqtt_inform()
+            for s in self.serials:
+                s.write(bytearray("@D1\r\n", encoding='ascii'))
+            return True
+        except Exception as e:
+            print(e)
+            time.sleep(1)
+            if hasattr(self, "serials"):
+                del self.serials
+            return False
+
+    def start(self):
+        self.isrunning = True
+        self.mqtt_inform()
+
+    def stop(self):
+        self.isrunning = False
+        if hasattr(self, "serials"):
+            try:
+                for serial in self.serials:
+                    serial.close()
+            except:
+                pass
+            del self.serials
+
+    def main(self):
+        while self.isrunning:
+            if not hasattr(self, "serials"):
+                self.init()
+            try:
+                for i, serial in enumerate(self.serials):
+                    if serial.in_waiting > 0:
+                        self.buffer += serial.read(serial.in_waiting).decode(
+                            "utf-8"
+                        )
+                        print(self.buffer)
+                        self.process_text(self.buffer[: self.buffer.index("\r")], i)
+                        self.buffer = ""
+            except Exception as e:
+                print(e)
+            time.sleep(1)
+
+    def mqtt_inform(self):
+        # Publish MQTT messages for Moisture Percentage
+        self.client = mqtt.Client()
+        self.client.connect(self.mqtt_host, 1883)
+        self.client.publish(
+            "homeassistant/sensor/sheller-paddle-rpm/config",
+            '{\
+                "name": "Paddle RPM", \
+                "state_topic": "homeassistant/sensor/sheller/state", \
+                "unit_of_measurement": "RPM", \
+                "value_template": "{{ value_json.paddle }}", \
+                "unique_id": "sheller-paddle-rpm", \
+                "device":{ \
+                    "identifiers": ["shelling-machine"], \
+                    "name": "Shelling Machine", \
+                    "manufacturer": "ME&E" \
+                } \
+            }', retain=True
+        )
+        self.client.publish(
+            "homeassistant/sensor/sheller-drum-rpm/config",
+            '{\
+                "name": "Drum RPM", \
+                "state_topic": "homeassistant/sensor/sheller/state", \
+                "unit_of_measurement": "RPM", \
+                "value_template": "{{ value_json.drum }}", \
+                "unique_id": "sheller-drum-rpm", \
+                "device":{ \
+                    "identifiers": ["shelling-machine"] \
+                } \
+            }', retain=True
+        )
+
+    def process_text(self, text, index):
+        print(text)
+        if index == 0:
+            self.paddle = text
+        elif index == 1:
+            self.drum = text
+
+        self.client.publish(
+            "homeassistant/sensor/sheller/state",
+            '{"paddle": "%s", "drum": "%s"}'
+            % (self.paddle, self.drum), retain=True
+        )
+
+if __name__ == "__main__":
+    obj = ShellerRPMDisplay()
+    obj.start()
+    obj.main()

mqtt_listener.service

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+[Unit]
+Description=MQTT Listener Service
+After=network.target
+
+[Service]
+ExecStart=/home/biqu/mqtt_start.sh
+WorkingDirectory=/home/biqu
+StandardOutput=inherit
+StandardError=inherit
+Restart=always
+User=biqu
+
+[Install]
+WantedBy=multi-user.target
+

mqtt_start.sh

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+#!/bin/bash
+
+# navigate to the directory of the script
+cd /home/biqu/screw_control/
+
+# activate the python environment, if you're using one
+# source /path_to_your_venv/bin/activate
+
+# run the script
+/usr/bin/python3 mqtt_listener.py