Improvements and driver stub for serial comms

deamons/serial.py

@@ -0,0 +1,41 @@
+import serial
+import logging
+import socket
+import asyncio
+import time
+import paho.mqtt.client as mqtt
+from asyncio_mqtt import Client
+
+MQTT_HOST = "127.0.0.1"
+MQTT_PORT = 1883
+
+
+async def mqtt_broker(ser):
+    async with Client(MQTT_HOST, port=MQTT_PORT) as client:
+        await client.subscribe("dcc/commands")
+        async with client.unfiltered_messages() as messages:
+            async for message in messages:
+                print(message.payload.decode())
+                ser.write(message.payload)
+
+
+def main():
+    client = mqtt.Client()
+    ser = serial.Serial('/dev/pts/7')
+    ser.baudrate = 9600
+    while True:
+        try:
+            client.connect(MQTT_HOST, MQTT_PORT)
+            break
+        except (socket.gaierror, ConnectionRefusedError):
+            logging.warning('Broker not available')
+            time.sleep(5)
+
+    logging.info('Broker subscribed')
+    client.disconnect()
+    asyncio.run(mqtt_broker(ser))
+    ser.close()
+
+
+if __name__ == "__main__":
+    main()