Replace the ENV variable with a config file

So it's safer to configure, as we don't need to pass env variables
to a docker run service. Also it's easier to configure without
needing to pass a whole lot of env vars.

solaredge_modbus_mqtt.py

@@ -7,38 +7,34 @@ import solaredge_modbus
 import sys
 import time
 import paho.mqtt.client as mqtt
+import yaml
 from solaredge_modbus_mqtt import SolarData
 from pymodbus.exceptions import ConnectionException
 
 if __name__ == "__main__":
     argparser = argparse.ArgumentParser()
-    argparser.add_argument("--modbus-host", type=str, default=os.environ.get('MODBUS_HOST', '127.0.0.1'), help="ModbusTCP address")
-    argparser.add_argument("--modbus-port", type=int, default=os.environ.get('MODBUS_PORT', 1502), help="ModbusTCP port")
-    argparser.add_argument("--modbus-timeout", type=int, default=os.environ.get('MODBUS_TIMEOUT', 1), help="Connection timeout")
-    argparser.add_argument("--modbus-unit", type=int, default=os.environ.get('MODBUS_UNIT', 1), help="Modbus unit")
-
-    argparser.add_argument("--mqtt-host", type=str, default=os.environ.get('MQTT_HOST', '127.0.0.1'), help="MQTT Host")
-    argparser.add_argument("--mqtt-port", type=int, default=os.environ.get('MQTT_PORT', 1883), help="MQTT port")
-    argparser.add_argument("--mqtt-user", type=str, default=os.environ.get('MQTT_USER', None), help="MQTT Username")
-    argparser.add_argument("--mqtt-pass", type=str, default=os.environ.get('MQTT_PASS', None), help="MQTT Password")
-
-    argparser.add_argument("--poll-interval", type=int, default=os.environ.get('POLL_INTERVAL', 3), help="Waiting time between each poll")
-
+    argparser.add_argument("--config", type=str, default=os.environ.get('CONFIG_FILE', 'config.yaml'), help="Path to the config.yaml")
     args = argparser.parse_args()
 
+    with open(args.config, 'r') as stream:
+        try:
+            config = yaml.safe_load(stream)
+        except yaml.YAMLError as exc:
+            print(exc)    
+
     try:
         mqtt = mqtt.Client(client_id="", clean_session=True, userdata=None, protocol=mqtt.MQTTv311, transport="tcp")
-        mqtt.username_pw_set(args.mqtt_user, args.mqtt_pass)
-        mqtt.connect(args.mqtt_host, args.mqtt_port, 60)
+        mqtt.username_pw_set(config['mqtt']['user'], config['mqtt']['pass'])
+        mqtt.connect(config['mqtt']['host'], config['mqtt']['port'], 60)
     except OSError as err:
-        print("Cannot connect to MQTT on {0}:{1}, error: {2}".format(args.mqtt_host, args.mqtt_port, err))
+        print("Cannot connect to MQTT on {0}:{1}, error: {2}".format(config['mqtt']['host'], config['mqtt']['port'], err))
         sys.exit(1)
 
     inverter = solaredge_modbus.Inverter(
-        host=args.modbus_host,
-        port=args.modbus_port,
-        timeout=args.modbus_timeout,
-        unit=args.modbus_unit
+        host=config['modbus']['host'],
+        port=config['modbus']['port'],
+        timeout=config['modbus']['timeout'],
+        unit=config['modbus']['unit']
     )
 
     run = True
@@ -47,7 +43,7 @@ if __name__ == "__main__":
         try:
             solar_data = SolarData(inverter.read_all())
         except ConnectionException as err:
-            print("Cannot connect to SolarEdge Modbus server on {0}:{1}, error: {2}".format(args.modbus_host, args.modbus_port, err))
+            print("Cannot connect to SolarEdge Modbus server on {0}:{1}, error: {2}".format(config['modbus']['host'], config['modbus']['port'], err))
             sys.exit(2)
 
         mqtt.loop()