🔐 add EnvironmentFile to systemd service

.env.example

@@ -5,3 +5,4 @@ INFLUXDB_BUCKET="electricity"
 INFLUXDB_ENABLED=True
 FLASK_APP_URL="http://localhost/impulses"
 FLASK_APP_ENABLED=True
+SENSOR_PIN=27

powermeter.py

@@ -21,7 +21,7 @@ if os.getenv("INFLUXDB_ENABLED", False).lower() == "true":
     client = influxdb_client.InfluxDBClient(url=url, token=token, org=org)
     write_api = client.write_api(write_options=SYNCHRONOUS)
 
-SENSOR_PIN = 27
+SENSOR_PIN = os.environ.get("SENSOR_PIN")
 GPIO.setmode(GPIO.BCM)
 GPIO.setup(SENSOR_PIN, GPIO.IN)
 

powermeter.service

@@ -4,6 +4,7 @@ Description=PowerMeter Service
 [Service]
 Type=simple
 User=root
+EnvironmentFile=/etc/powermeter-environment
 ExecStart=/usr/local/bin/powermeter.py
 Restart=always
 RestartSec=30