added freedavis.service for systemd

systemd/freedavis.service

@@ -0,0 +1,12 @@
+[Unit]
+ Description=Gather data from serial port and write them to InfluxDB
+ After=multiuser.target
+
+ [Service]
+  User=root
+  ExecStart=/usr/bin/python3 /root/freedavis/python/davis_etl.py
+  Restart=on-failure
+  RestartSec=60
+
+[Install]
+ WantedBy=multi-user.target