Created the required files to setup systemd units for autostart.

systemd/dht-start-restart@.service

@@ -0,0 +1,20 @@
+# Unit file template for creating auto start and restart of python script for dht sensor.
+# Template should be in /etc/systemd/system/dht-start-restart@.service
+# Environment Variables for each instances should be at /etc/default/dht-start-restart@%i
+# Enable with `systemctl enable --now remote-tunnel@%i`
+# where %i is the name of the pimonitoring instance (e.g. pimonitoring1)
+#
+[Unit]
+Description=Start python script for DHT22 sensor on %I
+After=network.target
+
+[Service]
+User=pi
+EnvironmentFile=/etc/default/dht-start-restart@%i
+ExecStart=/usr/bin/python3 ${PATH_TO_FILE}
+RestartSec=15
+Restart=always
+KillMode=mixed
+
+[Install]
+WantedBy=multi-user.target