First commit

system2mqtt.service

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+[Unit]
+Description=System2MQTT - System Metrics to Home Assistant via MQTT
+After=network-online.target mosquitto.service
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=system2mqtt
+Group=system2mqtt
+SupplementaryGroups=adm systemd-journal
+WorkingDirectory=/opt/system2mqtt
+ExecStart=/opt/system2mqtt/run.sh
+Restart=always
+RestartSec=10
+StandardOutput=journal
+StandardError=journal
+
+# Environment can be overridden via drop-in or .env file
+EnvironmentFile=-/opt/system2mqtt/.env
+
+# Security hardening
+PrivateTmp=yes
+NoNewPrivileges=yes
+
+[Install]
+WantedBy=multi-user.target