Tracking UDP connections to auto-stop services is not that easy, but doable

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A detailed guide for automatically stopping and starting a Hytale game server using systemd socket activation and a custom bash watchdog script. The solution tracks UDP datagram activity via /proc/net/snmp to detect idle periods, shutting down the server after 120 seconds of inactivity to pause world time. Includes complete systemd unit configurations and an extensive FAQ explaining design decisions around UDP connection tracking challenges, systemd service lifecycle management, and workarounds for connectionless protocol monitoring without root privileges.

A Tale of UDP tracking: Hytale server auto stop and start with systemd