Robot Bringup

You get patterns for layered service units that source workspaces correctly, ordered startup with health checks between hardware, drivers, perception, and application layers, udev rules for deterministic device naming, and watchdog monitoring. The examples show real systemd unit files with proper signal handling, environment file separation, and graceful shutdown sequences. It's aimed at Ubuntu with ROS2 Humble through Jazzy and assumes you've outgrown manually SSH-ing in to launch nodes. Useful for anyone moving a robot from lab prototype to something that needs to survive reboots and run unattended.