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MikroTik RouterOS CHR (Cloud Hosted Router) with QEMU. Use when: running RouterOS in QEMU, booting CHR images, debugging CHR boot failures, setting up VirtIO devices for RouterOS, choosing between SeaBIOS and UEFI boot, configuring QEMU port forwarding for RouterOS REST API, setting up inter-VM socket networking or host-side L2 capture of guest broadcasts (e.g. MNDP), or selecting QEMU acceleration (KVM/HVF/TCG).

MNDP (MikroTik Neighbor Discovery Protocol) wire format, behavior, and RouterOS /ip/neighbor integration. Use when: implementing MNDP discovery, parsing MNDP packets, working with /ip/neighbor, understanding WinBox device discovery, debugging why a router doesn't appear in neighbor lists, or when the user mentions MNDP, neighbor discovery, WinBox discovery, or /ip/neighbor.

MAC-Telnet protocol (MikroTik Layer-2 terminal/exec over UDP 20561) wire format, session handshake, and MD5 + MTWEI (EC-SRP) authentication. Use when: implementing or debugging a MAC-Telnet client/server, reaching a RouterOS device by MAC address without IP, parsing MAC-Telnet packets, understanding the WinBox-style L2 terminal, deciding between classic MD5 and modern MTWEI auth, or when the user mentions MAC-Telnet, mactelnet, mactelnetd, port 20561, or MTWEI/EC-SRP RouterOS login.

Operate ArvanCloud APIs, DNS records, Cloud Server/IaaS, Object Storage, VOD/Live, CDN/Security, and Let's Encrypt DNS-01 certificates via acme.sh dns_arvan.

Bringing up a complete ROS2 system on a robot's onboard computer: systemd services, launch file composition, ordered startup, and production monitoring. Use this skill when configuring a robot to start ROS2 nodes on boot, writing systemd unit files for ROS2 launch, composing layered launch files for full robot stacks, setting up watchdog monitoring, configuring udev rules for deterministic device naming, or debugging boot-time race conditions. Trigger whenever the user mentions robot bringup, robot startup, systemd for ROS2, ROS2 on boot, launch file composition, robot boot sequence, udev rules for cameras or serial ports, automatic restart for ROS2 nodes, network configuration for multi-machine ROS2, log rotation for robots, graceful shutdown of robot stacks, or SSH-based remote debugging. Also trigger for sourcing workspaces in systemd, ordered startup with health checks, or running ROS2 systems as long-running production services. Covers systemd on Ubuntu 22.04/24.04 with ROS2 Humble, Iron, and Jazzy.