OTA Deployment Guardian

Use this skill when a device is updated remotely and losing the update path would be expensive.

Resources

• references/ota-safe-sketch.md - minimum sketch-side OTA contract and guardrails
• references/discovery-and-network-ports.md - IDE, mDNS, IP reachability, and disappearing network port triage
• references/recovery-and-rollback.md - rollout safety, rollback, and last-resort recovery planning
• references/native-espidf-rollback.md - native app slots, boot acceptance, stopped-output acknowledgement and rollback-compatible NVS/calibration schemas
• ../../docs/board-support/uno-r4-family.md - Uno R4 Minima and Uno R4 WiFi board-family caveats

When to Use

Use this skill when the request involves:

• OTA uploads for ESP32, Nano ESP32, or Uno R4 WiFi
• network port appears briefly or disappears
• IDE can ping the device but cannot upload
• keeping a remote weather station or deployed board updateable
• avoiding self-bricking after an OTA deployment

Do not use this skill for ordinary bench USB uploads unless the user is clearly preparing for later OTA deployment.

Workflow

1. Confirm the board family:
   • Native ESP-IDF -> open references/native-espidf-rollback.md; build intake stays with embedded-build-workflow, not Arduino sketch instructions.
   • ESP32 or Nano ESP32 -> open references/ota-safe-sketch.md
   • Uno R4 WiFi -> also open ../../docs/board-support/uno-r4-family.md
2. Separate discovery failures from sketch failures:
   • ping works but network port disappears -> open references/discovery-and-network-ports.md
   • OTA works once, then disappears after the new sketch runs -> verify the new sketch still implements the OTA path in ota-safe-sketch.md
3. Before suggesting a rollout, check references/recovery-and-rollback.md for recovery path, rollback strategy, and what must stay available over USB.
4. Treat core-version changes as a possible variable when OTA previously worked and later became unreliable.

Security And Maintenance Boundary

Use the router's connected-device security reference for secrets, signed images, dependency versions, staged rollout, rollback, vulnerability response, and decommissioning. This skill's board-specific OTA procedures do not prove that the device has secure boot, authenticated updates, or a recoverable field deployment; verify those controls on the exact target.

Core Rules

• Never assume OTA remains available after a new sketch unless the sketch keeps the OTA path alive.
• Distinguish reachability from OTA discovery. Ping success does not prove the IDE can discover or upload.
• Keep at least one recovery path in reserve for high-cost remote devices.
• For Uno R4 WiFi, keep board-family caveats explicit. Its WiFi side is not the same operational model as a plain ESP32 board.

Verification

• Confirm the sketch still connects to the intended network and services the OTA path after boot.
• Confirm whether the failure is discovery-only, upload-only, or full device reachability loss.
• For remote deployments, confirm the rollback or physical recovery plan before recommending an update.
• If board or core versions changed recently, capture the exact versions before concluding the failure is in user code.

Integration

• Pair with arduino-cli-skill when the user needs command-line upload or port inspection.
• Pair with field-power-and-connectivity-triager when the OTA path fails only off USB or in field power conditions.
• Pair with error-message-explainer when the OTA sketch itself does not build.

Shared Output Contract

Use the shared Arduino skill contract: state assumptions, required tools and versions, implementation steps, tests/evidence by proof stage, known limitations, and recovery/security notes.