====== 11.3 Node Command Topic ======

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The [[dido:99_annexes:annex-b-terms-and-definitions:n:node|Node]] Command Topic carries simple operational commands to Phase 0 Nodes. It allows the team to demonstrate basic runtime coordination without introducing a full orchestration framework.

The recommended topic name is:

<code>
Control.Node.Command
</code>

A Node Command message should identify:

  - Command identity.
  - Command type.
  - Target Node, target Node Role, or broadcast target.
  - Timestamp.
  - Issuer or source, where applicable.
  - Correlation identifier, where needed.
  - Command parameters, where needed.
  - Expiry or timeout, where needed.

Phase 0 may support command types such as:

  - Start.
  - Pause.
  - Resume.
  - Restart.
  - ReportStatus.
  - Stop.

The team should define which commands each Node supports. A Node should reject unsupported commands clearly and should report the rejection through logs, status messages, command acknowledgements, or test Evidence as appropriate.

The Node Command Topic should not become a substitute for security, orchestration, scheduling, or policy enforcement. Phase 0 command handling should remain simple and should prove only that Nodes can receive, validate, act on, or reject controlled instructions.

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