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diagrams and simulation

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diagrams/readme.md
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# OTA diagrams
PlantUML sources accompany chapters 03–05. The diagrams describe the illustrative A/B design, not a required platform or partition table.
| View | Source | Preview |
|---|---|---|
| Roles and the server/device boundary | [PlantUML](plantuml/ota-architecture.puml) | [SVG](rendered/ota-architecture.svg) |
| Trial boot, confirmation and recovery | [PlantUML](plantuml/ab-trial-boot.puml) | [SVG](rendered/ab-trial-boot.svg) |
| Storage areas and access responsibilities | [PlantUML](plantuml/ab-storage-layout.puml) | [SVG](rendered/ab-storage-layout.svg) |
From the repository root, regenerate previews with a local PlantUML installation and Graphviz:
```sh
JAVA_TOOL_OPTIONS=-Djava.awt.headless=true plantuml -tsvg -o ../rendered diagrams/plantuml/*.puml
```
Keep sources and previews together when changing a diagram. No external rendering service is needed. State transitions assume valid durable records; these pictures do not establish power-loss safety. The [A/B simulation](../examples/simulations/ab-trial-boot/readme.md) explores the same logical transitions.