# BeeOS Phase 4 Notes

## Completed in this phase

Phase 4 adds the first BeeOS Runtime API.

New core file:

```text
beeos/core/runtime_api.py
```

## New runtime concepts

- `BeeRuntime`
- `BeeRuntimeContext`
- `BeeDisplayAPI`
- `BeeStorageAPI`
- `RuntimeResult`

## Runtime API currently supports

- app lifecycle simulation
- `BeeApp(ctx).on_open()`
- `BeeApp(ctx).on_draw(display)`
- `main(ctx)` fallback
- script execution through `main(ctx)` or `run(ctx)`
- display command capture
- notifications through `ctx.notify(title, body)`
- package-local JSON storage
- permission checks through `ctx.has_permission(name)`
- simple system APIs:
  - battery percent
  - uptime
  - RAM usage
  - PSRAM usage
  - storage usage
  - CPU usage

## Not real sandboxing yet

This is a simulator runtime. It is not a security sandbox.

Actual watch firmware will need much stricter execution boundaries, especially for filesystem access, networking, Bluetooth, sensors, background services, plugin hooks, and permissions.

## Next possible phase

Phase 5 should probably add:

- app lifecycle sessions
- touch event delivery to apps
- package settings pages
- watch face runtime
- plugin hook registry
- basic permission approval screens