# `BB.TopologySupervisor`
[🔗](https://github.com/beam-bots/bb/blob/main/lib/bb/topology_supervisor.ex#L5)

Supervisor for all hardware-facing subsystems of a robot.

Groups the sensor, controller, and link supervisors so that the
hardware-facing tree has its own restart budget. When the budget is
exhausted this supervisor shuts down, signalling that hardware control
is unrecoverable. `BB.Safety.Controller` monitors this supervisor and
force-disarms the robot when it dies, leaving infrastructure processes
(registry, pubsub, runtime, bridges) running so external systems can
still observe the failure and call `BB.Safety.force_disarm/1`.

The restart budget is configurable via the `topology_max_restarts` and
`topology_max_seconds` settings on the robot DSL.

# `child_spec`

Returns a specification to start this module under a supervisor.

See `Supervisor`.

# `start_link`

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*Consult [api-reference.md](api-reference.md) for complete listing*