# `Dev.StreamHandler`
[🔗](https://github.com/mcass19/bb_tui/blob/v0.3.0/dev/stream_handler.ex#L3)

Dev-only command that emits a high-rate burst of synthetic `JointState`
sensor messages on `[:sensor, :simulated]`, sweeping a joint through a
sine motion for ~2s at ~100Hz.

Its purpose is to make the dashboard's high-rate handling visible: the
joints panel animates smoothly because sensor-driven renders are
coalesced to ~30fps, while the event log shows a single debounced
`JointState` row per second instead of hundreds. Run it from the
Commands panel and watch the Events count stay calm while the joint
bar sweeps.

Mirrors `Dev.MoveHandler`'s publish pattern; the burst runs in the
command's own process (so the TUI keeps rendering), returning the state
machine to its initial operational state when done.

Goal shape: `%{joint: atom()}`.

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