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Add silence-based keepalive to WebsocketSTTService

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Adds opt-in keepalive_timeout and keepalive_interval params to
WebsocketSTTService. When enabled, a background task sends silent audio
(or a service-specific protocol message) when the connection has been
idle, preventing server-side timeout disconnects.

Subclasses override _send_keepalive(silence) to wrap the silence in
their wire format. The default sends raw PCM bytes.

Enables keepalive for ElevenLabs (10s), Gladia (20s), and Soniox (1s),
replacing their per-service custom keepalive tasks.
This commit is contained in:
Mark Backman
2026-02-10 14:54:21 -05:00
parent 2dd3e2f1e7
commit 2f5e61ac55
6 changed files with 174 additions and 70 deletions
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- Fixed WebSocket STT services (ElevenLabs, Cartesia, Gladia, Soniox) disconnecting due to idle timeout when no audio is being sent (e.g. when inactive behind a `ServiceSwitcher`). `WebsocketSTTService` now provides opt-in silence-based keepalive via `keepalive_timeout` and `keepalive_interval` parameters.