{
  "type": "start",
  "language": "en",
  "sample_rate": 16000
}

{
  "type": "stop"
}

{
  "type": "transcription",
  "is_final": true,
  "alternatives": [
    {
      "confidence": 0.95,
      "transcript": "Hello world"
    }
  ],
  "language": "en"
}

{
  "type": "error",
  "error": "config_error",
  "message": "Invalid language code"
}