{
  "type": "<string>",
  "text": "<string>",
  "voice_id": "<string>",
  "language": "<string>",
  "add_wav_header": true,
  "sample_rate": 123,
  "speed": 123,
  "request_id": "<string>"
}

{
  "type": "<string>",
  "connection_id": "<string>",
  "message": "<string>"
}

{
  "type": "<string>",
  "request_id": "<string>",
  "chunk_index": 123,
  "data": "<string>"
}

{
  "type": "<string>",
  "request_id": "<string>",
  "total_chunks": 123,
  "characters": 123
}

{
  "type": "<string>",
  "request_id": "<string>",
  "error": "<string>",
  "message": "<string>"
}