{
  "req": "sub",
  "params": [
    "book"
  ]
}

{
  "req": "unsub",
  "params": [
    "book"
  ]
}

{
  "data": [
    {
      "ch": "ticker",
      "res": "ok",
      "er": "timeout"
    }
  ]
}

{
  "data": [
    {
      "ch": "ticker",
      "res": "ok",
      "er": "timeout"
    }
  ]
}

{
  "ch": "ticker",
  "ts": 1767225600000,
  "sq": 1234567890,
  "data": {
    "bids": [
      [
        "100.00",
        "10.00"
      ]
    ],
    "asks": [
      [
        "100.00",
        "10.00"
      ]
    ],
    "uts": 1767225600000,
    "sq": 1234567890
  }
}