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

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

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

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

{
  "ch": "ticker",
  "ts": 1767225600000,
  "sq": 1234567890,
  "data": {
    "mrk": "100.00",
    "idx": "100.00",
    "oi": "10.00",
    "fr": "0.0001",
    "mid": "100.00"
  }
}