{
   "id":"clientID11",
   "event":"subscribe",
   "success":true,
   "ts":1682242408023
}

{
   "topic":"announcement",
   "ts":1682242806000,
   "data": {
        "announcement_id": 1,
        "message": "Position information is incorrect due to a 1-minute delay.", 
        "url": null
      }
}
Push interval: on new announcement 
{
    "id": "clientID11",
    "topic": "announcement",
    "event": "subscribe"
}
Parameters
NameTypeRequiredDescription
idstringYid generate by client
eventstringYsubscribe/unsubscribe
topicstringNannouncement
{
   "id":"clientID11",
   "event":"subscribe",
   "success":true,
   "ts":1682242408023
}

{
   "topic":"announcement",
   "ts":1682242806000,
   "data": {
        "announcement_id": 1,
        "message": "Position information is incorrect due to a 1-minute delay.", 
        "url": null
      }
}