Request message format

subscrible

{
  "method": "subscribe", 
  "params": [
    "{topic}@{arg},{arg}", 
    "{topic}@{arg}"
  ], 
  "id": "{id}"    //call back ID
}

unsubscrible

{
  "method": "unsubscribe", 
  "params": [
    "{topic}@{arg},{arg}"
  ], 
  "id": "{id}"   //call back ID
}