请求报文格式

订阅

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

取消订阅

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