code: public static String getSysBroadcastId() {
          if (sysBroadcastId == null) {
              sysBroadcastId = EnvUtil.getEnv() + NodeIdBean.splitter + "sys_broadcast" +
                      NodeIdBean.splitter + "xian";//这里临时兼容后台推送，以后去掉不再订阅广播
              LOG.info("广播topic = " + sysBroadcastId);
          }
          return sysBroadcastId;
      }
docs: 获取各自带环境因子的统一广播id列表
  
  @deprecated 已废弃mq广播