emqx配置代理订阅无效

Question

emqx版本：4.1-beta.2

每次emqx一个大本版升级，之前的配置文件和api都会改动，因此该问题只针对上述版本

参照官网最新文档，按如下规则配置：

module.subscription = on
module.subscription.1.topic = cmd/%u/+/+/+/#
module.subscription.1.qos = 1
module.subscription.2.topic = rpc/%u/+/+/+/#
module.subscription.2.qos = 1
module.subscription.3.topic = m2m/%u/+/+
module.subscription.3.qos = 1

接在在服务器输入命令：emqx restart，服务器显示如下：

[root@wanli ~]# emqx restart
EMQ X Broker v4.1-beta.2 is stoped: ok
EMQ X Broker v4.1-beta.2 failed to start within 15 seconds,
see the output of '/usr/bin/emqx console' for more information.
If you want to wait longer, set the environment variable
WAIT_FOR_ERLANG to the number of seconds to wait.

输入/usr/bin/emqx console查看原因：

[root@wanli ~]# /usr/bin/emqx console
2020-05-11T09:52:06.888911+08:00 [error] You've tried to set module.subscription, but there is no setting with that name.
2020-05-11T09:52:06.889050+08:00 [error] Did you mean one of these?
2020-05-11T09:52:06.919048+08:00 [error] module.subscription.$id.nl
2020-05-11T09:52:06.919176+08:00 [error] module.subscription.$id.rh
2020-05-11T09:52:06.919255+08:00 [error] module.subscription.$id.qos
2020-05-11T09:52:06.941290+08:00 [error] Error generating con

可知emqx-4.1-beta.2已经不支持module.subscription = off | on配置，于是在emqx.conf文件中去掉module.subscription = on，接着重启emqx

[root@wanli ~]# emqx restart
Node 'emqx@127.0.0.1' not responding to pings.
EMQ X Broker v4.1-beta.2 is stoped:
EMQ X Broker v4.1-beta.2 is started successfully!

这下没问题了，用MQTTX客户端连接试一下：



由图可知，配置规则无效，按照官网文档，输入命令

[root@wanli ~]# emqx_ctl subscriptions list
[root@wanli ~]#

从结果可知，配置规则并未生效，在Dashboard界面看到一个Subscriptions选项卡，点开看看，有个emqx_mod_subscription配置，联想到module.subscription = on无效，于是启用该模块：

再次重启emqx

[root@wanli ~]# emqx restart
EMQ X Broker v4.1-beta.2 is stoped: ok
EMQ X Broker v4.1-beta.2 is started successfully!

并用mqttx客户端连接重试上述步骤，结果依旧无效。

问题：请问在emqx-4.1-beta.2如何配置代理订阅？？？