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http://localhost:4000/faq/error.html

比如我部署了一个emq集群，我的backend也是一个集群，backend每个node订阅了同一个topic，如何保证一个消息只被一个node消费。如果中间加个kafka，那kafka只能订阅emq的其中一个节点，又涉及到单点问题。

http://localhost:4000/advanced/cluster.html

http://localhost:4000/advanced/http-api.html

http://localhost:4000/advanced/rest-api.html

http://localhost:4000/using-emqx/dashboard.html

http://localhost:4000/development/client.html

http://localhost:4000/advanced/plugins.html

请问emqtt的开源的协议是什么？可以商用吗?

http://localhost:4000/using-emqx/log.html

http://localhost:4000/tutorial/auth.html

http://localhost:4000/advanced/hooks.html

http://localhost:4000/advanced/acl.html

http://localhost:4000/

http://localhost:4000/advanced/auth.html

http://localhost:4000/advanced/shared-subscriptions.html

http://localhost:4000/faq/enterprise.html

http://localhost:4000/design/

1. 服务器端和客户端都按照官网配置

2. 客户端
   
   请教下，这种情况是我的客户端测试机哪里不对吗?

`[root@lp emqtt_benchmark]# erl
Erlang/OTP 18 [erts-7.2] [source] [64-bit] [smp:16:16] [async-threads:10] [hipe] [kernel-poll:false]

Eshell V7.2 (abort with ^G)
1> `

this new released doc has something confused about coap configuration. please refer to https://github.com/emqx/emqx-coap.

this doc gives us an example to use coap_client with post to send message, but the emqx-coap doc say that does not support POST and DELETE...

can you give some more clear description about how to use coaps protocol?

http://localhost:4000/advanced/auth.html

http://localhost:4000/using-emqx/config.html

http://localhost:4000/advanced/dely-publish.html

http://localhost:4000/faq/use-guide.html

http://localhost:4000/advanced/bridge.html

http://localhost:4000/configuration/

http://localhost:4000/using-emqx/directory.html

the same as en documents.
doc_url http://emqtt.com/docs/v2/index.html
pic_url http://emqtt.com/docs/v2/_images/emqtt.png

http://localhost:4000/advanced/rule-engine.html

http://localhost:4000/advanced/webhook.html

http://localhost:4000/faq/tags.html

http://localhost:4000/faq/deployment.html

http://localhost:4000/faq/

Refer to Clustered RabbitMQ on Kubernetes: https://www.kubernetes.org.cn/1304.html

http://localhost:4000/getting-started/start.html

http://localhost:4000/advanced/rule-examples.html

http://localhost:4000/advanced/retained.html

http://localhost:4000/advanced/cli.html

http://localhost:4000/introduction/checklist.html

http://localhost:4000/using-emqx/command-line.html

http://localhost:4000/advanced/proxy-subscriptions.html

http://localhost:4000/advanced/topic-rewrite.html

http://localhost:4000/advanced/system-topic.html

http://localhost:4000/getting-started/installation.html

http://localhost:4000/advanced/blacklist.html

http://localhost:4000/awesome/

http://localhost:4000/development/resource.html