# Tags

# Enterprise

• What's the major difference between EMQX enterprise and broker?
• Does EMQX provide consulting service?

# Update

• How to update EMQX license?

# Protocol

• Can EMQX support customized protocols? How to implement?

# Extends

• Can EMQX support customized protocols? How to implement?

# Resource estimation

• How to estimate resource usage of EMQX?

# Auth

• EMQX cannot connect to Mysql8.0

# WebHook

• Can I capture device online and offline events? How to use it?
• What's Hook? What's the use scenario?

# System Topic

• Can I capture device online and offline events? How to use it?
• What is the usage of system topics? What system topics are available?

# Message Queue

• What's mqueue? How to use mqueue in EMQX?

# WebSocket

• What's WebSocket? When to use Websocket to connect EMQX?

# ACL

• I want to control topics can be used for specific clients, how to configure it in EMQX?

# Pub/Sub

• What's shared subscription, and it's use scenario?

# Shared Subscription

• What's shared subscription, and it's use scenario?

# Rate Limit

• Can EMQX support traffic control?

# Retain

• What is off-line message?

# Subscription by Broker

• What is Subscription by Broker? And its use scenario?

# Performance

• When I was executing stress test, the connection number and throughput are lower than expected. How can I tune the system to make full use of it?
• My connections number is small, do I still need to deploy multiple nodes in production?
• Use of ssl resumption session in EMQX

# Persistence

• Can I forward MQTT messages EMQX to other MQTT broker, like RabbitMQ?

# REAT API

• Can I disconnect an MQTT connection from EMQX server?

# Dashboard

• Can I disconnect an MQTT connection from EMQX server?

# Kafka

• Can EMQX forward messages to Kafka?
• I use Kafka bridge in EMQX enterprise, when will the MQTT Ack packet sent back to client? Is the time when message arriving EMQX or after getting Ack message from Kafka?

# Bridge

• Can other MQTT broker (for example Mosquitto) forward messages to EMQX?

# Cluster

• Does EMQX support cluster auto discovery? What clustering methods are supported?

# RabbitMQ

• Can I forward MQTT messages EMQX to other MQTT broker, like RabbitMQ?

# Cloud

• Can I forward messages from EMQX to MQTT services hosted on public cloud?

# Mosquitto

• Can other MQTT broker (for example Mosquitto) forward messages to EMQX?

# Trace

• What should I do if I want trace the subscription and publish of some particular message?

# Debug

• When I was executing stress test, the connection number and throughput are lower than expected. How can I tune the system to make full use of it?
• How to troubleshoot if EMQX can't start after installation?

# TLS

• Does EMQX support encrypted connection? What is the recommended deployment?

# MySQL

• EMQX cannot connect to Mysql8.0

# Metrics

• MQTT client disconnect statistics