emqx/emqx v4.2.0

EMQ X 4.2.0 Released

on GitHub

EMQ X 4.2.0 is released now, it mainly includes the following changes:

Feature:

• Support the use of third-party languages to write extension plugins to access other non-MQTT protocols, and currently supports Java and Python two programming languages. Visit Read Me for more information
• Support hot upgrade between revisions
• A new telemetry function is added to collect information about the usage of EMQ X Broker to help us improve the product. This function is enabled by default and supports manual disabled. Visit EMQ X Telemetry for more telemetry related information.
• Support message flow control in the form of quotas

Enhancement:

• The rule engine supports the creation of subscriptions for MQTT bridges
• The rule engine supports a more powerful SQL syntax
• Plugins such as MySQL and PostgreSQL fully support IPv6, SSL/TLS
• Support CentOS 8, Ubuntu 20.04 operating system and ARM64 system architecture
• Webhook supports configuring custom HTTP headers
• A more friendly alarm mechanism, providing developers with HTTP API
• Optimize retained message performance

Change:

• Subsequent versions will no longer support Debian 8, Ubuntu 14.04 and Raspbian 8 operating systems
• The emqx-statsd plugin is officially renamed to emqx-prometheus
• Publish and subscribe support independent configuration of topic rewrite rules
• Allow users to configure whether to allow WebSocket messages to contain multiple MQTT messages to be compatible with some clients
• Adjust RPC port discovery strategy
• Incompatible changes: The API path provided by the emqx-auth-mnesia plugin has been adjusted to api/v4/mqtt_user and api/v4/mqtt_acl
• The emqx-auth-http plugin disables super user authentication requests by default
• emqx-bridge-mqtt disables bridge mode by default

Bug fixes:

• Fix the issue of abnormal memory growth caused by the topic metrics feature
• Fix the issue that the LwM2M plugin did not correctly obtain the protocol version
• Fix the issue that the command line interface cannot be used when running multiple emqx instances on one machine
• Fix the issue that Websocket connection does not support IPv6