EMQX 采用商业源码许可证，加速 MQTT + AI 创新

broker 4.3.0 更新日志
2021-5-8

EMQ X 4.3.0 is released now, it mainly includes the following changes:

Features and Enhancement

Building

  • Support Erlang/OTP 23
  • The new installation package only supports macOS 10.14 and above
  • Project adjusted to umbrella structure
  • Support using Elixir to build plugins

Performance improvement

  • The underlying implementation of the multi-language extension function is changed from erlport to gRPC
  • Support routing table compression, reduce memory usage, enhance subscription performance, publishing performance will be slightly affected, so disable option is provided
  • Improve wildcard subscription performance
  • Improve processing performance when a large number of clients are offline

Security

  • Protect EMQ X Broker from cross-site WebSocket hijacking attacks
  • SSL supports verify and server_name_indication configuration
  • Support the configuration of the maximum length of the certificate chain and the password of the private key file
  • Use TLS v1.3 by default, TLS v1.3 configs has no effect if started on OTP 22
  • JWT authentication supports JWKS

Other

  • Added update resource functionality for rule engine
  • Rule engine SQL function supports conversion between unix timestamp and rfc3339 format time
  • Keep retrying the resources that failed to connect after the EMQ X Broker is started
  • Websocket listener supports selecting supported subprotocols from the subprotocols list
  • WebSocket connection supports obtaining real IP and Port
  • Support the default authentication method caching_sha2_password of MySQL 8.0
  • The starting point is randomly selected when the shared subscription distribution strategy is configured as round_robin
  • Shared subscription supports hash distribution of messages by source topic
  • Support import and export of Authentication & ACL information in Mnesia
  • Allow to use base64 encoded client certificate or MD5 value of client certificate as username or Client ID
  • MQTT listener restart from API/CLI
  • API/CLI to force evict ACL cache
  • Added observer_cli
  • Support cluster metrics for Prometheus
  • Redis sentinel mode supports SSL connection
  • Support single-line log output, and support rfc3339 time format
  • emqx_auth_clientid and emqx_auth_username are merged to emqx_auth_mnesia. Please refer to doc to export data from older versions, and import to v4.3
  • By default, docker only logs to console, set EMQX_LOG__TO=file to switch to file
  • Support Json format log
  • Support IPv6 auto probe
  • Environment variable override configuration files can be used for all distributions (previously only for docker)
  • Certificate upload from dashboard has been made available for open-source edition (previously only for enterprise edition)

Bugs Fix

MQTT Protocol

  • Fix the processing of MQTT heartbeat packets
  • Fix MQTT packet receiving count issue
  • Limit the maximum effective size of the flight window to 65535
  • The value of the Keep Alive field in the Dashboard is not synchronized when Server Keep Alive was in effect

Gateway

  • ACL configuration in CoAP connection does not take effect
  • CoAP clients using the same ClientID can access at the same time
  • The sleep mode of MQTT-SN is unavailable
  • The MQTT-SN gateway will discard DISCONNECT packets in sleep mode
  • The LwM2M gateway encodes and decodes numbers into unsigned integers

Resource

  • The MySQL authentication SSL/TLS connection function is not available
  • Fix Redis reconnection failure

Other Fixes

  • ekka_locker's memory may grow infinitely under extreme conditions
  • The max_inflight_size configuration item in the MQTT bridge function does not take effect
  • Fix the issue of inflight in MQTT bridge
  • Fixed the error of indicator statistics in the MQTT bridge function and the problem of multiple unit conversions in the retry_interval field
  • Incorrect calculation of alarm duration
  • The long Client ID cannot be tracked
  • The query client information may crash
  • The inconsistency between topic rewriting and ACL execution order when publishing and subscribing
  • The WebSocket connection cannot use the peer certificate as the username
  • The authentication data cannot be imported
  • EMQ X may fail to start in Docker
  • Fixed delayed connection process OOM kill
  • The MQTT-SN connection with Clean Session being false did not publish a will message when it was disconnected abnormally