EMQX Open Source Version 4

4.4.19

Release Date: 2023-06-27

Enhancements

Added support for TCP keep-alive in MQTT/TCP and MQTT/SSL listeners #10854.
A new configuration option has been added: zone.<zone-name>.tcp_keepalive = Idle,Interval,Probes. Users can enable the TCP layer's Keep Alive feature and specify time parameters using this configuration. This configuration is only effective on Linux and MacOS systems.

Improved error logs related to Proxy Protocol emqx/esockd#177.

The sample logs before this improvement:

2023-04-20T14:56:51.671735+08:00 [error] supervisor: 'esockd_connection_sup - <0.2537.0>', errorContext: connection_shutdown, reason: {invalid_proxy_info,<<"f\n">>}, offender: [{pid,<0.3192.0>},{name,connection},{mfargs,{...}}]

2023-04-20T14:57:01.348275+08:00 [error] supervisor: 'esockd_connection_sup - <0.2537.0>', errorContext: connection_shutdown, reason: {proxy_proto_timeout,5000}, offender: [{pid,<0.3194.0>},{name,connection},{mfargs,{...}}]

After the improvement:

2023-04-20T18:07:06.180134+08:00 [error] [esockd_proxy_protocol] The listener 127.0.0.1:8883 is working in proxy protocol mode, but received invalid proxy_protocol header, raw_bytes=<<"f\n">>

2023-04-20T18:10:17.205436+08:00 [error] [esockd_proxy_protocol] The listener 127.0.0.1:8883 is working in proxy protocol mode, but timed out while waiting for proxy_protocol header

Added a new feature to enable partial certificate chain validation for TLS listeners #10553.
For details please checkout the listener.ssl.external.partial_chain in the emqx.conf config file.
Added a new feature to enable client certificate extended key usage validation for TLS listeners #10669.
For details please checkout the listener.ssl.external.verify_peer_ext_key_usage in the emqx.conf config file.
Added the live_connections field in the HTTP API /api/v4/nodes response #10859.
Previously, this interface had a connections field, which represented the number of active connections on the current node that had not expired. This means that even if the MQTT connection has been disconnected, as long as the client has a persistent session, it would still be counted in the connections field. The newly added live_connections field specifically counts the number of clients with MQTT connections that have not been disconnected.
Added 3 random SQL functions to the rule engine #11113.
- random(): Generates a random number between 0 and 1 (0.0 =< X < 1.0).
- uuid_v4(): Generates a random UUID (version 4) string.
- uuid_v4_no_hyphen(): Generates a random UUID (version 4) string without hyphens.
Added numerical range validation (23-65535) for the mqtt.max_clientid_len configuration parameter #11096.

Bug fixes

Fixed an issue where the rule engine was unable to access variables exported by FOREACH in the DO clause #10620.
Given a payload: {"date": "2023-05-06", "array": ["a"]}, as well as the following SQL statement:
```
FOREACH payload.date as date, payload.array as elem
DO date, elem
FROM "t/#"
```
Prior to the fix, the date variable exported by FOREACH could not be accessed in the DO clause of the above SQL, resulting in the following output for the SQL statement: [{"elem": "a","date": "undefined"}]. After the fix, the output of the SQL statement is: [{"elem": "a","date": "2023-05-06"}]
Fixed the issue where the cache of rules failed to update in certain cases #11072.
Prior to the fix, after manually updating the rules, there could be instances where the cache update did not synchronize to certain nodes. This would result in inconsistent rule execution states across different nodes.
Fixed an issue where the WebHook plugin failed to execute the on_client_connack hook #10710.
See https://github.com/emqx/emqx/issues/10628 for more details.

4.4.18

Release Date: 2023-04-28

Enhancements

Improved the placeholder syntax of the rule engine #10470.
The parameters of certain actions support using placeholder syntax to dynamically fill in the content of strings. The format of the placeholder syntax is ${key}.
Prior to the improvement, the key in ${key} could only contain letters, numbers, and underscores. Now the key supports any UTF8 character after the improvement.

4.4.17

Release Date: 2023-04-13

Enhancements

When the listener enabled with Proxy Protocol receives a TCP port probe, no error logs will be printed anymore emqx/esockd#172.
Before the fix, if the listener had enabled the proxy protocol (listener.tcp.external.proxy_protocol=on), but the connection was disconnected after the TCP handshake was completed and before the proxy information was received, the following error log would be printed:
```
[error] supervisor: 'esockd_connection_sup - <0.3265.0>', errorContext: connection_shutdown, reason: {recv_proxy_info_error,tcp_closed}, offender:
```
After the fix, no logs will be printed, but you can still view the error reason statistics through the emqx_ctl listeners command.
Improved the error logs of the listener for file descriptor exhaustion emqx/esockd#173.
Before the improvement, the log was:
```
[error] Accept error on 0.0.0.0:1883: emfile
```
After the improvement, the log became:
```
[error] Accept error on 0.0.0.0:1883: EMFILE (Too many open files)
```
Improved the performance of the rule engine when there are many rules #10283
Before the improvement, when there were many rules, the rule engine would consume a lot of CPU time on rule queries and matching, becoming a performance bottleneck. In this optimization, by simply adding a cache to the rule list, the rule execution efficiency in this scenario was greatly improved. In our test, we created 700 rules that did not perform any actions (bound to the "do_nothing" debugging action) on a 32-core 32G virtual machine, and sent MQTT messages to EMQX at a rate of 1000 messages per second (that is, the rule trigger frequency was 700 * 1000 times per second). In the above scenario, the CPU usage of the optimized rule engine dropped to 55% ~ 60% of the previous level.

Fixes

Fixed the issue where Erlang distribution could not use TLS #9981.
For more information on Erlang distribution, see here.
Fixed the issue where MQTT bridging could not verify TLS certificates with wildcard domains on the peer side #10094.
Fixed the issue where EMQX could not timely clear the information of disconnected MQTT connections when there were too many messages backlogged in the retainer. #10189.
Before the fix, the emqx_retainer plugin and the EMQX connection information cleanup task shared a process pool. Therefore, if the process pool was blocked by a large number of retain message distribution tasks, many disconnected MQTT connection information would not be cleared in time. See #9409 for details. After the fix, the emqx_retainer plugin uses a separate process pool to avoid this problem.
Fixed the issue where the path of the template file service-monitor.yaml in the Helm Chart was incorrect. #10229

4.4.16

Release Date: 2023-03-10

Enhancements

Change "EMQX" to "EMQX" from the outputs of CLIs and names of plugins #10099.

Bug fixes

Avoid changing the payload of MQTT messages when printing debug logs #10091. Before this fix, if EMQX receives a message with Payload "e\ne\nc\nc\n2\n\n\n", the log message will be as follows:

2023-03-08T13:28:04.320622+08:00 [debug] mqttx_e34bd582@127.0.0.1:54020 [MQTT] RECV PUBLISH(Q1, R0, D0, Topic=t/1, PacketId=39467, Payload=e, e, c, c, 2, , , )

This is the corresponding log message now:

2023-03-08T14:26:50.935575+08:00 [debug] mqttx_e34bd582@127.0.0.1:54020 [MQTT] RECV PUBLISH(Q1, R0, D0, Topic=t/1, PacketId=39467, Payload=<<"e\ne\nc\nc\n2\n\n\n">>)

4.4.15

Release Date: 2023-03-03

This version update includes 8 enhancements and 13 fixes. Among the enhancements, there are new exciting new features worth highlighting:

Upgrade the MongoDB client library of EMQX to support MongoDB 5.1 and above.
Dashboard supports the proxy protocol of HAProxy.
Release the Ubuntu 22.04 installation package.

Enhancements

The MongoDB library has been upgraded to support MongoDB version 5.1 and greater.
Support proxy protocol of HAProxy for dashboard API 9803.
Added Ubuntu 22.04 package release #9831.
Improve the integration of the banned and the delayed feature #9790. Now when publishing a delayed message will check first if its source client is banned, if true, this publish will be ignored.
Security enhancement for retained messages #9790. The retained messages will not be published if the publisher client is banned.
Now the corresponding session will be kicked when client is banned by clientid #9904.
Add more debug logs for authentication and ACL #9943.
Expose the stats live_connections.count and live_connections.max to Prometheus #9929.

Bug fixes

Fixed an error when forward MQTT messages with User-Property using the republish action #9942.
fix some issues in descriptions of the actions, resources and emqx-modules #9931.
fix there's no error logs when query the JWKS server failed #9931.
The returned client lists of HTTP query GET /api/v4/clients?_page=2&_limit=20 to different nodes might be inconsistent #9926.
Fix the problem that new MQTT TLS connections failed to establish after release hot upgrade #9810. For more detailed information please see: emqx/esockd#170.
Fix a problem in the log message format of MQTT packets #9858. Before this fix, a comma was missing between the flags (DUP) of the fixed header and the fields (ClientId) of the variable header:
```
2023-01-29T13:40:36.567692+08:00 [debug] 127.0.0.1:50393 [MQTT] RECV CONNECT(Q0, R0, D0ClientId=test_client, ... Password=undefined)
```
Avoid crash logs in CoAP gateway when receiving liveness checking packets from Load Balancer #9869.
Fix the exclusive topics aren't removed when the session has already been cleaned #9868.
fix the EMQX reports {case_clause,{error,closed}} error log message when websocket connections interrupted emqx/cowboy#8.
fix sometimes the rules cannot be enabled automatically after EMQX is restarted #9911.
fix the {badarg,[{ets,lookup,[gproc,{shared, ... error logs during shutdown #9919.
Delete the files directory when resources were deleted to avoid files leaking #10039.

4.4.11

Release Date: 2022-11-26

This release included 18 enhancements and 14 bug fixes. Among the enhancements, therer are new exciting new features worth highlighting.

OCSP (Online Certificate Status Protocol) Stapling.
CRL (Certificate Revocation List) cache.
OTP upgrade from 24.1.5-3 to 24.3.4.2-1.
Customizable client aliases to make it easier to when creating customized authentication and authorization.

It is possible to hot-upgrade from older version v4.4 to this version. Please note though, in order to start making use of the new features such as OCSP Stapling, CRL cache, a node restart (and configuration change) is required.

Enhancements

OTP upgrade from 24.1.5-3 to 24.3.4.2-1 #9265. Change highlights:
- Erlang/OTP SSL library vulnerability fix
- Added support for OCSP (Online Certificate Status Protocol) Stapling
- Added CRL (Certificate Revocation List) cache auto refresh
Added support for OCSP stapling and CRL caching #9297.
Added support for specifying custom modules for adding clientid and common name aliases #9297. Now you can implement a simple callback to enrich clients with aliases, and then use the aliases in the authentication and authorization (ACL) rules' place holders (%cida for clientid alias and %cna for username alias).
Added support for specifying custom modules for custom authentication #9297. To support simple authentication rules, it is no longer necessary to implement a full-blown plugin.
Added a JWT management for Rule-Engine, for creating and refreshing JWT tokens in rule engine actions #9241. This feature is so far only used in EMQX Enterprise Google PubSub integration. Can be used as webhook integration's JWT authentication against the webhook service endpoint.
Make sure listener's tls_versions config value is one or more of tlsv1, tlsv1.1, tlsv1.2, tlsv1.3 #9260.
Remove useless information from the dashboard listener failure log #9260.
We now trigger the 'message.acked' hook after the CoAP gateway sends a message to the device and receives the ACK from the device #9264. With this change, the CoAP gateway can be combined with the offline message caching function (in the emqx enterprise), so that CoAP devices are able to read the missed messages from the database when it is online again.
Support to use placeholders like ${var} in the HTTP Headers of rule-engine's Webhook actions #9239.
Asynchronously refresh the resources and rules during emqx boot-up #9199. This is to avoid slowing down the boot if some resources spend long time establishing the connection.
Add a warning log if the ACL check failed for subscription #9124. This is to make the ACL deny logging for subscription behave the same as for publish.
JWT ACL claim supports all action to imply the rules applie to both pub and sub #9044.
Added a log censor to avoid logging sensitive data #9189. If the data to be logged is a map or key-value list which contains sensitive key words such as password, the value is obfuscated as ******.
Enhanced log security in ACL modules, sensitive data will be obscured #9242.
Add management.bootstrap_apps_file configuration to bulk import default app/secret when EMQX initializes the database #9273.
Added two new configs for deterministic order of authentication and ACL checks #9283. The two new global config names are auth_order and acl_order. When multiple ACL or auth plugins (or modules) are enabled, without this config, the order (in which each backend is queried) is determined by the start/restart order of the plugin (or module). Meaning, if a plugin (or module) is restarted after initial boot, it may get ordered to the end of the list. With this config, you may set the order with a comma-speapated ACL or auth plugin names (or aliases). For example: acl_order = jwt,http, this will make sure jwt is always checked before http, meaning if JWT is not found (or no acl cliam) for a client, then the ACL check will fallback to use the HTTP backend.
Added configurations to enable more client.disconnected events (and counter bumps) #9267. Prior to this change, the client.disconnected event (and counter bump) is triggered when a client performs a 'normal' disconnect, or is 'kicked' by system admin, but NOT triggered when a stale connection had to be 'discarded' (for clean session) or 'takeovered' (for non-clean session) by new connection. Now it is possible to set configs broker.client_disconnect_discarded and broker.client_disconnect_takeovered to on to enable the event in these scenarios.
For Rule-Engine resource creation failure, delay before the first retry #9313. Prior to this change, the retry delay was added after the retry failure.

Bug fixes

Fix get trace list crash when trace not initialize. #9156
Fix create trace sometime failed by end_at time has already passed. #9156
Fix that after uploading a backup file with an non-ASCII filename, HTTP API GET /data/export fails with status code 500 #9224.
Improve the display of rule's 'Maximum Speed' counter to only reserve 2 decimal places #9185. This is to avoid displaying floats like 0.30000000000000004 on the dashboard.
Fix the issue that emqx prints too many error logs when connecting to mongodb but auth failed #9184.
Fix that after receiving publish in idle mode the emqx-sn gateway may panic #9024.
"Pause due to rate limit" log level demoted from warning to notice #9134.
Restore old emqx_auth_jwt module API, so the hook callback functions registered in older version will not be invalidated after hot-upgrade #9144.
Fixed the response status code for the /status endpoint #9210. Before the fix, it always returned 200 even if the EMQX application was not running. Now it returns 503 in that case.
Fix message delivery related event encoding #9226 For rule-engine's input events like $events/message_delivered, and $events/message_dropped, if the message was delivered to a shared-subscription, the encoding (to JSON) of the event will fail. Affected versions: v4.3.21, v4.4.10, e4.3.16 and e4.4.10.
Make sure Rule-Engine API supports Percent-encoding rule_id and resource_id in HTTP request path #9190. Note that the id in POST /api/v4/rules should be literals (not encoded) when creating a rule or resource. See docs Create Rule Create Resource.
Calling 'DELETE /alarms/deactivated' now deletes deactived alarms on all nodes, including remote nodes, not just the local node #9280.
When republishing messages or bridge messages to other brokers, check the validity of the topic and make sure it does not have topic wildcards #9291.
Disable authorization for api/v4/emqx_prometheus endpoint on management api listener (default 8081) #9294.

4.4.10

Release Date: 2022-10-14

Enhancements

TLS listener memory usage optimization #9005. New config listener.ssl.$NAME.hibernate_after to hibernate TLS connection process after idling. Hibernation can reduce RAM usage significantly, but may cost more CPU. This configuration is by default disabled. Our preliminary test shows a 50% of RAM usage decline when configured to '5s'.
TLS listener default buffer size to 4KB #9007 Eliminate uncertainty that the buffer size is set by OS default.
Disable authorization for api/v4/emqx_prometheus endpoint #8955.
Added a test to prevent a last will testament message to be published when a client is denied connection #8894.
More rigorous checking of flapping to improve stability of the system #9045. Previsouly only normal disconnects are counted, now the connection rejections (e.g. authentication failure) is also included. Find more about flapping detection in EMQX document
QoS1 and QoS2 messages in session's buffer are re-dispatched to other members in the group when the session terminates #9094. Prior to this enhancement, one would have to set broker.shared_dispatch_ack_enabled to true to prevent sessions from buffering messages, however this acknowledgement costs extra resources.
Fix delayed publish timing inaccuracy caused by OS time change #8908.

Bug fixes

Fix the latency statistics error of the slow subscription module when stats_type is internal or response #8981.
Fix HTTP client library to handle SSL socket passive signal #9145.
Hide redis password in error logs #9071 In this change, it also included more changes in redis client:
- Improve redis connection error logging eredis#19. Also added support for eredis to accept an anonymous function as password instead of passing around plaintext args which may get dumpped to crash logs (hard to predict where). This change also added format_status callback for gen_server states which hold plaintext password so the process termination log and sys:get_status will print '******' instead of the password to console.
- Avoid pool name clashing eredis_cluster#22. Same format_status callback is added here too for gen_servers which hold password in their state.
Fix shared subscription message re-dispatches #9094.
- When discarding QoS 2 inflight messages, there were excessive logs
- For wildcard deliveries, the re-dispatch used the wrong topic (the publishing topic, but not the subscribing topic), caused messages to be lost when dispatching.
Fix shared subscription group member unsubscribe issue when 'sticky' strategy is used. Prior to this fix, if a previously picked member unsubscribes from the group (without reconnect) the message is still dispatched to it. This issue only occurs when unsubscribe with the session kept. Fixed in #9119
Fix shared subscription 'sticky' strategy when there is no local subscriptions at all. Prior to this change, it may take a few rounds to randomly pick group members until a local subscriber is hit (and then start sticking to it). After this fix, it will start sticking to whichever randomly picked member even when it is a subscriber from another node in the cluster. Fixed in #9122
Fix rule engine fallback actions metrics reset #9125.

4.4.9

Release Date: 2022-09-17

Enhancements

The exp, nbf and iat claims in JWT authentication support non-integer timestamps

Bug fixes

Fix rule engine update behaviour which may initialize actions for disabled rules
Fix the issue that the IP address bound to the Dashboard listener did not take effect
Fix the issue that shared subscriptions might get stuck in an infinite loop when shared_dispatch_ack_enabled is set to true
Fix the issue that the rule engine SQL crashes when subject matching null values

4.4.8

Release Date: 2022-08-29

Enhancements

Add GET /trace/:name/detail API to view log trace file information
Improve the log when LwM2M packet parsing fails
Improve the rule engine error log, the log will contain the rule ID when the action execution fails
Improve log when loaded_modules and loaded_plugins files do not exist
Add a guide for changing the default password on Dashboard

Bug fixes

Fix client.disconnected event not trigger in some cases
Fix the issue that the built-in database authentication did not distinguish the pagination statistics of the authentication data of the client ID and username
Fix Redis driver process leak problem
Fix rule engine MQTT bridge to AWS IOT connection timeout issue
Fix GET /listener request crashing when listener is not ready
Fix the issue that the comparison between any variable and null value in the rule engine SQL always returns false after v4.4.1
Fix incorrectly managing emqx_modules applications as plugins
Fix the issue that when the execution priority of ExHook is higher than that of the rule engine, the topic filtered by the ExHook Message Hook will not trigger the rule engine
Fix the issue that the ExHook management process was forcibly killed due to the supervisor shutdown timeout
Fix the issue that the Client ID parameter in ExProto client.connect hook is not defined
Fix ExProto not triggering disconnect event when client is kicked

4.4.7

Release Date: 2022-08-11

Important Changes

As of version 4.4.7, we will no longer provide packages for macOS 10

Enhancements

Allows the connection process to be configured to be garbage collected after the TLS handshake is complete to reduce memory footprint, which can reduce memory consumption by about 35% per SSL connection, but increases CPU consumption accordingly
Allows configuring the log level of the TLS handshake log to view the detailed handshake process

4.4.6

Release Date: 2022-07-29

Enhancement

Supports searching and paging of rules in rule engine
Provides CLI ./bin/emqx check_conf to actively check if the configuration is correct
Optimizing Shared Subscription Performance

Bug fixes

Fix the issue that once the old version of EMQX is uninstalled after hot upgrade, EMQX will not be able to start again
Fix the issue that the keep-alive check for UDP clients in the Multilingual Protocol Extension was incorrect, causing clients not to expire
Fix the issue that the client information in the Multilingual Protocol Extension was not updated in time
Fix the issue that when the client specified Clean Session as false to reconnect, the shared subscription message in the flight window would be re-dispatched to the old session process
Fix the issue that the emqx_lua_hook plugin cannot cancel the message publishing

4.4.5

Release Date: 2022-06-30

Enhancement

QoS and Retain flag in rule engine's message republish actions can now use placeholders
Supports exclusive subscriptions, that is, only one subscriber is allowed for a topic
Dashboard and management API's HTTPS listeners can now use password-protected private key files, providing key_password configuration item
Support for placeholders %u and %c in topic rewrite rules
Support setting MQTT 5.0 properties in the API request for message publishing, such as message expiry interval, response topic, etc.
Optimize the UI when creating rule engine resources, such as folding some uncommon options, etc.
Opened 4 TCP-related configuration items: KeepAlive, TCP_NODELAY, SO_RCVBUF and SO_SNDBUF for the underlying gRPC connection of ExHook

Bug fixes

Fix the issue of inaccurate memory calculation in Linux OS, and calculate the memory usage of the current OS instead of the memory usage of EMQX
Fix the issue that the old disconnect event of ExHook would be triggered later than the new connect event when the client reconnects
Fix the issue that the execution order of topic rewriting and delayed publish is not fixed, now it is fixed to execute topic rewriting first
Fix the issue that rule engine could not encode MQTT 5.0 user properties
Fix the issue that the count of connack.auth_error is inaccurate when the client uses a protocol version below MQTT v5.0 to access
Fix the issue that the UDP listeners of LwM2M and CoAP gateways could not bind to the specified network interface
Fix Dashboard not starting after removing the default Dashboard user in the configuration file
Fix client.subscribe hook not being able to reject subscriptions
If the placeholder in the ACL rule is not replaced, the client's publish or subscribe operation will be rejected

4.4.4

Release Date: 2022-06-01

Enhancement

Add more time transformation functions to the SQL of rule engine
Add the float2str/2 function to the SQL of rule engine to support specifying the output precision of floating point numbers
Support for using JWT for authorization, now MQTT clients can authorize using specific claims that include a pub-sub whitelist
Improved authentication related metrics to make it easier to understand, now client.authenticate = client.auth.success + client.auth.failure
Support binding the listener of the REST API to a specified network interface
Support multi-condition query and fuzzy query for user data in authentication and authorization using built-in database as data source
Supports querying clients using the length of the message queue and the number of dropped messages as conditions
Support to configure the log time format to be compatible with the time format in older versions
When use_username_as_clientid is configured to true and the client connects without specifying a username, the connection is now rejected with a reason code 0x85
Full randomisation of app secrets (previously partially randomised)
When using CLI for backup and recovery, it is no longer required that the backup file must be located in the backup folder of the EMQX data directory
Hot upgrades between incompatible versions will now be rejected
Allow white spaces in EMQX's installation path
Boot script fail fast on invalid node name (improve error message readability)

Bug fixes

Fix the issue that rule engine's SQL function hexstr_to_bin/1 could not handle half-byte
Fix the issue that the alarm was not cleared when the rule engine resource was deleted
Fix Dashboard HTTPS listener's verify option not taking effect
Fix the issue that messages were lost when the peer session was terminated during the delivery of QoS 1 messages through shared subscriptions
Fix the issue that when the log tracer encounters large packets, the heap size grows too fast and triggers the policy of forcibly closeing the connection process
Fix the issue that the MQTT-SN client would be disconnected when retransmitting QoS 2 messages
Fix the issue that the subscriber's connection was disconnected due to the wrong user properties type in the message publishing API api/v4/mqtt/publish
Fix the issue that some authentication algorithms were unavailable due to the PostgreSQL driver not adapting to OTP 24
Fix the issue that the returned results did not match the query conditions when querying subscriptions with multiple conditions
Fix rule engine resource connection test not working
Fix multiple Dashboard display issues

4.4.3

Release Date: 2022-04-18

Enhancement

Rule engine supports resetting metrics of the specified rule
Add connection confirmation and authorization completion events to the rule engine
Rule engine supports copying rule for fast reuse
SQL in rule engine supports zip, gzip and other compression and decompression functions
Improve the error message when rule engine fails to parse payload
Improve the connection test for some resources in rule engine
Support setting execution priority for ExHook
ExHook callback interface adds a Protobuf field RequestMeta meta to return the EMQX cluster name
Support local policy for shared subscriptions, which will preferentially send messages to shared subscribers under the node where messages flow in. In some scenarios, the efficiency of shared message scheduling will be improved, especially when the MQTT bridge is configured as a shared subscription
RSA-PSK-AES256-GCM-SHA384, RSA-PSK-AES256-CBC-SHA384, RSA-PSK-AES128-GCM-SHA256 and RSA-PSK-AES128-CBC- SHA256 four new TLS PSK cipher suites are supported, removing two insecure cipher suites PSK-3DES-EDE-CBC-SHA and PSK-RC4-SHA from the default configuration
Diagnostic logging for wait_for_table of mnesia
- Prints check points of mnesia internal stats
- Prints check points of per table loading stats, help to locate the problem of long table loading time.
Subscribing to an empty topic is prohibited in strict mode
Generate default files when loaded_modules and loaded_plugins files do not exist

Bug fixes

Fix the issue that the TLS configuration item server_name_indication is set to disable and does not take effect
Fix potential process leak issue in MongoDB driver
Fix the issue that the password of the default Dashboard user modified via the CLI command would be reset after the node leaves the cluster
Silence grep and sed warnings in docker-entrypoint.sh
Fix the backup file cannot be deleted and downloaded when the API path contains ISO8859-1 escape characters
Fix the issue that the Redis driver would crash when DNS resolution failed, etc
Fix the issue that the headers field configuration in the Data to Web Server action of the rule engine did not take effect
Fix the issue that the MQTT Bridge plugin cannot be started when only the subscription topic is configured but QoS is not configured
When creating a rule, if a rule with the same ID already exists, the rules engine will now report an error instead of replacing the existing rule
Fix the issue that the HTTP driver process pool may not be deleted

4.4.2

Release Date: 2022-04-01

Important changes

For Docker images, the configuration directory /opt/emqx/etc has been removed from the VOLUME list, making it easier for users to rebuild images with changed configurations.
CentOS 7 Erlang runtime rebuilt on OpenSSL-1.1.1n (previously 1.0), prior to v4.3.13, EMQX will fail to handshake and trigger malformed_handshake_data exception when clients use certain cipher suites.
CentOS 8 Erlang runtime system rebuilt on RockyLinux 8. centos8 will remain in the package name for backward compatibility.

Enhancement

Windows package support for building on Erlang/OTP 24.
Add command line interface emqx_ctl pem_cache clean to allow forcibly clear x509 certificate cache to reload immediately after certificate file update.
Refactored ExProto so that anonymous clients can also be displayed on Dashboard.
Topic configuration items in bridges can now use ${node} placeholders.
Add validation of UTF-8 strings in MQTT packets in strict mode. When set to true, invalid UTF-8 strings will cause the client to disconnect.
MQTT-SN gateway supports initiative to synchronize registered topics after session resumed.
Improve the writing precision of rule engine floating point data from 10 decimal places to 17 decimal places.
EMQX will prompt how to modify the initial password of Dashboard at startup.

Bug fixes

Fix the issue that the el8 installation package cannot be started on Amazon Linux 2022, the error content is errno=13 Permission denied.
Fix an issue where the client could not reconnect if the connection process was blocked in some cases. Now waiting for more than 15 seconds without a response will force the old connection process to be closed.
Fix the issue of query resource request timeout when rule engine resource is unavailable.
Fix the issue of {error, eexist} error when re-run after hot upgrade failed.
Fix an issue where publishing to a non-existing topic alias would crash the connection.
Fix 500 error when querying lwm2m client list on another node via HTTP API.
Fix HTTP API for subscribing topics crashes when invalid QoS are passed in.
Fix the issue that the connection count was not updated because the related resources were not released when the connection process accessed through the ExProto exited abnormally.
Fix an issue where the value of server_keepalive configuration item would be incorrectly applied to MQTT v3.1.1 clients.
Fix Stomp client not firing $event/client_connection event messages.
Fix the issue that the system memory alarm was incorrectly activated when EMQX was started.
Fixed an issue where messages that failed to be delivered due to unregistered topics were not retransmitted when topics were successfully registered with the MQTT-SN client.
Fix EMQX startup output error log when duplicate plugins are configured in loaded_plugins file.
Fix MongoDB related features outputting excessive error logs when configured incorrectly.
Add format check for Dashboard User and AppID, special characters such as / are not allowed.
Corrected the reason code in the DISCONNECT packet returned when kicking the client to 0x98.
Auto subscriptions will ignore empty topics.

4.4.1

Release Date: 2022-02-21

This patch release only includes a CI change for the Windows package.

4.4.0

Release Date: 2022-02-18

NOTE:

4.4.0 is in sync with: 4.3.12.
The build of Windows package has some issues in the current version, we will fix it in the next version

The compare base of this change set is 4.3.12

Important changes

For Debian/Ubuntu users, Debian/Ubuntu package (deb) installed EMQX is now started from systemd. This is to use systemd's supervision functionality to ensure that EMQX service restarts after a crash. The package installation service upgrade from init.d to systemd has been verified, it is still recommended that you verify and confirm again before deploying to the production environment, at least to ensure that systemd is available in your system
Package name scheme changed comparing to 4.3. 4.3 format: emqx-centos8-4.3.8-amd64.zip 4.4 format: emqx-4.4.0-rc.1-otp24.1.5-3-el8-amd64.zip
- Erlang/OTP version is included in the package name, providing the possibility to release EMQX on multiple Erlang/OTP versions
- centos is renamed to el. This is mainly due to centos8 being dead (replaced with rockylinux8)
MongoDB authentication supports DNS SRV and TXT Records resolution, which can seamlessly connect with MongoDB Altas
Support dynamic modification of MQTT Keep Alive to adapt to different energy consumption strategies.
Support 4.3 to 4.4 rolling upgrade of clustered nodes. See upgrade document for more dtails.
TLS for cluster backplane (RPC) connections. See clustering document for more details.
Add new feature for slow subscription to count the time spent in the process of message transmission, and record and display the time-consuming clients and topics.
Add new feature for online log tracing to support real-time tracing of client events and viewing on the dashboard.

Minor changes

Bumped default boot wait time from 15 seconds to 150 seconds because in some simulated environments it may take up to 70 seconds to boot in build CI
Dashboard supports relative paths and custom access paths
Supports configuring whether to forward retained messages with empty payload to suit users who are still using MQTT v3.1. The relevant configurable item is retainer.stop_publish_clear_msg
Multi-language hook extension (ExHook) supports dynamic cancellation of subsequent forwarding of client messages
Rule engine SQL supports the use of single quotes in FROM clauses, for example: SELECT * FROM 't/#'
Change the default value of the max_topic_levels configurable item to 128. Previously, it had no limit (configured to 0), which may be a potential DoS threat
Improve the error log content when the Proxy Protocol message is received without proxy_protocol configured.
Add additional message attributes to the message reported by the gateway. Messages from gateways such as CoAP, LwM2M, Stomp, ExProto, etc., when converted to EMQX messages, add fields such as protocol name, protocol version, user name, client IP, etc., which can be used for multi-language hook extension (ExHook)
HTTP client performance improvement
Add openssl-1.1 to RPM dependency

4.3.22

Release Date: 2022-11-26

Enhancements

Make sure listener's tls_versions config value is one or more of tlsv1, tlsv1.1, tlsv1.2, tlsv1.3 #9260.
Remove useless information from the dashboard listener failure log #9260.
We now trigger the 'message.acked' hook after the CoAP gateway sends a message to the device and receives the ACK from the device #9264. With this change, the CoAP gateway can be combined with the offline message caching function (in the emqx enterprise), so that CoAP devices are able to read the missed messages from the database when it is online again.
Support to use placeholders like ${var} in the HTTP Headers of rule-engine's Webhook actions #9239.
Asynchronously refresh the resources and rules during emqx boot-up #9199. This is to avoid slowing down the boot if some resources spend long time establishing the connection.
Add a warning log if the ACL check failed for subscription #9124. This is to make the ACL deny logging for subscription behave the same as for publish.
JWT ACL claim supports all action to imply the rules applie to both pub and sub #9044.
Added a log censor to avoid logging sensitive data #9189. If the data to be logged is a map or key-value list which contains sensitive key words such as password, the value is obfuscated as ******.
Enhanced log security in ACL modules, sensitive data will be obscured #9242.
Add management.bootstrap_apps_file configuration to bulk import default app/secret when EMQX initializes the database #9273.
Added two new configs for deterministic order of authentication and ACL checks #9283. The two new global config names are auth_order and acl_order. When multiple ACL or auth plugins (or modules) are enabled, without this config, the order (in which each backend is queried) is determined by the start/restart order of the plugin (or module). Meaning, if a plugin (or module) is restarted after initial boot, it may get ordered to the end of the list. With this config, you may set the order with a comma-speapated ACL or auth plugin names (or aliases). For example: acl_order = jwt,http, this will make sure jwt is always checked before http, meaning if JWT is not found (or no acl cliam) for a client, then the ACL check will fallback to use the HTTP backend.
Added configurations to enable more client.disconnected events (and counter bumps) #9267. Prior to this change, the client.disconnected event (and counter bump) is triggered when a client performs a 'normal' disconnect, or is 'kicked' by system admin, but NOT triggered when a stale connection had to be 'discarded' (for clean session) or 'takeovered' (for non-clean session) by new connection. Now it is possible to set configs broker.client_disconnect_discarded and broker.client_disconnect_takeovered to on to enable the event in these scenarios.
For Rule-Engine resource creation failure, delay before the first retry #9313. Prior to this change, the retry delay was added after the retry failure.

Bug fixes

Fix that after uploading a backup file with an non-ASCII filename, HTTP API GET /data/export fails with status code 500 #9224.
Improve the display of rule's 'Maximum Speed' counter to only reserve 2 decimal places #9185. This is to avoid displaying floats like 0.30000000000000004 on the dashboard.
Fix the issue that emqx prints too many error logs when connecting to mongodb but auth failed #9184.
Fix that after receiving publish in idle mode the emqx-sn gateway may panic #9024.
"Pause due to rate limit" log level demoted from warning to notice #9134.
Restore old emqx_auth_jwt module API, so the hook callback functions registered in older version will not be invalidated after hot-upgrade #9144.
Fixed the response status code for the /status endpoint #9210. Before the fix, it always returned 200 even if the EMQX application was not running. Now it returns 503 in that case.
Fix message delivery related event encoding #9226 For rule-engine's input events like $events/message_delivered, and $events/message_dropped, if the message was delivered to a shared-subscription, the encoding (to JSON) of the event will fail. Affected versions: v4.3.21, v4.4.10, e4.3.16 and e4.4.10.
Make sure Rule-Engine API supports Percent-encoding rule_id and resource_id in HTTP request path #9190. Note that the id in POST /api/v4/rules should be literals (not encoded) when creating a rule or resource. See docs Create Rule Create Resource.
Calling 'DELETE /alarms/deactivated' now deletes deactived alarms on all nodes, including remote nodes, not just the local node #9280.
When republishing messages or bridge messages to other brokers, check the validity of the topic and make sure it does not have topic wildcards #9291.
Disable authorization for api/v4/emqx_prometheus endpoint on management api listener (default 8081) #9294.

4.3.21

Release Date: 2022-09-14

Enhancements

TLS listener memory usage optimization #9005. New config listener.ssl.$NAME.hibernate_after to hibernate TLS connection process after idling. Hibernation can reduce RAM usage significantly, but may cost more CPU. This configuration is by default disabled. Our preliminary test shows a 50% of RAM usage decline when configured to '5s'.
TLS listener default buffer size to 4KB #9007 Eliminate uncertainty that the buffer size is set by OS default.
Disable authorization for api/v4/emqx_prometheus endpoint #8955.
Added a test to prevent a last will testament message to be published when a client is denied connection #8894.
More rigorous checking of flapping to improve stability of the system #9045.
QoS1 and QoS2 messages in session's buffer are re-dispatched to other members in the group when the session terminates #9094. Prior to this enhancement, one would have to set broker.shared_dispatch_ack_enabled to true to prevent sessions from buffering messages, however this acknowledgement costs extra resources.
Fix delayed publish timing inaccuracy caused by OS time change #8908.

Bug fixes

Fix HTTP client library to handle SSL socket passive signal #9145.
Hide redis password in error logs #9071 In this change, it also included more changes in redis client:
- Improve redis connection error logging eredis#19. Also added support for eredis to accept an anonymous function as password instead of passing around plaintext args which may get dumpped to crash logs (hard to predict where). This change also added format_status callback for gen_server states which hold plaintext password so the process termination log and sys:get_status will print '******' instead of the password to console.
- Avoid pool name clashing eredis_cluster#22. Same format_status callback is added here too for gen_servers which hold password in their state.
Fix shared subscription message re-dispatches #9094.
- When discarding QoS 2 inflight messages, there were excessive logs
- For wildcard deliveries, the re-dispatch used the wrong topic (the publishing topic, but not the subscribing topic), caused messages to be lost when dispatching.
Fix shared subscription group member unsubscribe issue when 'sticky' strategy is used. Prior to this fix, if a previously picked member unsubscribes from the group (without reconnect) the message is still dispatched to it. This issue only occurs when unsubscribe with the session kept. Fixed in #9119
Fix shared subscription 'sticky' strategy when there is no local subscriptions at all. Prior to this change, it may take a few rounds to randomly pick group members until a local subscriber is hit (and then start sticking to it). After this fix, it will start sticking to whichever randomly picked member even when it is a subscriber from another node in the cluster. Fixed in #9122
Fix rule engine fallback actions metrics reset #9125.

4.3.20

Release Date: 2022-09-17

Enhancements

The exp, nbf and iat claims in JWT authentication support non-integer timestamps

Bug fixes

Fix rule engine update behaviour which may initialize actions for disabled rules
Fix the issue that the IP address bound to the Dashboard listener did not take effect
Fix the issue that shared subscriptions might get stuck in an infinite loop when shared_dispatch_ack_enabled is set to true
Fix the issue that the rule engine SQL crashes when subject matching null values

4.3.19

Release Date: 2022-08-29

Enhancements

Improve the log when LwM2M packet parsing fails
Improve the rule engine error log, the log will contain the rule ID when the action execution fails
Improve log when loaded_modules and loaded_plugins files do not exist
Add a guide for changing the default password on Dashboard

Bug fixes

Fix client.disconnected event not trigger in some cases
Fix the issue that the built-in database authentication did not distinguish the pagination statistics of the authentication data of the client ID and username
Fix Redis driver process leak problem
Fix rule engine MQTT bridge to AWS IOT connection timeout issue
Fix GET /listener request crashing when listener is not ready
Fix the issue that the comparison between any variable and null value in the rule engine SQL always returns false after v4.3.12
Fix incorrectly managing emqx_modules applications as plugins
Fix the issue that when the execution priority of ExHook is higher than that of the rule engine, the topic filtered by the ExHook Message Hook will not trigger the rule engine
Fix the issue that the ExHook management process was forcibly killed due to the supervisor shutdown timeout
Fix the issue that the Client ID parameter in ExProto client.connect hook is not defined
Fix ExProto not triggering disconnect event when client is kicked

4.3.18

Release Date: 2022-08-11

Important Changes

Upgraded the OTP version used to solve the low probability of random process unresponsiveness caused by OTP bugs. Users who are still using 4.3 are recommended to upgrade to this version
From the next release, we will stop supporting macOS 10 and provide an installation package for macOS 11

Enhancements

Allows the connection process to be configured to be garbage collected after the TLS handshake is complete to reduce memory footprint, which can reduce memory consumption by about 35% per SSL connection, but increases CPU consumption accordingly
Allows configuring the log level of the TLS handshake log to view the detailed handshake process

4.3.17

Release Date: 2022-07-29

Enhancement

Supports searching and paging of rules in rule engine
Provides CLI ./bin/emqx check_conf to actively check if the configuration is correct
Optimizing Shared Subscription Performance

Bug fixes

Fix the issue that once the old version of EMQX is uninstalled after hot upgrade, EMQX will not be able to start again
Fix the issue that the keep-alive check for UDP clients in the Multilingual Protocol Extension was incorrect, causing clients not to expire
Fix the issue that the client information in the Multilingual Protocol Extension was not updated in time
Fix the issue that when the client specified Clean Session as false to reconnect, the shared subscription message in the flight window would be re-dispatched to the old session process
Fix the issue that the emqx_lua_hook plugin cannot cancel the message publishing

4.3.16

Release Date: 2022-06-30

Enhancement

QoS and Retain flag in rule engine's message republish actions can now use placeholders
Supports exclusive subscriptions, that is, only one subscriber is allowed for a topic
Dashboard and management API's HTTPS listeners can now use password-protected private key files, providing key_password configuration item
Support for placeholders %u and %c in topic rewrite rules
Support setting MQTT 5.0 properties in the API request for message publishing, such as message expiry interval, response topic, etc.
Optimize the UI when creating rule engine resources, such as folding some uncommon options, etc.
Opened 4 TCP-related configuration items: KeepAlive, TCP_NODELAY, SO_RCVBUF and SO_SNDBUF for the underlying gRPC connection of ExHook

Bug fixes

Fix the issue of inaccurate memory calculation in Linux OS, and calculate the memory usage of the current OS instead of the memory usage of EMQX
Fix the issue that the old disconnect event of ExHook would be triggered later than the new connect event when the client reconnects
Fix the issue that the execution order of topic rewriting and delayed publish is not fixed, now it is fixed to execute topic rewriting first
Fix the issue that rule engine could not encode MQTT 5.0 user properties
Fix the issue that the count of connack.auth_error is inaccurate when the client uses a protocol version below MQTT v5.0 to access
Fix the issue that the UDP listeners of LwM2M and CoAP gateways could not bind to the specified network interface
Fix Dashboard not starting after removing the default Dashboard user in the configuration file
Fix client.subscribe hook not being able to reject subscriptions
If the placeholder in the ACL rule is not replaced, the client's publish or subscribe operation will be rejected

4.3.15

Release Date: 2022-06-01

Enhancement

Add more time transformation functions to the SQL of rule engine
Add the float2str/2 function to the SQL of rule engine to support specifying the output precision of floating point numbers
Support for using JWT for authorization, now MQTT clients can authorize using specific claims that include a pub-sub whitelist
Improved authentication related metrics to make it easier to understand, now client.authenticate = client.auth.success + client.auth.failure
Support binding the listener of the REST API to a specified network interface
Support multi-condition query and fuzzy query for user data in authentication and authorization using built-in database as data source
Supports querying clients using the length of the message queue and the number of dropped messages as conditions
Support to configure the log time format to be compatible with the time format in older versions
When use_username_as_clientid is configured to true and the client connects without specifying a username, the connection is now rejected with a reason code 0x85
Full randomisation of app secrets (previously partially randomised)
Hot upgrades between incompatible versions will now be rejected
Allow white spaces in EMQX's installation path
Boot script fail fast on invalid node name (improve error message readability)

Bug fixes

Fix the issue that rule engine's SQL function hexstr_to_bin/1 could not handle half-byte
Fix the issue that the alarm was not cleared when the rule engine resource was deleted
Fix Dashboard HTTPS listener's verify option not taking effect
Fix the issue that messages were lost when the peer session was terminated during the delivery of QoS 1 messages through shared subscriptions
Fix the issue that when the log tracer encounters large packets, the heap size grows too fast and triggers the policy of forcibly closeing the connection process
Fix the issue that the MQTT-SN client would be disconnected when retransmitting QoS 2 messages
Fix the issue that the returned results did not match the query conditions when querying subscriptions with multiple conditions
Fix rule engine resource connection test not working
Fix multiple Dashboard display issues

4.3.14

Release Date: 2022-04-18

Enhancement

Rule engine supports copying rule for fast reuse
SQL in rule engine supports zip, gzip and other compression and decompression functions
Improve the error message when rule engine fails to parse payload
Improve the connection test for some resources in rule engine
Support setting execution priority for ExHook
ExHook callback interface adds a Protobuf field RequestMeta meta to return the EMQX cluster name
Support local policy for shared subscriptions, which will preferentially send messages to shared subscribers under the node where messages flow in. In some scenarios, the efficiency of shared message scheduling will be improved, especially when the MQTT bridge is configured as a shared subscription
RSA-PSK-AES256-GCM-SHA384, RSA-PSK-AES256-CBC-SHA384, RSA-PSK-AES128-GCM-SHA256 and RSA-PSK-AES128-CBC- SHA256 four new TLS PSK cipher suites are supported, removing two insecure cipher suites PSK-3DES-EDE-CBC-SHA and PSK-RC4-SHA from the default configuration
Diagnostic logging for wait_for_table of mnesia
- Prints check points of mnesia internal stats
- Prints check points of per table loading stats, help to locate the problem of long table loading time.
Subscribing to an empty topic is prohibited in strict mode
Generate default files when loaded_modules and loaded_plugins files do not exist

Bug fixes

Fix the issue that the TLS configuration item server_name_indication is set to disable and does not take effect
Fix potential process leak issue in MongoDB driver
Fix the issue that the password of the default Dashboard user modified via the CLI command would be reset after the node leaves the cluster
Silence grep and sed warnings in docker-entrypoint.sh
Fix the backup file cannot be deleted and downloaded when the API path contains ISO8859-1 escape characters
Fix the issue that the Redis driver would crash when DNS resolution failed, etc
Fix the issue that the headers field configuration in the Data to Web Server action of the rule engine did not take effect
Fix the issue that the MQTT Bridge plugin cannot be started when only the subscription topic is configured but QoS is not configured
When creating a rule, if a rule with the same ID already exists, the rules engine will now report an error instead of replacing the existing rule
Fix the issue that the HTTP driver process pool may not be deleted

4.3.13

Release Date: 2022-04-01

Important changes

For Docker images, the configuration directory /opt/emqx/etc has been removed from the VOLUME list, making it easier for users to rebuild images with changed configurations.
CentOS 7 Erlang runtime rebuilt on OpenSSL-1.1.1n (previously 1.0), prior to v4.3.13, EMQX will fail to handshake and trigger malformed_handshake_data exception when clients use certain cipher suites.
CentOS 8 Erlang runtime system rebuilt on RockyLinux 8. centos8 will remain in the package name for backward compatibility.

Enhancement

Add command line interface emqx_ctl pem_cache clean to allow forcibly clear x509 certificate cache to reload immediately after certificate file update.
Refactored ExProto so that anonymous clients can also be displayed on Dashboard.
Topic configuration items in bridges can now use ${node} placeholders.
Add validation of UTF-8 strings in MQTT packets in strict mode. When set to true, invalid UTF-8 strings will cause the client to disconnect.
MQTT-SN gateway supports initiative to synchronize registered topics after session resumed.
Improve the writing precision of rule engine floating point data from 10 decimal places to 17 decimal places.
EMQX will prompt how to modify the initial password of Dashboard at startup.

Bug fixes

Fix the issue that the el8 installation package cannot be started on Amazon Linux 2022, the error content is errno=13 Permission denied.
Fix an issue where the client could not reconnect if the connection process was blocked in some cases. Now waiting for more than 15 seconds without a response will force the old connection process to be closed.
Fix the issue of query resource request timeout when rule engine resource is unavailable.
Fix the issue of {error, eexist} error when re-run after hot upgrade failed.
Fix an issue where publishing to a non-existing topic alias would crash the connection.
Fix 500 error when querying lwm2m client list on another node via HTTP API.
Fix HTTP API for subscribing topics crashes when invalid QoS are passed in.
Fix the issue that the connection count was not updated because the related resources were not released when the connection process accessed through the ExProto exited abnormally.
Fix an issue where the value of server_keepalive configuration item would be incorrectly applied to MQTT v3.1.1 clients.
Fix Stomp client not firing $event/client_connection event messages.
Fix the issue that the system memory alarm was incorrectly activated when EMQX was started.
Fixed an issue where messages that failed to be delivered due to unregistered topics were not retransmitted when topics were successfully registered with the MQTT-SN client.
Fix EMQX startup output error log when duplicate plugins are configured in loaded_plugins file.
Fix MongoDB related features outputting excessive error logs when configured incorrectly.
Add format check for Dashboard User and AppID, special characters such as / are not allowed.
Corrected the reason code in the DISCONNECT packet returned when kicking the client to 0x98.
Auto subscriptions will ignore empty topics.

4.3.12

Release Date: 2022-02-11

Enhancement

Rule engine supports the configuration of rules and actions for the event of abnormal loss of client messages to enhance the user's custom processing capabilities in this scenario
Improve the relevant metrics during the execution of the rule engine SQL matching
Fuzzy search on client supports special characters such as *, (, )
Improve ACL-related metrics to solve the issue that the count does not increase due to hitting the ACL cache
Added connected_at field to webhook event notifications
Log client state before terminating client due to holding the lock too long

Bug fixes

Fixed the issue that the metrics interface does not return authentication metrics such as client.acl.deny by default
Fixed the issue that the subscription query interface did not return paginated data
Fix the issue of parsing failure when STOMP handles TCP sticky packets
Fix the issue where the session creation time option was not available when filtering clients
Fix the issue where memory alarms might not be triggered after restarting
Fix the crash of import data when user data exists in emqx_auth_mnesia plugin

4.3.11

Release Date: 2021-12-17

EMQX 4.3.11 is released now, it mainly includes the following changes:

Enhancement

Support the configuration of whether to continue to deliver empty retained messages to suit users who are still using the MQTT v3.1 protocol

Bug fixes

Fix the issue of incorrect calculation of memory usage
Fix the issue that the Path option of Webhook Action in rule engine doesn't support the use of ${Variable}
Fix the issue that the connection failure log will continue to be printed when stopping MQTT Bridge plugin in some cases

4.3.10

Release Date: 2021-11-11

EMQX 4.3.10 is released now, it mainly includes the following changes:

Bug fixes (Important):

Fix STOMP gateway live-upgrade failure
Github PR: emqx#6110
Fix the issue that emqx cannot start after updating the listener configuration through Dashboard
Github PR: emqx#6121

Enhancement:

Introduced pushback for MQTT clients
Github PR: emqx#6065

4.3.9

Release Date: 2021-11-04

EMQX 4.3.9 is released now, it mainly includes the following changes:

Bug fixes (Important):

Fix the issue that calls between clusters may cause the client process to lose response
Github PR: emqx#6062
WebHook's HTTP client SSL configuration parse
Github PR: emqx#5696
MongoDB resources allow host names
Github PR: emqx#6035
Performance improvement for built-in database ACL (emqx_auth_mnesia)
Github PR: emqx#5885
Fix the issue that the authentication based on the built-in database incorrectly transcodes the HTTP request parameters
Github PR: emqx#5674
Fix the issue that resources cannot be released after the rule engine disables the rules in cluster
Github PR: emqx#5731
Fix some issues of STOMP gateway
Github PR: emqx#6040

Bug fixes (Minor):

Fixed the issue that the Client ID containing "" characters could not be searched in a fuzzy manner
Github PR: emqx#5978
Fix the issue that variable byte integers may be larger than 4 bytes
Github PR: emqx#5826

Enhancement:

Improve client kick (forced step-down)
Github PR: emqx#6030
Add support for new cipher suites for LwM2M gateway
Github PR: emqx#5970
Introduced interleaving for priority queues (to avoid low priority queue stavation)
Github PR: emqx#5666
HTTP authentication plugin disable superuser requests by default
Github PR: emqx#5567

4.3.8

Release Date: 2021-08-10

EMQX 4.3.8 is released now, it mainly includes the following changes:

Bug fixes:

Fix the rule engine rule import fails
Github PR: emqx#5512
Fix the Path field in the Webhook action of rule engine cannot be used
Github PR: emqx#5468
Fix the issue that the Force Shutdown mechanism cannot take effect when the process is suspended
Github PR: emqx#5460
Fix the issue that the k8s deployment EMQX cluster cannot be restarted correctly in some cases
Github PR: emqx#5646, emqx#5428
Fix exproto cross-node process call error
Github PR: emqx#5436

Enhancement:

Add automatic reconnection mechanism and related configuration items for request timeout for exhook to enhance reliability
Github PR: emqx#5447
Add disconnect retry mechanism for exproto
Github PR: emqx#5436

Note: Starting from this version, CentoOS 7 requires the use of openssl 1.1.1. For the installation method of openssl upgrade, please refer to: FAQ - Incorrect OpenSSL Vesion

4.3.7

Release Date: 2021-08-09

EMQX 4.3.7 is released now, it mainly includes the following changes:

Bug fixes:

Fix the issue that the current HTTP KeepAlive behavior may cause some servers to disconnect
Github PR: emqx#5395
Fix the issue that the command line interface cannot print certain characters
Github PR: emqx#5411
Fix the issue of coding error when LwM2M gateway sends integer numbers
Github PR: emqx#5425

4.3.6

Release Date: 2021-07-28

EMQX 4.3.6 is released now, it mainly includes the following changes:

Enhancement:

Support disable HTTP Pipelining
Github PR: emqx#5279
ACL supports IP address list
Github PR: emqx#5328

4.3.5

Release Date: 2021-06-28

EMQX 4.3.5 is released now, it mainly includes the following changes:

Bug fixes:

Fix the issue that messages may be lost after canceling the subscription when multiple shared subscriptions are established by the same client
Github PR: emqx#5098

4.3.4

Release Date: 2021-06-23

EMQX 4.3.4 is released now, it mainly includes the following changes:

Bug fixes:

CoAP gateway cannot resolve certain URIs
Github Issue: emqx#5062 Github PR: emqx#5059
Multi-language extension hooks may fail to start
Github PR: emqx#5004
When the rule engine deletes a resource, if there is a rule that depends on the resource, it will cause a crash
Github PR: emqx#4996
HTTP authentication and Webhook do not support Query String
Github PR: emqx#4981
Ensure the forwarding order of messages between nodes in the default configuration
Github PR: emqx#4979

4.3.3

Release Date: 2021-06-05

EMQX 4.3.3 is released now, it mainly includes the following changes:

emqx

Enhancement:

Data dump support to get imported data from HTTP request
Github PR: emqx#4900

Bug fixes:

Fix the crash caused by not configuring the JWKS endpoint
Github PR: emqx#4916
Fix MQTT-SN subscription in cluster environment
Github PR: emqx#4915
Fix Webhook cannot use TLS
Github PR: emqx#4908
Fix the issue that the parameter error in the client's multi-condition query may cause a crash
Github PR: emqx#4916
Fix incorrect calculation of memory usage
Github PR: emqx#4891

4.3.2

Release Date: 2021-05-27

EMQX 4.3.2 is released now, it mainly includes the following changes:

emqx

Bug fixes:

Topic metrics monitoring cannot be used in the cluster environment
Github PR: emqx#4870
Fix some errors in message parsing
Github PR: emqx#4858
Fix the conflict between MQTT-SN sleep mode and KeepAlive mechanism
Github PR: emqx#4842
Broker may crash when a large number of clients are offline
Github Issue: emqx#4823 Github PR: emqx#4824
Mark the resource as unavailable when the rule engine fails to refresh the resource
Github PR: emqx#4821

4.3.1

Release Date: 2021-05-14

EMQX 4.3.1 is released now, it mainly includes the following changes:

emqx

Bug fixes:

CPU consumption increases exponentially with the number of topic levels after route compression
Github PR: emqx#4800
Fix poor large frame concatenation performance
Github Issue: emqx#4787 Github PR: emqx#4802
Newly added shared subscription strategy is unavailable
Github Issue: emqx#4808 Github PR: emqx#4809
Fixed the incorrect implementation of metrics/stats for retained messages and messages of delayed publish
Github PR: emqx#4778, emqx#4778
Ensure line breaks between json logs
Github PR: emqx#4778

4.3.0

Release Date: 2021-05-06

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 EMQX 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 EMQX 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 EMQX (previously only for EMQX Enterprise)

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
EMQX 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

4.2.14

Release Date: 2021-08-02

EMQX 4.2.14 is released now, it mainly includes the following changes:

Bug fixes:

Fix the issue of unavailable hot upgrade

4.2.13

Release Date: 2021-06-28

EMQX 4.2.13 is released now, it mainly includes the following changes:

emqx

Bug fixes:

Fix the issue that messages may be lost after canceling the subscription when multiple shared subscriptions are established by the same client
GitHub PR: emqx#5104

emqx-auth-http

Bug fixes:

Fix the issue of printing crash log after request timeout
GitHub PR: emqx-auth-http#263
Support Query String Parameters
GitHub PR: emqx-auth-http#264

emqx-web-hook

Bug fixes:

Support Query String Parameters
GitHub PR: emqx-web-hook#284

4.2.12

Release Date: 2021-05-07

EMQX 4.2.12 is released now, it mainly includes the following changes:

emqx

** Bug Fix **:

Fixed a wait-for-table timeout bug which may lead to premature EMQX start up when there is a lot of Mnesia data to load.

GitHub PR: emqx#4724

** Performance Improvement **:

Optimisation for massive concurrent subscribe/unsubscribe requests handling

GitHub PR: emqx#4732 GitHub PR: emqx#4738

4.2.11

Release Date: 2021-04-16

EMQX 4.2.11 is released now, it mainly includes the following changes:

emqx

Bug fixes:

Fix the issue that the WebSocket connection cannot use the peer certificate as the username
Github PR: emqx#4574

emqx-management

Bug fixes:

Fix the issue of authentication data export and import
Github PR: emqx-management#320

4.2.10

Release Date: 2021-04-12

EMQX 4.2.10 is released now, it mainly includes the following changes:

emqx-management

Bug fixes:

When export data, use base64 encoding for emqx_auth_clientid
Github PR: emqx-management#314
Fix MQTT bridge inflight reference booking error
Github PR: emqx-bridge-mqtt#132

4.2.9

Release Date: 2021-03-24

EMQX 4.2.9 is released now, it mainly includes the following changes:

emqx

Bug fixes:

Fix MQTT packet receiving count issue
Github PR: emqx#4425
Fix the processing of heartbeat packets
Github Issue: emqx#4370 Github PR: emqx#4425

emqx-auth-mnesia

Bug fixes:

Fixed database storage issues and CLI issues
Github PR: emqx-auth-mnesia#54
Fix the issue that the password_hash configuration does not take effect
Github PR: emqx-auth-mnesia#56

4.2.8

Release Date: 2021-03-10

EMQX 4.2.8 is released now, it fixes a bug in MQTT message parser.

4.2.7

Release Date: 2021-01-29

EMQX 4.2.7 is released now, it mainly includes the following changes:

emqx-auth-http

Bug fixes:

Fix the issue that the HTTP long connection is disconnected when the Keepalive timeout period or the maximum number of requests is reached, causing the request to be lost
Github PR: emqx-auth-http#245

emqx-web-hook

Bug fixes:

Fix the issue that the HTTP long connection is disconnected when the Keepalive timeout period or the maximum number of requests is reached, causing the request to be lost
Github PR: emqx-web-hook#272
Fix SSL certificate configuration issue
Github PR: emqx-web-hook#264

emqx-auth-redis

Bug fixes:

Fix Redis reconnection failure
Github PR: emqx-auth-redis#195

4.2.6

Release Date: 2021-01-16

EMQX 4.2.6 is released now, it mainly includes the following changes:

emqx

Bug fixes:

Fix the wrong port used by remsh
Github PR: emqx#4016

emqx-auth-http

Enhancement:

The host field in the HTTP request header uses the original URL configured by the user
Github PR: emqx-auth-http#240

Bug fixes:

Fix the issue of unavailable GET request
Github PR: emqx-auth-http#238

emqx-web-hook

Enhancement:

The host field in the HTTP request header uses the original URL configured by the user
Github PR: emqx-web-hook#256
Use the default port when the port is not included in the URL
Github PR: emqx-web-hook#253

Bug fixes:

Fix the issue of SSL configuration item parsing error
Github PR: emqx-web-hook#252
Fix the issue of unavailable GET request
Github PR: emqx-web-hook#254

emqx-management

Bug fixes:

Increase the duration field of the alarm, fix the issue that the front-end may cause calculation errors due to time inconsistency
Github PR: emqx-management#304

emqx-dashboard

Enhancement:

Improve the display of alarm duration
Github PR: emqx-dashboard#271

ehttpc

Bug fixes:

Fix the issue of gen_server:call/3 timeout causing the reply to be sent to the message queue of the calling process
Github PR: ehttpc#2

4.2.5

Release Date: 2020-12-23

EMQX 4.2.5 is released now, it mainly includes the following changes:

emqx-auth-http

Fix wrong field name in HTTP request header
Github PR: emqx-auth-http#229

emqx-web-hook

Update the underlying HTTP client driver to solve the issue of unresponsive connection process caused by driver stuck
Github PR: emqx-web-hook#240

4.2.4

Release Date: 2020-12-11

EMQX 4.2.4 is released now, it mainly includes the following changes:

emqx

Support configuration of SSL/TLS certificate chain length and password of keyfile
Github PR: emqx#3901

emqx-auth-http

Update the underlying HTTP client driver to solve the issue of unresponsive connection process caused by driver stuck
Github PR: emqx-auth-http#213

emqx-auth-mongo

Fix the type error problem caused by no matching query results
Github PR: emqx-auth-mongo#240

emqx-auth-redis

Fix the issue that the redis driver did not report an error when it failed to start in cluster mode
Github PR: emqx-auth-redis#187

emqx-rel

Supports pulling private image through secret for helm chart
Github PR: emqx-rel#626
Improve security
Github PR: emqx-rel#612

4.2.3

Release Date: 2020-11-13

EMQX 4.2.3 is released now, it mainly includes the following changes:

emqx-web-hook

Support for inserting variables in the requested URL path
Github PR: emqx-web-hook#225 Github Issue: emqx-web-hook#224
Support setting Content Type
Github PR: emqx-web-hook#230

emqx-rel

Fix the issue of compilation failure when LC_ALL is not equal to en_US.UTF-8
Github PR: emqx-rel#605 Github Issue: emqx-rel#604
Support creating and running other services before emqx container starts
Github PR: emqx-rel#608
Allows to set a variable number of configuration items for the container
Github PR: emqx-rel#609

emqx-sn

Fix the issue that trying to publish a will message will cause a crash
Github PR: emqx-sn#169
Fix the issue that setting an inappropriate value for the from field
Github PR: emqx-sn#170

emqx-rule-engine

Keep backward compatible
Github PR: emqx-rule-engine#189
Fix statistics of messages.received metric
Github PR: emqx-rule-engine#193

emqx-management

Fix statistics of messages.received metric
Github PR: emqx-management#284
Enable data import and export functions to be used in a cluster environment
Github PR: emqx-management#288

emqx-redis

Supports one-way and two-way SSL/TLS of Redis 6.0
Github PR: emqx-auth-redis#180

4.2.2

Release Date: 2020-10-24

EMQX 4.2.2 is released now, it mainly includes the following changes:

emqx

Bug fixes:

Fix the issue of inaccurate topic statistics rate calculation
Github PR: emqx#3784

emqx-web-hook

Enhancement:

Support GET and DELETE methods
Github PR: emqx-web-hook#220
Add node and disconnected_at fields
Github PR: emqx-web-hook#215

emqx-auth-pgsql

Bug fixes:

Fix the issue that %a placeholder doesn't take effect
Github PR: emqx-auth-pgsql#208

emqx-auth-mysql

Bug fixes:

Fix the issue that %a placeholder doesn't take effect
Github PR: emqx-auth-mysql#245

4.2.1

Release Date: 2020-09-29

EMQX 4.2.1 is released now, it mainly includes the following changes:

emqx

Bug fixes:

Fix the issue that the No Local logic is not handled correctly, which causes messages to accumulate in the flight window and message queue
Github PR: emqx#3741 Github Issue: emqx#3738

emqx-bridge-mqtt

Bug fixes:

Fix the issue that the rule engine MQTT subscription cannot receive messages
Github PR: emqx-bridge-mqtt#108

emqx-dashboard

Bug fixes:

Fix display error of long Client ID
Github PR: emqx-dashboard#262

emqx-auth-mongo

Bug fixes:

Fix the issue that only the first match is processed when the ACL query statement has multiple matching results
Github PR: emqx-auth-mongo#231

4.2.0

Release Date: 2020-09-05

EMQX 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 EMQX Broker to help us improve the product. This function is enabled by default and supports manual disabled. Visit EMQX 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

4.1.4

Release Date: 2020-08-28

EMQX 4.1.4 is released now, it mainly includes the following changes:

emqx

Bug fixes:

Fix the issue of abnormal memory growth caused by the topic metrics feature
Github PR: emqx#3680

emqx-bridge-mqtt

Enhancements:

The clientid configuration item supports ${node} placeholders to optimize the user experience under the cluster
Github PR: emqx-bridge-mqtt#99

emqx-management

Bug fixes:

Fix the issue that the data migration function is not available under Windows
Github PR: emqx-management#262

emqx-lua-hook

Bug fixes:

Fix the issue that the Username field cannot be obtained
Github PR: emqx-lua-hook#115

4.1.3

Release Date: 2020-08-04

EMQX 4.1.3 is released now, it mainly includes the following changes:

emqx-management

Bug fixes:

Add type checking for the payload field in PUBLISH API
Github PR: emqx/emqx-management#250

emqx-retainer

Bug fixes:

Fix the issue that the retained message will not be sent when the subscription topic contains both '+' and '#'
Github PR: emqx/emqx-retainer#146

4.1.2

Release Date: 2020-07-23

EMQX 4.1.2 is released now, it mainly includes the following changes:

emqx

Bug fixes:

Fix the issue that the topic alias is not used to replace the topic
Github PR: emqx/emqx#3616
Fix the issue that some operations take up too much CPU
Github PR: emqx/emqx#3581

emqx-rel

Bug fixes:

Fix the issue that the console no longer outputs the log after the log is filled with all log files when running emqx by docker
Github PR: emqx/emqx-rel#559

4.1.1

Release Date: 2020-07-03

EMQX 4.1.1 is released now, it mainly includes the following changes:

emqx-retainer

Bug fixes:

Fix performance issues
Github PR: emqx/emqx-retainer#141

emqx-bridge-mqtt

Bug fixes:

Change mount point to optional configuration
Github PR: emqx/emqx-bridge-mqtt#84

emqx-rel

Bug fixes:

Hiding sensitive env from docker's logging out
Github Issue: emqx/emqx-rel#524
Github PR: emqx/emqx-rel#542
Thanks: emqx/emqx-rel#525 - daadu

emqx-lua-hook

Bug fixes:

Fix the issue that there is no unload script and CLI when the plugin is unloaded
Github PR: emqx/emqx-lua-hook#106

4.1.0

Release Date: 2020-06-04

EMQX 4.1.0 is released now, it mainly includes the following changes:

Enhancements:

Support multi-language extension and provide SDK, supported languages: Python, Java
Support topic based metrics
Supports loading the latest configuration when the plugin starts
Support for topic aliases when messages are forwarded
Add subscription option configuration for proxy subscriptions
Support fuzzy query and multi condition query of client list
Support fuzzy query of subscription list
Support to add simple authentication information on Dashboard
Support data migration between versions
MQTT AUTH Packet is supported. At present, only SCRAM-SHA-1 authentication mechanism is supported and users can expand it by themselves
Support for obtaining network addresses and ports when using the proxy protocol
Add authentication plugin based on Mnesia database (completely replace emqx-auth-clientid and emqx-auth-username plugins in subsequent versions)
Support for editing rules in rule engine
Support comment configuration items when running EMQX through Docker
LwM2M gateway plugin supports IPv6 and listens to multiple ports at the same time
CoAP gateway plugin supports IPv6
JWT authentication plugin supports configuration of jwerl signature format

Bug fixes:

Fix the issue that EMQX could not start when etc/emqx.conf was read-only
Fix the issue that the connection process crashes in some cases
Fix the issue that the browser doesn't support the current SSL/TLS certificates
Fix the issue that the MQTT bridge plugin doesn't send heartbeat packets by default
Fix the issue that the abnormal login detection function does not delete the expired data, resulting in memory growth
Fix the issue that the built-in ACL module did not clear the ACL cache when reloading
Fix the issue that client.disconnected event in WebHook plugin goes wrong in some cases
Fix the issue that MQTT-SN gateway plugin doesn't support specifying listening IP address and supports IPv6

4.0.7

Release Date: 2020-05-09

EMQX 4.0.7 is released now, which mainly includes the following changes:

emqx

Bug fixes:

Fix the issue that the browser doesn't support the current SSL / TLS certificates
Github PR: emqx/emqx#3448
Fix the issue of connection process crashing in some cases, which is the feedback from Github issue#3455
Github PR: emqx/emqx#3458

emqx-web-hook

Bug fixes:

Fix the issue that the client.disconnected event went wrong in some cases
Github PR: emqx/emqx-web-hook#187

4.0.6

Release Date: 2020-04-22

EMQX 4.0.6 is released now, it mainly includes the following changes:

emqx

Bug fixes:

Fix the issue that abnormal client detection did not delete expired data
Github PR: emqx/emqx#3407
Fix the issue that the Proxy Protocol function does not work when using WebSocket
Github PR: emqx/emqx#3372

emqx-bridge-mqtt

Bug fixes:

Fix the issue that PINREQ packets will not be sent by default
Github PR: emqx/emqx-bridge-mqtt#67

emqx-rule-engine

Bug fixes:

Fix wrong type of rule engine timestamp
Github Commit: emqx/emqx-rule-engine#27ca37
Fix the feature of testing SQL statements in the rule engine
Github Commit: emqx/emqx-rule-engine#33fcba

4.0.5

Release Date: 2020-03-17

EMQX 4.0.5 is released now. This version mainly focuses on bug fixes.

emqx

Bug fixes:

Fix GC policy
Github PR: emqx/emqx#3317
Fix the issue that the value of the Maximum-QoS property was set incorrectly
Github issue: emqx/emqx#3304, emqx/emqx#3315 Github PR: emqx/emqx#3321
Fix the issue that CPU usage would increase abnormally every 15 seconds when EMQX Broker was running in the docker environment
Github issue: emqx/emqx#3274 Github PR: emqx/emqx-rel#462
Fixed the issue that configuration items named "node.*" don't take effect in emqx.conf
Github issue: emqx/emqx#3302 Github PR: emqx/emqx-rel#463

emqx-rule-engine (plugin)

Bug fixes:

Fix the issue that the rule engine does not support Payload with UTF-8 string
Github issue: emqx/emqx#3287 Github PR: emqx/emqx#3299

emqx-sn (plugin)

Bug fixes:

Fix MQTT-SN subscription loss
Github issue: emqx/emqx#3275 Github PR: emqx/emqx-sn#156

4.0.4

Release Date: 2019-03-06

EMQX 4.0.4 is released now. This version mainly focuses on bug fixes.

emqx

Bug fixes:

Fix the issue that the acl_deny_action configuration item does not working
Github issue: emqx/emqx#3266
Github PR: emqx/emqx#3286
Fix wrong type of mountpoint configuration item
Github issue: emqx/emqx#3271
Github PR: emqx/emqx#3272
Fix the issue that the peer_cert_as_username configuration item does not working
Github issue: emqx/emqx#3281
Github PR: emqx/emqx#3291
Fix the issue that the error log is still printed after the connection is closed normally
Github PR: emqx/emqx#3290

emqx-dashboard (plugin)

Bug fixes:

Fix blank issue in Dashboard node drop-down list
Github issue: emqx/emqx#3278
Github PR: emqx/emqx-dashboard#206

emqx-retainer (plugin)

Bug fixes:

The behavior after the maximum number of retained messages has been stored is corrected by the inability to store any retained messages to retained messages that can replace existing topics
Github PR: emqx/emqx-retainer#136

4.0.3

Release Date: 2019-02-21

EMQX 4.0.3 is released now. This version mainly focuses on bug fixes.

emqx

Enhancements:

Add an option to allow client bypass auth plugins
Github PR: emqx/emqx#3253

Bug fixes:

Fix the issue of printing unnecessary error logs under some competitive conditions
Github PR: emqx/emqx#3246

emqx-management (plugin)

Bug fixes:

Remove fields and functions that are no longer in use and fix wrong field values
Github PR: emqx/emqx-management#176
Fix the issue that the client list cannot be returned correctly in the cluster
Github PR: emqx/emqx-management#173
Fix HTTPS Listening Options
Github PR: emqx/emqx-management#172
Fix the return format of the application list
Github PR: emqx/emqx-management#169

4.0.2

Release Date: 2019-02-07

EMQX 4.0.2 is released now. This version mainly focuses on bug fixes and performance optimizes.

emqx

Enhancements:

Enhance performance of json encode/decode
Github PR: emqx/emqx#3213, emqx/emqx#3230, emqx/emqx#3235
Compress the generated object code
Github PR: emqx/emqx#3214

Bug fixes:

Fix the issue that DISCONNECT packet will not be sent in some cases
Github PR: emqx/emqx#3208
Fix the issue that the connection will be closed when broker received the same Packet ID
Github PR: emqx/emqx#3233

emqx-stomp (plugin)

Bug fixes:

Fix the issue that the maximum number of connections doesn't take effect
Github PR: emqx/emqx-stomp#93

emqx-auth-redis (plugin)

Bug fixes:

Fix the issue that internal module start failed
Github PR: emqx/emqx-auth-redis#151

cowboy (dependency)

Bug fixes:

Fix the issue that will message will not be sent in some cases when using Websocket connection
Github Issue: emqx/emqx#3221
Github Commit: emqx/cowboy#3b6bda

4.0.1

Release Date: 2019-01-17

EMQX 4.0.1 is released now. This version mainly focuses on bug fixes and performance optimizes.

emqx

Enhancements:

force_shutdown_policy defaults to disable
Github PR: emqx/emqx#3184
Support timed global GC and provide configuration items
Github PR: emqx/emqx#3190
Tune the default value of force_gc_policy
Github PR: emqx/emqx#3192, emqx/emqx#3201
Tune and optimize the Erlang VM
Github PR: emqx/emqx#3195, emqx/emqx#3197

Bug fixes:

Fix the issue that the feature of ban is abnormal due to using the wrong unit
Github PR: emqx/emqx#3188
Fix the handling of Retain As Publish and keep the value of Retain in bridge mode
Github PR: emqx/emqx#3189
Fix the issue of unable to use multiple websocket listening ports
Github PR: emqx/emqx#3196
Fix the issue that EMQX may not send DISCONNECT packet when session is takeovered
Github PR: emqx/emqx#3208

emqx-rule-engine

Enhancements:

Provide more arrays functions of SQL
Github PR: emqx/emqx-rule-engine#136
Reduce performance impact when no rules are configured
Github PR: emqx/emqx-rule-engine#138

emqx-web-hook

Bug fixes:

Fix crash due to parameter mismatch
Github PR: emqx/emqx-web-hook#167

4.0.0

Release Date: 2019-01-10

EMQX 4.0.0 is now released. In this version we significantly improved the throughput performance by refactoring the session and channel, improved the extensibility by adding more hooks and counters, redesigned rule engine SQL that filter messages/events mainly by topics, and also lots of improvements in edge.

General

Enhancements:

Greatly improve message throughput performance, and reduce CPU and memory usage.
Optimize handling of MQTT 5.0 packets
Rule engine supports new SQL
Modify metrics naming and add more metrics
Modify parameters of hooks and add more hooks
emqtt provides command line interfaces to publish and subscribe

Bug fixes:

Fix the issue that failure of SSL handshake could cause crash
Fix the issue that max_subscriptions don't working
Fix message out-of-order issues when forwarding across clusters
Fix the issue that REST API and CLI cannot get multiple routes for a topic

REST API

Enhancements:

Support IPv6
The default listening port for the HTTP API server is changed from 8080 to 8081
Remove all REST API related with sessions
connections APIs change to clients APIs，the new APIs support features in sessions
Support return the real topic of shared subscription in querying subscriptions API
Support to configure the default AppID and AppSecret
The HTTP API for publishing message now supports base64 encoded payload

Bug fixes:

Fix the issue that encoded URI isn't handled correctly

Authentication

Enhancements:

HTTP authentication plugin supports users to defining HTTP request headers in profile
Clientid and username authentication plugin Resupport to configure the default clientid and username in profile

Password-Based Authentication

Monitoring

Access Control

Integration

Integrate with OpenTelemetry

JT/T 808 Gateway

Incompatible Changes between EMQX 4.4 and EMQX 5.1

Incompatible Changes between EMQX 4.4 and EMQX 5.1

EMQX Open Source Version 4 ​

4.4.19 ​

Enhancements ​

Bug fixes ​

4.4.18 ​

Enhancements ​

4.4.17 ​

Enhancements ​

Fixes ​

4.4.16 ​

Enhancements ​

Bug fixes ​

4.4.15 ​

Enhancements ​

Bug fixes ​

4.4.11 ​

Enhancements ​

Bug fixes ​

4.4.10 ​

Enhancements ​

Bug fixes ​

4.4.9 ​

Enhancements ​

Bug fixes ​

4.4.8 ​

Enhancements ​

Bug fixes ​

4.4.7 ​

Important Changes ​

Enhancements ​

4.4.6 ​

Enhancement ​

Bug fixes ​

4.4.5 ​

Enhancement ​

Bug fixes ​

4.4.4 ​

Enhancement ​

Bug fixes ​

4.4.3 ​

Enhancement ​

Bug fixes ​

4.4.2 ​

Important changes ​

Enhancement ​

Bug fixes ​

4.4.1 ​

4.4.0 ​

Important changes ​

Minor changes ​

4.3.22 ​

Enhancements ​

Bug fixes ​

4.3.21 ​

Enhancements ​

Bug fixes ​

4.3.20 ​

Enhancements ​

Bug fixes ​

4.3.19 ​

Enhancements ​

Bug fixes ​

4.3.18 ​

Important Changes ​

Enhancements ​

4.3.17 ​

Enhancement ​

Bug fixes ​

4.3.16 ​

Enhancement ​

Bug fixes ​

4.3.15 ​

EMQX Open Source Version 4

4.4.19

Enhancements

Bug fixes

4.4.18

Enhancements

4.4.17

Enhancements

Fixes

4.4.16

Enhancements

Bug fixes

4.4.15

Enhancements

Bug fixes

4.4.11

Enhancements

Bug fixes

4.4.10

Enhancements

Bug fixes

4.4.9

Enhancements

Bug fixes

4.4.8

Enhancements

Bug fixes

4.4.7

Important Changes

Enhancements

4.4.6

Enhancement

Bug fixes

4.4.5

Enhancement

Bug fixes

4.4.4

Enhancement

Bug fixes

4.4.3

Enhancement

Bug fixes

4.4.2

Important changes

Enhancement

Bug fixes

4.4.1

4.4.0

Important changes

Minor changes

4.3.22

Enhancements

Bug fixes

4.3.21

Enhancements

Bug fixes

4.3.20

Enhancements

Bug fixes

4.3.19

Enhancements

Bug fixes

4.3.18

Important Changes

Enhancements

4.3.17

Enhancement

Bug fixes

4.3.16

Enhancement

Bug fixes

4.3.15

Enhancement

Bug fixes

4.3.14

Enhancement

Bug fixes

4.3.13

Important changes

Enhancement