The HiveMQ team is pleased to announce the availability of HiveMQ 4.0.2. This is a maintenance release for the 4.0 series and brings the following improvements:

• Improved overall messaging performance.
• Improved connect performance.
• Improved HiveMQ start up in environments without default language.
• Improved logging for extension reload.
• Improved validation of extension system output objects and builders.
• Fixed an issue that could prevent a node to join an existing cluster.
• Added log statements indicating the state of ongoing data redistribution when a node leaves the cluster.
• Fixed an issue where HiveMQ start up could be blocked by a broken extension.
• Improved handling for queued messages when in-flight queue is already full.
• Added metrics for pending messages.
• Control Center now shows queued Qos 1 and 2 publish messages for each client.
• Fixed an issue with the subscription and retained message metric that could result in incorrect values.
• Fixed an issue where the duplicate delivery flag was set incorrectly.
• Added warning for possibly incorrect configuration of static cluster discovery.
• Improved client take over handling on cluster merge.
• HiveMQ now ignores non-extension folders in the extension directory.
• Fixed an issue that could lead to clients being listed twice in the Control Center client table.
• Fixed an issue where messages would only be delivered once, if a client simultaneously had identical shared and regular subscriptions.
• Fixed an issue where a QoS 2 publish message can expire, if the message was already sent but not acknowledged.
• Updated log messages when client was disconnected via Control Center.
• MQTT 5 clients now receive a DISCONNECT packet when exceeding maximum packet size.
• MQTT 5 clients now receive a DISCONNECT packet when disconnected via extension system or Control Center.
• Improved HiveMQ startup time on Windows.

You can download the new HiveMQ version here.

We recommend to upgrade if you are an HiveMQ 4.x user.

Have a great day, The HiveMQ Team

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