! Read the migration guide (https://github.com/dotnet/MQTTnet/wiki/Upgrading-guide) before migrating to version 5!

Changes

• Memory usage optimizations (thanks to@mregen)
• Performance optimizations (thanks to@mregen)
• Removal of no longer supported .NET Frameworks(BREAKING CHANGE)
• Changed code signing and nuget certificate
• Namespace changes(BREAKING CHANGE)
• Removal of Managed Client(BREAKING CHANGE)
• Fixed missing release notes in nuget packages.
• Client: MQTT 5.0.0 is now the default version when connecting with a server(BREAKING CHANGE)
• Client: Fixed enhanced authentication.
• Client: Exposed WebSocket compression options in MQTT client options (thanks to@victornor,#2127)
• Server: Fixed enhanced authentication.
• Server: Set default for "MaxPendingMessagesPerClient" to 1000(BREAKING CHANGE)
• Server: Set SSL version to "None" which will let the OS choose the version(BREAKING CHANGE)
• Server: Added API for getting a single session (thanks to@AntonSmolkov,#2131)
• Server: Fixed "TryPrivate" (Mosquitto feature) handling (thanks to@victornor,#2125)(BREAKING CHANGE)
• Server: Fixed dead lock when awaiting a packet transmission but the packet gets dropped due to quotas (#2117, thanks to@AntonSmolkov)

Contributors

! Read the migration guide (https://github.com/dotnet/MQTTnet/wiki/Upgrading-guide) before migrating to version 5!

Changes

• Memory usage optimizations (thanks to@mregen)
• Performance optimizations (thanks to@mregen)
• Removal of no longer supported .NET Frameworks(BREAKING CHANGE)
• Changed code signing and nuget certificate
• Namespace changes(BREAKING CHANGE)
• Removal of Managed Client(BREAKING CHANGE)
• Client: MQTT 5.0.0 is now the default version when connecting with a server(BREAKING CHANGE)
• Client: Fixed enhanced authentication.
• Client: Exposed WebSocket compression options in MQTT client options (thanks to@victornor,#2127)
• Server: Set default for "MaxPendingMessagesPerClient" to 1000(BREAKING CHANGE)
• Server: Set SSL version to "None" which will let the OS choose the version(BREAKING CHANGE)
• Server: Fixed enhanced authentication.
• Server: Set default for "MaxPendingMessagesPerClient" to 1000(BREAKING CHANGE)
• Server: Set SSL version to "None" which will let the OS choose the version(BREAKING CHANGE)
• Server: Added API for getting a single session (thanks to@AntonSmolkov,#2131)
• Server: Fixed "TryPrivate" (Mosquitto feature) handling (thanks to@victornor,#2125)(BREAKING CHANGE)

Contributors

! Read the migration guide (https://github.com/dotnet/MQTTnet/wiki/Upgrading-guide) before migrating to version 5!

Changes

• Memory usage optimizations (thanks to@mregen)
• Performance optimizations (thanks to@mregen)
• Removal of no longer supported .NET Frameworks(BREAKING CHANGE)
• Changed code signing and nuget certificate
• Namespace changes(BREAKING CHANGE)
• Removal of Managed Client(BREAKING CHANGE)
• Client: MQTT 5.0.0 is now the default version when connecting with a server(BREAKING CHANGE)

Contributors

• Core: Fixed issue when parsing AUTH packet with 0 length body (#2039).
• nuget: Changed code signing and nuget certificate (BREAKING CHANGE).
• TopicTemplates: Updated samples, parameter validation (#2022).
• ManagedClient: Switch SubscribeAsync/UnsubscribeAsync to IEnumerable (#2026).
• Server: FixLoadingRetainedMessageAsync not executed (#2025).

• [Client] RestoredServer andPort behavior of client options (#2005).

• [Client] Fix None of the discovered or specified addresses match the socket address family. (#1997).
• [Client] Remove the obsolete attribute from the WithConnectionUri methods (#1979).

• [Core] Optimized packet serialization of PUBACK and PUBREC packets for protocol version 5.0.0 (#1939, thanks to@Y-Sindo).
• [Core] The package inspector is now fully async (#1941).
• [Client] Added a dedicated exception when the client is not connected (#1954, thanks to@marcpiulachs).
• [Client] The client will now throw aMqttClientUnexpectedDisconnectReceivedException when publishing a QoS 0 message which leads to a server disconnect (BREAKING CHANGE!,#1974, thanks to@fazho).
• [Client] Exposed the certificate selection event handler in client options (#1984).
• [Server] The server will no longer sendNoMatchingSubscribers when the actual subscription was non success (#1965, BREAKING CHANGE!).
• [Server] Fixed broken support fornull inAddServer method in ASP.NET integration (#1981).
• [ManagedClient] Added a new event (SubscriptionsChangedAsync) which is fired when a subscription or unsubscription was made (#1894, thanks to@pdufrene).
• [ManagedClient] Fixed race condition when server shuts down while subscribing (#1987, thanks to@marve).
• [TopicTemplate] Added new extension which provides a template engine for topics (#1932, thanks to@simonthum).

Contributors

• [Server] Added new events for delivered and dropped messages (#1866, thanks to@kallayj).
• [Server] The server will no longer treat a client which is receiving a large payload as alive. The packet must be received completely within the keep alive boundaries (BREAKING CHANGE!,#1883).
• [Server] Fixed "service not registered" exception in ASP.NET integration (#1889).

Contributors

• [Client] Added support for custom CA chain validation (#1851, thanks to@rido-min).
• [Client] Fixed handling of unobserved tasks exceptions (#1871).
• [Client] Fixed not specified ReasonCode when usingSendExtendedAuthenticationExchangeDataAsync (#1882, thanks to@rido-min).
• [Server] Fixed not workingUpdateRetainedMessageAsync public api (#1858, thanks to@kimdiego2098).
• [Server] Added support for custom DISCONNECT packets when stopping the server or disconnect a client (BREAKING CHANGE!,#1846).
• [Server] Added new property to stop the server from accepting new connections even if it is running (#1846).

Contributors

• [Client] Fixed wrong TLS options handling (#1830).
• [Client] Fixed NullReferenceExeption when performing a Ping when the client is not connected (#1831).