! 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)