WindowsGattSessionMBS.MaxPduSizeChanged

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
event	Bluetooth	MBS WinFrameworks Plugin	23.0	❌ No	✅ Yes	❌ No	❌ No

An event that is raised when the maximum protocol data unit (PDU) size changes.

The PDU is also known as the maximum transmission unit (MTU).

MaxPduSizeChanged is raised whenever the negotiated MTU for the Attribute Protocol (ATT) is changed. And that can be changed or negotiated by a remote Bluetooth peripheral. As a developer, you can't change the value used by Windows itself, since that's fully managed by the operating system.
Also see the GattSession.MaxPduSize property which, as mentioned, is read-only.

WindowsGattSessionMBS.SessionStatusChanged

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
event	Bluetooth	MBS WinFrameworks Plugin	23.0	❌ No	✅ Yes	❌ No	❌ No

An event that is triggered when the GATT session status has changed.