GattSession.MaxPduSize Property
Definition
Important
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Gets the maximum protocol data unit (PDU) size. This metric is also known as the maximum transmission unit (MTU) size.
Also see the GattSession.MaxPduSizeChanged event.
public:
property unsigned short MaxPduSize { unsigned short get(); };uint16_t MaxPduSize();public ushort MaxPduSize { get; }var uInt16 = gattSession.maxPduSize;Public ReadOnly Property MaxPduSize As UShortProperty Value
The maximum protocol data unit (PDU) size.
Windows requirements
| App capabilities |
bluetooth
|
Remarks
The Windows operating system automatically fragments down larger protocol data unit (PDU) sizes sent to a remote device (wherever supported by the Bluetooth GATT/ATT spec). So under normal circumstances, there's no need for you to know the maximum transmission unit (MTU) size at the application layer if your application's goal is just to send data efficiently.
You can send large amounts of data, and it will be fragmented automatically by the OS using the MTU. Your application is not limited by the MTU size as to the data transfer of each packet.
If you want your application to customize the data sent based on the MTU (for example, encoding/codec), or to communicate the MTU size information out-of-band, then you can access the the MTU value using MaxPduSize and GattSession.MaxPduSizeChanged.