KW40Z BLE transmit data complete status

[kyleyang]

I have test the Wireless UART demo code and add customer define GATT for data notification.

Also removed the client demo code and all function works now.

Now I want to test the data throughput and package lost rate.

Is there any api that can report the status of data transmit complete or not?

Thanks.

[alexandruandree]

Hi,

To ensure low latency throughout the Bluetooth stack, there isn't any data transmit complete status implemented. But, because the ATT model does not allow interleaving transactions, we have an error event on the GATT Server callback that signals when a new packet transmit cannot be completed. You can use this as a marker to know whether the previous packet was sent.

One more thing that I need to mention is that the ATT notification does not guarantee you that the packet was received by the peer. If you also want this information, the ATT Indication is a more suitable option, with the drawback of reduced throughput.

Hope this helps!

[kyleyang]

Hi,

Yes, idea is make sure that new package is transmit correct.

Do you mean the GATT Server callback is "App_GattServerCallback" or "BleApp_GattServerCallback"?

Could you describe more detail for me? Thanks.

Or give me a mail?

kyleyang@wtmec.com

[miguel_reyes]

Hello kyleyang​,

Please refer to document BLEADG.pdf included in the KW40Z Connectivity Software package. See section 5.2 Server APIs to get more information about indications and notifications and how to use it in NXP BLE stack.

You should find the document in the next path:

<KW40Z_connSw_install_dir>\ConnSw\doc\BLEDAUG.pdf

Please, let us know if something is not clear in the document.