BLE GATT statistic somehow?

[rgrr2]

Hello,

currently tampering around with "how to find out state of BLE TX FIFO", see e.g.  bt_gatt_write_without_response_cb / bt_gatt_notify: how to prevent blocking

Next idea: is there any way to access BLE transmission/reception statistics?  So one could tell, that if there is a packet loss of e.g. 10%, the transmission FIFO should be loaded only with 90%.

Thanks & regards

Hardy

[Sigurd]

Hi!

Yes, with SDC you can get access to some data on this.

Number of packets received with good/bad CRC during the connection event, and nak_count and rx_timeout. See e.g. this link.

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrfxlib/softdevice_controller/doc/api.html#structsdc__hci__subevent__vs__qos__conn__event__report__t

e.g. the llpm samples shows how to get e.g. crc mismatches. https://github.com/nrfconnect/sdk-nrf/blob/main/samples/bluetooth/llpm/src/main.c

[rgrr2]

Hello,

thanks for the suggestion.

I guess for my application is sdc_hci_event_number_of_completed_packets_t the way to go.  Any examples on that?

[Sigurd]

rgrr2 said:

I guess for my application is sdc_hci_event_number_of_completed_packets_t the way to go.  Any examples on that?

No... this event is not supposed to be used directly by the Application layer. It's an HCI event between Bluetooth Controller and Bluetooth Host.

[rgrr2]

But the other event mentioned is catchable?

[Sigurd]

Yes