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Nordic Case Info
  • Case ID: 338054
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How can I count the number of packets sent and received in the bt_gatt_write() operation?

Higo

I have an application where I use the bt_gatt_write() method and I would like to obtain information about the number of packets sent in my operations.

I would like to know how many packets it sent, and if it needed to send more than once to receive confirmation of receipt from the other end.

I would also like to obtain the PRR (Packet Reception Rate) on the node that receives the write.

  • 0

    Hi,

    This sounds a bit like it could be a XY Problem.
    Can you explain the issue you are trying to fix by counting packets?

    Regards,
    Sigurd Hellesvik

  • 0 in reply to Sigurd Hellesvik

    Hi Sigurd Hellesvik, I'll share my problem with more details.

    1)
    I'm believed that in environments with many noises or if the central and peripheral stay between a big distance, there possible there lost information. But as the bt_gatt_write() send information until receiving the confirmation from peripheral, in this scenario, the central can need send many times to have certainty that peripheral receiving the message.
    I would like measure the rate of send and received to define the quality of communication. I could measure the rate of loss rate or reception rate.

    2)
    When establishes the communication with data length 27Bytes (4.0) but I send 30Bytes, this information need break in 2 parts. I would like count this number of package the technology needed to send. Same situation if have data length 251Bytes and I send 300Bytes.

    Purpose
    I created the application from example UART service provided by nordic, to assess the different scenarios and environment the communication. Now I would like to find the parameters cited in 1 and 2.

    Thanks

  • 0 in reply to Higo

    We do provide the Bluetooth Low Energy nRF Sniffer for Bluetooth LE. With this you can inspect Bluetooth traffic live on the air.

    It sounds to me like your use-case do not need to be done all the time, but for to inspect communication once and then make some choices, right?
    In this case, can I suggest the sniffer?

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