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NRF51422 Bluetooth: Long time between send and receive from message

Fabrice

Hello together,

I' am working on a Bluetooth application and have a problem with the transmitting time of the Bluetooth.

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In this Screenshot you can see the end of my command which i want to send from my NRF422 to my NRF422 Dongle. The second peak from the Debug pin indicates the send of the "Request Transfer" for the Bluetooth message. The Buffering just takes 0.26ms.

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In this image I receive and Send my Bluetooth message via UART. (second peak debug pin). The message i received is exactly the same i sent and it is working every time. The Time for the Buffering is just 0.41ms.

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Now my Problem: The Time in between send and receive is about 160ms and that's to long. Does someboy has experience with the Bluetooth Stack and knows what could cause the problem?

Thank you.

Best regards,

Fabrice

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    Hi Fabrice, it's little hard to follow your explanation. What exactly you mean by "Request Transfer for Bluetooth message"? What do you mean by "Buffering takes only XY ms" (who is buffering what and why)? Does it mean that you transfer some message over wired UART interface (at what speed? You can go from few kilobits per second up to one megabit...) and then you expect that transfer over BLE will take the same? On what BLE layer you communication (directly on link layer with custom PDU structure or you use "full" stack up to GATT Server/Client roles)? Assuming your data transfer is connection based what connection parameters (mainly connection interval) do your master (GAP Central?) device use and how many PDUs (MTUs if you use GATT) you transfer? Can you employ Nordic's BLE sniffer or something similar? Cheers Jan

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    Hi Fabrice, it's little hard to follow your explanation. What exactly you mean by "Request Transfer for Bluetooth message"? What do you mean by "Buffering takes only XY ms" (who is buffering what and why)? Does it mean that you transfer some message over wired UART interface (at what speed? You can go from few kilobits per second up to one megabit...) and then you expect that transfer over BLE will take the same? On what BLE layer you communication (directly on link layer with custom PDU structure or you use "full" stack up to GATT Server/Client roles)? Assuming your data transfer is connection based what connection parameters (mainly connection interval) do your master (GAP Central?) device use and how many PDUs (MTUs if you use GATT) you transfer? Can you employ Nordic's BLE sniffer or something similar? Cheers Jan

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