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NRF52840 BLE transfer using NUS service

pranavsk1994

image descriptionI am writing an application for sending data received over SPI from a non-nordic chip to nrf52840 to nrf uart app using NUS service. I am using 20 bytes of a packet size the max in NUS. The SPI sampling happens at 4 MHZ. I am receiving a very low throughput of around 2.88kbps. Can anyone guide me how to change BLE setting to maximize the throughput

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    Hi Pranav,

    You need to queue as much as possible using the sd_ble_gatts_hvx() command (what inside ble_nus_string_send) until you receive NRF_ERROR_RESOURCES meaning all the buffer is queued. And then after that you wait for the BLE_GATTS_EVT_HVN_TX_COMPLETE event telling that there are some packets sent, and the buffer is free, then you can queue again using hvx command.

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    Hi Pranav,

    You need to queue as much as possible using the sd_ble_gatts_hvx() command (what inside ble_nus_string_send) until you receive NRF_ERROR_RESOURCES meaning all the buffer is queued. And then after that you wait for the BLE_GATTS_EVT_HVN_TX_COMPLETE event telling that there are some packets sent, and the buffer is free, then you can queue again using hvx command.

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