RE: Small throughput in nrf52-ble-app-uart-c-multilink

Kenneth — Thu, 11 Mar 2021 13:00:18 GMT

Hi,

I recommend to first check out these two pages if you haven't already:
https://infocenter.nordicsemi.com/topic/sds_s140/SDS/s1xx/multilink_scheduling/central_connection_timing.html
https://www.novelbits.io/bluetooth-5-speed-maximum-throughput/

To update the queue size you should follow the code example you can find at the bottom of this reply, this will add a few more lines to nrf_sdh_ble_default_cfg_set() to update the hvn_tx_queue_size:
https://devzone.nordicsemi.com/f/nordic-q-a/64837/change-queue-length-of-handle-value-notifications-sdk-15-3-0/265091#265091

If you still have problems, I suggest you also look at the scan parameters you are using while maintaining a central link(s). The scan parameters can affect the central link(s). For instance try to set NRF_BLE_SCAN_SCAN_INTERVAL and NRF_BLE_SCAN_SCAN_WINDOW both to 8 (=5ms), which should schedule scanning between active links.

Kenneth