RE: BLE data rate issue - GATT write extremely slow

Kenneth — Wed, 04 Sep 2024 12:05:29 GMT

Hello,

Likely this is due to slave latency is > 0. Typically slave latency is updated during a connection parameter update, and to reduce current of the peripheral it can skip the number of intervals as defines by slave latency, this will in effect reduce the throughput from the central to the peripheral.

Either you need to update connection parameter, but there is also a command that you can call on the peripheral where it will still listen every connection interval even if slave latency is >0. This is:

int hci_vs_sdc_peripheral_latency_mode_set(const sdc_hci_cmd_vs_peripheral_latency_mode_set_t *params);

Documentation here: https://github.com/nrfconnect/sdk-nrfxlib/blob/main/softdevice_controller/include/sdc_hci_vs.h#L1184

Kenneth