ble_gap_data_length_params_t range

[Youssif]

Hi

We are trying to port our app from softdevice v3.0.0 to softdevice v5.0.0. We note that the data length and bandwidth configuration procedure has changed drastically, including the introduction of the sd_ble_gap_data_length_update() function. My question is regarding the tx/rx time parameters of the function: what is the valid range for these parameters? Is this related to the packet length used? if so, what is the dependency?

I've tried following the migration document pseudo code, but the tx/rx time used there is BLE_GAP_DATA_LENGTH_AUTO. Is there any other source/description that we can follow?

We are using nrf52832, with softdevice S132 v5.0.0.

Thanks

[Petter Myhre]

I have looked a bit more into it. So as I mentioned max_rx_time_us and max_tx_time_us should be set to BLE_GAP_DATA_LENGTH_AUTO. max_rx_octets and max_tx_octets should be equal, and valid values are 27-251. If sd_ble_gap_data_length_update() returns 0x13 -> NRF_ERROR_RESOURCES, the limitation should be examined. If tx_rx_time_limited_us is 0, then you need to increase the max ATT MTU set when enabling the SoftDevice. If tx_rx_time_limited_us is not 0, then the event length should be increased with the specified number of us.