How to set BLE connection event length extension?

RE: How to set BLE connection event length extension?

Amanda Hsieh — Mon, 29 Nov 2021 12:08:18 GMT

Hi,

1. Yes, NRF_SDH_BLE_GAP_EVENT_LENGTH is the time set aside for this connection on every connection interval in 1.25 ms units. 6x1.25ms=7.5ms

2. Yes.

-Amanda

RE: How to set BLE connection event length extension?

ReedLi — Mon, 29 Nov 2021 09:02:12 GMT

Hi,

1. For example, if i want to set connect event length 7.5ms, should central and peripherals all set NRF_SDH_BLE_GAP_EVENT_LENGTH 6？

2. If central and peripheral all need to call conn_evt_len_ext_set() to allow extend connect event length.

RE: How to set BLE connection event length extension?

Amanda Hsieh — Mon, 29 Nov 2021 08:51:19 GMT

Hi,

1. When adjusting the define NRF_SDH_BLE_GAP_EVENT_LENGTH, you will extend the amount of data that the peripheral can send, but this might still be restricted by the central side.

2. Yes. You could use this conn_evt_len_ext_set function

void conn_evt_len_ext_set(void)
{
    ret_code_t err_code;
    ble_opt_t  opt;

    memset(&opt, 0x00, sizeof(opt));
    opt.common_opt.conn_evt_ext.enable = 1;

    err_code = sd_ble_opt_set(BLE_COMMON_OPT_CONN_EVT_EXT, &opt);
    APP_ERROR_CHECK(err_code);
}

and call it after ble_stack_init() in main() to enable extended BLE connection events.

Regards,
Amanda