Whether is possible to change central event length via sd_ble_cfg_set() after sd_ble_enable() ?

Question

Hello, I am trying to switch from BLE_GAP_PHY_AUTO to BLE_GAP_PHY_CODED in runtime, and I need to change central event length via sd_ble_cfg_set(). Whether is it possible to do that after sd_ble_enable() ?

Einar Thorsrud · Accepted Answer

Hi, 
 VladK said: I have found that for. BLE_GAP_PHY_CODED I should use at least BLE_GAP_EVENT_LENGTH_CODED_PHY_MIN, but I am not sure whether I could keep it for BLE_GAP_PHY_AUTO as well or change it when switching PHY. 
 I see. There should not be any problem using the long event length with any PHY. Configuring longer event lengths means that the SoftDevice RAM usage increases since it needs larger buffers. Also, if you need high throughput, low latency or neither has consequences for choice of event length and connection interval, which are related (since the event must finish within the connection interval). Buth the length is anyway not that long, and you have not written anything about this. So I do not see any practical problems using at least BLE_GAP_EVENT_LENGTH_CODED_PHY_MIN regardless of which PHY is used.

Whether is possible to change central event length via sd_ble_cfg_set() after sd_ble_enable() ?

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