About "ble_gap_conn_cfg_t :: event_length"

SDK: 15.3.0
SoftDevice: S132
Device: EYSHJNZWZ (nRF52832)

Please tell me about "ble_gap_conn_cfg_t :: event_length".
The following explanation is written in the manual.

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.api.v6.1.1/structble__gap__conn__cfg__t.html

The time set aside for this connection on every connection interval in 1.25 ms units.
The default value is BLE_GAP_EVENT_LENGTH_DEFAULT, the minimum value is BLE_GAP_EVENT_LENGTH_MIN. 
The event length and the connection interval are the primary parameters for setting the throughput of a connection. 
See the SoftDevice Specification for details on throughput.

I don't know what this means.
Where should I look in the SoftDevice Specification?

0 Hung Bui over 4 years ago

Hi Takashina,

The event length is the period of time that the softdevice dedicated to serve a connection. The softdevice handles multiple connection at the same time. Each connection has its own connection interval. To be able to simultaneously server multiple connection with different bandwidth/priority the softdevice need to limit the time it serve each connection by using event length.
The event length can be smaller than the connection interval and will decide how much data can be exchanged in each connection interval.
You can read more about the event length at section 10.4 in Bluetooth Low Energy role configuration in the softdevice specification here.
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