connection interval & gap event length

[hrms]

I am trying to connect two peripherals to one central.
I do not understand the settings for connection interval and gap event length.

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(20, UNIT_1_25_MS)

For example, this would result in a connection interval of 20ms.

#define NRF_SDH_BLE_GAP_EVENT_LENGTH 6

For example, at this time, what is the unit of the gap event length? Assuming a connection interval of 20 ms, will the radio use time be 6 ms?

[Jimmy Wong]

You can find the answer at 
https://jimmywongiot.com/2019/12/15/how-to-set-the-bandwidth-on-ble-link-connection/

[hrms]

In other words, is (GAP EVENT LENGTH) * 1.25 the time when radio can be used?

Is this a same setting for Central and Peripheral? Or can it be set independently?
Can I always receive if I set it to 100%?

[Jimmy Wong]

 is (GAP EVENT LENGTH) * 1.25 the time when radio can be used? Yes,

You can configure on both side to use same value.  

[hrms]

Thank you.

Which value adjusts if different values are set?

[Jimmy Wong]

it is purely depended on your application.

You should need to know what the meaning of gap event length is.

and then you can adjust the connection interval and gat event length .

if you need to  have a longer range and higher throughout, you should use shorter connection interval because more often retry / retransmission.