The NRF_SDH_BLE_GAP_EVENT_LENGTH in ble_app_att_mtu_throughput example

[Den]

Hi,

I am trying to understand how the connection parameters and settings work and how they change the throughput. For this sake, I have been experimenting with the ble_app_att_mtu_throughput example which I found quite helpful. However there is something that I am still having hard time to understand. 

As far as I understood, NRF_SDH_BLE_GAP_EVENT_LENGTH denotes the Connection Event (the duration of time that is reserved for transmitting and receiving packets in each Connection Interval). Is this right? If so, NRF_SDH_BLE_GAP_EVENT_LENGTH  by any means cannot be longer than the Connection Interval itself. Yet, in the example when I type in the "config print" command, the given values for these parameters are;

Connection interval: 6 units

GAP event length: 400 

And the code works fine..

Have I misunderstood something?

 

Thanks,

Den

[haakonsh]

You have understood it perfectly. 

The SoftDevice will accept values larger than the connection interval, but it will not actually extend the connection event beyond the connection interval, it will store the value an use it in case the connection interval changes. 

It is perfectly safe to use large values for this parameter.

[Den]

Thanks for the clarification Haakonsh

[nimgin]

Hi haakonsh,

    If i set NRF_SDH_BLE_GAP_EVENT_LENGTH 400 ,

    and edit my target as below(from the ble_app_att_mtu_throughput example):

   

• Is that  right ? Is there anything else to do?

Hoping for a solution!

Thanks,