Peripheral syncing every connection interval even after SLAVE_LATENCY

[beemavishnu]

Hello,

 

I am using nRF52832, SDK_15.3.0, S132 SoftDevice and Segger for flashing the image. I am using ‘ble_app_blinky’ and “nRF Connect” app.

To save battery, I want to increase the SLAVE_LATENCY.

 

1) In ble_app_blinky’ I just changed SLAVE_LATENCY to 5 and remaining settings are kept as is.

    But still in sniffer I am seeing peripheral syncing to every connection interval.

 

2) Even there is no “Connection_Parm_Update request” from Peripheral to Central. Only in “Connection_Request” and “LL_Connect_Update_Req” from "Master to Slave" I am seeing Latency with 0.

 

Are there any other settings to be changed so that peripheral can skip 5 connection intervals.

 

Thanks & Regards

Vishnu Beema

[Sigurd]

Hi,

Could you upload the sniffer log ?

[beemavishnu]

Please find attached TI sniffer log. I just changed SLAVE_LATENCY to 5 in ble_app_blinky application.

Sync_every_Connection_event.psd

Thanks & Regards

Vishnu Beema

[Sigurd]

beemavishnu said:

But still in sniffer I am seeing peripheral syncing to every connection interval.

It takes some time before the connection param update reqeust is sent, but it takes effect after that. You see at the end of the sniffer log that the slave is only responding to every 5th packet. (You see the ACK status from M->S is "RETRY" for 5 packets, and then the slave responds).

beemavishnu said:

Even there is no “Connection_Parm_Update request”

Yes, there is. It's packet number 1130 in the log.

[beemavishnu]

Thank you for confirmation & sorry for overlooking. I was looking during initial phase of connection.