Getting multiple PM_EVT_PEER_DATA_UPDATE_SUCCEEDED events

[Ingfu]

Hello,

I am using peer manager to handle security and bonding. Everythin works fine (bonding witth MITM).

However, when a known peer connects, I am getting 6 (six) PM_EVT_PEER_DATA_UPDATE_SUCCEEDED events. Why is an update neccessary, when a known peer connects and why are six updates neccessary? As I store other information in flash, I have conerns about too many write operations.

This is my debug log:

APP:INFO:Connected to a previously bonded device.
APP:INFO:pm_evt_handler : 13
APP:INFO:pm_evt_handler : 1
APP:INFO:pm_evt_handler : 2
APP:INFO:Connection secured: role: 1, conn_handle: 0x0, procedure: 0.
APP:INFO:pm_evt_handler : 7
:INFO:FDS_EVT_UPDATE result: 0
APP:INFO:pm_evt_handler : 7
APP:INFO:pm_evt_handler : 7
:INFO:FDS_EVT_UPDATE result: 0
APP:INFO:pm_evt_handler : 7
APP:INFO:pm_evt_handler : 7
:INFO:FDS_EVT_UPDATE result: 0
APP:INFO:pm_evt_handler : 7

We are on SDK V13.1.0 by the way.

Cheers

[Kenneth]

Hi,

There is mechanism in FDS that ensure that data updates are spread over the entire flash pages (after a while you may need to do a garbage collection due to this), thereby you avoid that frequent updates can wear out flash. That said, to find what may be causing PM_EVT_PEER_DATA_UPDATE_SUCCEEDED you need to provide an on-air sniffer log. I suspect the peer may be enabling CCCD (notifications).

Best regards,
Kenneth

[Ingfu]

You are right, I wasn't aware of the fact, that  CCCD settings are to be persistent. However, I find it slightly unsatisfactory, that the peer manager updates CCCD settings, even if they don't change.

Regards