How many paired informations can save in FDS?

RE: How many paired informations can save in FDS?

Ethan.jskim — Mon, 08 Apr 2024 22:59:55 GMT

Dear Vidar

I almost understood

I will close this ticket and thanks for your advice again.

Best regards.

Ethan.

RE: How many paired informations can save in FDS?

Vidar Berg — Mon, 08 Apr 2024 09:41:35 GMT

Hello Ethan,

You can use fds stat to check the flash usage before and after bonding to determine how much FDS space the bond occupies including overhead.

[quote user="Ethan.jskim"]so it is difficult to confirm the exact number of stored data in advance.[/quote]

The size of the bond information is the same for all bonds. The number of CCCDs is defined by your application.

[quote user="Ethan.jskim"]My question is whether the peer manager is configured to automatically purge previously stored data if there is no FDS storage size to store a new bonded (paired) device, or should I handle in my application code by API like pm_peer_delete()?[/quote]

Yes, as stated in the API doc, the lowest ranked peer(s) will be deleted:

Deletes the lowest ranked peer(s) when garbage collection is insufficient.

Best regards,

Vidar

RE: How many paired informations can save in FDS?

Ethan.jskim — Mon, 08 Apr 2024 09:06:39 GMT

Hello Vidar.

thank your for your quick advice.

My understanding is that each bonding data size depends on an attribute table containing CCCDs counts and I can monitor FDS usage by call to fds_stat.
if my understood is correct that means bonding data can be stored according to the remaining FDS size, which can be checked through fds_stat, so it is difficult to confirm the exact number of stored data in advance. Is that right?

About peer ranking,

My question is whether the peer manager is configured to automatically purge previously stored data if there is no FDS storage size to store a new bonded (paired) device, or should I handle in my application code by API like pm_peer_delete()?

BR.

Ethan.

RE: How many paired informations can save in FDS?

Vidar Berg — Mon, 08 Apr 2024 07:46:35 GMT

Hello,

The size of each bond entry depends also depends on the number of CCCDs you have in your attribute table. I recommend you monitor the FDS usage in your application by periodically calling fds_stat. Then you can determine exactly how much space a bond consumes in your application.

For Peer ranking, you can call pm_handler_flash_clean() from your PM callback. This function is used in the ble_app_hids_keyboard example.

Best regards,

Vidar