Delete child on ZigBee coordinator

[abe]

Hello, I developed for my customer, a ZigBee coordinator in last 2019, using nRF5 SDK for Thread and Zigbee v3.2.0.
Now it needs to add a function for deleting a "child node" network entry stored into Coordinator (I think inside FDS storage).
In other words, if one end device fails and will not recoverable, how can I delete his network datas stored inside Coordinator and make this space free for a new device?
I limited the max number of device to 10 and if one fails is mandatory for me to remove his entry.
Thanks for help

Abele

[Marte Myrvold]

Hi Abele,

The only way for the neighbor table entry of a child node to be deleted in the case where the child node fails is by the end device keepalive to timeout. In this case I would recommend setting the end device timeout shorter if possible, since this is exactly what the timeout is for.

Best regards,

Marte

[abe]

Hi Marte,
the timeout expire delete also the Node data stored by ZigBee stack into NVRAM Flash space?
I tried to power off my SED door sensor (removing battery) and leave it powered off for some days, and after this time I reinserted the battery to power on the SED node, and is it full working: it sends correctly the status change to Coordinator that make all the provided actions (when door opens or closes)

Abele

[Marte Myrvold]

Hi Abele,

Yes, the device will be removed such that it does not take up the space for another device.

The reason the SED was able to join after being powered off for multiple days was because the SED itself had the network data stored in NVRAM, so it could rejoin with the previously stored network data.

Best regards,

Marte

[abe]

Ok, thanks for the explain.
Then, to best understand, as SED end nodes awakes (even after they are deleted on Coordinator NVRAM tables) and try to connect the network, the Coordinator rejoin the node and update his NVRAM reserving a new space inside his NVRAM table. It's rigth?

Please, note that SED end nodes are Heiman Door Sensor, Motions sensor and so on battery powered and belonging to IAS zone.

Regards 

Abele

[Marte Myrvold]

Hi Abele,

If the SED has been commissioned to the network before, and still has the network data stored, such as the network key, then yes.

Best regards,

Marte