Updates for LQI and RSSI information in the coordinator

[MartinPersson]

Hello.

How often are the LQI and RSSI values in the coordinator updated for a child?

Preferably I would have liked to get some kind of notification every time LQI and RSSI are updated but if that's not possible I guess I will have to poll it with zb_zdo_get_diag_data(). In that case the question is how often it's relevant to call it for an update? Will the ordinary polling from the child update LQI and RSSI internally in zBoss or are those values only updated when there's an actual data transfer?

Speaking of child poll, is it possible to get any information about how long time ago a child polled the coordinator?

Our zBoss version is 3.11.1.5. I know it's old, but it would be kind of inconvenient to update right now.

Regards

/Martin

[Maria Gilje]

Hi Martin,

How often are the LQI and RSSI values in the coordinator updated for a child?

Will the ordinary polling from the child update LQI and RSSI internally in zBoss or are those values only updated when there's an actual data transfer?

I was not able to double check this, but since the RSSI and LQI are characteristics of a link and the signal strength, it is plausible that the neighbor table is updated regardless of there being data transferred. This information seems like it should be available in the specification, but unfortunately I did not have the chance to find out today. 

In that case the question is how often it's relevant to call it for an update?

This will depend on the polling rate for the child. 

Just to let you know, I'll be out of office tomorrow. I have asked my colleague to keep an eye on this ticket, but if she's not able to I'll get back to you on Monday. 

Best regards,

Maria

[MartinPersson]

I tried to simply call zb_zdo_get_diag_data() from a timer and print out the data but unfortunately it seems the LQI/RSSI values aren't updated unless there's active communication. Just the background polling doesn't seem to update the values.

Might this behaviour be different in later releases of zBoss?

An answer on Monday is ok. Have a nice weekend.

/M