How to get RSSI of an OpenThread sleepy end device

[kaushalyasat]

Hi,

I have a set of OpenThread CoAP clients configured as speepy end devices to preserve battery. I need to obtain RSSI values of each of the CoAP clients. From CoAP server I can use CLI to query 'ot child n' to get RSSI value of the connected child nodes. I am going through the CLI files  to detect how this is done via CLI, but it seems a lengthy process.

How can I retrieve the RSSI values from CoAP server API? (i.e. without going through the CLI)

Cheers,

Kaushalya

[kaushalyasat]

I tried 

RSSI = otLinkRawGetRssi (openthread_get_default_instance());

but resulted in a compile error saying 'undefined reference to `otLinkRawGetRssi'. I found the function defined in 'C:\ncs\v2.0.0\modules\lib\openthread\src\core\api\link_raw_api.cpp'. But the function is not included in the build because  

#if OPENTHREAD_RADIO || OPENTHREAD_CONFIG_LINK_RAW_ENABLE

{...

}

So apparently none of these symbols are defined anywhere. 

I tried defining these symbols in prj.conf, but resulted in a config error. So these are not build config flags it seems.

I found them in  'C:\ncs\v2.0.0\modules\lib\openthread\src\ncp\ncp_config.h', but when I try to include this in my source, the file path cannot be resolved. 

I tried '#include "C:\ncs\v2.0.0\modules\lib\openthread\src\ncp\ncp_config.h"', then is could be located, but even after #defineing the symbols, the 'otLinkRawGetRssi' seems not enabled.

I am out of ideas now. Some light??

[Sigurd Hellesvik]

kaushalyasat said:

Thanks, but isnt this function meant to be executed from the leader? What I need is a way to read the child's own RSSI data, from the child itself. 

Ah, I misunderstood.

How about otThreadGetParentLastRssi()?

Regards,
Sigurd Hellesvik

[kaushalyasat]

Hi Sigurd, Brilliant. That solved my issue. I guess this is not an averaged RSSI, but that is ok for us. 

Thanks again.

Kaushalya

[Sigurd Hellesvik]

kaushalyasat said:

I guess this is not an averaged RSSI

Then maybe otThreadGetParentAverageRssi() is what you need?

Regards,
Sigurd Hellesvik