nRF9160-DK - sometimes busy for 1 minute before entering PSM

[Achim Kraus]

Using the nRF9160-DK together with the Power Profiler Kit 2, I observe sometimes a longer period (1 minute) of a 50mA consumption before entering PSM mode.

Is there a explanation for that? Could that behavior be "forecasted", or better disabled?

[JONATHAN LL]

Hi,

What modem firmware are you using and what nRF Connect SDK (NCS) version are you on?

Regards,
Jonathan

[Achim Kraus]

modem 1.3.2

NCS 2.0.1

nrf connect for desktop 3.11.1, power profiler app 3.4.3

Just to mention:

My logs with PSM wakeup and sleep are matching the power consumption indicated by the PPK2. So, I guess, it's something happening in the modem, not an issue of the PPK2.

[Achim Kraus]

It occurred again, now for more than 2 minutes!

[JONATHAN LL]

Hi,

If there is a data transfere ongoing then the device will no go in to PSM mode before it is done, even tough PSM is granted. So this can be the case, but we can not say for sure what is the reason without logs, so if you could provide a modem log then that would be great as we will then be able to see what is going on i more detail. 

Regards,
Jonathan

[Achim Kraus]

I will try it and we will see.

But I don't think, a pending transfer is the reason. At least not one, my application does. Using CoAP/DTLS CID is one message sent, one received and then the device may sleep again. I also don't see additional logging , which indicates, that something else happens.

Also to mention: if a transmission is ongoing (see the begin of the power chart), the consumption is much higher than 50mA.