Nrf9160 not setting requested active time

[PieterK]

Good day I am wondering if you can help me.

For background information.

Network - NB-iot

Firmware -  1.3.1

Software - Serial LTE Modem

Hardware - nrf9160dk

I am trying to set the requested active time down so that when I go into idle to save power and keep my IP connection that the modem doesn't stay active for 60 seconds there after.

The device is going into low power mode but only after 60 seconds. 

I will attach a screen shot of the AT-commands that I take to get to the point where I'd like to go into low power but the Requested Active Time does not change.

I came across this following link while attempting to get my power consumption down.

(+) turn off active time and go directly to power save mode - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

I tried the command AT+CPSMS=1,"","","10101010","00000000" to set the periodic TAU to 10 minutes and the requested active time to 0 and to 2 (00000001) seconds.

But they had no influence on the 60 seconds of high power consumption after issuing the AT#XSLEEP=2 to put the system into idle.

If anyone has any input as to where I am going wrong I will greatly appreciate it.

[Albrecht Markus Schellenberger]

Hello Pieter,

PieterK said:

We are just looking for a way to make the device go into idle (Keeping the IP connection) without having to wait 60 seconds after for the device to go into low power

My bad! Looking one more time at the time stamps, I now see that there is a 60s delay between:

(11:00:12.926) +CEREG: 1,"5209","09A53917",9,,,"00000000","10010100"

and

(11:01:13.267) %CESQ: 255,0,255,0

My apologies for overlooking that!

I actually might need a modem trace here to get some more details around what the modem is reporting internally. You can follow this guide to do so, but I would recommend you to use Trace Collector V2 preview instead.

Thanks & regards,

Markus