nRF9160 DK sleep current too high after opening and closing a TCP socket

[Thomas]

Hi,

Similar to https://devzone.nordicsemi.com/f/nordic-q-a/45544/nrf9160-dk-psm-current-too-high-after-opening-and-closing-a-tcp-socket/260026#260026, however they said that issue has already been fixed and to make a new post.

After opening, connecting and closing a TCP socket and powering down the modem (either AT+CFUN=4 or  AT+CFUN=0), the device wakes every 1.2 seconds which raises the sleep current by an average of 20uA...

Below is a capture of the device sleeping (~6uA), then registering, opening a socket to Google, closing the socket and powering off, then waking every second. I found that it stops waking every second after a few minutes?

I'm using version 1.2 of the modem. I've also included a simple sample as well:

1234.tcpOpenClose.zip

Note: The sample use RTT as the debug interface not the UART.

[Sigurd]

Hi,

Thanks for reporting this. I will check the behavior with the Nordic modem firmware team.

[Thomas]

Hi Sigurd,

Is there any update on this?

Kind regards,

Thomas

[Thomas]

Sigurd?

[Hakon]

Sigurd is on vacation till August 10th. The modem team is currently working on your case, but the progress is slow as a lot of the staff is on vacation these days.

[Thomas]

Thanks for the update Hakon