Thingy91X - Wake from System OFF

RE: Thingy91X - Wake from System OFF

andychess — Wed, 04 Feb 2026 12:03:57 GMT

Hi Marte,

That worked perfectly. Thank you :-).

Kind regards,

Andy

RE: Thingy91X - Wake from System OFF

Marte Myrvold — Mon, 02 Feb 2026 11:59:49 GMT

Hi,

Thank you for clarifying.

[quote user="andychess"]If the shutdown routine included in the sample I posted, requires additional steps to shutdown and or start the RPC, please let me know, so that we can test further. [/quote]

Shutting down the Wi-Fi interface before entering system off should fix the issue:

You can shut down the Wi-Fi interface with net_if_down():

int shutdown_wifi()
{
	int ret;
  struct net_if *iface = net_if_get_default();

	if (!net_if_is_admin_up(iface)) {
		return 0;
	}

	ret = net_if_down(iface);
	if (ret) {
		LOG_ERR("Cannot bring down iface (%d)", ret);
		return ret;
	}

	LOG_INF("Interface down");

	return 0;
}

Then call this function before NRF_REGULATORS->SYSTEMOFF = 1.

Make sure to include the net_if file so that you can use net_if_down():

#include <zephyr/net/net_if.h>

Best regards,
Marte

RE: Thingy91X - Wake from System OFF

andychess — Mon, 02 Feb 2026 08:15:54 GMT

I might has expressed that badly. The test unit isn't able to use system off at all, because of the wakeup problems which are the subject of the ticket. We have a second Thingy 91X, field trialling a different firmware, which doesn't feature WiFi and this shuts down and starts as expected.

If the shutdown routine included in the sample I posted, requires additional steps to shutdown and or start the RPC, please let me know, so that we can test further.

RE: Thingy91X - Wake from System OFF

Marte Myrvold — Fri, 30 Jan 2026 09:29:05 GMT

Hi,

[quote user="andychess"]We deployed a first Thingy, using WiFi locating, to field trials in the UK last week and the battery is only lasting for 7 days without a full shutdown. [/quote]

Is this using system OFF and has the RPU enable failed error? The Wi-Fi interface should shut down between scans when using the location library.

Do you get the RPU enable failed error if you shut down the Wi-Fi interface before going into system off?

Best regards,
Marte

RE: Thingy91X - Wake from System OFF

Marte Myrvold — Tue, 27 Jan 2026 15:57:56 GMT

Hi,

I have asked about it internally, and I am waiting for a response.

Best regards,
Marte

RE: Thingy91X - Wake from System OFF

andychess — Tue, 27 Jan 2026 08:31:13 GMT

Hi Marte,

Can you give me any update on this? We deployed a first Thingy, using WiFi locating, to field trials in the UK last week and the battery is only lasting for 7 days without a full shutdown.

We have a second design in the lab that doesn't require WiFi location finding and this is sleeping quite happily at 1.8uA, which was much closer to our expectation.

Best regards,

Andy

RE: Thingy91X - Wake from System OFF

Marte Myrvold — Mon, 19 Jan 2026 14:15:23 GMT

Hi,

I can reproduce the issue on my side. It seems like there might be a timing issue with the startup sequence. I will look more into this and get back to you.

Best regards,
Marte

RE: Thingy91X - Wake from System OFF

andychess — Wed, 14 Jan 2026 12:20:45 GMT

RE: Thingy91X - Wake from System OFF

andychess — Wed, 14 Jan 2026 12:19:34 GMT

Hi Marte,

Please find the bare-bones project attached. You should see the error immediately. Please note, that after building without the sysbuild.conf, the sample works without errors.devzone.nordicsemi.com/.../thingy91x_5F00_lab.zip

RE: Thingy91X - Wake from System OFF

Marte Myrvold — Wed, 14 Jan 2026 10:23:50 GMT

Hi,

Can you share your code with me so I can try to reproduce the issue? Upload the project as a zip file without the build folder. If you do not want to upload the project to a public ticket, let me know, and I can make it private.

Best regards,
Marte