nRF9160 SLM behaviour

RE: nRF9160 SLM behaviour

isurki — Wed, 19 Mar 2025 16:10:53 GMT

Hi Maria,

Sorry for the delay in my answer. The problem ended up being the MQTT keepalive parameter set to 300 seconds. Thank you for your support the "%PERIODICSEARCHCONF" command is very interesting, we will take it into account for sure.

Regards.

RE: nRF9160 SLM behaviour

Maria Gilje — Tue, 11 Mar 2025 12:50:15 GMT

Hey Ander,

[quote user=""]Besides, the current consumption from Power Profiler shows a behaviour I can not explain, with a current consumption of about 30 mA and ∼ 20 seconds every 5 minutes exactly. If PSM is disabled what is the source of the current consumptions shown in red in the picture?[/quote]

I wonder if the periodic high consumption can be the device doing a periodic search. With AT%PERIODICSEARCHCONF, periodic searches during limited service can be configured. In the linked documentation there are some examples for ultra low power configurations.

[quote user="isurki"]The modem firmware version is 2.6.1-lte-11b6ed4846a8. [/quote]

This seems to be the nRF Connect SDK version. I was thinking about the firmware binaries with a name on the form mfw_nrf9160_x.x.x.zip which are provided as downloads here. I may be missing some information, so feel free to enlighten me.

[quote user="isurki"]Could we use the JTAG port to enable modem trace?[/quote]

You can use RTT as a backend for modem trace, but it is an experimental feature and it requires a debugger (either dedicated or a DK with an onboard debuger). It is also possible to create custom backends.

[quote user="isurki"] Is the modem trace necessary for you?[/quote]

Not at this point. I'll let you know if I find we need one.

Best regards,

Maria

RE: nRF9160 SLM behaviour

isurki — Tue, 11 Mar 2025 10:35:33 GMT

Hi,

I don't have modem trace enabled as the hardware is a custom board and we are using UART0 to communicate with the main MCU of the board. Is the modem trace necessary for you? Could we use the JTAG port to enable modem trace? The modem firmware version is 2.6.1-lte-11b6ed4846a8.

Regards,

Ander.

RE: nRF9160 SLM behaviour

Maria Gilje — Tue, 11 Mar 2025 09:10:24 GMT

Hello,

Do you have a modem trace of this situation? Also, which Modem FW version are you using?

Best regards,

Maria