nRF9160 in low power

[Neculai Agavriloaie]

Hi,

I'm using the mqtt_simple example to develop a new application.

I want you to tell me what lines of code I need to add for the nRF9160 to work in the minimum power consumption mode.

Thank You!

Neculai

[Håkon Alseth]

Hi,

 

First, you want to disable the serial interface, as this adds approx. 600 uA to the sleep current.

This is done by creating the folder "child_image" and file spm.conf within this folder.

That child_image\spm.conf shall hold:

CONFIG_SERIAL=n

 

The same configuration should also be added to the prj.conf:

CONFIG_SERIAL=n

 

For entering eDRX or PSM, you will need to change one of these to "true":

https://github.com/nrfconnect/sdk-nrf/blob/v1.9.1/samples/nrf9160/mqtt_simple/src/main.c#L535-L536

 

And setup your wanted edrx or PSM intervals.

 

Here's a current example of a initial connection and the nRF eventually entering PSM:

 

Kind regards,

Håkon