How to use PSM and eDRX mode in custom code?

RE: How to use PSM and eDRX mode in custom code?

Håkon Alseth — Wed, 25 Sep 2019 08:18:48 GMT

[quote user="shital"]- Is it possible to test PSM / eDRX mode without the network ?[/quote]

You will need to have M1 or NB-IoT coverage to run tests.

[quote user="shital"]- If the network is available, please suggest me a way/setup to cross check that the device is in PSM/eDRX mode?[/quote]

If a network is available, you can test PSM by requesting this in AT command CPSMS, and then reading the parameters for the link by entering "AT+CEREG=5" and "AT+CEREG?" to read the parameters that the network has set.

For eDRX, you set via this AT command:

https://infocenter.nordicsemi.com/topic/ref_at_commands/REF/at_commands/nw_service/cedrxs_set.html?cp=2_1_6_2_0

And read the parameters that the network set via:

https://infocenter.nordicsemi.com/topic/ref_at_commands/REF/at_commands/nw_service/cedrxrdp_set.html?cp=2_1_6_3_0

AT commands can be issued and read when you run the sample "at_client" in NCS.

Kind regards,

Håkon

RE: How to use PSM and eDRX mode in custom code?

shital — Wed, 25 Sep 2019 07:22:42 GMT

Hi,

Thanks for contributing with solution.

We tried PSM and eDRX APIs in our customized code (from the scratch) by modifing prj.conf file, as suggested by you. It compiles good without warning and error.

Now I am curios to test the PSM / eDRX modes, but my city doesn't have LTE Cat-M1 / NB-IoT network.

- Is it possible to test PSM / eDRX mode without the network ?
Please suggest me a way, if it is possible.

- If the network is available, please suggest me a way/setup to cross check that the device is in PSM/eDRX mode?

Thank You,
Shital

RE: How to use PSM and eDRX mode in custom code?

Håkon Alseth — Mon, 23 Sep 2019 12:26:24 GMT

Hi,

These settings can be found in the lte_lc module, and here's the setting for requesting edrx:

https://github.com/NordicPlayground/fw-nrfconnect-nrf/blob/master/drivers/lte_link_control/Kconfig#L70

If you want this specific setting in your project, you add "CONFIG_<name of the entry>=y" to your prj.conf.

For instance:

CONFIG_LTE_EDRX_REQ=y

Similar for PSM, where you can choose to enable this in the background at bootup, via lte_lc driver, or you can call it from the application via "lte_lc_psm_req()".

Here's an example that does that: https://github.com/Rallare/fw-nrfconnect-nrf/blob/nrf9160_samples/samples/nrf9160/udp_with_psm/src/main.c#L112

Where the PSM timing parameters are set in the prj.conf: https://github.com/Rallare/fw-nrfconnect-nrf/blob/nrf9160_samples/samples/nrf9160/udp_with_psm/prj.conf#L25

Kind regards,

Håkon