Enabling eDRX or PSM Mode with iot.1nce.net sim

RE: Enabling eDRX or PSM Mode with iot.1nce.net sim

Adeel — Mon, 16 Nov 2020 14:41:06 GMT

Hi Hakon,

Thanks for that clarification. I assumed that its not possible to send or receive anything during the PSM interval.

I will try this configuration out with the mqtt_simple example again and update you 🙂.

My application is basically to receive sensor data value every minute and send it out via MQTT every 10 minutes. I hope both the receiving and sending tasks are possible in the PSM mode as well then.

Regards,

Adeel.

RE: Enabling eDRX or PSM Mode with iot.1nce.net sim

Håkon Alseth — Mon, 16 Nov 2020 14:34:02 GMT

Hi,

[quote user="Adeel"]Oh great, So you mean I can keep the CONFIG_MQTT_KEEPALIVE = 600 so that I can come out of PSM every 10 mins and send the data ?[/quote]

The meaning behind both eDRX and PSM is to poll for data, ie. a application requirement to receive something from the network (SMS, IP, or anything at all) in a given interval.

If your application is transmission based (the NRF drives the dataflow), you can just set the PSM (or EDRX) interval really high; and trigger a send() function from your application at-will.

[quote user="Adeel"]Does it automatically go back to PSM mode again as that is what I want to do.[/quote]

Yes, it will automatically go back to PSM.

Kind regards,

Håkon

RE: Enabling eDRX or PSM Mode with iot.1nce.net sim

Adeel — Mon, 16 Nov 2020 14:29:45 GMT

Hi Hakon,

Yes, I am using MQTT to send out my sensor data.

Oh great, So you mean I can keep the CONFIG_MQTT_KEEPALIVE = 600 so that I can come out of PSM every 10 mins and send the data ?

Does it automatically go back to PSM mode again as that is what I want to do.

Regards,

Adeel.

RE: Enabling eDRX or PSM Mode with iot.1nce.net sim

Håkon Alseth — Mon, 16 Nov 2020 14:18:53 GMT

Hi Adeel,

PSM usually has a lower limit, and in your network it seems to be 60 minutes.

If you're using mqtt, you can set the CONFIG_MQTT_KEEPALIVE equal to your polling interval if you want to poll more often.

This will then make the nRF go out of PSM before the TAU has expired, and automatically re-negotiate PSM afterwards.

Kind regards,

Håkon

RE: Enabling eDRX or PSM Mode with iot.1nce.net sim

Adeel — Mon, 16 Nov 2020 13:39:24 GMT

Hi Hakon,

Thanks for the explanation. So I am a bit network dependent here to obtain my exact values.

Regards,

Adeel.

RE: Enabling eDRX or PSM Mode with iot.1nce.net sim

Håkon Alseth — Mon, 16 Nov 2020 09:25:41 GMT

Hi,

[quote user="Adeel"]

In the link monitor, I set AT+CEREG=5 and then AT+CEREG? to view the parameters provided by the network.

It is not the same as I had configured in the config file.

[/quote]

You are allowed to enter PSM, and you are getting these back:

Active time: 00011110 (GPRS Timer 2: 000 = 2 sec, 11110 = 30, 2 * 30 = 60 sec)

Periodic TAU: 00000110 (GPRS Timer 3: 000 = 10 minutes, 00110 = 6, 10 min * 6 = 1 hour)

You can see the specific bitmasks for the two timers shown here:

https://devzone.nordicsemi.com/f/nordic-q-a/54538/turn-off-active-time-and-go-directly-to-power-save-mode/220898#220898

Note that you can ask for a specific interval, but the actual PSM intervals are ultimately determined by the network.

Kind regards,

Håkon

RE: Enabling eDRX or PSM Mode with iot.1nce.net sim

Adeel — Fri, 13 Nov 2020 16:47:15 GMT

Hi Hakon,

I tried the PSM config by adding:

CONFIG_LTE_PSM_REQ_RPTAU="10101010" // 10 mins
CONFIG_LTE_PSM_REQ_RAT="00100001" // 1 min

in the prj.conf file.

In the link monitor, I set AT+CEREG=5 and then AT+CEREG? to view the parameters provided by the network.

It is not the same as I had configured in the config file.

Does it mean that PSM is not supported (or) does the network not support the values provided by me.

I am basically trying to have a PSM mode of 10 mins and an active window of 1 minute.

Regards,

Adeel.

RE: Enabling eDRX or PSM Mode with iot.1nce.net sim

Håkon Alseth — Fri, 13 Nov 2020 12:53:46 GMT

Hi Adeel,

As you mention, it might be that the network doesn't allow roaming sim cards to enter eDRX/PSM modes.

You could try contacting Telekom and ask if they plan to open these features for roaming SIMs.

Have you checked if you get PSM?

Kind regards,

Håkon