Aws fota sample and psm

[Fabien Comte]

Hello,

I want to use PSM with aws fota sample. Do the mqtt level is compatible ?

How to activate psm and check if it s enabled ?

Thank you

[Håkon Alseth]

Hi,

 

 

I want to use PSM with aws fota sample. Do the mqtt level is compatible ?

 MQTT QoS level is a protocol feature, and will require a longer sequence for ACKing a message, as described here: https://www.hivemq.com/blog/mqtt-essentials-part-6-mqtt-quality-of-service-levels/

This shouldn't interfere with your PSM, unless the active time is very low.

 

 

How to activate psm and check if it s enabled ?

 You can request it via this call: https://github.com/NordicPlayground/fw-nrfconnect-nrf/blob/master/lib/lte_link_control/lte_lc.c#L349

This is essentially the AT+CPSMS command.

To check the interval you have dynamically received from the cell tower, you should issue a AT+CEREG=5 and query AT+CEREG?

The last two bit masks will then give a status on the PSM.

If your repo is updated, you can use this function to fetch the intervals: https://github.com/NordicPlayground/fw-nrfconnect-nrf/blob/master/lib/lte_link_control/lte_lc.c#L359

 

Kind regards,

Håkon

[Fabien Comte]

Hello,

Thank you for your help.