RAI feature with LTE-M and MQTT

[Frikkie Badenhorst]

Hi there,

We are currently conducting tests on the nRF9160 using the LTE Serial Modem app. We do however have issues testing the RAI feature on the device with an LTE-M network. The network does indeed support the RAI feature, as we have been able to test this using different devices.

According to the AT commands reference manual, the %XRAI command is not supported in a LTE-M network? Is that indeed the case?

We then refer to the %RAI (8.17 in AT commands reference manual) and %REL14FEAT (8.18). However, we are not able to use any of these 2 features? We continuously get the "ERROR" response when trying to active the REL 14 features. We have set CFUN to 0,1 and 4 to attempt this. 

Can you please assist with instructions on how to enable this feature on a LTE-M network so that we can test it? 

This is very urgent as we need to decide on which hardware we will use in our product today/Monday.

[Albrecht Markus Schellenberger]

Hello Frikkie,

Can you please assist with instructions on how to enable this feature on a LTE-M network so that we can test it? 

 The AT commands %REL14FEAT and %RAI are not supported with mfw 1.2.3, hence there will be an ERROR response with that release.

According to the AT commands reference manual, the %XRAI command is not supported in a LTE-M network? Is that indeed the case?

The old %XRAI command is only for Control Plane (data) RAI and control plane data is only supported in NB-IoT (whole industry, not just our product). In mfw1.3.0 %RAI will enable support for both CP RAI and AS RAI and then the application will need to give release assistance information via a socket interface to the modem.

Regards,

Markus

[Frikkie Badenhorst]

Hi Markus, 

Thanks for the information. We are able to use %REL14FEAT and %RAI command n the 1.3.0 firmware. Do you perhaps have an application note/instructions on how to use and test this feature - more specifically how to give the release assistance information via a socket interface to the modem?

Will this requires writing application code? If so, we are currently having issues installing the SDK and SES, and will put time into fixing that when we are sure that we will use the nRF9160 (which at this stage is very likely based on what we are seeing from our testing), so we were provided with a hex file to test. Thus if it is needed to change application code, can you kindly provide the hex file so that we can test it?

We are currently using the LTE Serial Modem application provided by Stian Røed Hafskjoldhere  https://devzone.nordicsemi.com/f/nordic-q-a/76896/rerouting-at-interface-for-power-measurement-using-external-supply 

Thanks in advance!