LwM2M Carrier Library Questions

RE: LwM2M Carrier Library Questions

Håkon Alseth — Mon, 22 Jun 2020 15:23:11 GMT

Hi,

[quote user="AkashPatel"]What will happen if I have the lwm2m carrier library as part of my project and I use an MVNO sim? If it cannot connect to the carrier, then will it hang or timeout? If timeout, after how long?[/quote]

Nothing should happen, as it does not block anything in the application. the event _READY from LWM2M will never come, and the application shall run as normal.

Kind regards,

Håkon

RE: LwM2M Carrier Library Questions

Akash Patel — Sat, 20 Jun 2020 00:19:02 GMT

[quote userid="2115" url="~/f/nordic-q-a/62774/lwm2m-carrier-library-questions/255978"]

Roaming SIMs will not access a carrier lwm2m server, so then its not needed.

[/quote]

What will happen if I have the lwm2m carrier library as part of my project and I use an MVNO sim? If it cannot connect to the carrier, then will it hang or timeout? If timeout, after how long?

RE: LwM2M Carrier Library Questions

Håkon Alseth — Fri, 19 Jun 2020 13:18:01 GMT

Hi Akash,

[quote user=""]If I am in an area with no LTE coverage, what will happen in this case? How long will I have to wait for the Carrier Library to give the semaphore if there is no coverage? When should I run the portion of my application that does not need LTE Connection, e.g. talking to other devices over UART.[/quote]

Most of the abstractions in lwm2m can be found in the lwm2m_os.c file, which in this case will call upon the lte_lc library:

https://github.com/nrfconnect/sdk-nrf/blob/v1.3.0/lib/bin/lwm2m_carrier/os/lwm2m_os.c#L626-L641

So, it depends on how you have configured that to run (see CONFIG_LTE_NETWORK_TIMEOUT).

Given that your own logic is running in an already running thread, it should run as expected.

[quote user=""]I need to use a different APN in my application. When should I initialize that? Should I put the modem in flight mode (AT+CFUN=4) after getting the LWM2M_CARRIER_EVENT_READY event and then reconfigure the APN and then turn the modem on again? If I do that, do I need to reconnect to the lwm2m operator network?[/quote]

You can set the APN using this kconfig:

https://github.com/nrfconnect/sdk-nrf/blob/master/lib/lte_link_control/Kconfig#L97

Then lte_lc library will set it on boot up.

[quote user=""]If I am planning to use an MVNO SIM in my product (such as iBasis), do I need to include the LwM2M Carrier Library? Let's say I am deploying my product in the US and it is connecting to either Verizon or AT&T through the MVNO, will the carrier library be able to connect directly to the carrier.[/quote]

Roaming SIMs will not access a carrier lwm2m server, so then its not needed.

Kind regards,

Håkon