RE: nRF9160 switch between LTE-M and Ethernet

GilDev — Fri, 02 Feb 2024 13:20:14 GMT

Hi,

Have you had any success with this? It seems like Zephyr has a socket dispatcher system that could help. I’m currently trying to achieve the same thing as you.

RE: nRF9160 switch between LTE-M and Ethernet

Håkon Alseth — Tue, 22 Sep 2020 12:54:34 GMT

Hi,

[quote user=""]I am a little confused what the CONFIG_NET_SOCKETS_OFFLOAD does exactly, but I believe this disables the option to switch the interfaces at runtime, because the socket data is not going through the Zephyr stack, but instead is forwarded straight to the LTE-M modem.[/quote]

This offloads the NET stack, specifically wrt. to socket calls (send/recv/socket/poll etc). In the case of nRF9160, it routes the nrf_socket calls to zephyr's API, which is done in the nrf91_sockets.c file:

https://github.com/nrfconnect/sdk-nrf/blob/master/lib/bsdlib/nrf91_sockets.c

[quote user=""]Is this correct? How can we accomplish choosing which network interface (LTE-M vs. Ethernet) to use at run-time, when creating sockets?[/quote]

I'm not sure its currently possible. But, didn't you ask this specific question in this thread as well? https://devzone.nordicsemi.com/f/nordic-q-a/65943/socket-manager

It isn't currently easy/possible to dynamically switch between two socket implementations as of now. If you ask in the zephyr mailing-list (or on their slack), you might get a bit more in-depth answer, as the developers there might have future insight on what is planned.

Kind regards,

Håkon