RE: Multiple network interfaces, socket problem

Albrecht Markus Schellenberger — Thu, 28 Oct 2021 06:23:49 GMT

Hello Joris,

[quote user=""]I was trying to open a socket (that uses the Wifi chip) and connect to it:[/quote]

This is a tricky one, actually. In general, if nRF91 socket offloading is enabled it takes over all of the socket() calls with default parameters.

[quote user=""]I tried to debug it, and I noticed that the wrong network interface is chosen, with the consequence that the offload functions are not called. I guess that it's a configuration issue, but until now no luck to find it...[/quote]

We have recently introduced a new flag on master branch, SOCK_NATIVE. It can be used when creating a socket to indicate that the intention is to create a socket for the native networking stack and not the nRF91 offloaded one.

You could try to create a socket like this:

socket(AF_INET, SOCK_STREAM | SOCK_NATIVE, IPPROTO_TCP)

The socket call should be redirected to the native stack instead, since the ESP8266 is using a different offload mechanism (NET_OFFLOAD) which falls under "native stack". We have not tested with such a setup though, so we can not give a 100% guarantee that it works.

Regards,

Markus