Ensuring Proper Initialization of the Network Stack in Zephyr for TCP Client Application

[ofirsheruni]

Hello,

I'm currently running a TCP client on Zephyr, which connects endlessly to a remote server. The process involves establishing a TCP session, sending a message, closing the session, and then repeating the cycle. However, during the very first attempt to establish a TCP session, I encounter an error stating that the connect() function failed, with the errno returned being -116, representing -ENETDOWN. Only after the first try, do I see logs from the OS indicating that the network stack has initialized:

<inf> net_config: Initializing network
<inf> net_config: IPv4 address: 192.0.2.1

It seems like that the first connect() attempt occurs before the interface is up, but from the second try everything runs smoothly.

How can I ensure that Zephyr finishes initializing the network stack and configuring the interface before it proceeds to execute applications in the APPLICATION initialization level?

I also tried to use CONFIG_NET_CONFIG_INIT_TIMEOUT=0, but it didn't resolve the problem.

Thank you in advance,
Ofir.