Hello:
I am working on an application that uses a simple UDP socket for transmitting data. I would like understand the zephyr BSD socket behavior when there are cellular connects/disconnects.
1.) I my application I create a socket and then send data once a minute. If I detect that the cellular connection has disconnected, do I need to explicitly call close() and then call another open() and connect()?
In my current test firmware, I noticed that sometimes a call to close() on an existing socket when there is no cellular connection will cause the NRF9160 to enter a weird state. In my case, the zephyr shell thread kept working by the main thread which had the networking call appeared to be sleep/idle state forever after the close was called.
2.) I created a simple test application where I could close() on an invalid/unused socket and could get the exact behavior from #1.
For applications where I want to use UDP, what is the correct order of operations when I detect a cellular connection is dropped? I am trying to ensure that I can gracefully recover in this situation.
