Cellular sample fails to bring back L4 connection after modem restart

[olalonde]

Describe the bug

After running the cellular sample, I am getting "L4 was not connected in time" after the modem restarts.

To Reproduce

Run the cellular sample.

Expected behavior

L4 should connect again after the modem is restarted.

Logs and console output

I tested with a new driver (a76xx). I tested both with and without a shutdown script.

https://gist.github.com/olalonde/17f56d92015cb9b08371209fb2ebb761#file-modem_cellular_a76xx_shutdown_script-log-L4999

https://gist.github.com/olalonde/2cd36af3502571906fa453942920f050#file-cellular_modem_a76xx-log-L5010

I doubt it's a bug with my driver as it's just a small modification of the existing simcom 7080 driver and it works fine up until the modem is restarted. The init chat script and dial chat scripts complete successfully. The issue is that afterwards nothing happens, whereas the PPP driver should be initiating a new session.

Can anyone try to run the cellular sample and see if L4 connects after the modem restarts?

Environment (please complete the following information):

• OS: macos
• Toolchain: west
• Commit SHA or Version used: 2fc54ae

[olalonde]

I was able to fix this issue in this commit: 8628eb6

I am not 100% sure if it's correct but it fixes this issue.