Reconnecting GSM profile after a long period of no signal

I am running NetworkManager 1.12.0 on an embedded Linux device that has Ethernet, Wi-Fi, and cellular.  I am seeing a connection issue on GSM profiles that are setup for autoconnect=true.  If I am able to establish a connection on cellular, then lose signal (move out of range) for 20-60 minutes, and then come back within range of the cellular signal, NetworkManager will not attempt to reconnect to these networks.  I can see that ModemManager (version 1.8.0) is fully registered with the cellular network and that NetworkManager is just not requesting to connect a data session.


I know NetworkManager has a 300 second autoconnect reset retry timer.  I modified that timeout to be 60 seconds to make NetworkManager more aggressive on retry attempts. I have given NetworkManager over an hour and have seen no attempt to connect to the cellular network after a long period of no signal.  A simple “nmcli con up <PROFILE>” command will instantly connect when run, but I want NetworkManager to automatically connect without user intervention on the command line.


I believe I had someone explain before that this is based on the logic of a connection that is having issues with getting data is eventually assumed to be a bad connection after enough failed attempts and that knowledge is somehow stored somewhere so NetworkManager doesn’t try to connect to that network again.  In my case I have an embedded device that is attached to mobile assets so the cell and Wi-Fi signal will come and go, the whole time the device is never turned off.


I have also seen this issue with Wi-Fi previously, but I am not sure if that is the same issue I am seeing now with cellular.


Is there some way to force NetworkManager to always keep retrying to connect to networks defined in profiles that have autoconnect set to true until successfully connected, no matter how many times it fails to connect?


Best regards,

Matthew Starr


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