Re: Autoconnect backoff

On Wed, Jul 6, 2022 at 10:03 AM Sven Schwermer via networkmanager-list <networkmanager-list gnome org> wrote:

I have a device with cellular modem running a Linux-based OS with
ModemManager/NetworkManager used for the connectivity management.
Occasionally, the cellular connection breaks and it takes several
connection attempts until the connection can be established again.
Currently, we have autoconnect-retries=0 for our cellular connection so
there are infinite retries. This, however, can cause significant system
load if the ModemManager connect (dbus) calls fail immediately which
occasionally happens.

As far as I understand, NetworkManager will attempt a new autoconnection
attempt right away after the previous attempt failed. The only way of
slowing this down is to set autoconnect-retries=1 which will cause
NetworkManager to wait for 5 minutes between attempts. This wait
duration seems to be fixed.

Is there a way to make NetworkManager perform a backoff (e.g. linear or
exponential) between connection attempts? Are there any other ways to
guarantee that the cellular modem is "always connected" without having
NetworkManager to loop like crazy when a (re-)connection attempt fails?

Thanks and best regards,

Sounds like a device that is going to be remotely controlled over LTE / GSM / CDMA..  If it is unreachable, what does it matter until it comes back up?  You will not get to it anyhow :)

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