Does not notice when a modem goes away
when toggling of the kill switch the modem stays visible in ModemManager:
$ mmcli -L
/org/freedesktop/ModemManager1/Modem/1 [manufacturer unknown] model unknownwhen doing a mmcli -r -m 0 it correctly vanishes. I don't think MM has a way to correctly notice this except for polling (and we certainly don't want it to wake up a suspended modem) so i'm not yet sure what's the best thing to do here.