With the modem's radio off (airplane mode) the bring-up waited five
minutes for registration and then tried to connect the ims bearer
anyway. That attempt fails with no-service and leaves ModemManager's
modem state `enabled` while the modem stays in low power; switching the
radio back on then no longer brings the modem up, and the phone has no
mobile service until the modem is disabled and enabled again (dev phone
2026-10-06: not registered 150 s after the radio came on, against 5 s
without the attempt).
0.3.9's bring-up made the same attempts, but it only ran at boot or at
a manual restart. Since this series a registered imsd exits when its
address leaves the netdev and systemd runs the bring-up again, and an
upgrade restarts it: the bring-up now also runs during a radio-off
period.
A modem still disabled after the registration wait, or disabled when a
connect attempt is due, now makes the script exit non-zero without
touching the modem; systemd retries after RestartSec.
Tested on the dev phone (KPN) with this script: a registered imsd, the
radio switched off — imsd exited at its next refresh, the bring-up gave
up after the wait with the modem still disabled, and when the radio came
back the modem registered in 5 s and imsd registered by itself two
minutes later; the same with an upgrade's restart during the radio-off
period. The twelve mock scenarios of the bring-up are unchanged.
Jorijn van der Graaf
7d38846bb6