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wwan: Ensure we get existing objects on reset

Cédric Bellegarde requested to merge gnumdk/NetworkManager:main into main

Summary

When ModemManager become available, NetworkManager resets GDBusObjectManagerClient object.

But there is a race condition if object-added is emitted before modm_ensure_manager(), we need to check existing objects if we want to be in sync with ModemManager.

Purpose

Droidian is using ofono2mm as a gate between NetworkManager and OFono. On Miatoll devices, race condition occurs quite often with /ril_0 unconfigured (NetworkManager does not know the modem exists).

Checklist

Please read https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/CONTRIBUTING.md before opening the merge request. In particular, check that:

  • the subject for all commits is concise and explicative
  • the message for all commits explains the reason for the change
  • the source is properly formatted
  • any relevant documentation is up to date
  • you have added unit tests if applicable
  • the NEWS file is updated when the change deserves to be mentioned, for example for new features, behavior changes, API deprecations, etc.

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