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Use systemd on-hardware activation

Submitted by Aleksander Morgado

Assigned to ModemManager bug user

Link to original bug (#85009)

Description

Originally reported at: https://bugzilla.gnome.org/show_bug.cgi?id=703039

ModemManager could be configured to be started automatically whenever a possible port to probe is detected in the system. This could be achieved by setting up rules in systemd to launch MM whenever ports with e.g. a special tag (like our ID_MM_CANDIDATE) are found.

ModemManager would still allow DBus activation, though. E.g. if a explicit Scan() is requested via DBus.

In both those cases, MM could exit after some period without any device found to manage.

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