[Android] Make message syncronization interface capable of handling future changes
Summary:
Update packet type with proper field names and commenting
Send new "event" field
Test Plan:
- Install corresponding Desktop-side patch D16599
- Verify that it is still possible to synchronize messages the same as it was before
Reviewers: KDE Connect, nicolasfella
Reviewed By: KDE Connect, nicolasfella
Subscribers: nicolasfella, kdeconnect
Tags: KDE Connect
Differential Revision: https://phabricator.kde.org/D16600