OTBR: Abort firmware flasher if network device is selected.

[tl-sl]

This is a bit of a corner case, as it would require a supported device connected and it also be selected in the otbr addon (but of course it has happened!)

If network device is selected, then we shouldn't run the flasher against that USB device. The device setting should be ignored if network device is set.

Summary by CodeRabbit

• New Features

  • Introduced a safeguard in the firmware flashing process that aborts the operation if a network device is selected, enhancing user safety.

• Version Update

  • Version incremented from 2.9.0 to 2.9.1, reflecting a minor release with improvements and updates.

[coderabbitai]

Walkthrough

Walkthrough

The update from version 2.9.0 to 2.9.1 of the OpenThread Border Router introduces improved safety measures in the firmware flashing process. Now, the firmware flasher will abort if a network device is selected, preventing accidental flashing during active use. This change enhances operational integrity, particularly in scenarios involving network devices, while maintaining the functionality introduced in the previous version.

Changes

Files	Change Summary
openthread_border_router/CHANGELOG.md	Updated changelog for version 2.9.1, highlighting the new requirement to abort firmware flashing if a network device is selected.
openthread_border_router/config.yaml	Incremented version number from 2.9.0 to 2.9.1, indicating a minor release with no other structural changes.
openthread_border_router/rootfs/etc/s6-overlay/scripts/universal-silabs-flasher-up	Introduced a conditional check to prevent firmware flashing if a network device is selected, enhancing the script's functionality while retaining existing logic.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant FlasherScript
    participant NetworkDevice

    User->>FlasherScript: Initiate firmware flashing
    FlasherScript->>FlasherScript: Check for network_device
    alt Network device selected
        FlasherScript->>User: Log message and exit
    else No network device
        FlasherScript->>FlasherScript: Proceed with firmware flashing
    end

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