Commissioning fails when VPN is enabled

[franmontiel]

Issue Description:

When a VPN is configured on the user’s device, the commissioning process fails consistently (100% of the time).

During the commissioning process, the screen displays “Checking network connectivity to .” After a few minutes, the message “Can’t reach device” is shown.

Root Cause (Suspected):

The issue seems to occur after the Bluetooth-based data exchange phase. Once this phase is completed, the commissioning process appears unable to communicate with the Matter device over the local area network (LAN).

Additional Context:

The LAN itself should be accessible. For instance, I can still successfully communicate with my Thread Border Router, which suggests the issue is specific to how the communication is managed by the Google Home Mobile SDK and/or connectedhomeip library used by it.