https://developer.apple.com/documentation/Xcode/configuring-app-groups

I use IPC notification(CFNotificationCenterPostNotification) and NSNotificationCenter to notify, then use App Group to share data between app and extension.

APPGroups could help.

this api is @available(iOS 17.0, tvOS 17.0, macOS 14.0, watchOS 10.0, *) public func containerBackground

Thx However, CSA repo: https://github.com/project-chip/connectedhomeip can support above from 15.4.

Could you please share the implementation that how you receive silent push notification in widget extension and the test payload?

Could you share your implementation that how to use a silent push notification in widget extension?